JP5438952B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, a disposable diaper has a pair of fastening tapes on both sides of one end portion in the longitudinal direction, and the fastening tape is fixed to a landin zone provided on the outer surface of the other end portion in the longitudinal direction (hereinafter, developed) Disposable diapers (hereinafter referred to as pants-type diapers) in which a waist opening and a pair of leg openings are formed in advance are widely known.

  Among these, the deployable disposable diaper is provided with a wall-like standing part that protrudes toward the skin surface along with an absorbent core that exists in the vicinity of the side edge part that forms the leg opening on both sides in the width direction of the diaper. Have been disclosed (see Patent Documents 1 to 3). According to this unfolded diaper, even if there is urine or the like that has moved around the base of the foot when worn, the absorption core inside the upright portion can absorb this and cope with it. Also, when the baby is worn exclusively by infants, there are elastic cores inside the raised parts on both sides of the diaper, so that the raised parts are elastically deformed from the inner thigh to the crotch and fit. .

  Patent Document 4 discloses a technique in which each advantage of “deployable diaper” and “pants-type diaper” is utilized in one diaper. Specifically, this disposable diaper has a central part sandwiched between a pair of perforations and an outer part connected to the central part via the central part on the ventral side of the diaper, and the perforation to be broken. A fastening tape is housed in the portion, and if the fastening tape is pulled out by breaking the perforation, the shape can be changed from a “pants-type diaper” to a “tape-type diaper”.

Japanese Utility Model Publication No. 5-9525 Japanese Utility Model Publication No. 1-125311 Japanese Patent Laid-Open No. 2-111362 JP 2006-204688 A

  By the way, in consideration of the ease of wearing a pant-type diaper and the fit between the crotch at the time of wearing regardless of whether it is a pant-type or a deployment type, there is an absorbent core having an hourglass shape. In a diaper equipped with such an absorbent body, the shape immediately below the crotch may swell greatly to the non-skin surface side when worn, or may be separated from the wearer's skin, and the fit is not good at that part Gives the wearer an unstable feeling. In addition, when urination or the like occurs, if a flow of liquid or the like is generated through the gap, excrement may leak out of the diaper.

  In view of the problems peculiar to the diaper having the above-mentioned hourglass-shaped absorption core, the present invention has a high anti-moisture prevention property such as liquid in the lower crotch, particularly in the vicinity of the inner thigh, and has a feeling of fit in the crotch portion. The purpose is to provide disposable diapers that are comfortable to wear. In addition, the present invention is intended to provide a disposable diaper that is compatible with the above-mentioned new pants-type and unfolded-type diapers, particularly for adults, and can achieve both the above-described anti-moisture prevention and good comfort. And

  The present invention has an hourglass-shaped absorbent core in a plan view having a wide portion on both sides in the longitudinal direction and a constricted portion therebetween, and the wide portion is disposed on the stomach side and the back side of the wearer, and the constricted portion is A disposable diaper arranged on the crotch, the diaper has a crotch flap portion extending outward in the width direction of the constricted portion of the absorbent core, and the crotch flap portion constitutes this The above object is achieved by providing a disposable diaper having a tuck portion extending in the longitudinal direction by picking up a sheet material to be performed.

  The disposable diaper of the present invention solves the problems peculiar to a diaper having an hourglass-shaped absorbent core, has a high anti-moisture prevention property such as liquid near the crotch, particularly in the vicinity of the inner thigh, and is not prepared in the crotch part The diaper and the skin are kept in close contact with each other without leaving a gap between them. In addition, the present invention is particularly suitable for the above-mentioned new pants-type and unfolded-type diapers for adults, and has the excellent effect of being able to achieve both the above-mentioned high anti-moisture properties and good wearing comfort. .

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 is a perspective view seen from the wearer's ventral side, schematically showing a pants-type and unfolded disposable diaper 10 for adults as a preferred embodiment (first embodiment) of the present invention in a shape when worn. FIG. The diaper 10 includes a lower band member 1 and an annular outer band 2. The annular outer band 1 is composed of an abdominal part 21 and a dorsal part 22 that form a semicircular circumference, and these parts are joined by forming side seal portions 33 at the left and right sides of the wearer. The method for joining the sheets in the side seal portion 33 is not particularly limited, and the sheets can be joined by means such as heat sealing or ultrasonic sealing. And the annular exterior body 2 comprises the annular waist opening Wo in the wearer's height direction upper side, and is worn through a wearer's waist here. On the other hand, the lower band member 1 is worn by bonding both end portions of the lower band member 1 to the inner surface (the surface on the skin contact surface side) of the ventral region 21 and the inner surface of the back region 22 of the annular outer band 2. It is suspended along the person's crotch. Thereby, a pair of leg opening part Lo is formed, and the pants shape of a heel structure is comprised as a whole.

  The fixing method of the ventral region 21 and the dorsal region 22 and the lower belt member 1 is not particularly limited, and a predetermined region of the portion overlapping the lower belt member 1 and the ventral region 21 or the dorsal region 22 is not limited. In almost the whole area, it is fixed with an adhesive or the like, both are joined only at the peripheral edge of the lower belt member 1, or both are joined only at the center or both ends of the lower belt member 1 in the width direction. You can also. Further, instead of the adhesive, heat sealing, ultrasonic sealing, or the like can be used. The surface bonding between the lower band member 1 and the annular outer band 2 can be performed by, for example, a hot melt adhesive applied in a planar shape, a dotted shape, a linear shape, or a spiral shape.

  FIG. 2 is a developed plan view schematically showing a state where the pants-type and unfolded disposable diapers shown in FIG. The open main part of the annular outer band 2 that is broken and expanded (the connecting member of the front part openable part 21a of the ventral part 21 and the back part (rear part) 22) is T-shaped as a whole. It has a shape in which the direction (X direction) is slightly longer. However, the contour of the intersection of the horizontal bar and the vertical bar when the T-shape is formed is a gentle reverse arc shape in the outer shape of both sides, that is, an arc that enters the inside of the exterior band 2. And the longitudinal direction of the open main part of the exterior band, that is, the vicinity of the center part in the diaper width direction (X direction) is the outer surface (non-skin surface side) of one end part (end part on the back side rear part R) of the lower band member 1 And the annular outer band 2 and the lower band member 1 are joined to each other at the covered portion. The outer surface of the other end portion (end portion on the ventral front portion F side) of the lower band member 1 is covered with the ventral portion 21 (the front body openable portion 21a, the front body non-opening portion 21b). A part (the front body non-opening portion 21 b) that covers the outer surface of the other end of the member 1 is fixed to the outer surface of the lower belt member 1. In this way, the diaper 10 assembled by joining the annular outer band 2 and the lower band member 1 is also T-shaped even in the above-described broken and unfolded state, and the T-shaped vertical bar formed by the annular outer band 2. The part is made to extend further. Thus, the diaper 10 of this embodiment is divided into the back side rear part R, the abdominal side front part F, and the crotch intermediate part C intervened in these parts as a whole. The portion R is connected to form the waistline portion D (see FIG. 1).

  The ventral region 21 of the annular outer band 2 has a pair of breakable break guide lines 24 extending in the diaper length direction (Y direction), and a front body non-opening portion (center portion) 21b sandwiched between the pair of breakable guide lines 24. It is divided into a front body opening part (outer side part) 21a. In the present embodiment, the break guide wire 24 is formed by a perforation formed in a linear shape (see FIG. 1), and extends between the upper and lower ends of the ventral region 21. Then, the front body non-opening part 21b (breaking line 24b) and the front body opening part 21a (breaking line 24a) are separated by the wearer's or a helper's hand along the breaking guide line 24 formed by the perforation. In this way, it can be cut off and separated from the lower band member 1 by opening the front body opening part 21a, and the belly side of the annular outer band 2 can be opened in double doors to form a developed diaper.

  In this embodiment, the dorsal side portion 22 of the annular outer band 2 has a shape like an inverted volcano section in which a rectangle is combined with the bottom of a trapezoid, and this inverted trapezoidal portion is the main part. It is worn to cover the wearer's buttocks. And it was arrange | positioned so that it might become the shape which opens upwards in the length direction seeing from a wearer's back (reverse "eight" character) in the both sides of the collar part corresponding part of the inverted trapezoid part in the back side part 22 It has a pair of left and right ridge groove compatible elastic elastic members 71. This grooving-compatible elastic elastic member 71 exerts an appropriate tension (stretching stress) according to the wearer's buttocks when worn, forming a hip gather, and in particular, the inseam part of the elastic elastic member 71 is worn It fits as if it bites into the groin of the person. Further, the bulges protruding from the left and right sides of the buttocks from the ridge portion of the elastic elastic member 71 to the upper side in the height direction are squeezed from both sides, and a good fit is achieved by gently pulling them up.

  In the first embodiment, the annular outer band 2 is formed from two sheets such as a nonwoven fabric (shown as one sheet in the figure), and between the two sheets, waist elastic along the waistline direction. The elastic member 72 and the waist elastic elastic member 73 are fixed in an extended state. The elastic elastic members 72, 73 are appropriately contracted in the waistline direction in the worn state to form waist gathers and waistline gathers, respectively, and fit the wearer's waistline so that the diaper 10 is brought into close contact with the wearer.

  Leg gather elastic elastic members 74 extending along the longitudinal direction (Y direction) forming the leg opening Lo when worn are disposed on both side edges of the lower belt member 1 in the diaper width direction (X direction). The leg gather elastic elastic member 74 has a tension (stretching stress) to form a good leg gather around the leg while wearing it. To fit.

  FIG. 3 is a perspective view showing a state in which a break guide line 24 constituted by a perforation on the left side of the wearer of the diaper in FIG. 1 is broken. In the diaper 10 of this embodiment, the fastening tape 3 fixed to the inner side (skin side) of the front body openable portion 21a of the abdominal part 21 in the vicinity of the breaking guide line 24 of the annular outer band 2 is disposed. Has been. The fastening tape 3 has a planar fastener 3b attached to the skin surface side of the base sheet 3a, and an ear M with the planar fastener 3b from the openable portion 21a separated and opened by the breakage of the breaking guide line 24. The part of can be pulled out. The base material sheet 3a of the fastening tape 3 can be comprised from the laminated body of a nonwoven fabric, a nonwoven fabric, and a resin film, etc., for example. Examples of the planar fastener (male material) include a structure in which hook-shaped or mushroom-shaped minute protrusions are densely arranged on the engaging surface 3i. Specifically, a normal mechanical hook-and-loop fastener that can be detachably fastened to the female member can be used. The mating member to which the planar fastener 3b is engaged may be a normal nonwoven fabric, and for example, a cloth material having a looped or crimped fiber surface may be used. Therefore, it can be usually attached to an arbitrary surface using a nonwoven fabric of a diaper, and a material particularly suitable for attachment may be applied separately to form a landing portion. In the present embodiment, the non-skin surface of the front body non-opening portion 21b of the ventral region 21 is a landing portion with good engagement. In addition, the fastening tape 3 in the storage state is temporarily attached to a female member of a mechanical hook-and-loop fastener whose engagement surface 3i is bonded and fixed to the inner surface of the base sheet 3a.

  In the present embodiment, each breaking guide line (perforation) 24 is formed on the both sides in the width direction of the lower belt member 1 from the viewpoint of forming portions 1c that overlap the front body openable portion 21a serving as the outer portion. The band member 1 is formed on the inner side from the positions of both side edges 1s in the width direction. Thus, by forming the part 1c which overlaps with the front body openable part 21a on the lower belt member 1, the ear M of the fastening tape 3 can be arranged so as to overlap the lower belt member 1, and thereby the ear M of the fastening tape 3 can be arranged. Can prevent discomfort and incongruity from coming into contact with the wearer. Further, since the lower belt member 1 having a relatively high rigidity exists under the perforation 24, the breaking operation of the perforation 24 can be accurately performed.

  In the present embodiment, the break guide wires 24 extend in the height direction on both sides of the diaper 10 across a portion corresponding to the wearer's navel, and are provided substantially in parallel. At this time, the break guide line (perforation) 24 provided substantially in parallel is the wearer's median surface as it goes from the upper side to the lower side of the abdominal part 21 according to the wearer's body shape as the shape at the time of wearing. It may be formed to be slightly inclined so as to approach the cutting line (diaper vertical center line) corresponding to, that is, it may have a slightly inverted “eight” shape. The fracture guide line (perforation) 24 may be a straight line as in the present embodiment, or may be a curved line such as an arc or a sine curve.

  It is preferable that the perforation forming the breaking guide line 24 is relatively easily broken in the scene of use while maintaining a strength that does not break during diaper manufacturing and during diaper mounting. For this reason, it is preferable that the upper end portion and the lower end portion of the perforation 24 in the ventral region 21 are slightly separated from the upper and lower end edges of the ventral region 21 by a distance d (see FIG. 1 left side of the wearer). (See Break Guide Line). It is preferable that the distance d from each of the upper and lower end edges of the ventral region 21 to the cut closest to each end edge is 1.5 mm or more. On the other hand, the ratio [La / Lb] of the length La of the perforation cut and the length Lb between the cuts is preferably in the range of 2 to 8 from the viewpoint of securing an appropriate breaking strength, More preferably, it is in the range of 3-7. Speaking numerically, it is preferable that La is in the range of 2 to 10 mm and Lb is in the range of 1 to 5 mm. Further, if necessary, a notch portion or a grip allowance as a starting point can be provided at the break start portion of the break guide wire. In FIGS. 1 and 3, the size of the perforation and the distance d between the edges are exaggerated slightly in consideration of the visibility on the drawings.

Next, the tack part formed in the crotch flap part H extended in the outer side of the hourglass-shaped absorptive core 4 in the lower belt member 1 which is the principal part of the disposable diaper of this embodiment, and the center narrow part 4c. 5 will be described with reference to FIG.
In the first embodiment, the constricted portion 4c interposed in the middle of the hourglass shape, that is, the wide portions 4f and 4r on both sides in the longitudinal direction (Y direction), as shown in the plan view of the unfolded state, is loose. It is a constricted shape that forms an inverted arc shape that goes inward. Here, on both sides in the longitudinal direction of the absorbent core 4, the wide portion 4 f at the front portion F is along the abdomen side of the wearer, and the wide portion 4 r at the rear portion R is along the back side. And the crotch constriction part 4c of the absorptive core in the position corresponding to the intermediate part C corresponds to feces excretion from the wearer's urinary excretion corresponding areas P and Q (area Q for men and area P for women). It is made to extend along the region O. And the urine excretion corresponding | compatible area | region P in the case of the said female wearer is equivalent to a wearer's crotch, and area | regions O and Q are located in the periphery. In this way, the absorbent core 4 runs along the crotch from the wearer's lower abdomen to the buttocks.

More specifically, regarding the hourglass shape of the absorbent core 4, the maximum width W ₁ (W _1f , W _1r ) of the wide portions 4 f and 4 r is wider than the minimum width W ₂ of the constricted portion 4 c, and the specific width Is not particularly limited, but the ratio (W ₂ / W ₁ ) of the minimum width W ₂ of the constricted portion 4c to the maximum width W ₁ of the wide portions 4f and 4r is preferably 75% or less, and 40 to 60 % Is more preferable. Thus a constricted larger at the center, i.e. constricted portion minimum width W ₂ that is to correspond extent smaller than the maximum width W ₁ of the wide portion of suppressed around the thigh of the wearer when worn For example, it is possible to realize a good wearing comfort without feeling that the inner thigh is rubbed when walking. Moreover, when using as a pants-type diaper, when a toe is worn, the toe is caught on the absorbent core or the vicinity thereof, and for example, an elderly person or the like falls and is injured suitably.

  In the diaper of the first embodiment, the top sheet 6 is disposed on the skin surface side and the back sheet 8 is disposed on the non-skin surface side so that the lower band member 1 contains the absorbent core 4. ing. And the width direction (X direction) both sides of this back surface sheet 8 are turned up to the surface sheet 6 side, and the absorptive core 4 is turned inward so that it may wrap. What is necessary is just to perform suitably joining in the longitudinal direction (Y direction) both sides of the said surface sheet 6 and the back surface sheet 8 with a hot-melt-adhesive agent etc., for example. In this lower belt member 1, there is almost no portion extending outward from the absorbent core 4 present at the end of the back side portion R, but the width of the ventral side portion F in the longitudinal direction and the middle portion C. There are portions extending outward from the absorbent core 4 in both directions outward. The outwardly extending portion of the sheet member with respect to such an absorbent core is referred to as a “flap portion (H)”. The sheet member constituting the portion may be a single layer or a composite sheet in which a plurality of sheets are laminated, or may be configured in combination with a functional material such as an elastic elastic member.

  In the first embodiment, the lower belt member 1 is a long rectangular member extending in the longitudinal direction (Y direction) as a whole, but the tack portion 5 formed by pinching the sheet material at the crotch flap portion H. Is formed. Therefore, the outer edge 1s in the crotch intermediate part C of the lower belt member 1 is drawn inward by the amount by which the sheet material is picked up, and is an outer edge 1s that is bound by the rectangular virtual line 1k. In this respect as well, the same effect of suppressing the rubbing in the crotch as in the case of the hourglass shape of the absorbent core and the effect of preventing the overturn when the pants-type diaper is worn.

  FIG. 4 is a partial cross-sectional perspective view seen from the cross-section taken along the line AA in FIGS. 1 and 2, and shows only the lower belt member 1 as a shape in a wearing state similar to that in FIG. 4A is a partially sectional perspective view in the above sense, and FIG. 4B is a portion indicated by b in FIG. 4A (from the tack portion 5 on the right side of the drawing to the side that is leg gathers). It is the expanded sectional view (end view) which expanded the area | region to the standing gathers 9). The same applies to FIGS. 5 and 6 below. As shown in the figure, the basic constituent members of the lower belt member 1 are a top sheet 6, a back sheet 8, and an absorbent core 4, and the top sheet is provided in the center of the skin surface with the absorbent core interposed therebetween. 6, the back sheet 8 disposed on the non-skin surface side is wound up on the skin surface side on both sides in the width direction (X direction), and is formed so as to cover the top sheet 6 beyond the tack portion 5. Yes. On both sides in the width direction of the lower belt member 1, string-like elastic elastic members 74 for leg gathers extend in the longitudinal direction and are arranged in three on each side (in the illustrated case, two are shown as two). )), This part stands up in a natural shape or wearing state. The top sheet 6, the back sheet 8, and the absorbent core 4 may be joined appropriately as necessary. For example, the top sheet 6, the back sheet 8, and the absorbent core 4 may be joined by a hot melt method using different patterns in a dotted, linear, planar, or spiral shape. I can do it.

  In this Embodiment 1, the tack part 5 is formed so that it may protrude to the skin surface side. The tack portion is U-shaped in cross section, and is disposed so as to be sandwiched between the back sheets 8 on which the string-like tack portion elastic elastic members 75 extending in the longitudinal direction are superimposed on the folded top portion 5a. Has been. The adhesion method of the tack part elastic elastic member 75 at this time is not specifically limited, Usually, the method of adhering between the elastic elastic member of this kind article | item and sheets, such as a nonwoven fabric, is employ | adopted suitably. And the surface sheet 6 and the back surface sheet 8 are laminated | stacked inside the side part 5b of a tack part (absorbent core side), and both sheets are joined by this location u. That is, the sheet material constituting the hydrophilic topsheet 6 to the water repellent backsheet 8 is switched at the inner portion u of the tack portion. By doing in this way, even if excrement such as urine once held by the absorbent core 4 tries to leak out to the outside G, it remains in the transition by the top sheet 6, and the water-repellent back surface inside the tack portion. When the sheet 8 is reached, the transfer of the liquid or the like is reliably blocked. As a result, the tack portion 5 has a very high leakage barrier function, and even when a large amount of excrement such as adult urination is processed for a long time, it is released from concerns such as side leakage and continues to be worn with peace of mind. be able to.

  The back sheet facing the base portion (base) 5c where the sheet material of the inseam flap portion H, which has been picked so as to maintain and sustain the standing property and the shape stability of the tack portion 5 as described above, is abutted. The two are joined through the fixing portion 5d. The process part 5d may be formed by any method as long as it has a stable fixed state. However, in consideration of stronger and more durable bondability, for example, the process part 5d may be bonded with a hot melt adhesive having a strong adhesive force. Further, they may be joined by heat sealing or heat embossing.

  As a further important function of the tack part in the first embodiment, it is possible to significantly improve the fit of the wearer to the skin surface at the inseam directly below P and its surroundings Q and O (see FIGS. 2 and 4). . That is, the adhesiveness to the skin surface of the wearer, which improves the prevention of liquid flow and leakage immediately below and around the crotch, that is, from the wearer's anus to the urination region, is remarkably improved. In particular, as in the present embodiment, when the sand core shape that is largely constricted at the crotch part is adopted as the absorbent core 4 that is somewhat rigid with respect to the sheet material, as described above, the immediately below the crotch P and its surroundings. The bulge deformation to the non-skin surface side becomes remarkable, and the part which is originally required to be firmly attached tends to be lifted. According to the present invention, problems peculiar to such an hourglass-shaped absorbent core can be preferably solved.

  The improvement of the adhesiveness of the diaper in the crotch part in the diaper of Embodiment 1 further gives a great sense of security to the wearer. Like the conventional one, the inner surface of the diaper tends to float at this part, and if it is away from the skin surface, even if it is before excretion, it may not be possible to catch excrement firmly, Some instability may remain and may make the wearer feel uncomfortable. Such a sensation tends to be held as a big problem even if it is sensual. That is, in the diaper of the first embodiment, the tuck portion 5 is disposed in the crotch intermediate portion C corresponding to the periphery thereof from directly under the crotch, and the diaper portion of the crotch portion is well positioned on the skin side of the wearer due to the action of the pinching And the curvature direction is reversed to form a saddle surface shape, and it fits suitably corresponding to the curvature formed by the inner thigh and the crotch that undulates in a complicated manner. As a result, a comfortable wearing feeling is realized without giving the wearer a feeling of anxiety as described above.

The height h ₁ of the tack part 5 is not particularly limited, and the length of the above-described leakage preventing wall action and the constituent sheet material of the flap part to be picked (the total of the base part 5c, the side part 5b, and the top part 5a of the tack part cross section) corresponding to the sheet length.) may be appropriately determined in relation to the pulling amount of the diaper crotch part according However, for example, it is preferable that the height h ₁ and 20~100mm in diapers for adults. Moreover, the ratio (h ₁ / h ₂ ) of the tack height h ₁ to the standing height h ₂ of the leg gathers is preferably 1 or less, and more preferably 0.55 to 0.85.

  FIG. 5 is a partial cross-sectional perspective view of a disposable diaper according to another preferred embodiment (Embodiment 2) of the present invention when viewed from the same cross section as FIG. In the second embodiment, unlike the first embodiment, the tack portion 5 protrudes to the non-skin surface side. By doing in this way, the inner space T of the tack portion 5 performs a trap function, and even if there is excretion liquid or the like that has migrated from the absorbent core due to side leakage, the width direction outer side G is taken into the space T. Hinder the transition to. In consideration of such a trap function, in the second embodiment, the sheet material is switched from the hydrophilic topsheet 6 to the water repellent backsheet 8 at a location u outside the tack portion 5.

In the second embodiment, the elastic elastic member 75 of the tack portion is disposed on the folded base portion 5c of the tack portion. By doing so, the longitudinal direction in the length direction of the tack is easily bent, and as a result, an entrance of a space for trapping the liquid is easily formed, so that the liquid can be trapped more easily. It is the same as that of the said Embodiment 1 that the sheet | seat parts which faced through the fixing | fixed part 5d are joined by this base part 5c. Moreover, the effect that the diaper part directly under the crotch and its periphery is pulled up by the tack part 5 of the second embodiment and the adhesion is improved is the same as that of the first embodiment. The height h ₃ of the tack portion protruding non-skin side (back) side in the present embodiment is not particularly limited, for example, preferably 10~50mm about in the diaper for adults.

  FIG. 6 is a partially sectional perspective view of a disposable diaper according to another preferred embodiment (Embodiment 3) of the present invention when viewed from the same cross section as FIG. In the third embodiment, the tack portion 5 is protruded to the non-skin surface side, and is further folded and folded in the width direction outward G by the base portion 5c. By doing in this way, it is the same as that of the said Embodiment 2 that the internal space T of the tack part 5 fulfill | performs a trap function. Furthermore, when the wearer excretes in a sideways state, the liquid flowing on the diaper surface can be easily trapped, and the trapped liquid can easily flow to the absorber 4 side. This makes it difficult for the liquid to flow directly, and is effective in preventing leakage. The width w of the tucked portion is not particularly limited, but can be 10 to 50 mm in an adult diaper, for example.

In the third embodiment, the tack elastic elastic member 75 is disposed on the folded top portion 5a of the tack portion, and the sheet portions that face each other through the fixing portion 5d are joined to each other at the base portion 5c. The top part 5a of the tuck part that has come into contact with and a part of the constituent sheet material (the back sheet 8) of the crotch flap part toward the outer side G of the side upright gathers 9 are joined via the fixing part 5e. Thereby, even when the space of the trap is crushed when sitting, the trap space is easily expanded by the tack elastic elastic member 75, so that a higher trap can be obtained. In addition, the effect that the diaper part immediately under the crotch and its periphery is pulled up by the tack part 5 of the third embodiment and the adhesion is improved is the same as in the first and second embodiments.

  Since the diaper of each of the above embodiments can be attached and detached in the form of a pants at the start of use, the wearer who can attach and detach in a standing state with a high degree of independence can meet the need to wear pants by himself. it can. In addition, the shape of the absorbent core with an hourglass shape that is constricted in the center as described above, and a unique structure with tacks on the flaps on both sides of the constriction, make it inadvertent when the wearer passes his feet. It is very easy to wear and can prevent the wearer from falling. In addition, since it can be used in the same manner as the unfolded diaper by rejoining with the fastened tape that has been cut off and taken out, it is possible to replace it even when lying down. It is easy and the assistant can change diapers easily. Due to such advantages, the diaper of the present invention is particularly suitable as a diaper for rehabilitation of elderly people and persons with physical disabilities who need assistance but also need independent training.

  As each constituent material of the disposable diaper of this invention, the various materials normally used can be especially used without a restriction | limiting. For example, it is preferable that the sheet material used for the part in contact with the skin is a material having a good touch, such as a nonwoven fabric or a cloth. The absorbent core is preferably, for example, a fiber aggregate made of fibers such as defibrated pulp or crimped acetate fiber tow, or a fiber aggregate holding a water-absorbing polymer. As a material of each elastic elastic member, a normal elastic material used for absorbent articles can be used. For example, as a material, synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA , Stretchable polyolefin, polyurethane, etc. The shape of the cross section is rectangular, square, circular, polygonal or other thread-like or string-like (flat rubber etc.), or multifilament type thread-like Can be used. As a male member and a female member of a mechanical fastener, normal mechanical fasteners such as “Magic Tape (registered trademark)” (manufactured by Kuraray), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu ( (Registered trademark) "(manufactured by Kanebo Bell Touch Co., Ltd.) and the like can be used. As the female member of the mechanical fastener, a material that can be directly engaged with the female member, for example, a non-woven fabric with high engagement can be used.

  The disposable diaper of this invention is not restrict | limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention. For example, instead of a mechanical hook-and-loop fastener, an adhesive part formed by applying an adhesive can be provided. Moreover, as a break guide line, if there is an effect as a cut line, it can be used without particular limitation. For example, as long as the strength of the breaking strength is formed along the guide wire by heat sealing, ultrasonic sealing, etc., the presence or absence of holes does not matter. Moreover, the disposable diaper of this invention may be for infants other than those for adults shown in the above embodiments.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to this.

[Example]
A diaper test body 1 having a tuck portion shown in FIG. 4, a diaper test body 2 having a tack portion shown in FIG. 5, and a tack shown in FIG. A diaper specimen 3 having a part was prepared.

[Reference example]
A diaper specimen c1 for comparison was produced in the same manner as in the example except that the tack portion was not provided.

[Evaluation of crotch fit]
As shown in the schematic front view of FIG. 7, the model doll 61 is placed with the diaper test bodies 1 to 3 and the diaper test body c1, from the skin surface directly below the crotch to the surface of the diaper exterior band in the vertical direction. The distance L was measured. The results are shown in Table 1.

[Evaluation of wearing feeling]
Ask the subject (panel) to wear the diapers of the diaper test samples 1 to 3 of the example and the diaper test body c1 of the reference example as the pants type and the unfolded type, respectively, and then wear the diaper of the reference example first, The diaper of each Example was mounted | worn, and the grade which is worried about the discomfort of a crotch part was evaluated as the mounting | wearing feeling. “O” was evaluated as “O” when the feeling of discomfort was not noticed in a shorter time than the diaper of the reference example, and “△” was evaluated as “A time when the feeling of uncomfortable feeling was the same as in the reference example”.

[Liquid leakage prevention evaluation]
The model doll 100 provided with the urination point 105 was placed with the diaper test bodies 1 to 3 of the example and the diaper test body c1 of the reference example, and the model doll 100 was tilted at an inclination angle of 30 degrees. FIG. 8 is an explanatory view of this state as viewed from the crotch side. From the excretion point 105 provided in the model doll 100, physiological saline was discharged at an excretion amount of 50 g / time and an excretion rate of 5 g / s. After this discharge was repeated at intervals of 5 minutes, the amount of liquid absorbed until the physiological saline leaked from the diaper (a value obtained by subtracting the leaked amount from the total excretion amount) was measured. The test was conducted at 25 ° C.
The results are shown in Table 2.

[Table 1]
-------------------------------
Diaper test piece Distance L Wear feeling Liquid absorption amount ------------------------------
1 35mm △ 500g
2 25mm ○ 400g
3 10mm ○ 450g
c1 65mm-350g
-------------------------------

  As shown in Table 1, the distance (L) between the diaper and the model crotch is shorter in the diaper test body of the example provided with the crack-compatible elastic elastic member as compared with the diaper of the reference example. The amount of absorption was also greatly improved, and liquid leakage could be sufficiently prevented. In addition, when worn in a pant-type, it was evaluated that worries such as falling over when using the foot were reduced.

It is the perspective view seen from the ventral side which shows typically the disposable diaper as one embodiment (this Embodiment 1) of the present invention. FIG. 2 is a partially cutaway developed plan view showing a state in which a breakage guide line of the diaper of FIG. 1 is broken and unfolded as viewed from the surface sheet side. It is a perspective view which shows the state which fractured | ruptured the fracture | rupture guide line of one side of the diaper of FIG. FIG. 4A is a partial cross-sectional perspective view showing the lower band member of the disposable diaper shown in FIG. 1 as viewed from the line AA, and FIG. 4B is a view of the region b in FIG. It is an expanded sectional view. FIG. 5 (a) is a partially sectional perspective view of a disposable diaper as another embodiment (second embodiment) of the present invention, as seen from a section corresponding to FIG. 4, and FIG. It is an expanded sectional view of the area | region b of Fig.5 (a). FIG. 5A is a partial cross-sectional perspective view seen from a cross-section corresponding to FIG. 4 schematically showing a disposable diaper as another embodiment (third embodiment) of the present invention, and FIG. These are the expanded sectional views of the area | region b of Fig.5 (a). It is explanatory drawing of the crotch part fitting state evaluation test of an Example. It is explanatory drawing of the liquid-leakage prevention evaluation test of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower belt member 2 Annular exterior belt 21 Abdominal side part 22 Back side part 24 Breaking induction line (perforation)
DESCRIPTION OF SYMBOLS 3 Fastening tape 4 Absorbent core 6 Top sheet 8 Back sheet 10 Disposable diaper 33 Side seal part 72, 73, 74, 75 Elastic elastic member

Claims (2)

An hourglass-shaped absorbent core having a wide portion on both sides in the longitudinal direction and a constricted portion therebetween is disposed in the plan view, the wide portion is disposed on the abdomen side and the back side of the wearer, and the constricted portion is disposed on the crotch. The diaper has a crotch flap portion extending outward in the width direction of the constricted portion of the absorbent core, and a sheet material constituting the crotch flap portion is provided on the diaper. There is a tack portion that extends in the longitudinal direction, which is U-shaped with a folded top, side and base in the cross section,
The tack part does not include the absorbent core and is formed by joining sheets facing each other at the base part, and an elastic elastic member is disposed on the folded top part, side part, or base part,
On the skin surface side of the crotch flap portion, the hydrophilic sheet inside in the width direction and the repellent width outside in the width direction are formed on the side portion on the inner side in the width direction of the tack portion or on the outer side in the width direction from the tack portion. It has a switching part of the aqueous sheet,
The tack part of the crotch flap part protrudes to the non-skin surface side, an elastic elastic member is disposed on the base part of the tack part, and the tack part is bent at the base part to outward in the width direction. and is laid down,該倒Fushimi been tuck disposable diaper top portion that is bonded to the sheet material of the non-skin side of the crotch flap portion. A pant-type and deployment comprising: an annular outer band extending around the wearer's waist; and a lower band member that is joined to the inner surface of the abdomen and the back side of the outer band and is suspended along the crotch A disposable diaper for both types of molds,
The ventral side portion of the annular sheathing band can be cut along the breaking guide line there to be separated from the lower band member and opened in a double door, and a fastening tape that can be pulled out by cutting the breaking guide line includes the breaking guide. It is fixed and stored on the side where the annular outer strip is separated in the vicinity of the line,
The lower band member claims wherein having an absorbent core of the hourglass shape, the tuck the crotch flap portion of the lower band member extending outward in the width direction of the central constricted part of the absorbent core is provided Item 1. A disposable diaper according to item 1 .

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