TW201909863A - Absorbent article - Google Patents

Abstract

The present invention provides an absorbent article capable of causing less discomfort to a wearer and being less likely to give rise to skin conditions such as bedsores or rashes. This absorbent article comprises a surface sheet (5) and an absorber (6) and has a longitudinal direction, a width direction, and a thickness direction. The absorbent article further comprises: a low friction member (14) disposed on a skin-facing side of the surface sheet (5) at least in a rear region (4), and having a plurality of openings (16) that penetrate the absorbent article in the thickness direction; and a cover sheet (13) disposed on the skin-facing side of the low friction member (14). Furthermore, each of the plurality of openings (16) are specifically configured so as to have an opening periphery portion (17) disposed on the skin-facing side and a rib portion (18) protruding toward the non-skin-facing side from the opening periphery portion (17).

Description

Absorbent article

The present invention relates to absorbent articles such as urine-absorbing pads and disposable diapers, and more particularly to absorbent articles that do not easily cause skin diseases such as bedsores and rashes on the skin of the wearer.

In recent years, various absorbent articles such as urine absorbent pads and disposable diapers have been reviewed for various countermeasures to improve skin disorders such as bedsores, rashes (dermatitis), and the like on the skin of the wearer. .

As such an absorbent article, for example, Patent Document 1 discloses a disposable urine absorption pad having a decubitus prevention function, which includes an outer sheet, an absorbent body provided on the body side of the outer sheet, and The inner sheet on the body side of the absorbent body, the left sheet provided on the left side of the absorbent pad, the right sheet provided on the right side of the absorbent pad, the overlap sheet provided on the hip region, and the overlap sheet and the inner surface A low-friction member having openings between the sheets, and the right and left edges of the overlapping sheets are joined to the left part of the right sheet and the right part of the left sheet, respectively. The disposable urine absorbent pad disclosed in this Patent Document 1 can be manufactured at low cost, and the overlapping sheet is relatively easy to move in the front-rear direction with respect to the inner sheet. Therefore, it has the function of preventing the occurrence and deterioration of bedsores. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 2014-155609

[Problems to be Solved by the Invention]

However, if the absorbent article disclosed in Patent Document 1 is provided with a liquid-impermeable low-friction member on the body side (skin-facing surface side) of the inner sheet (surface sheet), the non-skin pair located on the surface sheet When excretion fluid such as urine absorbed by the surface-side absorbent body is released from the absorbent body due to evaporation or the like, the liquid-impermeable low-friction member (more specifically, the low-friction member) is released. The part covered by the part other than the openings) hinders the discharge of the aforementioned moisture. Therefore, the humidity may cause the wearer to feel uncomfortable due to the wet state and the sultry state. In addition, if an opening is formed in the low-friction member, when excretion fluid such as urine absorbed in the absorber returns to the skin-opposing surface side, the excretion liquid will easily pass through the opening of the low-friction member toward the skin. Moving to the face side, the wearer's skin will be wetted by the excretion fluid, which may cause the wearer to feel uncomfortable. In addition, if the wearer's skin (skin) is kept wet with excreta such as urine and moisture, the wearer's skin will swell, making it difficult to maintain chemical irritation and physical properties. Resistance to irritation, etc. (that is, the skin's defense function against various irritation is reduced), and if the skin in such a swollen state is changed to alkaline by the ammonia component of excretion fluid from urine, etc. (that is, it is chemically affected Irritation), or physical irritation due to friction, deflection, etc. on the surface sheet, the skin cannot withstand such irritation, and may cause skin disorders such as bedsores, rashes (dermatitis). In addition, such a skin disorder is particularly likely to occur near the hips of the wearer (specifically, near the sacrum) because the wearer has many opportunities to sleep on his back.

Therefore, an object of the present invention is to provide an absorbent article which is less likely to cause discomfort to the wearer, and does not easily cause skin diseases such as bedsores and rashes. [Means to solve the problem]

An aspect (Aspect 1) of the present invention is an absorbent article, which is provided with a surface sheet and an absorbent body located on the non-skin facing surface side of the surface sheet, and has a length direction, a width direction, and a thickness direction. It is: The absorbent article has a belly region, a back region, and a crotch region located between the two regions in a plan view, and 至少 the absorbent article is at least in the back region and has: A low-friction member located on the skin facing surface side of the surface sheet and having a plurality of openings penetrating in the thickness direction; and a cover sheet located on the skin facing surface side of the low-friction member, 开口 the plurality of openings, respectively It has an opening peripheral edge portion located on the skin facing surface side, and a rib portion protruding from the opening peripheral edge portion toward the non-skin facing surface side.

The absorbent article of this aspect 1 includes a low-friction member on the skin-facing side of the surface sheet in the back region corresponding to the buttocks of a wearer who is prone to skin disorders such as bedsores, rashes, and the like. The cover sheet that is directly in contact with the wearer's skin (specifically, the skin of the buttocks). Therefore, a low friction member is interposed between the cover sheet and the surface sheet to reduce friction resistance. The facing sheet is relatively easy to move in the face direction. Accordingly, even if the absorbent article of the aspect 1 is moved during wearing, the covering sheet can move with the wearer's skin in a face-to-face direction in accordance with the wearer's movement. It is difficult for the user's skin to apply physical irritation caused by friction and displacement. Moreover, in the absorbent article of this aspect 1, since the said low-friction member has a plurality of opening portions each having a rib portion protruding from the opening peripheral portion toward the non-skin-facing surface side, the rib portion serves as the low-friction member and the surface. The spacer between the sheets functions to form a space portion as a ventilation path between the low-friction member and the surface sheet, which can discharge moisture caused by the aforementioned excretion fluid such as urine. As a result, the absorbent article according to the aspect 1 does not easily contact the skin of the wearer due to the excretion fluid such as urine and moisture flowing back toward the skin-facing side, so it is difficult for the wearer to feel moist. Or a stuffy state, or the skin (skin) of the wearer is kept in a wet state (that is, the skin of the wearer is swollen). As described above, the absorbent article of this aspect 1 is not easy to cause discomfort to the wearer, and it is not easy to cause skin diseases such as bedsores and rashes.

In this specification, the [excretion] of the object absorbed by the absorbent article is not particularly limited as long as it is capable of being absorbed and held by an absorbent described later, and includes, for example, urine, sweat, and blood. In addition to liquids, low viscosity substances such as soft stools are also included.

In another aspect (Aspect 2) of the present invention, as in the absorbent article of Aspect 1, the ribs are a product of a height (h _r ) and a thickness (t _r ) of the ribs of 2.0. × 10 ^-3 mm ² to 5.0 × 10 ^-3 mm ² .

The absorbent article of this aspect 2 is formed by a product of a height (h _r ) and a thickness (t _r ) having a height of the ribs of 2.0 × 10 ^-3 mm ² to 5.0 × 10 ^-3 mm ² Specific structure within the range of the thickness, the ribs are not easily crushed in the thickness direction even when a force such as the body pressure of the wearer is applied in the thickness direction of the absorbent article, and low friction can be maintained. The low-friction property of the member (that is, a state in which the frictional resistance between the cover sheet and the low-friction member is small) can more stably function as a spacer between the low-friction member and the surface sheet. As a result, the absorbent article of the second aspect is not only difficult to apply physical irritation caused by friction, shifting force, etc. to the skin of the wearer, but also excretions such as reflux urine and moisture are more difficult. It is in contact with the skin of the wearer, and therefore, it is possible to more easily and stably exert the effect of preventing the wearer from feeling uncomfortable and easily causing skin diseases such as bedsores and rashes.

In another aspect (Aspect 3) of the present invention, the absorbent article according to Aspect 1 or 2, wherein the skin facing surface of the opening peripheral portion is curved toward the non-skin facing surface side.

In the absorbent article of this aspect 3, since the skin facing surface of the opening peripheral portion is bent toward the non-skin facing surface side in the opening portion of the low-friction member, the force applied to the surface direction can be stronger. Even if the rib portion is crushed in the thickness direction, the curved peripheral edge portion can act like a leaf spring and easily restore the rib portion. As a result, the space portion can be formed more reliably and continuously. In addition, since the skin-facing surface of the opening peripheral portion is bent toward the non-skin-facing surface side, the opening peripheral portion is not easily hooked on the cover sheet (especially the cover sheet moving in the face direction), which can reduce the cover sheet to a lower level. The frictional resistance between the friction members is further reduced. Therefore, the absorbent article of the aspect 3 can more reliably and continuously exert the effect of the absorbent article of the aspect 1 or the aspect 2.

In another aspect of the present invention (Aspect 4), the absorbent article according to any one of Aspects 1 to 3, wherein the rigidity of the end portion of the rib portion that is located on the non-skin facing surface side is The rigidity is higher than the peripheral edge portion of the opening.

In the absorbent article of this aspect 4, since the rigidity of the front end portion of the rib in the opening portion of the low-friction member is higher than that of the peripheral edge portion of the opening, the rib portion is not easily deformed. Therefore, even if a force is applied to the thickness direction and In the case of the surface direction, the space portion can be more reliably formed between the low-friction member and the surface sheet.

In another aspect of the present invention (Aspect 5), the absorbent article according to any one of Aspects 1 to 4, wherein the front end portion of the rib portion located on the non-skin-facing surface side is located in the foregoing portion. The interior of the surface sheet.

The absorbent article of this aspect 5 has a structure in which the front end portion of the rib portion is located inside the surface sheet (that is, the structure in which the front end portion of the rib portion enters the inside of the surface sheet) due to the opening portion of the low-friction member. Therefore, with the effect of the fixture of this structure, the rib portion becomes difficult to move or deform, and the aforementioned space portion can be formed more stably and reliably.

In another aspect (Aspect 6) of the present invention, the absorbent article according to any one of Aspects 1 to 5, wherein the surface sheet has a concavo-convex structure that is to be applied to the absorbent article. A convex portion that protrudes toward the skin facing surface side in the thickness direction and continuously extends in a predetermined first direction, and a convex portion that is recessed in the thickness direction toward the non-skin facing surface side and continuously extends in the first direction The groove portions are alternately arranged along a second direction orthogonal to the first direction.

Since the absorbent article of this aspect 6 has the specific uneven structure which has the said convex part and the said groove part, in addition to the rib part of the said low friction member, the convex part of the surface sheet can also be used as a low friction member. The spacer to the surface sheet functions, and the space portion can be more surely secured. In addition, since the absorbent article according to the aspect 6 has the groove portion on the surface sheet, the low-friction member can be separated from the surface sheet more greatly (that is, the cross-sectional area of the space portion in the thickness direction can be more ensured). Therefore, it is difficult for the excretion fluid such as urine and moisture absorbed by the absorbent body to reach the skin-facing surface side of the low-friction member (that is, it is not easy to contact the skin of the wearer), and it is further difficult to produce When the wearer feels wet, sultry, etc., or when the wearer's skin is wet.

In another aspect of the present invention (Aspect 7), as in the absorbent article of Aspect 6, the front end portion of the rib portion located on the non-skin-facing surface side is in the thickness direction and is in contact with the convex portion. Sections are repeated.

In the absorbent article of this aspect 7, since the front end portion of the rib portion of the low-friction member overlaps with the convex portion of the surface sheet in the thickness direction, the low-friction member and the surface sheet can be separated more widely. Excretion fluid such as urine and moisture absorbed by the absorber are less likely to reach the skin-facing side of the low-friction member. Thereby, the absorbent article of this aspect 7 can exhibit the effect of the absorbent article of said aspect 6 more effectively and reliably.

In another aspect (Aspect 8) of the present invention, the absorbent article according to Aspect 6, wherein the front end portion of the rib portion on the non-skin-facing surface side is in the thickness direction and is concave with the concave portion. The groove is repeated.

In the absorbent article of this aspect 8, since the front end portion of the rib portion of the low-friction member overlaps with the groove portion of the surface sheet in the thickness direction, movement in the surface direction of the rib portion can be restricted by the groove portion of the surface sheet. , The space portion formed between the low-friction member and the surface sheet can be more stably and surely secured.

In another aspect (Aspect 9) of the present invention, the absorbent article according to any one of Aspects 1 to 8, wherein the absorbent article is further provided between the surface sheet and the absorbent body. The absorptive sheet containing a high absorptive polymer, wherein the absorptive sheet is in the thickness direction and is the same as the low-friction member.

The absorbent article of this aspect 9 further includes an absorbent polymer containing a highly absorbent polymer between the surface sheet and the absorbent body at a position overlapping with the low friction member in the thickness direction. An absorbent sheet (more specifically, a superabsorbent polymer contained in an absorbent sheet) swells when it absorbs urine, such as urine. Therefore, the surface sheet is directed toward the skin by swelling of the absorbent sheet. Pushing to the surface side makes it easy to form a state where the front end portion of the rib portion of the low-friction member enters the inside of the surface sheet. Thereby, the absorbent article of this aspect 9 can prevent the rib portion of the low-friction member from being easily moved or deformed even after absorbing the excretion liquid such as urine, and can form the aforementioned space portion more stably and reliably. Moreover, the absorbent article of this aspect 9 can exhibit more excellent absorption performance by having the said absorbent sheet.

In another aspect of the present invention (Aspect 10), the absorbent article according to any one of Aspects 1 to 9, wherein the absorption system includes an upper absorbent layer located on the side facing the skin and a non- The upper absorption layer has a lower absorption layer on the skin facing side, and the upper absorption layer is provided in the crotch region and extends in the longitudinal direction and penetrates the upper absorption layer in the thickness direction. The angle formed by each wall surface of the one side end portion and the other side end portion in the width direction and the imaginary bottom surface of the upper groove portion is greater than that of the wall surfaces of the belly side end portion and the back side end portion in the longitudinal direction. The angle formed by the imaginary bottom surface of the aforementioned upper groove portion is closer to vertical.

The absorbent article of this aspect 10 has an upper absorbent layer and a lower absorbent layer, and the upper absorbent layer has an upper groove portion having the specific structure in the crotch region, and therefore is discharged from the wearer. Excretion such as urine becomes easier to reach the lower absorption layer through the upper groove portion, and even when the excretion liquid temporarily accumulates in the upper groove portion, the excretion liquid can be preferentially diffused in the longitudinal direction. With this, the absorbent article according to the aspect 10 can not only efficiently absorb urine and other excretion liquids over a wide area of the absorbent body, but also the upper absorbent layer through the middle, so that the absorbent article absorbed by the lower absorbent layer can be absorbed. The excretory fluid is not easy to flow back. Therefore, the excretory fluid such as urine and its moisture are not easy to contact the wearer's skin, and it is more difficult for the wearer to feel a wet, sultry state, or a wearer's skin. Wet state.

In another aspect (Aspect 11) of the present invention, the absorbent article according to any one of Aspects 1 to 10, wherein the low-friction member is formed by a high-density polymer containing a proportion of 50% by mass or more. It is formed by a sheet-like member made of ethylene resin.

Since the absorbent article of this aspect 11 is formed of a resin sheet-like member containing high-density polyethylene at a ratio of 50% by mass or more, the low-friction member is formed to have a hardness of a certain value or more. In addition, a member having a small friction resistance can make the ribs formed on the low-friction member less likely to be crushed in the thickness direction, and can ensure the low-friction property of the low-friction member in a wider range. Thereby, the absorbent article of this aspect 11 can more stably perform the function of the rib as a spacer between the low-friction member and the surface sheet, and as a result, it is difficult to apply friction and displacement to the skin of the wearer. The physical irritation caused by force, etc., and the excreted fluid such as the returning urine, its moisture, etc., are less likely to contact the skin of the wearer.

In another aspect (Aspect 12) of the present invention, the absorbent article according to Aspect 11, wherein the resin-made sheet-like member contains a mass ratio in a range of 50/50 to 75/25, which is the high density. Polyethylene and low density polyethylene.

Since the absorptive article of this aspect 12 has a low-friction member, the sheet-like member made of resin contains high-density polyethylene and low-density polyethylene with a mass ratio in the range of 50/50 to 75/25. Low-density polyethylene can reduce the stress (ie, internal residual stress) remaining inside the sheet-like member when the sheet-like member is formed of a resin material, when the sheet-like member forms an opening, and the like, and can suppress the aforementioned The sheet-like member (particularly, the widthwise end portion of the sheet-like member) is rounded (ie, curled) due to relaxation of internal residual stress. Thereby, the cover sheet can move more smoothly on the low-friction member, so that it is more difficult to apply physical stimuli caused by friction, shifting force, and the like to the skin of the wearer.

In another aspect (Aspect 13) of the present invention, the absorbent article according to any one of Aspects 1 to 12, wherein the measured value of the surface sheet and the low-friction member through a probe adhesion test is A low-adhesive adhesive of 0.78N or less is bonded at least partially.

Since the absorbent article of this aspect 13 is at least partially bonded to the surface sheet and the low-friction member through a probe adhesion test and has a low-adhesive adhesive value of 0.78N or less, the low-adhesive adhesive agent The low-friction member can be fixed to the surface sheet without contacting the cover sheet on the skin-opposing surface side through the opening of the low-friction member. Thereby, the absorbent article of this aspect 13 can suppress the positional shift, peeling, etc. of the low-friction member, and can make the cover sheet move more stably.

In another aspect (Aspect 14) of the present invention, the absorbent article according to any one of Aspects 1 to 13, wherein the low-friction member is directed toward the aforesaid portion through both ends in the width direction. It is formed by a sheet-like member that is displaced toward the skin-facing side.

In the absorbent article of this aspect 14, since both end portions in the width direction of the sheet-like member forming the low-friction member are displaced toward the skin facing surface side, the ends after being displaced toward the skin facing surface side The cover sheet is tightly pressed against the wearer's skin, and the cover sheet can more accurately follow the wearer's skin.

In another aspect of the present invention (Aspect 15), the absorbent article according to any one of Aspects 1 to 14, wherein the absorbent article has at least one fold line extending in the width direction and The absorbent article in an unfolded state is folded in the length direction, and the low-friction member is arranged at a position where it does not overlap the fold line in a plan view.

Since the absorbent article of this aspect 15 is arrange | positioned at the position which does not overlap the fold line for folding the absorbent article in the unfolded state to the said longitudinal direction, a low width is not given to a low-friction member. The folds extending in the direction can not only ensure the ease of moving the aforementioned cover sheet, especially in the longitudinal direction, but also store the absorbent article in a tightly folded state in a packet or the like. [Inventive effect]

According to the present invention, it is possible to provide an absorbent article that does not easily cause discomfort to the wearer, and does not easily cause skin diseases such as bedsores and rashes.

Hereinafter, a preferred embodiment of the absorbent article of the present invention will be described in detail with reference to the drawings. In addition, in this specification, unless otherwise specified, [the object (for example, an absorbent article, a surface sheet, an absorbent body, a low-friction member, etc.) placed on a horizontal surface in an unfolded state is changed from vertical The upper side of the direction (when the object is an absorbent article, it is viewed from the surface sheet side) toward the thickness direction of the object)], and it is only referred to as [planar view angle].

Regarding various directions and the like used in this specification, unless otherwise specified, they are as follows. In this specification, [length direction] refers to [the length direction of a vertically long object (for example, an absorbent article, an absorbent body, etc.) in a plane view], and [width direction] refers to the [length direction of a long object in a plane view] Short direction (short side direction)], [thickness direction] means [vertical direction perpendicular to the object placed on the horizontal plane in the expanded state], such length direction, width direction and thickness direction The system is in a mutually orthogonal relationship. In addition, in the present specification, [plane direction] refers to a plane extending from a plane of [a thin sheet-like object (for example, an absorbent article, a surface sheet, an absorbent body, a low-friction member, a cover sheet, etc.) in a plane viewing angle. Direction (that is, horizontal plane direction)], the plane direction and the thickness direction are in a mutually orthogonal relationship. In addition, in this specification, [the proximal end side of the longitudinal direction of the object, which is located at the center of the longitudinal direction of the object and opposite to the longitudinal center axis C _W extending in the width direction] is referred to as [Inner side in the longitudinal direction] is referred to as [Outer side in the longitudinal direction] [in the longitudinal direction of the elongated object, the distal end side facing the central axis C _W in the longitudinal direction]. Similarly, [the proximal end side of the longitudinal object in the width direction thereof, which is located at the center in the width direction of the object and opposite to the width direction central axis C _L extending in the length direction] is referred to as [the width direction inside], the [width in the longitudinal direction of the object, the width direction of the central axis C _L of the opposite side of the distal end] as an outer side [the width direction]. In addition, in this specification, in the thickness direction of an absorbent article, the [proximity side opposite to the wearer's skin surface when the absorbent article is worn] is referred to in the thickness direction of the absorbent article without being specifically limited. [Skin facing side], [when the absorbent article is worn, the distal end side facing the wearer's skin side] is called [non-skin facing side]. Here, [when worn] means a period during which the absorbent article is worn by the wearer (that is, a point in time when the absorbent article is put into a usable state), and the state is maintained (during wearing period). In addition, in this specification, [skin facing surface side] and [non-skin facing surface side] and [non-skin facing surface side] of various members (for example, a surface sheet, an absorber, a low-friction member, a cover sheet, etc.) constituting an absorbent article [Surface] may be referred to only as [Skin-facing surface] and [Non-skin-facing surface].

Fig. 1 is a plan view of a urine absorption pad 1 (absorbent article) according to a first embodiment of the present invention, viewed from the surface sheet side in the thickness direction in an unfolded state, and Figs. 2 and 3 are urine absorption pads, respectively. 1 is a cross-sectional view taken along the line II-II and III-III in FIG. 1. 4 is an enlarged cross-sectional view of the main part of the urine absorption pad 1 shown in FIG. 2, and FIG. 5 is a perspective view of the low friction member 14 used in the urine absorption pad 1.

As shown in FIG. 1, the urine absorption pad 1 according to the first embodiment of the present invention is provided with a longitudinally elongated outer shape having a longitudinal direction L and a widthwise direction W in a plan view, and has the aforementioned longitudinal direction L. An hourglass-like shape with a slightly central portion narrowing toward the inner side in the width direction W. Furthermore, in the present invention, the outer shape of the absorbent article is not limited to such an external shape. If the length dimension in the length direction L is longer than the width dimension in the width direction W, any shape may be adopted in accordance with various applications and the like. (E.g. rectangular, oval, gourd, etc.).

As shown in FIG. 1, the urine absorption pad 1 of the first embodiment has, in a plane viewing angle, in the longitudinal direction L, sequentially: when worn, the wearer's abdomen (more specifically, Lower abdomen) corresponding to the abdominal region 2; when worn, the crotch region 3 corresponding to the wearer's crotch (more specifically, the lower crotch); and when worn, with the wearer The back region (more specifically, the buttocks) corresponds to the back region 4.

The basic structure of the urine absorption pad 1 is shown in FIG. 2 and FIG. 3 and includes: a liquid-permeable surface sheet 5 located on the skin-opposing surface side S ₁ of the urine absorption pad 1 in the thickness direction T; The liquid-absorbent absorbent 6 on the non-skin-facing surface side S ₂ of the surface sheet 5; in the back region 4, the skin-facing surface side S _{1 of the} surface sheet 5 has a penetration in the thickness direction T A sheet-like low-friction member 14 having a plurality of openings 16; and a cover sheet 13 located on the skin-opposing surface side S ₁ of the low-friction member 14 in the back region 4. Further, in the first embodiment, as shown in FIGS. 1 to 3, the urine-absorbent pad 1 further includes: both ends in the width direction W of the urine-absorbent pad 1, which are located on the skin-opposing surface side S ₁ opposite side sheet (specifically, one side side sheet 8 disposed on one end side in the width direction W and the other side side sheet 8 disposed on the other side end in the width direction W 9); a back sheet 7 located on the non-skin-facing side S ₂ of the urine absorption pad 1; and a liquid-impermeable and leak-proof sheet 10 located between the absorbent body 6 and the back sheet 7. In addition, as shown in FIG. 1 and FIG. 2, the pair of side sheets described above, when the urine-absorbent pad 1 is being worn, the respective edge portions (that is, one side sheet) on the inner side in the width direction W 8 widthwise inner end edge portion 8R and the other side side sheet 9 widthwise inner end edge portion 9L) are formed by shrinkage of the elastic member 11 such as a rubber thread to stand up to prevent leakage of excretion liquid such as urine Used for leak-proof wall section 12.

As described above, the urine-absorbent pad 1 of the first embodiment is provided with a skin-facing surface on the back sheet 5 in the back region 4 corresponding to the buttocks of a wearer who is prone to skin disorders such as bedsores and rashes. The low-friction member 14 on the side S ₁ and the cover sheet 13 which is in direct contact with the skin of the wearer (specifically, the skin of the buttocks). Therefore, the cover sheet 13 and the surface sheet 5 have low The friction member 14 reduces the frictional resistance. Therefore, the cover sheet 13 is relatively easy to move in a face-to-face direction with respect to the surface sheet 5. Accordingly, even if the wearer moves during wearing, the covering sheet 13 can move in a face-to-face direction with the wearer's skin in accordance with the wearer's movements. It is difficult for the user's skin to apply physical irritation caused by friction and displacement.

Further, in the first embodiment, the low-friction member 14 has a plurality of openings 16 penetrating in the thickness direction T, and the plurality of openings 16 are respectively located on the skin as shown in FIGS. 4 and 5. An opening peripheral edge portion 17 of the facing surface side S ₁ ; and a rib portion 18 protruding from the aforementioned opening peripheral edge portion 17 toward the non-skin facing surface side S ₂ .

Further, according to the first aspect of the urine absorbing pad 1 embodiment, due to the low friction member 14 each have a plurality of openings 16 from the opening portion peripheral edge portion 17 toward the non-skin-facing surface side of the projecting rib 18 S _2, therefore, the As shown in FIG. 4, the rib portion 18 functions as a spacer between the low-friction member 14 and the surface sheet 5, and can form an excretion caused by the aforementioned urine and the like between the low-friction member 14 and the surface sheet 5. the space portion S _P as a vent path of the fluid caused by moisture. Accordingly, the urine absorbent pad 1, since the urine excreted liquid towards the skin side S ₁ and the like to the reflux of moisture and the like which easily contact with the skin of the wearer, it is difficult to produce the wearer feel A wet state, a sultry state, or the like, or a condition in which the wearer's skin (skin) is kept wet (that is, the wearer's skin is in a swollen state). Therefore, the urine absorbing pad 1 according to the first embodiment is not likely to cause discomfort to the wearer, and it is also unlikely to cause skin diseases such as bedsores and rashes.

Hereinafter, various members constituting the absorbent article of the present invention will be described in more detail using the urine absorption pad 1 and the like of the aforementioned embodiment.

[Low-friction member] In the urine-absorbent pad 1 of the first embodiment, the low-friction member 14 is shown in FIGS. 1, 2, and 4, and is arranged on the surface sheet 5 in the back region 4 of the urine-absorbent pad 1. It is constituted by a low-friction sheet-like member that can reduce the frictional resistance with the cover sheet 13 arranged on the skin-opposing surface side S _{1 with} the cover sheet 13.

The low-friction member 14 has a predetermined longitudinal direction length (for example, 100 mm to 200 mm) along the longitudinal direction L of the urine absorption pad 1 and a width direction W of the urine absorption pad 1 in a plan view. A slightly rectangular outer shape having a predetermined width-wise length (for example, 50 mm to 150 mm). Furthermore, in the present invention, the external shape (planar viewing angle shape) of the low-friction member is not limited to this aspect, and any external shape (for example, circular shape) may be adopted as long as it can reduce the frictional resistance with the cover sheet. , Oval, polygon, etc.) and size. The low-friction member may be formed of a single sheet-like member as in the first embodiment, or may be formed of a plurality of sheet-like members divided in the longitudinal direction and / or the width direction. In this case, the plurality of sheet-like members constituting the low-friction member are arranged at predetermined intervals in the length direction and / or width direction. If the plurality of sheet-like members are arranged in such a manner, Easy to ensure liquid permeability and air permeability.

In the present invention, the sheet-like member that can be used as a low-friction member is not particularly limited as long as it can reduce the frictional resistance with the cover sheet. For example, olefin resins such as polyethylene and polypropylene, and silicon oxide can be used. Resin resin, fluororesin such as polytetrafluoroethylene and other resins with low friction coefficient, or resinous sheet-like members made of resin composition; olefin resins such as polyethylene and polypropylene, and polyparaphenylene At least one of the surfaces of a thermoplastic resin such as a polyester resin such as polyethylene diformate or a substrate sheet made of a thermoplastic resin composition (in an absorbent article, facing the skin The surface-side surface) is a coating-type sheet-like member that is coated with a low-friction material having a low coefficient of friction such as silicone resin or fluororesin. In addition, in this specification, the sheet-like member and the substrate sheet include a thin sheet having a flat structure and a thin film, and a sheet having an arbitrary structure such as an uneven structure, a woven, non-woven, and woven cloth And other fiber sheets, and sheet structures in any form such as laminated sheets in which these are arbitrarily combined.

When the above-mentioned resin sheet-like member is used as the low-friction member, it is preferable that the resin sheet-like member contains a high-density polyethylene (HDPE) in a proportion of 50% by mass or more, and contains 50/50 to 75 / The mass in the range of 25 is better than those of high density polyethylene (HDPE) and low density polyethylene (LDPE). If the low-friction member is formed of a resin-made sheet-like member containing high-density polyethylene at a ratio of 50% by mass or more, the low-friction member is formed of a high-density polyethylene component to have hardness and friction of a certain value or more. A member having a low resistance can prevent the rib portion of the opening portion formed in the low-friction member from being easily crushed in the thickness direction, and can ensure the low-friction property of the low-friction member in a wider range. Therefore, an absorbent article having a resin sheet-like member as a low-friction member can more stably perform the function of the rib as a spacer between the low-friction member and the surface sheet, and as a result, it is not easy to wear. The person's skin is subject to physical irritation caused by friction, deflection, etc., and the excreted fluid such as reflux urine and its moisture are less likely to contact the wearer's skin. In addition, if the resin sheet-like member forming the low-friction member is a high-density polyethylene and a low-density polyethylene containing a mass ratio in the range of 50/50 to 75/25, the soft low-density polyethylene component, It is possible to reduce stress (ie, internal residual stress) remaining inside the sheet-like member when the sheet-like member is formed of a resin material, when the sheet-like member is formed with an opening, and the like, and it is possible to suppress the sheet-like member (especially the sheet) The end in the width direction of the member-like member) is rounded (ie, curled) by the relaxation of internal residual stress. Therefore, in an absorbent article having such a resin sheet-like member as a low-friction member, since the cover sheet can move more smoothly on the low-friction member, it is more difficult to make frictional, shifting forces, etc. The resulting physical stimulus is applied to the skin of the wearer.

In the present specification, high density polyethylene refers to polyethylene having a density of 0.942 g / cm ³ or more, and low density polyethylene refers to polyethylene having a density of less than 0.910 g / cm ^{3 to} 0.930 g / cm ³ . .

When the coated sheet-like member is used as the low-friction member, the coated sheet-like member can be formed by using at least a substrate sheet made of the above-mentioned general-purpose thermoplastic resin or thermoplastic resin composition. One surface is coated with a low-friction material such as a silicone resin in a predetermined amount (for example, an amount in the range of about 0.6 g / m ² to 0.8 g / m ² ). When a silicone resin is used as the low-friction material, the form of the silicone resin is not particularly limited, and any of a solvent-based, solvent-free, or latex-based resin can be used, and the silicone resin is hardened. The aspect is not particularly limited, and either a thermosetting type or an ultraviolet curing type silicone resin can be used. Among them, in the case of using a plastic film composed of the aforementioned thermoplastic resin or thermoplastic resin composition as the substrate sheet, when the silicone resin is hardened by heating, the substrate sheet may be deformed, There is a possibility of melting. Therefore, it is preferable to use an ultraviolet curable silicone resin. In addition, the coating method of the low-friction material is not particularly limited, and any coating method such as a spray method, a roll method, or a dipping method can be adopted.

The structure of the low-friction member is not particularly limited as long as the low-friction member has low friction and can reduce frictional resistance with a cover sheet disposed on the skin-opposing surface side, and has an opening portion to be described later. Any structure other than a sheet-like member (for example, at least one slender rod-like member, at least one band-like member, etc.), but considering that a low-friction area can be ensured widely, the surface of the low-friction member covers the sheet For ease of sliding (easiness of movement in the plane direction), softness of the entire absorbent article, and the like, it is preferable to use a sheet-like member having a generally flat structure as a whole as in the aforementioned embodiment.

Further, a sheet-like member that can be used as a low-friction member is not limited to those having a slightly flat structure as a whole in the first embodiment, and the sheet-like member may be, for example, opposite ends of the absorbent article in the width direction facing the skin. Bend (i.e., displacement) to the surface side. When both ends of the sheet-like member forming the low-friction member in the width direction are displaced toward the skin-facing surface side, the ends after being displaced toward the skin-facing surface side face the skin of the low-friction member. The cover sheet on the side is tightly pressed against the wearer's skin, and the cover sheet can more accurately follow the wearer's skin.

Moreover, in the present invention, the static friction coefficient of the surface of the low-friction member (at least the surface facing the skin-facing side) is faced with the skin of the wearer in order to ensure that the cover sheet can cooperate with the movement of the wearer. There is no particular limitation on the ease of moving left and right, and for example, it is in the range of 0.04 to 0.80, preferably in the range of 0.10 to 0.50, and more preferably in the range of 0.10 to 0.40. In addition, the kinetic friction coefficient of the surface of the low-friction member is also not particularly limited as long as the covering sheet can ensure the ease of sliding left and right along with the wearer's skin in a face-to-face direction in accordance with the wearer's movement. For example, in the range of 0.10 to 0.75, ideally in the range of 0.10 to 0.55, and more preferably in the range of 0.10 to 0.45. Furthermore, the static friction coefficient and the dynamic friction coefficient are measured in accordance with the JIS P8147 (b) level rule. When measuring the coefficient of static friction and coefficient of dynamic friction, for example, as a test piece for a horizontal plate, a friction cotton cloth [interlaced No. 3 (kanakin No. 3), etc.] specified in JIS L0803 can be used, and it can also be used as a weight For the test piece, a low-friction member was used.

In the present invention, the low-friction member may be configured to completely repeat in the thickness direction with the cover sheet (that is, the low-friction member and the cover sheet have the same plane viewing area), or may be configured to be a low-friction member in plan view. Although the cover sheet is included, the low-friction member is arranged to form a cover sheet at a position overlapping the cover sheet in the thickness direction from the viewpoint of ensuring good skin feel, liquid permeability, and air permeability. A narrow range is preferred. In this case, the low-friction member preferably has a planar viewing area not exceeding a certain value even if the cover sheet has been moved in a planar direction. For example, the low-friction member covers a planar viewing area. The plane viewing angle area of the sheet is in a range of 10% to 80%, preferably in a range of 20% to 60%, and more preferably in a range of 25% to 50%.

The position where the low-friction member is arranged is not particularly limited as long as it overlaps with the cover sheet in a planar viewing angle, but it is preferably a slightly central position of the cover sheet. The absorbent article of the present invention preferably has at least one fold line, which extends in the width direction and is used to fold the absorbent article in the unfolded state in the length direction. In this case, the low-friction member is in a plan view. Preferably, it is arranged at a position that does not overlap the aforementioned fold line. For example, in the first embodiment described above, the urine-absorbent pad 1 is located at a position near the abdomen side of the crotch region 3 and a position near the abdomen side of the back region 4 and each has a fold line that extends in the width direction W and The folded urine absorbing pad 1 is folded in the longitudinal direction L (the first fold line L ₁ and the second fold line L _{2 in} FIG. 1), and the low-friction member 14 is disposed so as not to overlap the fold lines. (Specifically, the position in the back region 4 is closer to the back side than the second fold line L ₂ ). If the low-friction member is disposed at a position that does not overlap such a fold line, the low-friction member will not be provided with a crease extending in the width direction. Therefore, it is possible to ensure that the cover sheet is particularly moved in the longitudinal direction. Easily, the absorbent article can be stored in a bag or the like in a compact state folded in the longitudinal direction.

In the urine absorption pad 1 of the first embodiment, the low-friction member 14 has a plurality of openings 16 that penetrate the low-friction member 14 in the thickness direction T as shown in Figs. 2, 4 and 5. The plurality of openings 16 each have a substantially circular outer shape in a plan view, and are arranged in a zigzag shape on the surface of the low friction member 14. Furthermore, in the absorbent article of the present invention, the external shape, arrangement, and the like of the openings of the low-friction member are not particularly limited as long as they do not hinder the effects of the present invention, and the openings may be viewed from a plane. The outer shape of any shape other than a circle (for example, a line-symmetric shape such as an ellipse, a quadrangle, and a hexagon) can also be arranged by an arbitrary arrangement such as a plurality of rows, a grid, and the like. In addition, the plurality of openings may have all the openings having the same outer shape, or a part of the openings may have different outer shapes, and all the openings may have different outer shapes.

The plurality of openings 16 of the low-friction member 14 each have an opening peripheral edge portion 17 and a rib portion 18 protruding from the opening peripheral edge portion 17 toward the non-skin-facing surface side S ₂ as shown in FIGS. 4 and 5. The peripheral edge portion of the opening is a peripheral edge portion of the opening portion 16 that opens toward the surface of the skin-opposing surface side S ₁ of the low friction member 14 and is a thickness t of the base portion 14 b other than the opening portion 16 having the lower friction member 14. _b (Furthermore, the base portion 14b is a portion having a slightly constant thickness in the low friction member 14, which is the same as the "[thickness] of the low friction member"). The portion enclosed by the dotted line) is divided into sections. The opening 16 has a structure in which the opening diameter in the thickness direction T is from the skin-facing surface side S _{1 to} the non-skin-facing surface side S ₂ . (That is, the diameter of the opening) gradually becomes smaller, and the front end has a thinner structure. The rib portion 18 is attached to the front end portion 18T of the rib portion 18 and is in contact with the surface of the skin facing surface side S ₁ of the surface sheet 5.

In the urine absorbing pad 1, the rib portion 18 has a product of a height (h _r ) and a thickness (t _r ) of the rib portion in a range of 2.0 × 10 ^-3 mm ² to 5.0 × 10 ^-3 mm ² . Within a specific structure. Here, the protruding height (h _r ) of the rib means that as shown in FIG. 4, a portion other than the opening portion of the low-friction member 14, that is, the skin-opposing surface of the base portion 14 b is used as a reference surface, and the reference surface and the rib portion 18 located on the closest distance between the vertical side 18T ₂ S distal portion of the non-skin (mm), a thickness (t _r) of the rib means of the rib 18, corresponding to the projecting rib A portion of the height (h _r ) that is 1/2 of the height (that is, a distance in the vertical direction from the aforementioned reference surface or the front end portion 18T is formed as a portion that is 1/2 of the protruding height (h _r ) of the rib portion. ) 'S thickness (mm).

In the present invention, the protruding height (h _r ) of the rib portion and the thickness (t _r ) of the rib portion formed in the opening portion of the low-friction member are not particularly limited as long as they do not hinder the effects of the present invention. For example, the rib The protruding height (h _r ) of the part is within the range of 0.05 mm to 1.2 mm, and is preferably within the range of 0.1 mm to 0.5 mm. The thickness of the rib (t _r ) is 0.001 mm to The thickness is within a range of 0.1 mm, and preferably within a range of 0.005 mm to 0.05 mm, but the ribs are preferably the same as the urine absorbing pad 1 described above, and preferably have a height (h _r ) and a thickness (t _r ) of the ribs. The product formation is preferably a specific structure in the range of 2.0 × 10 ^-3 mm ² to 5.0 × 10 ^-3 mm ² , and the product formation is 2.2 × 10 ^-3 mm ² to 4.8 × 10 ^-3 mm. The structure in the range of ² is more preferable. If the ribs formed in the openings of the low-friction member have the specific structure described above, the ribs are difficult to face even when a force such as the body pressure of the wearer is applied in the thickness direction of the absorbent article. Being crushed in the thickness direction can not only maintain the low friction of the low friction member (that is, a state in which the friction resistance between the cover sheet and the low friction member is small), but also can more stably function as the low friction member and the surface. The function of the spacer between the sheets. As a result, an absorbent article having a low-friction member having ribs having such a specific structure is not only difficult to apply physical irritation due to friction, deflection force, etc. to the skin of the wearer, but also returns urine and the like. The fecal fluid, its moisture, and the like are less likely to come into contact with the skin of the wearer. Therefore, it can more easily and stably exert the effect of preventing the wearer from feeling uncomfortable and causing skin diseases such as bedsores and rashes. .

In addition, the thickness of the low-friction member (that is, the distance between the skin-facing surface and the non-skin-facing surface of the base portion other than the opening portion of the low-friction member) is not limited as long as it does not hinder the effect of the present invention. In this case, it is not particularly limited, and any [thickness] (for example, [thickness] in the range of 0.01 mm to 1.0 mm) in consideration of flexibility, strength, and the like may be used.

In this specification, the thickness of the low-friction member, the protruding height of the ribs, and the thickness of the ribs can be measured by any non-contact measuring device such as a laser shift meter, or by using a scanning type. The measurement is performed by observing the enlarged cross section of an electron microscope or the like. In addition, the thickness of the low-friction member, the protruding height of the ribs, the thickness of the ribs, and the influence of measurement errors are taken into consideration.

Further, in the first embodiment, as shown in FIG. 4, the peripheral edge portion 17 of the opening portion 16 is bent toward the non-skin facing surface side S ₂ as it faces the center of the opening of the opening portion 16. The ribs 18 are integrally connected. In this way, if the skin-facing surface of the opening peripheral portion 17 is bent toward the non-skin-facing surface side S ₂ , the ribs 18 can be strengthened even when a force is applied to the surface direction by a wearer's motion. The force applied to the surface is balanced against the ground, and even if the rib portion 18 is crushed in the thickness direction T, the curved opening peripheral portion 17 can function like a leaf spring to easily restore the rib portion 18, and as a result, it is possible to more reliably and continuously forming the space portion S _P. In addition, when the skin-facing surface of the opening peripheral portion 17 is bent toward the non-skin-facing surface side S ₂ , the opening peripheral portion 17 cannot be easily hooked on the cover sheet 13 (especially the cover sheet 13 moving in the surface direction). ), The frictional resistance between the cover sheet 13 and the low-friction member 14 can be further reduced.

In the present invention, the opening diameter (mm) of the opening portion of the low-friction member is not particularly limited as long as it does not hinder the effects of the present invention. For example, the opening diameter (d ₁ ) of the opening peripheral portion is 0.01 mm to 5.0. In the range of mm, the opening diameter (d ₂ ) of the front end of the rib is in the range of 0.005 mm to 4.5 mm. Here, the opening diameter (d ₁ ) of the opening peripheral portion refers to an opening diameter using a boundary between the opening peripheral portion 17 and a portion other than the opening portion 16 (that is, the base portion 14 b) as a reference position, as shown in FIG. 4. In other words, the diameter of the inscribed circle (the largest circle inscribed in the plane view pattern) drawn by the boundary line between the opening peripheral portion 17 and the base portion 14b. Similarly, the opening diameter at the front end of the rib means the diameter of the circle inscribed in the plane viewing angle pattern drawn by the front end portion 18T of the rib 18 as shown in FIG. 4. These opening diameters can be measured by magnifying and observing the surface or cross section of the opening by using any magnification observation means such as a microscope or a scanning electron microscope.

In the first embodiment described above, the rib portion 18 of the opening portion 16 is formed of a material for forming a low-friction member (for example, a thin sheet member made of resin, a base sheet, or the like) so as to have a plurality of peripheral surfaces, as described later. The suction roller of the suction hole sucks in the thickness direction while heating, and is formed at the same time as the perforation (that is, the formation of the opening peripheral edge portion). Therefore, the rib portion 18 is shown in FIG. The non-skin facing surface side S ₂ has a small thickness and relatively high density. Accordingly, the rigidity of the end portion 18T of the rib portion 18 located on the non-skin-facing surface side S ₂ is relatively higher than the rigidity of the opening peripheral portion 17. In this way, if the rigidity of the front end portion 18T of the rib portion 18 is higher than the rigidity of the opening peripheral portion 17, the front end portion 18T in contact with the surface sheet 5 can ensure a certain strength and the rib portion 18 is not easily deformed. as aforesaid, the force applied to the case where the surface direction and the thickness direction T, the surface of the sheet can be between 5 and 14, more reliably formed in the space portion S _P low-friction member. Furthermore, in the present invention, the means for increasing the rigidity of the front end portion of the rib is not limited to the above-mentioned high density. The front end portion of the rib can also be made more rigid by using a high-strength material, a high-strength structure, or the like.

In the present invention, the means for forming the opening in the low-friction member is not particularly limited. For example, a material for forming a low-friction member (for example, a resin-made sheet-like member, Substrate sheet, etc.) while sucking in the thickness direction while heating, and then perforating the portion of the low-friction member forming material corresponding to the above-mentioned suction hole with the suction force of the suction drum, or using an opening having a peripheral edge portion of the opening. A roller-shaped or flat-plate-shaped mold member having a plurality of holes or recesses having a diameter of approximately the same diameter, and a small diameter provided with a degree such that the ribs can be formed (that is, the diameters of the openings at the tips of the ribs are substantially the same). (Diameter) of any of the roller-shaped or flat-shaped mold members of a plurality of through-hole projections (such as needle-shaped projections), and a gear processing device that holds a material for forming a low-friction member on the mold members. The perforation is carried out while applying pressure at the same time, thereby forming the aforementioned peripheral edge portion and the rib portion simultaneously. Furthermore, the protruding height (h _r ) of the ribs and the thickness (t _r ) of the ribs can be adjusted by adjusting the suction force of the suction drum, the heating temperature, or the like, or adjusting the inner peripheral surface and the perforation of the hole portion of the mold member. The intervals between the outer peripheral surfaces of the protrusions are each formed within a predetermined range. In addition, the opening may be formed, for example, by using a plurality of through-holes in the material for forming a low-friction member using an arbitrary perforation means, and then pressing the periphery of the through-holes by any forming method such as compression molding or vacuum forming. The rib is formed into a predetermined shape, thereby forming a rib having the aforementioned specific structure.

In the urine absorbing pad 1 of the first embodiment described above, the ribs 18 of the openings 16 are connected to the front end 18T and are in contact with the skin-facing surface of the surface sheet 5. However, the absorbent article of the present invention is not limited to this. Such an appearance. Here, FIG. 6 is an enlarged sectional view of a main part of a modified example of the urine absorbing pad 1 of the first embodiment. In addition, in FIG. 6, the configuration other than the configuration different from the first embodiment is basically the same as that of the first embodiment, and therefore the description is omitted here. In the modification shown in FIG. 6, the front end portion 18T of the rib portion 18 of the opening portion 16 located on the non-skin-facing surface side S ₂ is located inside the surface sheet 5. Since the urine absorption pad 1 of this modification is provided with the opening 16 in the low-friction member 14, the front end portion 18T of the rib portion 18 is located inside the surface sheet 5 (that is, the front end portion 18T of the rib portion 18 enters) the internal configuration of the surface sheet 5), so that, by the effect of the structure of the fixture, so that the rib 18 becomes easy to move or deform, more stable and can be reliably formed in the space portion S _P.

Furthermore, in the present invention, the low-friction member is preferably joined to the surface sheet by an arbitrary joining means such as a hot-melt adhesive, and the front end portion of the rib portion of the opening is preferably joined to the surface sheet. . In addition, the bonding means can be used continuously and intermittently in the longitudinal direction and / or width direction of the absorbent article. However, when the bonding means is used intermittently, it is easy to ensure air permeability, and it is not easy in the absorbent article. Sultry.

Further, it is preferable that the surface sheet and the low-friction member are at least partially bonded with a low-adhesive adhesive having a measured value of 0.78 N or less through a probe adhesion test. If the surface sheet and the low-friction member are at least partially bonded through such a low-adhesive adhesive, the low-adhesive adhesive will not cover the skin-facing side through the opening of the low-friction member. The contact of the sheet can also fix the low-friction member to the surface sheet. Therefore, it is possible to suppress the positional shift, peeling, and the like of the low-friction member, and to make the cover sheet move more stably. Furthermore, the measurement value of the probe adhesion test can be measured using an arbitrary test device of a probe adhesion type (for example, an adhesion tester manufactured by RHESCA Co., Ltd.).

[Cover Sheet] Next, a cover sheet used in the absorbent article of the present invention will be described. In the urine absorption pad 1 of the first embodiment, the cover sheet 13 is as shown in FIGS. 1, 2 and 4 so that the thickness of the urine absorption pad 1 on the back region 4 of the urine absorption pad 1 and the low friction member 14 The direction T is repeated on the skin-facing surface side S _{1 of} the low-friction member 14 and is arranged so as to include the entire low-friction member 14 so that the low-friction member 14 is not exposed in a planar viewing angle. As described above, the covering sheet 13 can move in a face-to-face direction with the wearer's skin in accordance with the movement of the wearer. Therefore, it is difficult for the wearer's skin to apply physical properties caused by friction or displacement. Sexual stimulation.

The cover sheet 13 has a predetermined length in the longitudinal direction L along the length direction L of the urine absorption pad 1 and a predetermined width in length along the width direction W of the urine absorption pad 1 in a plan view. In addition, the outer shape is slightly rectangular in the length direction L. Furthermore, in the present invention, the outer shape of the cover sheet is not limited to this aspect, and any outer shape (e.g., circular, oval, polygonal, etc.) may be adopted as long as it covers the entire low-friction member.

In the urine-absorbent pad 1 of the first embodiment, as shown in FIGS. 1 and 2, the cover sheet 13 has the one side end portion 13L in the width direction W joined to the widthwise inner end edge of the one side side sheet 8. The inner side portion 8S of the portion 8R and the other side end portion 13R in the width direction W are joined to the inner side portion 9S of the other side side sheet 9 near the widthwise inner end edge portion 9L. As shown in FIG. 1, the cover sheet 13 and the side sheets are joined from each end in the longitudinal direction L of the cover sheet 13 to the other end to form a joint extending in the longitudinal direction L. Department 15. Furthermore, in the first embodiment, the cover sheet 13 does not extend to both ends in the width direction W of the urine absorbing pad 1.

In this way, the cover sheet 13 is formed on the opposite side sheet that can form the leak-proof wall portion 12 and has a greater degree of freedom of movement, and is not directly fixed to the body portion of the urine absorption pad 1 (here, the body of the urine absorption pad 1 The part refers to the part composed of the top sheet 5, the absorber 6, the leak-proof sheet 10, and the back sheet 7). Therefore, it is not easy to restrict the movement of the cover sheet 13 by the body portion of the urine absorption pad 1. Instead, borrow The cover sheet 13 is relatively easily moved to the main body portion of the urine absorption pad 1 by being attached to the side sheet having a large degree of freedom of movement. In addition, the cover sheet 13 is joined to a side sheet that can form one of the leak-proof wall portions 12 when worn. Therefore, when the urine absorption pad 1 is worn, the widthwise inner ends of the pair of side sheets are used. stand edge portion, so that the cover sheet 13 from the surface of the sheet 5, toward the skin 14 and the like floating on _a low-friction member toward the side surface S, the low-friction member 13 and the cover sheet of low friction resistance between the friction member 14 less likely to occur, and 14. It is difficult to apply a force in the thickness direction T. In addition, in the absorbent article of the present invention, the cover sheet may be directly fixed to the main body of the absorbent article if the covering sheet is not restricted in movement. That is, the cover sheet is bonded to the main body portion (more specifically, the top sheet, the back sheet, etc.) of the absorbent article so as not to be restricted in its operation, and can be flexed sufficiently to form wrinkles.

The size of the width direction W of the joint portion 15 between the cover sheet 13 and each of the side sheets is such that the cover sheet 13 can be joined as long as the cover sheet 13 is not detached during wearing of the urine-absorbing pad 1. It is not particularly limited, but is preferably in a range of 5 to 30 mm, more preferably in a range of 10 to 25 mm, and even more preferably in a range of 15 to 20 mm. In addition, the joining method of a cover sheet and each side sheet is not specifically limited, Any arbitrary joining methods, such as a hot-melt-type adhesive agent and a hot-melt, can be used.

In the first embodiment, the covering sheet 13 is disposed only on the urine absorption pad 1 so as to correspond to the vicinity of the hips (particularly near the sacrum) of a wearer who is prone to skin disorders such as bedsores and rashes. The back region 4 is not limited to such an arrangement in the absorbent article of the present invention. The cover sheet is not only the back region, but may be disposed in a part of the abdomen region, the crotch region, and the like that may cause the aforementioned skin disorders.

Further, in the first embodiment, as shown in FIG. 1, the cover sheet 13 is arranged so that the back-side end edge portion 13B of the cover sheet 13 extends to the back-side end edge portion 1B of the urine absorption pad 1. Arranging the cover sheet in this way is not an essential constituent element in the absorbent article of the present invention, but it is preferable that the cover sheet extends as far as possible to the position close to the back side of the absorbent article. When the cover sheet is extended to such a position, it is possible to more widely cover the vicinity of the buttocks of a wearer who is prone to skin disorders, and therefore, the skin disorders are less likely to occur.

The size of the cover sheet is not particularly limited as long as it can function as the cover sheet. The length of the cover sheet in the longitudinal direction is, for example, within a range of 25% to 100% of the length of the back region 4 in the longitudinal direction. The range is from 30% to 80%, and more preferably from 40% to 70%. When the outer shape of the cover sheet is a shape other than a rectangular shape, the length in the longitudinal direction means the maximum length in the longitudinal direction. In addition, the width in the width direction of the cover sheet is to consider the range of the skin-prone area and the ease of leakage of excretory fluid. For example, in the range of 50mm to 250mm, it is preferably in the range of 80mm to 200mm, more preferably 100mm to 180mm In the range. When the outer shape of the cover sheet is a shape other than a rectangular shape, the length in the width direction means the maximum length in the width direction.

In the present invention, the material constituting the cover sheet is not particularly limited, and any non-woven fabric such as a hot air nonwoven fabric, a spunbond non-woven fabric, a fabric, a knitted fabric, or a plastic film may be used. The sheet-shaped member may have hydrophilicity. Or hydrophobic. Since the covering sheet used in the present invention may be in direct contact with the skin of the wearer, it is preferable to use a sheet-like member having excellent skin feel and softness among the aforementioned sheet-like members. Examples of such a sheet-like member include nonwoven fabrics such as hot-air nonwoven fabrics and spunbond nonwoven fabrics. Further, the sheet-like member constituting the covering sheet is preferably one having excellent hydrophobicity from the viewpoint of making it difficult to wet the skin of the wearer (specifically, the skin of the buttocks). Furthermore, even when a hydrophilic material is used as the sheet-like member constituting the covering sheet, since excretory fluid such as urine and moisture can be transmitted to a certain extent, it is difficult to excrete urine or the like. Liquid, its moisture, etc., collect between the wearer's skin and the cover sheet.

In addition, the cover sheet may be formed by a sheet-like member that can be expanded and contracted in at least one direction. If the cover sheet is formed by such a sheet-like member that can be extended and contracted in at least one direction, the cover sheet can easily follow the movement of the wearer's hip when the wearer's buttocks move, and can be used with the buttocks more accurately. Movement can therefore make it easier for the wearer's buttocks to apply physical stimuli due to friction, shifting forces, and the like. In addition, if the covering sheet is stretchable and the longitudinal direction of the absorbent article, the covering sheet can also be used with the buttocks when the wearer's buttocks are shifted forward when getting up from bed and in wheelchair use. It moves reliably, so that it is more difficult to apply the physical stimulus caused by the friction and displacement force described above, and as a result, it is possible to more reliably prevent skin diseases such as bedsores and rashes from occurring.

The sheet-like member capable of being stretched in at least one direction is not particularly limited as long as it is stretchable in at least one direction. For example, a non-woven fabric or a knitted fabric containing elastic fibers; a ridge and a groove portion are alternately formed Non-woven fabrics on the surface (that is, non-woven fabrics with a ridge groove structure); non-woven fabrics subjected to gear extension processing; non-woven fabrics or knitted fabrics equipped with elastic members; and laminated bodies in which these are arbitrarily combined. Among them, a non-woven fabric with a dorsal ridge and groove structure can be stretched and contracted in a direction orthogonal to the direction in which the raised portion and the groove portion extend. The physical irritation is also small, and therefore, it can be particularly preferably used as a cover sheet.

[Side Sheet] Next, an opposite sheet which is one of the absorbent articles used in the present invention will be described. In the urine absorption pad 1 according to the first embodiment, as shown in FIGS. 1 to 3, a pair of side sheets are placed on the skin-opposing surface side S _{1 of the} surface sheet 5, and are disposed on the urine absorption pad 1. A strip-shaped one-side sheet 8 on one end in the width direction W and a strip-shaped other-side sheet 9 disposed on the other end in the width direction W of the urine absorption pad 1 . The one side sheet 8 and the other side sheet 9 are shown in FIG. 1, and extend from the abdominal side edge 1A in the longitudinal direction L of the urine absorption pad 1 to the back side end in a plan view. The edge portion 1B, as shown in FIG. 2, is located in the widthwise outer end edge portion 8L of the one side side sheet 8 on the outer side in the width direction W and the widthwise outer end edge portion 9R of the other side side sheet 9, respectively. One side edge portion and the other side edge portion of the drain sheet 10 in the width direction W are joined to form a fixed end. In addition, the width side inner edge portion 8R of the side sheet 8 located on the inner side of the width direction W and the other The widthwise inner end edge portion 9L of the one side sheet 9 is not joined to any member to form a free end.

Furthermore, as will be described later, the leak-proof sheet is an absorbent article of the present invention and is not an essential constituent element. Therefore, when the absorbent article is not provided with a leak-proof sheet, the pair of side sheets may be respectively separated from the back surface. One side end edge portion (one side end edge portion 7L of the first embodiment) and the other side end edge portion (the other side end edge portion 7R of the first embodiment) of the sheet are joined in the width direction.

In the first embodiment, as shown in FIG. 1 and FIG. 3, one side sheet 8 and the other side sheet 9 are respectively provided with elastic members 11 along the longitudinal direction L, and the elastic members are The vicinity of the widthwise inner end edge portion 8R and the widthwise inner end edge portion 9L are used to shrink the one side-side sheet 8 and the other side-side sheet 9 in the lengthwise direction L to raise the widthwise inner end edge portions. As a result of the contraction of the elastic member 11, the widthwise inner edge of each of the one side sheet 8 and the other side sheet 9 stands up, forming a leak prevention for preventing excretion fluid such as urine from leaking in the width direction.墙 部 12。 The wall portion 12.

In the first embodiment, as shown in FIG. 1, the elastic member 11 is arranged from the abdominal region 2 in the longitudinal direction L of the urine-absorbent pad 1 to a wide region extending over the back region 4. However, in the present invention, The arrangement form of the elastic member is not particularly limited. For example, the elastic member may be arranged over the entire length of the pair of side sheets in the length direction, or may be arranged near the front side edge and the back side edge in the length direction of the pair of side sheets as in the aforementioned embodiment. Within a predetermined range. Furthermore, if the elastic member is arranged like the latter, there is an advantage that the end portion in the longitudinal direction of the absorbent article cannot be easily rolled up and folded back.

The elongation magnification when the elastic member is mounted on a pair of side sheets is not particularly limited as long as the cover sheet is not excessively pulled and leakage of excretory fluid is unlikely to occur. The elongation magnification is a natural length of the elastic member, for example, 1.3 In the range of ~ 3.0 times, it is preferably in the range of 1.5 to 2.5 times, and more preferably in the range of 1.7 to 2.3 times. Furthermore, in the first embodiment, one elastic member 11 is arranged at each of the widthwise inner end edge portion 8R of the one side sheet 8 and the widthwise inner end edge portion 9L of the other side sheet 9, but In the present invention, it is not limited to such an arrangement aspect, and two or more elastic members may be arranged on each of the pair of side sheets. Further, as the elastic member, rubber threads and the like generally used in absorbent articles such as urine-absorbing pads and disposable diapers can be used.

In the first embodiment, as shown in FIG. 1, a pair of side sheets (that is, one side sheet 8 and the other side sheet 9) have a length along the urine absorption pad 1. The liquid-impervious sheet having a long, strip-like outer shape in the direction of the direction L is not limited to such a configuration in the present invention, and a predetermined leak-proof wall portion can be formed if In this case, a liquid-impermeable sheet having an arbitrary external shape and size can be used.

The belt-like liquid-impermeable sheet that can be used as a side sheet is not particularly limited as long as it has a predetermined liquid-impermeable property and softness. For example, a non-woven fabric imparting hydrophobicity (for example, hydrophobic Spunbond nonwoven fabrics with hydrophobic properties, dot-bonded nonwoven fabrics, spunbond / meltblown layers / spunbond (SMS) nonwovens, etc., liquid-impermeable synthetic resin films, and laminates thereof Wait for any liquid-impermeable sheet.

The basis weight and thickness of the belt-like liquid-impermeable sheet (such as a hydrophobic nonwoven fabric) that can be used as a side sheet are not particularly limited as long as they do not hinder the effects of the present invention, and can be considered. Arbitrary basis weight and thickness such as liquid impermeability and flexibility.

Furthermore, having such a side sheet is not an essential constituent element in the absorbent article of the present invention, but if the absorbent article has such a side sheet, it has the following advantages, that is, it is particularly effective in absorbing In the width direction of the sexual article, leakage of excretion liquid such as urine can be more effectively suppressed, and the aforementioned cover sheet is joined, so as described above, the friction resistance between the cover sheet and the low-friction member is less likely to occur, and This makes it difficult to apply the force in the thickness direction to the low-friction member.

[Surface Sheet] Next, a surface sheet used in the absorbent article of the present invention will be described. In the urine-absorbent pad 1 of the first embodiment, the surface sheet 5 is shown in FIGS. 1 to 3. The surface sheet 5 is disposed in a position other than a portion overlapping the cover sheet 13 and the low-friction member 14 in the thickness direction T. The position in direct contact with the skin of the wearer (that is, the position of the skin-opposing surface side S ₁ of the urine absorption pad 1) is provided by a liquid-permeable sheet that allows the excretion fluid discharged from the wearer to pass through. Make up.

As shown in FIG. 1 to FIG. 3, the surface sheet 5 extends in the longitudinal direction L and the width direction W so as to cover the entire surface of the absorber 6 disposed on the non-skin facing surface side S ₂ of the surface sheet 5 in a planar viewing angle. And has a substantially rectangular outer shape with a length that is long in the direction of the length direction L of the urine absorption pad 1. Furthermore, in the absorbent article of the present invention, the outer shape of the surface sheet is not limited to this aspect, and if the skin facing surface of the absorbent body disposed on the non-skin facing surface side of the surface sheet is not at least in the crotch region Those who can be exposed can adopt various shapes and sizes according to various applications.

The liquid-pervious sheet that can be used as the surface sheet is not particularly limited as long as it has predetermined liquid-permeability, skin feel, and the like. For example, a thermoplastic resin that uses cellulose-based fibers and has been subjected to a hydrophilization treatment can be used. Arbitrary nonwoven fabrics such as spunbond nonwoven fabrics, hot-air nonwoven fabrics, SMS nonwoven fabrics, etc. formed from fibers and the like.

In the absorbent article of the present invention, the structure of the surface sheet is not particularly limited as long as it has predetermined liquid permeability, skin feel, and the like. For example, the surface sheet 5 according to the first embodiment may be used. A person having a slightly flat structure may also adopt a surface sheet having a predetermined uneven structure as described in the second embodiment described later. However, from the viewpoint that the effects of the present invention can be exerted more strongly, the surface sheet is made as described below. The predetermined uneven structure such as the surface sheet of the second embodiment is preferred.

In addition, the basis weight and thickness of the liquid-permeable sheet (non-woven fabric, etc.) usable as the surface sheet are not particularly limited as long as the effects of the present invention are not hindered, and the liquid-permeability and skin contact can be taken into consideration. Any base weight and thickness such as sensation can be used. However, from the viewpoint of preventing backflow of excretory fluid, it is preferable to use a thicker liquid-permeable sheet as the surface sheet.

In addition, the surface sheet may be bonded to the non-skin-facing surface of the pair of side sheets, or may be bonded to the skin-facing or non-skin-facing surface of the absorber, or may be bonded to the skin of the leak-proof sheet or the back sheet. Face-to-face bonding. In addition, the joining method is not particularly limited, and any joining means using a hot-melt adhesive type adhesive, hot melting, or the like can be used.

[Absorbent body] Next, the absorbent body used in the absorbent article of the present invention will be described. In the urine absorption pad 1 of the first embodiment described above, the absorbent body 6 is arranged on the top sheet 5 and the back sheet 7 (more specifically, as shown in FIGS. 1 to 3) in the thickness direction T of the urine absorption pad 1. In other words, the absorbent member is formed between the leak-proof sheet 10) and the absorbent member for absorbing and retaining the excretory fluid of the wearer who has passed through the surface sheet 5.

As shown in FIG. 1, the absorbent body 6 extends from the abdominal region 2 (specifically, near the abdomen-side end edge portion 1A in the longitudinal direction L) of the urine absorbent pad 1 in a planar view from the planar view (specifically, In the longitudinal direction L, near the back-side end edge portion 1B), and extending from the vicinity of one side end edge portion in the width direction W of the urine absorbent pad 1 to the vicinity of the other side end edge portion in the width direction W It has an outer shape of a slightly hourglass clock shape that is formed to be long in the direction along the length direction L of the urine absorption pad 1 and that a substantially central portion in the length direction is contracted inward in the width direction. Furthermore, in the present invention, the external shape of the absorbent body (absorptive member) is not limited to such an aspect, and it may have any external shape such as a rectangular shape or an oblong shape as long as it can exhibit a predetermined absorption performance. shape.

In addition, the position in the plane viewing angle where the absorber is disposed includes the absorptivity including the intersection of the widthwise central axis C _L extending in the longitudinal direction _L and the lengthwise central axis C _W extending in the width direction W. The position of the central portion of the article is not particularly limited, and the absorbent body may be arranged to be offset from one side in the longitudinal direction of the absorbent article.

In the present invention, the absorptive member that can be used as an absorbent is not particularly limited as long as it can absorb and hold excretion such as urine, and any absorptive member known in this technical field can be used. As an example of such an absorbent member, the thing which covered the absorptive core material which consists of an absorptive material with the core material wrapping sheet, such as tissue paper which has hydrophilicity, etc. is mentioned. Examples of the absorptive material constituting the absorbent core material include hydrophilic fibers and superabsorbent polymers. More specifically, fibers such as pulverized pulp, cotton, cotton, acetate, and the like are mentioned. Plain fibers; granules made of a superabsorbent polymer such as a sodium acrylate copolymer; and a mixture of these materials in any combination.

Furthermore, in the present invention, the absorbent body may be constituted by an absorbent body having a multilayer structure in which two or more absorbent layers are laminated in the thickness direction, as in the embodiment described later. In this case, each absorbing layer can be formed by the aforementioned absorbing member. The absorber having a multilayer structure will be described in detail in another embodiment of the present invention described later.

The basis weight and thickness of the absorbent member that can be used as an absorber are not particularly limited as long as they do not hinder the effects of the present invention. Any basis weight and the like that take into account absorbency and flexibility can be used. thickness.

[Back Sheet] Next, the back sheet used in the absorbent article of the present invention will be described. In the urine absorption pad 1 of the aforementioned first embodiment, as shown in FIG. 1 to FIG. 3, the back sheet 7 is disposed on the non-skin facing surface side S ₂ in the thickness direction T of the urine absorption pad 1. A hydrophobic non-woven fabric having a predetermined air permeability and a function of preventing the excretion fluid such as urine from the wearer from passing through and preventing the excretion fluid from leaking to the outside (for example, the wearer's clothes, etc.) Or made of liquid-impermeable sheet.

As shown in FIG. 1 to FIG. 3, the back sheet 7 extends from the abdominal side edge portion 1A in the length direction L of the urine absorption pad 1 to the back side edge portion 1B in a plan view and absorbs it from the urine. One end edge portion in the width direction W of the pad 1 extends to the other end edge portion, and has a slightly hourglass-like outer shape similar to the outer shape of the urine absorption pad 1. In addition, in the present invention, the outer shape of the back sheet is not limited to such a form, and if the non-skin facing surface of the absorber arranged on the skin facing surface side of the back sheet is not exposed, it can be used for various applications. Those who adopt various arbitrary shapes and sizes.

In the present invention, the hydrophobic nonwoven fabric that can be used as a back sheet is not particularly limited as long as it has predetermined hydrophobicity and air permeability. For example, a spunbond nonwoven fabric, a dot-bonded nonwoven fabric, a meltblown nonwoven fabric, SMS Non-woven fabric (non-woven fabric composed of a multilayer structure including three or more layers (for example, a 5-layer structure) including each non-woven layer of a spunbond layer / meltblown layer / spunbond layer), and any hydrophobic non-woven fabric of hot air non-woven fabric. The hydrophobic nonwoven fabric may be provided with a leak-proof sheet between the absorbent article between the back sheet and the absorbent body, and may not be liquid-impermeable, but it does not have a leak-proof sheet between the absorbent article between the back sheet and the absorbent body. In the case of flakes, it is preferable to use a liquid-impermeable material.

The constituent fibers of the hydrophobic nonwoven fabric are not particularly limited. For example, polyolefin-based fibers such as polyethylene and polypropylene, polyester-based fibers such as polyethylene terephthalate, and core-sheath composite fibers can be used. Of various composite fibers such as thermoplastic resin fibers. In addition, the basis weight and thickness of the hydrophobic nonwoven fabric are not particularly limited as long as they do not hinder the effects of the present invention, and any basis weight and thickness in consideration of air permeability and the like can be used.

In addition, the liquid-impermeable sheet that can be used as a back sheet is not particularly limited as long as it has a predetermined liquid-impermeable property. For example, an arbitrary material such as a plastic film made of a thermoplastic resin such as polyethylene can be used. Liquid-permeable sheet. The liquid-impermeable sheet is preferably a liquid-impermeable sheet having a certain air permeability (for example, a plastic film having a plurality of openings).

In the first embodiment, the urine-absorbent pad 1 is provided between the back sheet 7 and the absorbent body 6 and has a liquid-impermeable and leak-proof sheet 10. The leak-proof sheet 10 is formed of a plastic film made of a thermoplastic resin such as polyethylene, and has a function of preventing the excretion fluid such as urine from being worn by a wearer from passing through and preventing the excretion fluid from leaking to the outside. In addition, the provision of such a leak-proof sheet is not an essential constituent element in the absorbent article of the present invention. However, if the absorbent article includes a leak-proof sheet, it is possible to effectively suppress leakage of excretory fluid such as urine. .

In the present invention, the position where the leak-proof sheet is arranged is not particularly limited as long as the function of the leak-proof sheet can be exerted, and the leak-proof sheet can be arranged from the abdomen area of the absorbent article to the entirety, as in the first embodiment. The back region may be arranged only in a specific region such as the crotch region.

Hereinafter, another embodiment (second embodiment) of the present invention that differs from the first embodiment in the structure of only the surface sheet will be described with reference to the drawings. The configuration other than the configuration different from the first embodiment is basically the same as that of the first embodiment. Therefore, the description is omitted here.

FIG. 7 is a plan view of the urine absorption pad 1 according to the second embodiment of the present invention when viewed from the surface sheet 5 side in the thickness direction T in a developed state, and FIG. 8 is a view of the urine absorption pad 1 according to the second embodiment. The enlarged section of the main part. The urine absorption pad 1 according to the second embodiment of the present invention is shown in FIGS. 7 and 8. The surface sheet 5 has an uneven structure 19 that faces the skin in the thickness direction T of the urine absorption pad 1. The opposed surface side S ₁ projects toward the non-skin facing surface side in the thickness direction T of the urine absorbing pad 1 and the ridge portion 19A protruding continuously and extending in the direction of the longitudinal direction L of the urine absorbing pad 1. S _{2 is} a recessed groove portion 19B that is recessed and continuously extends in the direction of the longitudinal direction L of the urine absorption pad 1 and is alternately arranged along the width direction W of the urine absorption pad 1.

Since the urine absorbent pad 1 of the second embodiment has a specific uneven structure 19 having a convex portion 19A and a groove portion 19B on the surface sheet 5, the surface sheet 5 includes the rib 18 of the low-friction member 14 and the surface sheet 5 ridge portion 19A and the spacer 14 can be between the surface sheet 5 functions as a low friction member can be more reliably ensure the space S _P. In addition, since the urine absorption pad 1 of the second embodiment has the groove portion 19B on the surface sheet 5, the low-friction member 14 and the surface sheet 5 can be separated more widely (that is, the aforementioned space can be secured more significantly). portion sectional area S _P in the thickness direction T), so that, absorbed 6 to be absorbed such as urine excreted liquid, moisture or the like which is difficult to reach the skin of the low-friction member 14 to the side S _1, can be Further, it is difficult to cause the wearer to feel a wet state, a stuffy state, or the like, or a state where the wearer's skin is wet.

Furthermore, in the absorbent article of the present invention, the direction in which the convex portion and the groove portion of the surface sheet extend is not limited to the aspect of the aforementioned second embodiment, and the convex portion and the groove portion may also follow the direction of the absorbent article. It extends in arbitrary directions, such as the width direction.

In the urine absorption pad 1 according to the second embodiment, the low-friction member 14 is disposed on the non-skin facing surface side S ₂ of the rib 18 as shown in FIG. The thickness direction T of 1 is overlapped with the convex portion 19A of the surface sheet 5. In this way, if the front end portion 18T of the rib portion 18 of the low-friction member 14 overlaps with the ridge portion 19A of the surface sheet 5 in the thickness direction T, the low-friction member 14 and the surface sheet 5 can be separated more significantly. Therefore, excretory fluid such as urine and moisture absorbed by the absorbent body 6 are less likely to reach the skin-facing surface side S _{1 of the} low-friction member 14. Thereby, the urine absorbing pad 1 of the second embodiment can more effectively and surely exert the aforementioned effects (that is, it is more difficult for the wearer to feel a wet state, a stuffy state, etc., or the wearer's The effect of the skin getting wet).

In the urine absorption pad 1 of the second embodiment, the low-friction member 14 is disposed so that the end portion 18T located on the non-skin facing surface side S ₂ of the rib portion 18 is in the thickness direction T of the urine absorption pad 1. It is the same as the convex part 19A of the surface sheet 5, but in the absorbent article of this invention, the arrangement form of a low-friction member is not limited to such a form. Here, FIG. 9 is an enlarged sectional view of a main part of a modified example of the urine absorption pad 1 according to the second embodiment of the present invention. In addition, in FIG. 9, the configuration other than the configuration different from the aforementioned second embodiment is basically the same as that of the aforementioned second embodiment, and therefore description thereof is omitted here.

In the modification of FIG. 9, as shown in FIG. 9, the low-friction member 14 is disposed so that the end portion 18T located on the non-skin facing surface side S ₂ of the rib portion 18 is in the thickness direction T of the urine absorption pad 1. It is the same as the groove part 19B of the surface sheet 5. In this way, if the front end portion 18T of the rib portion 18 of the low friction member 14 overlaps with the groove portion 19B of the surface sheet 5 in the thickness direction T, the surface of the rib portion 18 can be restricted by the groove portion 19B of the surface sheet 5. the moving direction, and therefore, more stable and can be surely secured between the surface 14 is formed on the sheet 5 and the space portion S _P of the low-friction member.

Furthermore, in the present invention, the uneven structure of the surface sheet is a ridge portion that protrudes toward the skin-facing surface side in the thickness direction of the absorbent article and extends continuously in a predetermined first direction, and in the thickness direction. If the concave-convex structure which is recessed toward the non-skin facing surface side and extends continuously in the first direction is alternately arranged along a second direction orthogonal to the first direction, the non-skin facing surface side structure It is not particularly limited, and may be formed to be slightly flat like the second embodiment described above, or a groove portion and a convex portion (that is, formed along the surface sheet) may be formed corresponding to the convex portion and the groove portion. The cross-section structure in 2 directions is slightly wavy).

The method of applying a concave-convex structure to the surface sheet is not particularly limited, and for example, an arbitrary shaping method such as a method of continuously blowing a gas (for example, air) on a fiber web, a compression molding method, or a gear extension method can be adopted.

Hereinafter, another embodiment (third embodiment) of the present invention, which is different from the first embodiment only, in the absorbent sheet which is provided, will be described with reference to the drawings. The configuration other than the configuration different from the first embodiment is basically the same as that of the first embodiment. Therefore, the description is omitted here.

FIG. 10 is a plan view of the urine absorption pad 1 according to the third embodiment of the present invention, as viewed from the surface sheet 5 side in the thickness direction T in a developed state, and FIG. 11 (a) is a urine absorption of the third embodiment. The main part of the pad 1 is an enlarged cross-sectional view, and FIG. 11 (b) is an enlarged cross-sectional view of the main part showing the state in which the urine absorbing pad 1 of the third embodiment has absorbed the excretion fluid. The urine absorption pad 1 according to the third embodiment of the present invention, as shown in FIG. 10 and FIG. 11 (a), is provided between the surface sheet 5 and the absorbent body 6 and has an absorbency containing a highly absorbent polymer.片 20。 Thin sheet 20.

As shown in FIG. 10, the absorbent sheet 20 has a predetermined longitudinal length (for example, 100 mm to 200 mm) extending from the crotch region 3 of the urine absorption pad 1 to the back region 4 in a plan view, and The width direction W is extended to cover a large part of the predetermined width direction length (for example, 100 mm to 200 mm) of the absorbent body 6 and has a substantially rectangular outer shape that is longer than the length direction L. Furthermore, in the absorbent article of the present invention, the outer shape of the absorbent sheet is not limited to this aspect, and any outer shape (for example, circular, oval, polygonal, etc.) can be adopted according to the desired absorption performance and the like. .

In the urine absorption pad 1 according to the third embodiment, the absorbent sheet 20 extends from the crotch region 3 of the urine absorption pad 1 in a plan view as shown in Figs. 10 and 11 (a). In the back region 4, the back region 4 is arranged to overlap the low friction member 14 in the thickness direction T. If the absorbent sheet 20 is disposed so as to overlap the low-friction member 14 in the thickness direction T, the absorbent sheet 20 (more specifically, the superabsorbent polymer contained in the absorbent sheet 20) absorbs urine. when liquid such as liquid waste, the absorbent sheet 20 expands toward the surface sheet 5 to the skin surface S ₁ side is pushed up, as shown in FIG 11 (b), the form of the rib 18 becomes easy low-friction member 14 The front-end | tip part 18T is in the state which entered the inside of the surface sheet 5. With this, the urine absorption pad 1 according to the third embodiment can prevent the ribs 18 of the low-friction member 14 from moving or deforming easily even after absorbing the excretion liquid such as urine, and can be more stable and reliable. forming the space portion S _P. In addition, the urine absorption pad 1 according to the third embodiment can exhibit more excellent absorption performance by including the absorbent sheet 20 described above.

In the present invention, the absorptive sheet is not particularly limited as long as it is a sheet-like member containing a highly absorptive polymer, and examples thereof include superabsorptive properties such as covering a sodium acrylate copolymer with a coating sheet such as tissue paper having hydrophilicity. Polymers and so on. The absorbent sheet may contain the same absorbent material as the absorbent except for the superabsorbent polymer.

The basis weight and thickness of the absorptive sheet are not particularly limited as long as they do not hinder the effects of the present invention. Any basis weight and thickness that take into account desired absorption performance, flexibility, and the like can be used.

Next, another embodiment (fourth embodiment) of the present invention which differs from the first embodiment in the structure of only the absorber will be described with reference to the drawings. The configuration other than the configuration different from the first embodiment is basically the same as that of the first embodiment. Therefore, the description is omitted here.

FIG. 12 is a plan view of the urine absorption pad 1 according to the fourth embodiment of the present invention when viewed from the surface sheet 5 side in the thickness direction T in a developed state, and FIG. 13 is a view of the urine absorption pad 1 according to the fourth embodiment. 12 is a partial cross-sectional view taken along the line XIII-XIII of FIG. 12, and FIG. 14 is a partial cross-sectional view taken along the line XIV-XIV of the urine absorption pad 1 of the fourth embodiment. The urine absorption pad 1 according to the fourth embodiment of the present invention is as shown in FIGS. 12 to 14. The absorbent body 6 is provided with an absorption layer 61 located on the skin-opposing surface side S ₁ in the thickness direction T, and The non-skin-facing surface side S ₂ is the lower absorption layer 62. The upper absorbent layer 61 has a slightly hourglass shape in a plan view, and has a slightly hourglass shape that is long in the direction L along the length direction L of the urine absorbent pad 1 and narrowed toward the inner side of the crotch region 3 in the width direction. In addition, the lower absorption layer 62 has a width direction length that is longer in the direction of the longitudinal direction L of the urine absorption pad 1 in a planar viewing angle and is smaller than the minimum width direction length of the upper absorption layer 61. A slightly rectangular shape.

The upper-side absorption layer 61 has the groove part 61S which extends in the said crotch region 3 and extends along the longitudinal direction L, and penetrates the upper-side absorption layer 61 in the thickness direction T. As shown in FIG. The upper groove portion 61S is located in the crotch region 3 of the urine absorption pad 1 as shown in FIG. 12 and passes through the center of the width direction W of the absorbent body 6 (that is, the width direction central axis C _L extending in the length direction L _). Top) and extends in the longitudinal direction L. As described above, since the upper groove portion 61S is formed at a position corresponding to the supply position of the excretion liquid such as urine discharged from the wearer, the excretion liquid such as urine discharged from the wearer is placed on the surface sheet 5. Before diffusion (that is, the skin-opposing surface of the urine absorption pad 1 hardly stained), it can be quickly sucked into the inside of the lower absorption layer 62 through the upper groove portion 61S.

Further, in the fourth embodiment, the lower absorption layer 62 includes: the crotch region 3 extending along the longitudinal direction L and penetrating the lower absorption layer 62 in the thickness direction T to the lower groove portion 62S. The lower groove portion 62S is located in the crotch region 3 of the urine absorbing pad 1 as shown in FIG. 12 and passes through the center of the width direction W of the absorbent body 6 (that is, the width direction central axis C _L extending in the length direction L _). (Upper) and extends in the length direction L, and is formed to overlap with the aforementioned upper groove portion 61S in the thickness direction T (that is, repeat in a plane viewing angle). Therefore, the excreted liquid such as urine can be quickly sucked into the lower absorption layer 62 through the upper groove portion 61S of the upper absorption layer 61 and the lower groove portion 62S of the lower absorption layer 62. The lower absorption layer has a lower groove portion that penetrates the lower absorption layer in the thickness direction. It is not an essential component in the absorbent article of the present invention. The lower absorption layer may not have the lower groove portion described above, or it may The recessed portion which is a skin-facing side from the lower absorption layer to a non-skin-facing side is formed in a recessed direction in a thickness direction.

Further, in the fourth embodiment, the upper groove portion 61S and the lower groove portion 62S are formed so that their positions coincide with each other in a plane viewing angle (that is, the two groove portions communicate with each other in the thickness direction). Therefore, the absorber 6 is formed with a groove portion 6S formed by overlapping the upper groove portion 61S and the lower groove portion 62S in the thickness direction T. With this, in the fourth embodiment, the absorbent body 6 can not only pass the excreted liquid such as urine that has been discharged through the upper groove portion 61S of the upper absorption layer 61 and the lower groove portion 62S of the lower absorption layer 62, but quickly The inside of the lower absorption layer 62 is sucked in, and the upper absorption layer 61 is interposed therebetween, so that it is difficult for the excretion liquid such as urine absorbed by the lower absorption layer 62 to flow back.

The length direction L length and the width direction W length of the upper groove portion 61S and the lower groove portion 62S in the plane view (hereinafter, the length of the groove portion is referred to as [length] only, and the width of the groove portion is referred to as [width] only) From the viewpoints of desired absorption performance, flexibility, etc., any size may be adopted in consideration of the size of the upper absorption layer 61 and the lower absorption layer 62 and the like. For example, the width of the upper groove portion 61S is generally in a range of 5.0 to 50 mm, and preferably in a range of 10 to 20 mm. Similarly, the width of the lower groove portion 62S is equal to or narrower than the width of the upper groove portion 61S, and is generally in a range of 5.0 to 40 mm, and preferably in a range of 10 to 15 mm. The length of the upper groove portion 61S is generally within a range of 50 to 300 mm, preferably within a range of 50 to 200 mm, and more preferably within a range of 50 to 150 mm. Similarly, the length of the lower groove portion 62S is equal to or shorter than the length of the upper groove portion 61S, and is generally within a range of 30 to 250 mm, and preferably within a range of 30 to 150 mm. The width and length of the upper groove portion 61S are equal to or larger than the width and length of the lower groove portion 62S, so that even in the process of laminating the upper absorption layer 61 and the lower absorption layer 62, the operation at the time of wearing is slightly generated. The offset can also keep the size of the groove portion 6S in the planar viewing angle of the absorbent body 6 substantially constant. In addition, since a step is generated on the inner wall surface of the groove portion 6S, the inner surface area of the groove portion 6S is increased, so that the absorption performance of the absorber 6 in the portion where the groove portion 6S is formed can be improved.

Here, the groove portion 6S of the absorber 6 according to the fourth embodiment will be described in more detail. As shown in FIGS. 13 and 14, the upper-layer groove portion 61S is provided with a pair of wall surfaces arranged along the length direction L and facing each other in the width direction W, that is, one of the side end portions WU1 in the width direction W The wall surface SU1 and the wall surface SU2 of the other side end portion WU2 in the width direction W; and a pair of wall surfaces arranged along the width direction W and facing each other in the length direction L, that is, the abdominal side ends in the length direction L The wall surface FWU of the portion LU1 and the wall surface BWU of the back-side end portion LU2 in the length direction L, and the lower groove portion 62S includes a pair of wall surfaces arranged along the length direction L and facing each other in the width direction W. That is, the wall surface SL1 of one side end portion WL1 in the width direction W and the wall surface SL2 of the other side end portion WL2 in the width direction W; and one pair of wall surfaces arranged along the width direction W and facing each other in the length direction L. That is, the wall surface FWL of the abdominal side end portion LL1 in the length direction L and the wall surface BWL of the back side end portion LL2 in the length direction L. Note that in FIG. 13, the left side is the front side (abdominal side) in the longitudinal direction L, and the right side is the back side (back side) in the longitudinal direction L. In addition, the imaginary bottom surface BU of the upper groove portion 61S is a plane on which the non-skin-facing surface of the upper absorption layer 61 faces the imaginary extension of the upper groove portion 61S as a through hole. Similarly, the imaginary bottom surface BL of the lower-layer groove portion 62S is a plane on which the non-skin-facing surface of the lower absorption layer faces an imaginary extension of the lower-layer groove portion 62S as a through hole. Therefore, the virtual plane BU of the upper groove portion 61S and the virtual plane BL of the lower groove portion 62S are in a mutually parallel relationship.

In the urine-absorbent pad 1 of the fourth embodiment, as shown in FIGS. 12 and 13, between the abdominal-side end portion LL1 in the longitudinal direction L of the lower groove portion 62S and the abdominal-side end edge portion 1A of the urine-absorbent pad 1. The distance is shorter than the distance between the back-side end portion LL2 in the longitudinal direction L of the lower groove portion 62S and the back-side end edge portion 1B of the urine absorption pad 1. In the urine absorption pad 1 according to the fourth embodiment, as shown in FIG. 13, the angle formed by the wall surface FWL of the abdominal side end portion LL1 in the longitudinal direction L of the lower groove portion 62S and the imaginary bottom surface BL of the lower groove portion 62S. β1 is formed at an angle β2 which is closer to the virtual bottom surface BL than the angle β2 formed by the wall surface BWL of the back side end portion LL2 in the longitudinal direction L of the lower layer groove portion 62S and the imaginary bottom surface BL of the lower layer groove portion 62S. For example, if the wearer adopts a posture such as standing or sitting, if the excretion fluid such as urine discharged from the wearer leaks from the abdominal side end LL1 in the longitudinal direction L of the lower groove portion 62S, The leaked excretion fluid tends to flow through the upper groove portion 61S toward the abdominal-side end edge portion 1A of the urine-absorbent pad 1. However, by forming the lower groove portion 62S as described above, the length of the lower groove portion 62S in the longitudinal direction L can be increased. The excretion fluid such as urine leaking from the abdominal side end portion LL1 does not easily face the abdominal side end edge portion 1A of the urine absorption pad 1.

In the urine absorption pad 1 according to the fourth embodiment, as shown in FIGS. 12 and 13, the abdominal side end portion LU1 in the longitudinal direction L of the upper groove portion 61S and the abdominal side end edge portion of the urine absorption pad 1 The distance between 1A is shorter than the distance between the back-side end portion LU2 in the longitudinal direction L of the upper groove portion 61S and the back-side end edge portion 1B of the urine absorption pad 1. Further, in the urine absorption pad 1 according to the fourth embodiment, as shown in FIG. 13, the angle formed by the wall surface FWU of the abdominal side end LU1 in the longitudinal direction L of the upper groove portion 61S and the imaginary bottom surface BU of the upper groove portion 61S. α1 is formed at an angle α2 which is closer to the hypothetical bottom surface BU than the angle α2 formed by the wall surface BWU of the back side end portion LU2 in the longitudinal direction L of the upper layer groove portion 61S and the hypothetical bottom surface BU of the upper layer groove 61S. If the upper groove portion 61S is formed in this way, similarly to the aforementioned lower groove portion 62S, when the wearer adopts a posture such as standing or sitting, it can leak from the abdominal side end LU1 in the longitudinal direction L of the upper groove portion 61S. It is difficult for the excretion fluid such as urine to be directed toward the abdominal edge end edge portion 1A of the urine absorption pad 1.

In the urine absorption pad 1 according to the fourth embodiment, as shown in FIGS. 13 and 14, the angle formed by each of the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove portion 62S and the imaginary bottom surface BL of the lower groove portion 62S. β1, β2, β3, and β4 are formed at angles α1, α2, α3, and α4 formed from the respective walls FWU, BWU, SU1, and SU2 of the upper groove portion 61S and the imaginary bottom surface BU of the upper groove portion 61S. BL is closer to vertical and becomes steeper. In other words, the wall surfaces FWU, BWU, SU1, and SU2 of the upper layer groove portion 61S are formed more smoothly on the imaginary bottom surfaces BL and BU of the groove portion 6S than the wall surfaces FWL, BWL, SL1, and SL2 of the lower layer groove portion 62S. Therefore, in the urine absorption pad 1 of the fourth embodiment, the wall surfaces FWU, BWU, SU1, and SU2 of the upper ditch portion 61S are formed relatively smoothly. Therefore, the upper ditch portion 61S can rapidly excrete urine and the like. It is sucked into the lower groove portion 62S, and the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove portion 62S are formed steeply. Therefore, it is possible to make it difficult for the excretion fluid such as urine once sucked into the lower absorption layer 62 to flow back.

Further, in the urine absorption pad 1 according to the fourth embodiment, as shown in FIGS. 12 to 14, one of the lateral end portions WU1 in the width direction W of the upper groove portion 61S and the width direction W of the urine absorption pad 1 The distance between one side end edge portion and the distance between the other side end portion WU2 in the width direction W of the upper groove portion 61S and the other side end edge portion in the width direction W of the urine absorption pad 1 are related The distance between the abdominal side end portion LU1 in the longitudinal direction L of the upper groove portion 61S and the abdominal side end edge portion 1A in the longitudinal direction L of the urine absorption pad 1 and the back side in the longitudinal direction L of the upper groove portion 61S The distance between the end portion LU2 and the back-side end edge portion 1B in the longitudinal direction L of the urine absorption pad 1 is short. Furthermore, in the urine absorption pad 1 of the fourth embodiment, as shown in FIGS. 12 and 13, each of the wall surfaces SU1 and W1 of the one side end WU1 and the other side end WU2 in the width direction W of the upper groove portion 61S. The angles α3 and α4 formed by SU2 and the imaginary bottom surface BU of the upper ditch portion 61S are formed to be greater than the angle α1 formed by the wall surface FWU of the abdominal side end LU1 in the longitudinal direction L of the upper ditch portion 61S and the imaginary bottom surface BU of the upper ditch portion 61S. The angle α2 formed by the wall surface BWU of the back side end portion LU2 in the longitudinal direction L of the upper layer groove portion 61S and the imaginary bottom surface BU of the upper layer groove portion 61S is closer to the imaginary bottom surface BU and becomes steeper. Since the urine absorption pad 1 according to the fourth embodiment has the upper groove portion 61S having the specific structure described above, excretion liquid such as urine discharged from the wearer can easily reach the lower side through the upper groove portion 61S. The absorbent layer 62 can preferentially diffuse the excretory liquid in the longitudinal direction L even when the excretory liquid temporarily collects in the upper-layer groove portion 61S. Thereby, the urine absorption pad 1 according to the fourth embodiment can not only efficiently absorb the excretion liquid such as urine in a wide area in the longitudinal direction L of the absorbent body 6, but also interpose the upper side absorbent layer 61 It makes it difficult for the excretion fluid absorbed by the lower absorbent layer 62 to flow back. Therefore, the excretion fluid such as urine and its moisture cannot easily contact the wearer's skin, and it is more difficult to produce a wet state for the wearer. , Sultry, or wet condition on the wearer's skin.

The angles α1 to α4 and β1 to β4 formed by each wall surface and each imaginary bottom surface of the groove portion can be obtained by the following measurement methods. First, a 20 × 40 mm sample for measurement is taken from the absorbent article to be measured with the groove as the center. Next, an X-ray fluoroscopy device FLEX-M863 made by BEAMSENSE was used to scan the measurement sample by 0.2 degrees every 0.2 degrees, and image the images at each angle. Then, the 1800 images taken are connected and combined to create a 3D image. Then, the cross-sectional view in the longitudinal direction L and the cross-sectional view in the width direction W are taken from the 3D image thus prepared, and the angles α1 to α4 and β1 to β4 are measured from the cross-sectional views.

The present invention is applicable to various absorbent articles such as (slight) incontinence pads, disposable diapers, etc., in addition to the urine absorbent pads of the foregoing embodiments. In addition, the absorbent article of the present invention is not limited to the aforementioned embodiments, modifications thereof, and the like, and may be appropriately combined, substituted, changed, and the like without departing from the scope of the object and technical idea of the present invention. Moreover, in this specification, the serial numbers of [No. 1], [No. 2], etc. are used to distinguish the items assigned with such serial numbers, and are not used to mean the order, priority, and importance of each item. [Example]

Hereinafter, the present invention will be described more specifically with examples and comparative examples. However, the present invention is not limited to these examples.

Example 1 (1) Production of low-friction members A master batch composed of 50% by mass of high-density polyethylene (HDPE) and 50% by mass of low-density polyethylene, an oxidation inhibitor, and a slip agent were put into an extruder, and After melt-kneading is performed in the extruder, the molten mixture in the extruder is extruded into a sheet shape through a T die, thereby obtaining a sheet-shaped molded article. And just after extruding this sheet-like shaped article, it is supplied along the surface of the suction drum covered by the mesh material, and the suction force of the suction drum is sucked while rotating, and the semi-melted state The sheet-shaped molded article forms a plurality of openings along the opening pattern of the mesh material, and forms ribs protruding from the opening peripheral edge portion of the openings. In addition, this semi-molten sheet-like shaped article is cooled and solidified by suction by a suction drum and a cooling roller in a subsequent process, thereby obtaining a specific rib having the specific ribs shown in Table 1 below. A polyethylene sheet (low friction member) having a plurality of openings. (2) Production of absorbent article The surface of the rib protruding side of the two surfaces of the obtained polyethylene sheet (low-friction member) (that is, when placed on an absorbent article, it is non-skin-facing. The surface on the front side) is coated with a hot-melt adhesive, and the low-friction member is bonded to a surface sheet (hydrophilic hot air nonwoven fabric with a basis weight of 25 g / m ² ) and an intermediate sheet (a base weight of 15 g / m ² in that order). Tissue), absorber (by combining a pulp having a basis weight of 300 g / m ² and a super absorbent polymer on a basis weight of 110 g / m ^{2 and} an upper absorbent layer, and a pulp having a basis weight of 215 g / m ² and a basis weight of 80 g / m ² of superabsorbent polymer layered absorbent layer under the absorbent layer) and back sheet (liquid-impermeable film with a basis weight of 22 g / m ² ) of the absorbent article precursor of the skin sheet On the surface facing the surface, an absorbent article of Example 1 was obtained. In addition, in this embodiment, as described later, the absorbent article evaluates the reflow characteristics and the like of the portion where the low-friction member is disposed, and therefore, the cover sheet is not disposed.

Examples 2 and 3 The absorbent articles of Examples 2 and 3 were obtained in the same manner as in Example 1 except that the low-friction member was changed to the structure shown in Table 1 below.

Comparative Example 1 An absorbent article of Comparative Example 1 was obtained in the same manner as in Example 1 except that a nylon-made sheet having no ribs in the opening portion was used as a low-friction member.

Comparative Example 2 An absorbent article of Comparative Example 2 was obtained in the same manner as in Example 1 except that the low-friction member was disposed so that the ribs projected toward the skin-facing surface side.

For each of the obtained absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 2, the friction characteristics and reflow characteristics of the portion where the low-friction member was arranged were evaluated. Therefore, the following <static friction coefficient and dynamic friction coefficient were evaluated. The measuring method is to measure the friction coefficient of the surface of the skin-facing surface of the low-friction member, and to measure the return flow of the portion where the low-friction member is arranged by the following <measurement method of the return flow>. The composition of the low-friction member, the respective friction coefficients, and the measurement results of the return flow are shown in Table 1 below.

<Methods for measuring the coefficient of static friction and coefficient of dynamic friction> (1) A cover sheet for an absorbent article is prepared separately. A weight of 1 kg with a bottom surface size of 50 mm × 50 mm is mounted on the cover sheet, and an adhesive is applied to the bottom surface. Then, the cover sheet and the weight are followed. (2) A low-friction member made of an absorbent article to be used for measurement is placed on a horizontal surface such that the surface on the skin-opposing surface side faces upward. (3) With the counterweight positioned above, the cover sheet with the aforementioned 1kg counterweight is placed on the low-friction member that has been placed on a horizontal surface. (4) Using an arbitrary friction tester, pull the weight at a speed of 100 mm / min in a direction parallel to the horizontal plane and corresponding to the length direction of the absorbent article, and measure when the weight is about to move and after it has been moved For each coefficient of friction, the coefficient of friction is used as the coefficient of static friction and the coefficient of dynamic friction.

<Measurement method of return flow rate> (1) A cylinder (inner diameter of 60 mm, weight of 550 g) is placed at the artificial urine dropping position (that is, flat surface) of an absorbent article (hereinafter referred to as "measurement sample") to be measured. The central portion of the low-friction member in the viewing angle), at a speed of 150 ml / 15 sec, 150 ml of artificial urine was dropped from a dropper at a position of about 10 mm above the measurement sample at a substantially central portion of the cylinder. 150 ml of this artificial urine was dropped twice every 5 minutes, and a total of 300 ml of artificial urine was dropped to the measurement sample.人工 The artificial urine used for this measurement was prepared by dissolving 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate, 3 g of calcium chloride, and about 1 g of pigment (cyan 1) in 10 L of ion-exchanged water. (2) After putting a total of 300ml of artificial urine for 5 minutes, place 70g of filter paper (100mm × 100mm) at the position where the artificial urine drips, and further load 3.5kg of 100mm × 100mm bottom surface on it. After weighting, the filter paper absorbs artificial urine exuding from the measurement sample. (3) After standing for 3 minutes, the weight of the filter paper which absorbed artificial urine was measured. Then, the weight (g) of artificial urine absorbed by the filter paper is calculated by subtracting the weight of the filter paper before absorbing artificial urine from the weight of the filter paper absorbing artificial urine, and this weight is taken as the return flow (g). .

As shown in Table 1, it can be seen that the absorbent articles of Examples 1 to 3 provided with the low-friction members having ribs protruding toward the non-skin-facing surface side, the low-friction members have a low coefficient of friction on the skin-facing surface. , Can maintain the low friction of the low friction member (that is, the state of the friction resistance between the cover sheet and the low friction member is small), and can reduce the return flow. Moreover, the absorbent article of the comparative example 1 provided with the low-friction member which does not have a rib part has a low coefficient of friction of the skin-facing surface of a low-friction member, but a large return flow. In addition, the absorbent article of Comparative Example 2 provided with a low-friction member having ribs protruding toward the skin-opposing surface side. As a result, the coefficient of friction of the skin-opposing surface of the low-friction member was significantly high, and the return flow rate was also high. many.

1‧‧‧ Urine absorbent pad (absorbent article)

1A‧‧‧ Abdominal side edge

1B‧‧‧Back side edge

2‧‧‧ Abdominal area

3‧‧‧ Tomb area

4‧‧‧ back area

5‧‧‧ surface sheet

6‧‧‧ Absorber

7‧‧‧ back sheet

8‧‧‧ one side side sheet

8L‧‧‧outer edge

8R‧‧‧ inside edge

8S‧‧‧ inside part

9‧‧‧ the other side sheet

9L‧‧‧ inside edge

9R‧‧‧Outer edge

9S‧‧‧ inside part

10‧‧‧Leak-proof sheet

11‧‧‧ Elastic member

12‧‧‧ Leak-proof wall

13‧‧‧ Cover sheet

13B‧‧‧Back side edge

13L‧‧‧One side end

13R‧‧‧The other side end

14‧‧‧low friction member

15‧‧‧Joint

16‧‧‧ opening

17‧‧‧ opening periphery

18‧‧‧ rib

19‧‧‧ Bump structure

20‧‧‧ Absorbent sheet

FIG. 1 is a plan view of a urine absorbent pad according to a first embodiment of the present invention as viewed from the surface sheet side in the thickness direction in a developed state. FIG. 2 is a cross-sectional view of the urine absorption pad of the first embodiment of the present invention, taken along the line II-II in FIG. 1. FIG. 3 is a cross-sectional view of the urine absorption pad of the first embodiment of the present invention, taken along the line III-III of FIG. 1. FIG. 4 is an enlarged sectional view of a main part of the urine absorption pad shown in FIG. 2. 5 is a perspective view of a low-friction member used in the urine absorbing pad according to the first embodiment of the present invention. Fig. 6 is an enlarged sectional view of a main part of a modified example of the urine absorbing pad according to the first embodiment of the present invention. FIG. 7 is a plan view of the urine absorbent pad according to the second embodiment of the present invention as viewed from the surface sheet side in the thickness direction in a developed state. 8 is an enlarged cross-sectional view of a main part of a urine absorption pad according to a second embodiment of the present invention. 9 is an enlarged sectional view of a main part of a modified example of the urine absorbing pad according to the second embodiment of the present invention. FIG. 10 is a plan view of the urine absorbent pad according to the third embodiment of the present invention as viewed from the surface sheet side in the thickness direction in a developed state. Fig. 11 (a) is an enlarged sectional view of a main part of a urine absorption pad according to a third embodiment of the present invention, and Fig. 11 (b) is a diagram showing a urine absorption pad according to the third embodiment of the present invention after absorbing the excretion fluid; The enlarged section of the main part of the state. FIG. 12 is a plan view of the urine absorbent pad according to the fourth embodiment of the present invention as viewed from the surface sheet side in the thickness direction in a developed state. Fig. 13 is a partial cross-sectional view of a urine absorption pad according to a fourth embodiment of the present invention, taken along the line XIII-XIII in Fig. 12. Fig. 14 is a partial cross-sectional view of a urine absorption pad according to a fourth embodiment of the present invention, taken along the line XIV-XIV in Fig. 12.

Claims (15)

An absorbent article is provided with a surface sheet and an absorbent body located on the non-skin facing surface side of the surface sheet, and has a length direction, a width direction, and a thickness direction, and is characterized in that: the foregoing absorbent article is in a plane viewing angle Having an abdomen region, a back region, and a crotch region located between the two regions in the length direction; the absorbent article is at least in the back region, and further includes: the skin facing side of the surface sheet and A low-friction member having a plurality of openings penetrating in the thickness direction; and a cover sheet located on the skin-opposing surface side of the low-friction member; each of the plurality of openings has an opening periphery on the skin-opposing surface side; A rib portion protruding from the peripheral edge portion of the opening toward the non-skin-facing surface side. For example, if the absorbent article in the first scope of the patent application, the aforementioned rib is a product of the height (h _r ) and thickness (t _r ) of the rib is 2.0 × 10 ^-3 mm ² to 5.0 × 10 ^-3 mm ² range. For example, the absorbent article according to item 1 or 2 of the patent application scope, wherein the skin-facing surface of the peripheral portion of the opening is curved toward the non-skin-facing surface. For example, in the absorbent article according to the first patent application scope, the rigidity of the end portion of the rib portion located on the non-skin facing surface side is higher than the rigidity of the peripheral edge portion of the opening. For example, in the absorbent article according to claim 1, the front end portion of the ribs located on the non-skin facing surface side is located inside the surface sheet. For example, the absorbent article according to the first patent application range, wherein the surface sheet has a concavo-convex structure that protrudes toward the skin-opposing surface side in the thickness direction of the absorbent article and faces a predetermined first direction. The ridge portion extending continuously and the groove portion which is recessed toward the non-skin-facing surface side in the thickness direction and continuously extends in the first direction alternately along a second direction orthogonal to the first direction. Configuration. For example, in the absorbent article according to claim 6 of the patent application scope, the front end portion of the rib portion located on the non-skin-facing surface side is in the thickness direction and overlaps the convex portion. For example, in the absorbent article according to item 6 of the patent application, the front end portion of the rib portion located on the non-skin facing surface side is in the thickness direction and overlaps the groove portion. For example, the absorbent article according to the first patent application range, wherein the absorbent article is further provided between the surface sheet and the absorbent body, and also includes an absorbent sheet containing a superabsorbent polymer. The thickness direction is the same as that of the aforementioned low-friction member. For example, the absorbent article according to the first patent application range, wherein the absorption system includes an upper absorption layer located on the skin facing surface side and a lower absorption layer located on the non-skin facing surface side, and the upper absorption layer has : In the region of the crotch portion, extending along the length direction and penetrating the upper absorption layer in the thickness direction to the upper groove portion, one of the upper side groove portion in the width direction and the other side end The angle formed by each wall surface and the imaginary bottom surface of the upper groove portion is closer to the vertical than the angle formed by each wall surface of the abdominal side end portion and the back side end portion in the longitudinal direction and the imaginary bottom surface of the upper groove portion. For example, in the absorbent article according to claim 1, the low-friction member is formed of a resin-made sheet-like member containing high-density polyethylene at a ratio of 50% by mass or more. For example, the absorbent article according to claim 11 of the application, wherein the resin sheet-like member contains the high-density polyethylene and low-density polyethylene in a mass ratio in the range of 50/50 to 75/25. For example, in the absorbent article according to the first patent application range, the surface sheet and the low-friction member are at least partially bonded with a low-adhesive adhesive having a measured value of 0.78 N or less through a probe adhesion test. In the absorbent article according to the first patent application range, the low-friction member is formed by a resin-made sheet-like member that is displaced toward the skin-opposing surface side at both end portions in the width direction. For example, the absorbent article in the scope of patent application, wherein the absorbent article has at least one fold line, which extends in the width direction and is used to fold the absorbent article in the unfolded state toward the length direction. The low-friction member is arranged at a position where it does not overlap the above-mentioned fold line in a plan view.