JP7107203B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers, pads, and sanitary napkins.

2. Description of the Related Art Conventionally, an absorbent article is provided with an absorbent body extending in the longitudinal direction connecting the abdominal side and the back side of a wearer, as disclosed in Patent Literature 1, for example. This absorber absorbs excreted fluids such as urine and menstrual blood. By arranging this absorbent body between a liquid-permeable sheet and a liquid-impermeable sheet, the absorbent article absorbs urine excreted on the liquid-permeable sheet with the absorbent body. A liquid-impermeable sheet prevents leakage of absorbed urine.

WO2016/114209

A nonwoven fabric, for example, is used for the liquid-permeable sheet. Nonwoven fabrics are suitable as materials for sheets that come in contact with the wearer's skin because they can achieve a soft touch. In addition to urine and menstrual blood, the excretion from the wearer includes, for example, watery stool. Watery stool is a mixture of solids and liquids and has fluidity. In the absorbent article, if the liquid of watery feces cannot be absorbed by the absorbent body and fluid watery feces remains on the liquid-permeable sheet, there is a risk that the watery feces will leak to the outside. be.

Accordingly, an object of the present invention is to provide an absorbent article capable of suppressing leakage.

In order to solve the above-mentioned problems, in the present invention, the liquid-permeable sheet member covering the skin surface side of the absorbent body includes an upper sheet arranged on the skin surface side and an upper sheet layered on the upper sheet and arranged on the absorbent body side. a lower sheet; A valve portion defined by a curved cut penetrating through the upper sheet in the thickness direction and connected to the upper sheet by an uncut portion connecting both ends of the cut is joined to the lower sheet.

Specifically, the present invention is an absorbent article comprising an absorbent body and a liquid-permeable sheet member covering the skin side of the absorbent body, wherein the sheet member is arranged on the skin side. and a lower sheet superimposed on the upper sheet and arranged on the absorbent body side, and are defined by curved cuts penetrating the upper sheet in the thickness direction. A valve portion that is connected to the upper sheet by an uncut portion that connects both ends, and is formed by joining the valve portion to the lower sheet to form the skin surface side of the upper sheet, the upper sheet, and the lower side. a space formed between the sheets and a hole communicating with the space.

In the absorbent article, the front body region covers the abdomen of the wearer, the back body region covers the back of the wearer, and the crotch region lies between the front body region and the back body region and covers the crotch of the wearer. wherein the seat member is arranged across the front body region and the back body region, and the valve portion is located in the crotch region of the upper sheet and is in contact with the wearer's anus A first region on the front body region side of the contact position and a second region of the upper sheet on the back body region side of the anus contact position are formed in plurality, and The valve portion is formed such that the uncut portion faces the back body region side, and the valve portion in the second region is formed such that the uncut portion faces the front body region side. good too.

In the absorbent article, the absorbent article is arranged on the upper sheet so as to expand and contract between the first region and the second region while being stretched in a direction connecting the front body region and the back body region. A stretchable member may be provided, and the upper sheet may shrink in the first region in the direction of the back body region and in the second region in the direction of the front body region by contraction of the stretchable member. .

In the absorbent article, in a state of being stretched in a direction connecting the front body region and the back body region, the lower side is stretched around a position corresponding to the space between the first region and the second region. A stretchable member arranged on the sheet is provided, and the lower sheet shrinks in the direction of the back body region in the region corresponding to the first region by contraction of the stretchable member, and corresponds to the second region. The region may contract in the direction of said front body region.

In the absorbent article, the cut may be substantially C-shaped.

According to the present invention described above, leakage can be suppressed.

FIG. 1 is a perspective view of an underpants-type disposable diaper according to an embodiment. FIG. 2 is an exploded perspective view of the diaper according to the embodiment. FIG. 3 is a diagram schematically showing an unfolded and extended state of the diaper according to the embodiment. FIG. 4 is a diagram showing the relationship between the intervals between the rubber threads and the ventilation paths appearing in the waist gathers. FIG. 5 is a diagram showing the center sheet of the diaper according to the embodiment. FIG. 6 is a diagram showing valve portions formed in the center sheet of the diaper according to the embodiment. FIG. 7 is a diagram showing the center sheet of the diaper according to the embodiment. FIG. 8 is a diagram showing the center sheet of the diaper according to the embodiment. FIG. 9 is a diagram showing the lower sheet of the center sheet of the diaper according to the embodiment.

Embodiments of the present invention will be described below. The embodiments shown below are examples of embodiments of the present invention, and the technical scope of the present invention is not limited to the following aspects.

<Embodiment>
FIG. 1 is a perspective view of an underpants-type disposable diaper (hereinafter simply referred to as "diaper") according to the embodiment. The directional term used in this application means the direction corresponding to the front, back, left, and right of the wearer when the diaper 1 is worn by the wearer. For example, in the present application, the lateral direction means a direction corresponding to the lateral direction of the wearer when the diaper 1 is worn by the wearer.

In the present embodiment, as an example of an absorbent article, a pants-type disposable diaper having a cylindrical structure having an opening for receiving the wearer's abdominal circumference and a pair of left and right openings through which the wearer's left lower leg and right lower leg are inserted. However, the "absorbent article" in the present application is not limited to pants-type disposable diapers. The term "absorbent article" as used in the present application includes, for example, a tape fixed near one end of a sheet-like member that covers the wearer's crotch (pubic area) from the front body to the back body, Various forms of absorbent articles that can wrap around the waist and crotch are included, such as tape-type disposable diapers that are attached near the ends to form a tubular structure.

The diaper 1 includes a crotch region 1B, which corresponds to the crotch region covering the wearer's pubic region (crotch) in the worn state, and a region corresponding to the front body around the wearer's waist, which is the abdomen side of the wearer. It has a front body region 1F for covering and a back body region 1R for covering the wearer's back side, which is a part corresponding to the back body around the waist of the wearer. Here, the front body region 1F is located on the front side of the crotch region 1B, and the back body region 1R is located on the rear side of the crotch region 1B. Since the diaper 1 in this embodiment is a pants-type disposable diaper, the left edge of the front body region 1F and the left edge of the back body region 1R are joined together, and the right edge of the front body region 1F and the back body are joined together. The right edges of region 1R are joined together. Therefore, in the diaper 1, a waist opening 2T is formed by the upper edge of the front body region 1F and the upper edge of the back body region 1R. In the diaper 1, a left leg opening 2L is formed on the left side of the crotch region 1B, which is not joined, and a right lower leg opening 2R is formed on the right side of the crotch region 1B. The diaper 1 is arranged such that the wearer's left lower leg is inserted through the left lower leg opening 2L, the wearer's right lower leg is inserted through the right lower leg opening 2R, and the wearer's torso is inserted into the torso opening 2T. When worn, the front body region 1F is arranged on the abdomen side of the wearer, the back body region 1R is arranged on the back side of the wearer, and the left lower leg opening 2L and the right lower leg opening 2R are arranged on the wearer's thighs. It is fixed to the wearer's body in a state surrounding the part. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can walk while wearing the diaper 1 .

In the diaper 1, an absorbent body capable of absorbing and retaining liquid is mainly arranged around the crotch region 1B. In addition, the diaper 1 has a left lower leg opening surrounding the thigh of the wearer's left lower leg in order to suppress formation of a gap serving as an outflow path for liquid between the diaper 1 and the wearer's skin. Three-dimensional gathers 3BL are provided in 2L, three-dimensional gathers 3BR are provided in the lower right leg opening 2R surrounding the thigh of the wearer's right leg, and waist gathers 3R are provided in the region surrounding the waist circumference of the wearer. The three-dimensional gathers 3BL, 3BR and the waist gathers 3R are in close contact with the wearer's skin due to the elastic force of the thread rubber. Therefore, the excretory fluid discharged from the wearer's pubic region is absorbed by the absorber of the diaper 1 without substantially leaking out of the diaper 1 .

FIG. 2 is an exploded perspective view of the diaper 1 according to the embodiment. Moreover, FIG. 3 is the figure which expand|deployed the diaper 1 which concerns on embodiment, and showed typically the state which extended|stretched. FIG. 3(A) schematically shows the internal structure of the diaper 1 in the unfolded and stretched state when viewed from the left side. FIG. 3(B) schematically shows a plan view of the diaper 1 in an unfolded and stretched state.

The diaper 1 has cover sheets 4F, 4R and a pad cover sheet 6 which form the outer surface when worn by the wearer. The cover sheet 4</b>F mainly forms the outer surface of the front body region 1</b>F of the diaper 1 . Moreover, the pad cover sheet 6 mainly forms the outer surface of the crotch region 1B of the diaper 1 . Further, the cover sheet 4R mainly forms the outer surface of the back body region 1R of the diaper 1. As shown in FIG. The cover sheets 4F, 4R and the pad cover sheet 6 are provided to reinforce the outer surface of the diaper 1 and to improve its feel. A non-woven fabric can be used as the material. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). Further, the liquid-impermeable sheet may have a large number of fine holes of about 0.1 to several μm so as to exhibit liquid-impermeability and moisture permeability.

The diaper 1 also includes an inner cover sheet 5F laminated on the wearer-side surface of the cover sheet 4F (wearer's skin side surface) and an inner cover sheet 5R laminated on the wearer-side surface of the cover sheet 4F. have The inner cover sheet 5F is a sheet-like member having a shape that matches the portion of the cover sheet 4F that is closer to the crotch region 1B than a folding line 4F6, which will be described later. Like the inner cover sheet 5F, the inner cover sheet 5R is also a sheet-like member having a shape that matches the portion of the cover sheet 4R that is closer to the crotch region 1B than a folding line 4R6, which will be described later.

The diaper 1 also has a back sheet 7, an absorbent body 8, and a center sheet 9 which are laminated in order on the surface of the pad cover sheet 6 facing the wearer. The pad cover sheet 6 is a substantially rectangular parallelepiped sheet having a length extending in the longitudinal direction from the wearer's front body to the back body via the crotch, and having a predetermined width in the width direction orthogonal to the longitudinal direction. be. The back sheet 7, the absorbent body 8, and the center sheet 9 are all sheet-like members having a substantially rectangular appearance like the pad cover sheet 6, and the longitudinal direction thereof coincides with the longitudinal direction of the pad cover sheet 6. are sequentially laminated on the pad cover sheet 6 in the state shown in FIG. The back sheet 7 is a sheet made of liquid-impermeable thermoplastic resin in order to suppress leakage of excrement. Further, the center sheet 9 is a sheet-like member arranged on the wearer's skin surface side so as to cover the absorbent surface of the absorbent body 8 . This center sheet 9 is partially or wholly liquid permeable. Therefore, in the state in which the diaper 1 is worn, the liquid excreted by the wearer passes through the center sheet 9, which can come into contact with the wearer's skin, and enters the absorber 8, where it is absorbed. Examples of liquid-permeable sheets used for the center sheet 9 include woven fabrics, non-woven fabrics, and porous films. In the embodiment, a nonwoven fabric is used for the center sheet 9 . Further, the center sheet 9 may have hydrophilicity.

The absorber 8 contains short fibers of cellulose fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It has a structure in which granular absorbent resin such as a hydrophilic superabsorbent polymer having a crosslinked structure capable of absorbing and holding is held. Therefore, when the absorber 8 absorbs the liquid excreted by the wearer, the absorbent resin retained in the gaps in the short fibers swells and retains the liquid in the short fibers. The absorbent body 8 may have a single-layer structure consisting of one mat, or may have a laminated structure in which a plurality of mats are superimposed. Moreover, the absorber 8 can have an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape with a constricted central portion, and various other shapes.

The back sheet 7, absorbent body 8, and center sheet 9 all extend from the front body region 1F to the back body region 1R. Therefore, when the pad cover sheet 6, in which the back sheet 7, the absorbent body 8, and the center sheet 9 are laminated, covers the genital area (crotch) of the wearer, the back sheet 7, the absorbent body 8, and the center sheet 9 are stretched in the longitudinal direction. Both ends are positioned on the wearer's ventral side and dorsal side. In other words, the wearer's pubic region is covered with the absorber 8 from the wearer's ventral side to the dorsal side. Therefore, even if the wearer discharges the liquid to the outside of the body in either posture with the stomach facing down or the posture with the back facing down, the discharged liquid comes into contact with the absorber 8 via the center sheet 9. will do.

The diaper 1 also has elongated band-like side sheets 10L and 10R for forming the three-dimensional gathers 3BL and 3BR described above. The side seats 10</b>L and 10</b>R are provided on the long sides of the center seat 9 . Thread rubbers 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. Therefore, in the side sheets 10L and 10R, the edge 4F7 of the cover sheet 4F that serves as the left edge of the front body region 1F and the edge 4R7 of the cover sheet 4R that serves as the left edge of the back body region 1R are joined together, and , the edge 4F8 of the cover sheet 4F, which is the right edge of the front body region 1F, and the edge 4R8 of the cover sheet 4R, which is the right edge of the back body region 1R, are joined to each other, as shown in FIG. When the diaper 1 is in a perfect state, it is drawn in the longitudinal direction by the contractile force of the rubber threads 10L1 and 10R1 and rises from the center sheet 9 along the folding lines 10L2 and 10R2. As a result, three-dimensional gathers 3BL and 3BR are formed to prevent liquid from flowing out from the left lower leg opening 2L and the right lower leg opening 2R. The method of joining the edge 4F7 of the cover sheet 4F, the edge 4R7 of the cover sheet 4R, the edge 4F8 of the cover sheet 4F, and the edge 4R8 of the cover sheet 4R is not particularly limited, but examples include heat sealing, high-frequency sealing, ultrasonic sealing, and the like. can be done by

In addition, the diaper 1 includes a pad cover sheet 6, a back sheet 7, an absorber 8, a center sheet 9, and side sheets 10L and 10R, and an air passage forming sheet 11F laminated on the wearer-side surface of the cover sheet 4F. , and an air passage forming sheet 11R laminated on the wearer-side surface of the cover sheet 4R. The air passage forming sheet 11F is superimposed on the cover sheet 4F on one end side of the center sheet 9 in the longitudinal direction. In addition, the air passage forming sheet 11R is superimposed on the cover sheet 4R on the other end side of the center sheet 9 in the longitudinal direction. In the present application, the state in which the sheets are overlapped is not limited to the state in which the sheets are entirely in contact with each other, but includes the concept in which the sheets partially overlap each other. For example, the ventilation path forming sheet 11F is overlaid in such a manner that a portion of one end of the pad cover sheet 6 in the longitudinal direction touches a portion of the cover sheet 4F.

In the ventilation path forming sheet 11F, a large number of fine ventilation holes 11F1 for ventilation are arranged in a region extending in the left-right direction along the upper edge of the front body region 1F. A large number of ventilation holes 11R1 are arranged in the ventilation path forming sheet 11R as in the ventilation path forming sheet 11F. Here, the vent hole means an opening that allows the space on one side of the sheet to communicate with the space on the other side, and the shape thereof is not particularly limited. Therefore, as the ventilation holes 11F1 and 11R1, for example, openings having shapes such as circular, elliptical, and polygonal (triangular, quadrangular, etc.) can be applied. The formation of the ventilation holes 11F1 and 11R1 in the ventilation path forming sheets 11F and 11R does not mean that the ventilation path forming sheets 11F and 11R are made of a non-breathable material. 11R may be made of either a breathable material or a non-breathable material. The air passage forming sheets 11F and 11R are preferably made of a material having air permeability and liquid permeability, but may be made of, for example, a non-breathable material. Although the size and number of the ventilation holes 11F1 and 11R1 are not particularly limited, for example, if the opening area is 0.5 to 10 mm ² , it is preferable to form about 5 to 200 holes.

As described above, the diaper 1 includes the back sheet 7 and the center sheet 9 sandwiching the absorbent body 8, as well as the cover sheets 4F and 4R, the ventilation path forming sheets 11F and 11R, the pad cover sheet 6, the side sheets 10L, Since 10R is stacked and formed, it can be said that it has a laminate in which a plurality of these sheets are stacked.

Here, as shown in FIG. 3, one end side of the cover sheet 4F is folded back along the folding line 4F6. The above-described waist gathers 3R are formed by bonding rubber threads (rubber threads) 4F2 and 4F3 to the cover sheet 4F and rubber threads (rubber threads) 4R2 and 4R3 to the cover sheet 4R. be done. The rubber threads 4F2 and 4F3 adhered to the cover sheet 4F are stretched from the side of the folding line 4F6 along the folding line 4F6 that forms the upper edge of the front body region 1F when folded back. are set in order. Similarly to the rubber threads 4F2 and 4F3, the rubber threads 4R2 and 4R3 adhered to the cover sheet 4R also extend along the folding line 4R6 that forms the upper edge of the back body region 1R when folded back. The rubber thread 4R2 and the rubber thread 4R3 are provided in this order from the side. Therefore, the rubber threads 4F2 and 4F3 are provided on the cover sheet 4F in such a direction that the waistline direction, which is the stretching direction, is the left-right direction of the diaper 1. As shown in FIG. Further, the thread rubbers 4R2 and 4R3 are provided on the cover sheet 4R in such a direction that the longitudinal direction, which is the stretching direction, is the horizontal direction of the diaper 1. As shown in FIG. Therefore, when the edge 4F7 and the edge 4R7 are joined to each other, and the edge 4F8 and the edge 4R8 are joined to each other, the rubber threads 4F2, 4F3 and the rubber threads 4R2, 4R3 are formed in a substantially annular shape that revolves along the trunk opening 2T. , and exerts the function of contracting the waist opening 2T in the waist circumference direction. That is, the rubber threads 4F2, 4F3 and the rubber threads 4R2, 4R3 exhibit contractile force to bring the diaper 1 into close contact with the wearer, thereby preventing formation of a gap between the diaper 1 and the wearer's waist circumference.

Further, rubber threads 4F4 and 4F5 are adhered to the cover sheet 4F, and rubber threads 4R4 and 4R5 are adhered to the cover sheet 4R. The rubber threads 4F4 and 4F5 are elastic members provided in a region of the cover sheet 4F closer to the crotch region 1B than the rubber thread 4F3. However, unlike the rubber threads 4F2 and F3, which are bonded from the left end to the right end of the cover sheet 4F without interruption, the rubber threads 4F4 and 4F5 have a predetermined width in the central portion in the width direction corresponding to the absorber 8. only cut. The cover sheet 4F has thread rubbers 4F4 and 4F5 cut at the central portion in the width direction corresponding to the absorber 8, so that the absorber 8 does not inhibit the expansion of the absorber 8 due to water absorption, and the wearer's lower abdomen is covered. Gives a moderate feeling of close contact. The cover sheet 4R is similar to the cover sheet 4F, and thread rubbers 4R4 and 4R5, which are cut by a predetermined width at the central portion in the width direction corresponding to the absorber 8, are adhered to the cover sheet 4R. , to give a moderate fit to the lower abdomen of the wearer.

By the way, as can be seen from FIG. 3, the rubber thread 4F2 is provided so as to extend in the left-right direction along the upper edge portion of the front body region 1F shown in FIG. Three thread rubbers 4F2 are provided in parallel at predetermined intervals. A plurality of rubber threads 4F3 are provided next to the three rubber threads 4F2 so as to extend in the horizontal direction like the rubber threads 4F2. When the diaper 1 is worn, the rubber thread 4F3 is positioned near the left and right ends of the wearer's pelvis, and thus mainly has the function of holding the diaper 1 on the waist of the wearer. Further, the rubber thread 4F2 has a function of preventing leakage of liquid from the diaper 1 by surrounding the wearer's abdominal circumference above the rubber thread 4F3 when the diaper 1 is worn. It has a function of relieving a feeling of pressure on the wearer due to the contractile force and a function of discharging the moisture inside the diaper 1 . As shown in FIG. 3, a plurality of rubber threads 4F4 and 4F5 are provided next to the rubber thread 4F3 so as to extend in the horizontal direction like the rubber thread 4F3. As described above, the rubber threads 4F4 and 4F5 are cut at portions corresponding to the absorber 8. As shown in FIG.

FIG. 4 is a diagram showing the relationship between the interval between the rubber threads 4F2 and the size of the air passage appearing in the waist gathers 3R in the front body region 1F. The view shown in FIG. 4A is a view when the waist gathers 3R are viewed from the side where the wearer's skin comes into contact. 4(B) is a view showing the internal structure inside the waist gathers 3R when viewed from the side of the diaper 1. As shown in FIG. 4(C) is a diagram showing a state when the waist gathers 3R are viewed from above the diaper 1. As shown in FIG. 4(D) is a diagram showing a state of the waist gathers 3R viewed from above the diaper 1 in a contracted state. Although FIG. 4 shows the front body region 1F of the waist gathers 3R for convenience of explanation, the same applies to the back body region 1R of the waist gathers 3R.

As shown in FIG. 4, the cover sheet 4F is folded back along the folding line 4F6 shown in FIG. 2, and the ventilation path forming sheet 11F is overlaid and joined. Joining is performed in a state in which each rubber thread and sheet are stretched. The dashed line of symbol S in the drawing shown in FIG. 4(A) is the joined portion. 4(C) and 4(D) are joined portions.

The joining portion S joining the cover sheet 4F and the air passage forming sheet 11F with the cover sheet 4F folded back at the folding line 4F6 is shown in FIG. It is in the form of a straight line extending in a direction perpendicular to the upper edge of the front body region 1F shown. A plurality of joint portions S are provided in parallel, and are provided so that each interval is alternately large and small. Therefore, as can be seen from FIG. 4, the joint portion S has a form in which double lines are arranged at regular intervals. By adopting a form in which the double lines formed by the joint portions S are arranged at regular intervals, as shown in FIG. Paths 13 are formed alternately. This is because joining is performed in a state in which each rubber thread and sheet are stretched, and then when the stretched state is released and the waist gather 3R is shrunk by the contractile force of the rubber thread 4F2, the two joints forming a double line are formed. A relatively small first air passage 12 is formed by bending of the sheet in the portion between S with a narrow interval, and a relatively large second air passage 12 is formed by bending of the sheet in the portion between the double lines with a wide interval. 13 is formed.

By forming the joining portion S in which the double lines are arranged at equal intervals, the first air passage 12 and the second air passage 13 formed by the bending of the sheet are formed in the waist gather 3R after contraction. Formed alternately in corrugations. Symbol SS indicated by a chain double-dashed line in FIG. 4(D) indicates a virtual line of the skin surface that comes into contact with the ventilation path forming sheet 11F when the diaper 1 is worn by the wearer. The second air passage 13 is formed as a gap formed between the skin contacting surface of the air passage forming sheet 11F and the wearer's skin when the diaper 1 is worn by the wearer. Moisture between the diaper 1 and the wearer's skin surface can be discharged to the outside through the second air passage 13 formed in the waist gathers 3R. The first air passage 12 is a passage through which moisture passes through the air holes 11F1 of the air passage forming sheet 11F. The diaper 1 can introduce moisture generated between the diaper 1 and the skin surface into the first air passage 12 through the ventilation holes 11F1 and discharge it to the outside. Thereby, the diaper 1 can suppress a wearer's damp feeling. The second ventilation path 13 is a path that directly communicates the space between the diaper 1 and the skin surface with the external space of the diaper 1, and allows the moisture in the diaper 1 to be discharged more smoothly. Moreover, since the ventilation path forming sheet 11R has the ventilation holes 11R1, the diaper 1 can obtain the same effect in the back region 1R of the waist gathers 3R.

Next, the center sheet 9 of the diaper 1 according to the embodiment will be described in detail. As shown in FIG. 3 , the center sheet 9 is a liquid-permeable sheet member that covers the skin surface side of the absorbent body 8 . The center sheet 9 has a rectangular shape whose longitudinal direction is the direction connecting the front body region 1F and the back body region 1R.

FIG. 5 is a plan view of the center seat 9 viewed from the skin surface side. In the drawing, the upper side is the front body area 1F, and the lower side is the back body area 1R. The center sheet 9 is arranged across the front body region 1F and the back body region 1R. Further, the center sheet 9 has an upper sheet 9A arranged on the skin surface side and a lower sheet 9B arranged on the absorber 8 side while being superimposed on the upper sheet 9A. A nonwoven fabric is used for the upper sheet 9A and the lower sheet 9B. Also, the upper sheet 9A and the lower sheet 9B have a rectangular shape with substantially the same size, and are stacked so that their longitudinal and width directions are aligned. The upper sheet 9A and the lower sheet 9B are joined at each end in the longitudinal direction. A plurality of valve portions 20 are formed in the upper seat 9A. A large number of the valve portions 20 are arranged in a matrix. The plurality of valve portions 20 may be arranged in a zigzag pattern or other arrangement pattern.

FIG. 6A is an enlarged view of a region A surrounded by a circular dotted line in FIG. The valve portion 20 is defined by a curved cut 21 penetrating through the upper sheet 9A in the thickness direction, and is connected to the upper sheet 9A by an uncut portion 22 connecting the ends 21A and 21B of the cut 21 . In a plan view, the cut 21 is a convex curve such as a C-shape, a U-shape, or a V-shape, and the uncut portion 22 is linear, and the valve portion 23 is connected to the skin-side sheet 9A by the uncut portion 22. is formed in In the embodiment, the notch 21 has a fan-shaped arc shape with a central angle θ of about 270 degrees, and is substantially C-shaped. The notch 21 may be, for example, semicircular, U-shaped, or V-shaped. The incision 21 is preferably formed so as to be convex in one direction and leave a linear uncut portion 22 on the opposite side of the convex side.

FIG. 6(B) is a cross-sectional view taken along line BB passing through the center of the valve portion 20 and the uncut portion 22 in FIG. 6(A). The valve portion 20 is bent toward the lower seat 9B from the uncut portion 22 and is joined to the lower seat 9B. In FIG. 6B, the joint S1 between the valve portion 20 and the lower seat 9B is shown surrounded by an elliptical dotted line. The valve portion 20 and the lower seat 9B are joined by, for example, hot melt, ultrasonic fusion, or heat fusion.

By joining the valve portion 20 to the lower seat 9B, a hole 23 is formed that communicates the skin surface side of the upper seat 9A with a space 24 between the upper seat 9A and the lower seat 9B. The diaper 1 introduces solid matter contained in watery feces into the space 24 through the holes 23 . Furthermore, the diaper 1 absorbs the liquid contained in the watery feces with the absorber 8 arranged below the lower sheet 9B. Thereby, the diaper 1 can separate solids and liquids contained in watery feces. The diaper 1 separates solid matter and liquid contained in watery stools to lose the fluidity of the watery stools, stores the solid matter in the space 24, and absorbs the liquid with the absorber 8. , leakage can be suppressed. By forming a hole, a notch, or the like that penetrates the lower sheet 9B, it is possible to make it easier to introduce the liquid into the absorbent body 8 arranged in the lower layer of the lower sheet 9B.

In addition, the center sheet 9 is arranged across the front body region 1F and the back body region 1R, and in the worn state, the lower sheet 9B is relatively longer than the upper sheet 9A in the direction from the longitudinal center to the front body region 1F. , the lower sheet 9B pulls the valve portion 20 to expand the hole 23. As shown in FIG. As described above, in the diaper 1, it is desirable that the holes 23 are enlarged when the diaper 1 is worn, in order to facilitate the introduction of the solid matter into the space 24 through the holes 23. As shown in FIG. As a result, the diaper 1 can facilitate introduction of solid matter into the space 24 through the holes 23 .

Also, as shown in FIG. In the diaper 1, the plurality of valve portions 20 may be formed such that the uncut portion 22 faces an anus contacting position 25 on the upper sheet 9A where the wearer's anus abuts. FIG. 7 is a plan view of the center seat 9 viewed from the skin surface side as in FIG. On the upper sheet 9A, an anus contacting position 25 is defined which is positioned within the crotch region 1B and where the wearer's anus contacts. In the upper sheet 9A, a plurality of valve portions 20 are provided in a first region A1 on the front body region 1F side of the anus contact position 25 and a second region A2 on the back body region 1R side of the anus contact position 25. formed. The valve portion 20 in the first region A1 is formed so that the uncut portion 22 faces toward the back body region 1R. The valve portion 20 in the second region A2 is formed so that the uncut portion 22 faces toward the front body region 1F. Watery feces discharged from the wearer's anus onto the upper sheet 9A are diffused from the anus-contacting position 25 toward the front body region 1F or the back body region 1R. In the diaper 1, in the first region A1 on the front body region 1F side of the anus contact position 25, the uncut portion 22 faces the back body region 1R side, and the second region on the back body region 1R side of the anus contact position 25. By arranging each valve portion 20 so that the uncut portion 22 faces the front body region 1F side at A2, solid matter in discharged watery feces moves from the uncut portion 25 through the valve portion 20 along the direction of movement. The solid matter can be guided through the holes 23 . As a result, the diaper 1 can suppress leakage by rapidly introducing solid matter of watery feces into the space 24 through the holes 23 .

Next, a configuration example capable of expanding the hole 23 will be described. FIG. 8 is a plan view of the center sheet 9 viewed from the skin side as in FIG. In this example, the center seat 9 is provided with a plurality of rubber threads 26 as elastic members.

As shown in FIG. 8, a plurality of rubber threads 26 are arranged on the upper sheet 9A. Each thread rubber 26 is stretched in a direction (longitudinal direction) connecting the front body region 1F and the back body region 1R, and is stretched around the first region A1 and the second region A2 in the upper sheet 9A. is glued to Each thread rubber 26 may be adhered to either the skin surface side of the upper sheet 9A or the lower sheet 9B side. Each rubber thread 26 is arranged between each valve portion 20 arranged in a matrix. In the upper sheet 9A, the thread rubber 26 shrinks centering between the first area A1 and the second area A2, so that the upper sheet 9A shrinks in the direction of the back body area 1R in the first area A1 and the front body in the second area A2. Shrinks in the direction of area 1F. In the diaper 1, in the first region A1 on the front body region 1F side of the anus contact position 25, the uncut portion 22 faces the back body region 1R side, and the second region on the back body region 1R side of the anus contact position 25. At A2, each valve portion 20 is arranged so that the uncut portion 22 faces the front body region 1F side, and the upper sheet 9A is moved to the lower sheet 9B so that the uncut portion 22 moves toward the anal contact position 25. It is possible to expand the hole 23 by moving it relative to it. As a result, the diaper 1 facilitates the introduction of watery fecal matter into the space 24 through the holes 23, thereby suppressing leakage.

Further, the rubber thread 26, which is an elastic member, may be arranged on the lower sheet 9B. FIG. 9 is a plan view of the lower sheet 9B viewed from the skin side. As shown in FIG. 9, a plurality of rubber threads 26 are arranged on the lower sheet 9B. In FIG. 9, the anal contact position 25, the first area A1 and the second area A2 on the upper sheet 9A are illustrated for explanation. Each thread rubber 26 stretches in a direction (longitudinal direction) connecting the front body region 1F and the back body region 1R, and expands and contracts centering on a position corresponding to between the first region A1 and the second region A2. is adhered to the upper sheet 9A. The position corresponding to between the first area A1 and the second area A2 is the position between the first area A1 and the second area A2 of the upper sheet 9A when viewed in the thickness direction of the center sheet 9. This is the overlapping position. Each thread rubber 26 may be adhered to either the upper sheet 9A side or the absorber 8 side of the lower sheet 9A.

The lower sheet 9B shrinks in the direction of the back body region 1R in the region corresponding to the first region A1 by shrinking the rubber threads 26, and shrinks in the direction of the front body region 1F in the region corresponding to the second region A2. do. In the diaper 1, in the first region A1 on the front body region 1F side of the anus contact position 25, the uncut portion 22 faces the back body region 1R side, and the second region on the back body region 1R side of the anus contact position 25. At A2, each valve portion 20 is arranged so that the uncut portion 22 faces the front body region 1F side, and the lower sheet is arranged so that the uncut portion 22 moves toward the anal contact position 25 together with the joint portion S1. By moving 9B relative to upper sheet 9A, hole 23 can be enlarged. As a result, the diaper 1 can be easily introduced into the space 24 through the hole 23 and leakage can be suppressed.

In addition, in the example shown in FIGS. 8 and 9, at least one rubber thread 26 may be arranged on either one of the upper sheet 9A and the lower sheet 9B. The diaper 1 can expand the holes 23 by contracting the upper sheet 9A or the lower sheet 9B.

In addition, although the diaper 1 was illustrated in the above-described embodiment, the above-described configuration and manufacturing method can be applied to other forms of absorbent articles. Examples of absorbent articles to which the above configuration and manufacturing method can be applied include various forms of absorbent articles with gathers such as pants-type disposable diapers, tape-type disposable diapers, urine pads, and light incontinence pads, and non-gathered absorbent articles. Mention may be made of flat absorbent articles.

1 Diaper: 1B Crotch region: 1F Front body region: 1R Back body region: 2T Torso opening: 2L Left lower leg opening: 2R Right lower leg opening: 3BL, 3BR... Solid gathers: 3R... Waist gathers: 4F, 4R... Cover sheets: 4F1, 4R1... Openings: 4F2, 4F3, 4F4, 4F5, 4R2, 4R3, 4R4, 4R5, 10L1, 1
0R1 Thread rubber: 4F6, 4R6, 10L2, 10R2 Folding line: 4F7, 4F8, 4R7, 4R8 Edge: 5F, 5R Inner cover sheet: 6 Pad cover sheet: 7 Back sheet : 8 Absorbent body: 9 Center sheet: 9A Upper sheet: 9B Lower sheet: 10L, 10R Side sheet: 11F, 11R Ventilation path forming sheet: 11F1, 11R1 Through Pore: S Joined portion: 12 First air passage: 13 Second air passage: 20 Valve portion: 21 Notch: 21A, 21B End of notch: 22 Left uncut: 23... Hole: 24... Space: 25... Anus contact position: 26... Thread rubber: S1... Joining part: A1... First area: A2... Second area

Claims (3)

An absorbent article comprising a front body region covering the abdomen of a wearer, a back body region covering the back of the wearer, and a crotch region positioned between the front body region and the back body region and covering the crotch of the wearer There is
an absorber;
a liquid-permeable sheet member covering the skin surface side of the absorber;
with
The sheet member has an upper sheet arranged on the skin surface side, and a lower sheet overlapped with the upper sheet and arranged on the absorber side,
a valve portion defined by a curved cut that penetrates the upper sheet in the thickness direction and is connected to the upper sheet by an uncut portion that connects both ends of the cut;
a hole formed by bonding the valve portion to the lower sheet and communicating the skin surface side of the upper sheet with a space formed between the upper sheet and the lower sheet;
with
The seat member is arranged across the front body region and the back body region, and the valve portion is located in the crotch region of the upper sheet and is an anus contact position where the anus of the wearer contacts. a first region on the front body region side of the upper sheet and a second region on the back body region side of the anus contact position on the upper sheet, and
The valve portion in the first region is formed so that the uncut portion faces the back body region side,
The valve portion in the second region is formed so that the uncut portion faces the front body region side,
a stretchable member arranged on the upper sheet so as to stretch between the first region and the second region while being stretched in a direction connecting the front body region and the back body region;
The upper sheet shrinks in the first region toward the back body region and shrinks in the second region toward the front body region due to the contraction of the stretchable member.
absorbent article. An absorbent article comprising a front body region covering the abdomen of a wearer, a back body region covering the back of the wearer, and a crotch region positioned between the front body region and the back body region and covering the crotch of the wearer. in
hand,
an absorber;
a liquid-permeable sheet member covering the skin surface side of the absorber;
with
The sheet member has an upper sheet arranged on the skin surface side, and a lower sheet overlapped with the upper sheet and arranged on the absorber side,
a valve portion defined by a curved cut that penetrates the upper sheet in the thickness direction and is connected to the upper sheet by an uncut portion that connects both ends of the cut;
a hole formed by bonding the valve portion to the lower sheet and communicating the skin surface side of the upper sheet with a space formed between the upper sheet and the lower sheet;
with
The seat member is arranged across the front body region and the back body region, and the valve portion is located in the crotch region of the upper sheet and is an anus contact position where the anus of the wearer contacts. a first region on the front body region side of the upper sheet and a second region on the back body region side of the anus contact position on the upper sheet, and
The valve portion in the first region is formed so that the uncut portion faces the back body region side,
The valve portion in the second region is formed so that the uncut portion faces the front body region side ,
Elasticity arranged on the lower sheet so as to expand and contract about a position corresponding to between the first region and the second region in a state of being stretched in a direction connecting the front body region and the back body region. Equipped with components,
The lower sheet shrinks in the direction of the back body region in the region corresponding to the first region and contracts in the direction of the front body region in the region corresponding to the second region by contraction of the elastic member. do,
absorbent article. The notch is substantially C-shaped,
3. The absorbent article according to claim 1 or 2 .

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