TW201932085A - Pants-type absorbent article - Google Patents

Abstract

Provided is a pants-type absorbent article (1) wherein: a ventral torso part (20) and a dorsal torso part (30) have a ventral-torso elastic member (23) and a dorsal-torso elastic member (33), respectively; an absorber core (11A) has a front-side core part (11Af) and a back-side core part (11Ab); the front-side core part (11Af) has a narrow-width section (11n) above a lower end of the ventral torso part (20), and also has, in the vertical direction, an upper region (U) where the ventral torso part (20) overlaps with an upper section (11u) of the front core part (11Af), and a narrow-width region (N) where the ventral torso part (20) overlaps with a narrow-width section (11fn) of the front core part (11Af); and the relation FN/WN < FU/WU is satisfied, where WU and WN respectively represent the length of the upper region U and the length of the narrow-width region N in the vertical direction, FU and FN respectively represent the force required to stretch the upper region U by a unit length and the force required to stretch the narrow-width region N by a unit length in the right-left direction.

Description

Shorts-type absorbent article

The present invention relates to a pant-type absorbent article.

Conventionally, as an example of an absorbent article, a shorts type disposable type is known. For example, Patent Document 1 discloses a pant-type disposable diaper 1 having an abdominal sheet member 2, a back sheet member 3, and an absorbent core 5. The diaper 1 shown in Patent Document 1 is provided with a front narrowed portion 5f on the absorbent core 5 to make it easier for a wearer to walk.
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2013-13683

[Problems to be Solved by the Invention]

Since the absorptive core 5 is provided on the outer side in the left-right direction of the front narrowed portion 5f, the abdominal sheet member 2 including the elastic member 7 is formed to directly contact the skin. When the diaper 1 is worn, marks on the elastic member 7 contracted toward the skin of the wearer are easily generated on the outside of the front narrowed portion 5f in the left-right direction, and wrinkles of the abdominal sheet member 2 contracted by the elastic member 7 are easily generated. Mark of. In particular, since the outer side of the front narrowed portion 5f in the left-right direction is a portion that abuts against the rat's crotch portion of the wearer's active part, there will be movements corresponding to the wearer's active part, and the wearer will wear The user's skin is concerned about red marks caused by the contraction of the elastic member 7.

The present invention has been developed in view of the problems described above, and aims to both ensure the movement of the leg circumference during wearing and improve the feeling of wearing felt by the wearer.

[Means for solving problems]

The main invention for achieving the above object is a shorts-type absorbent article, which has an up-down direction, a left-right direction, and a front-back direction, and has an absorptive core, a ventral waistline portion, and a backside waistline portion. The absorptive article is characterized in that the abdomen waistline portion and the dorsal waistline portion each have an abdomen waistline telescopic member and a dorsal waistline telescopic member that expand and contract in the left-right direction, and the absorptive core is folded in half. It has a front core portion located on the front side and a rear core portion located on the rear side. The front side core portion is shorter on the upper side than the lower end of the ventral waistline portion, and the length in the left-right direction is shorter than the upper portion. The narrow portion in the vertical direction includes an upper region in which the abdominal waist portion overlaps the upper portion of the front core portion, and a narrow region in which the abdominal waist portion overlaps the narrow portion of the front core portion. In the direction, the length of the upper region is WU, the length of the narrow region is WN, and in the left and right directions, the upper region is elongated. When the force for bit length is set to FU and the force for elongation of the aforementioned narrow region by only a unit length is set to FN, FN / WN <FU / WU.
Other features of the present invention will be apparent from the description of this specification and the drawings.

[Effect of the invention]

According to the present invention, by reducing the tightening force in the narrow area, the abutment force on the skin in the above-mentioned area is suppressed. On the other hand, by further tightening the tightening force in the upper area, it can be absorbed during wearing and shorts. The fear of falling off of sex items is alleviated.

At least the following matters are understood from the description in this manual and the attached drawings.
A shorts-type absorbent article has an up-down direction, a left-right direction, and a front-back direction, and has an absorptive core, a ventral waistline portion, and a back-side waistline portion. The shorts-type absorbent article is characterized in that: The side waistline portion and the backside waistline portion are each provided with a ventral waistline telescopic member and a backside waistline telescopic member that expand and contract in the left-right direction. The absorptive core is folded in half and has a front core portion located on the front side. The rear core portion located on the rear side, the front core portion is a narrow portion having a shorter length in the left-right direction than an upper portion on the upper side than the lower end of the ventral waistline portion, and in the up-down direction: An upper region where the abdominal waist section overlaps the upper part of the front core part; and a narrow region where the abdominal waist section overlaps the narrow part of the front core part; in the up-down direction, the length of the upper region is set WU, the length of the narrow region is WN, and in the left-right direction, the force for elongating the unit length of the upper region is FU, and the narrow Only the time domain with the elongation per unit length is defined as the force FN, FN / WN <FU / WU.

According to such a shorts-type absorbent article, the tightening force of the narrow region is reduced, and the abutment force on the skin in the above-mentioned area is suppressed. On the other hand, the tightening force of the upper region is further increased to allow wearing. In the middle and shorts type absorbent articles, the fear of falling is reduced.

In such a shorts-type absorbent article, it is desirable that the elastic coefficient of the narrow telescopic member disposed in the narrow region among the abdominal waist elastic members is smaller than that of the upper telescopic member disposed in the upper region.

According to such a shorts-type absorbent article, by reducing the tightening force of the narrow area, the abutment force on the skin of the area between the narrow portion of the front core and the leg is suppressed, and the upper area is further enlarged The tightening force can reduce the worry of falling of the shorts-type absorbent article during wearing.

In such a shorts-type absorbent article, an area overlapping the upper region in the front-rear direction of the back waist region is an upper back region, and an area of the back waist region overlapping the narrow region in the front-rear direction is The area is the back lower area. When the force for extending the unit length of the back upper area is FB in the left-right direction and the force for extending the unit length of the back lower area is FD, FD / WN < FB / WU is expected.

According to such a shorts-type absorbent article, it is possible to suppress the contact force of the skin between the narrow part of the absorptive core and the part sandwiched by the legs on the ventral side, and further, it is possible to cause the shorts-type absorbent article to fall during wearing. Lighten.

In such a shorts-type absorbent article, an area overlapping the upper region in the front-rear direction of the back waist region is an upper back region, and an area of the back waist region overlapping the narrow region in the front-rear direction is The region is the lower back region. When the force for extending the unit length of the lower back region in the left-right direction is FD, FN / WN <FD / WN is desirable.

According to such a shorts-type absorbent article, the abutment force on the skin of the area sandwiched between the narrow portion of the absorbent core and the leg is suppressed on the ventral side, and the shorts-type absorbent article can be dropped further during wearing. The concerns are alleviated.

In such a shorts-type absorbent article, an area overlapping the upper region in the front-rear direction of the back waist region is an upper back region, and an area of the back waist region overlapping the narrow region in the front-rear direction is The region is the lower back region. In the left-right direction, the force for extending the unit length of the upper back region is FB, and the force for extending the unit length of the lower back region is FD. FD / WN <FB / WU, FN / WN <FD / WN is desirable.

According to such a shorts-type absorbent article, it is possible to suppress the contact force of the skin between the narrow part of the absorptive core and the part sandwiched by the legs on the ventral side, and further, it is possible to cause the shorts-type absorbent article to fall during wearing Lighten.

Such a shorts-type absorbent article has a pair of leg openings, the leg openings having leg expansion and contraction regions that expand and contract in the up-down direction, and the lower side abdomen of the abdominal waist expansion and contraction member that is located most on the lower side. It is desirable that the side waistline telescopic member intersects at least a part of the leg circumference telescopic area.

According to such a shorts-type absorbent article, since the leg openings are fitted to the wearer's legs by the extension of the lower ventral waist elastic members and the leg elastics, the leg openings can be easily extended to ring.

Such a shorts-type absorbent article has an absorbent body including the absorbent core, the abdominal waist portion includes a skin-side sheet portion and a non-skin-side sheet portion, and the narrow region is in the front-back direction, It is desirable that the absorptive body, the skin-side sheet portion, the non-skin-side sheet portion, and other sheet portions overlap.

According to such a shorts-type absorbent article, the rigidity of a narrow area can be improved by superposing another sheet part, and the tightening force in a narrow area can be reduced.

In such a shorts-type absorbent article, it is desirable that all of the abdominal waist elastic members and the other sheet portions arranged in the narrow region overlap each other in the front-rear direction.

According to such a shorts-type absorbent article, the tightening force in a narrow area can be further reduced.

In such a shorts-type absorbent article, it is desirable that the length in the vertical direction of the narrow region is longer than the length in the vertical direction of the upper region.

According to such a shorts-type absorbent article, when the length in the up-down direction of the narrow region is shorter than the length in the up-down direction of the upper region, it is possible to reduce the deterioration of the absorptive core leg fit on the ventral side or the absorption. The sexual core matches the body's movements and stays away from body concerns.

Such a shorts-type absorbent article has a pair of leak-proof walls, and the pair of leak-proof walls are provided with a leak-proof wall elastic member, a fixing portion which cannot stand up to the skin side, and can stand up to the skin side It is desirable that the lower end of the fixed portion is located on the upper side than the lower end of the upper region.

According to such a shorts-type absorbent article, since the lower end of the fixing portion is lower than the lower end of the upper region, a region for raising the rising portion of the leak-proof wall can be provided more widely, so it can be further Relieves fear of excreta leakage.

In such a shorts-type absorbent article, the ventral waistline portion has a stretchable region that expands and contracts together with the ventral waistline telescopic member, and a non-stretchable region that does not stretch, and the left and right sides of the non-stretchable region in the narrow region. The length in the direction is preferably longer than the length in the left-right direction of the absorbent core in the upper portion.

According to such a shorts-type absorbent article, when the length in the left-right direction of the non-stretchable region is shorter than the length in the left-right direction of the absorbent core in the upper portion than in the narrow region, the tightening force in the narrow region can be reduced.

=== Embodiment ===
<<< Basic structure of short-sleeved disposable diapers >>>
FIG. 1A is a schematic perspective view of a shorts-type disposable diaper 1. FIG. 1B is a diagram showing an example of a wearing state of the diaper 1. FIG. 2 is a schematic plan view of the diaper 1 in an expanded state and an extended state as viewed from the skin side. FIG. 3 is a schematic cross-sectional view taken along a line AA in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along a BB arrow in FIG. 2. The “expanded state” means that the side portions 20 a of the abdominal waist portion 20 and the side portions 30 a of the back waist portion 30 of the diaper 1 are separated from each other, and the opened diaper 1 is unfolded as a whole. status. The “stretched state” indicates a state where the stretchable member provided in the diaper 1 is stretched to such an extent that wrinkles of the diaper 1 cannot be considered to be stopped. Specifically, it shows a state where the size of each member (for example, the abdominal waist portion 20 and the like described later) constituting the diaper 1 is extended to the size of the member alone or close to this size. The CC line in FIG. 2 is the center line in the left-right direction. In FIG. 3, the adhesive is omitted for convenience.

As shown in FIG. 1, the shorts-type diaper 1 has an up-down direction, a left-right direction, and a front-rear direction. The diaper 1 is formed with a waist opening BH and a pair of leg openings LH. In the up-down direction, the waist opening BH side is taken as the upper side, and the side that becomes the crotch of the wearer is taken as the lower side. The up and down direction of the diaper 1 in the state of FIG. 2 (expanded and stretched state) is also referred to as a "long side direction", one side of the long side direction is referred to as "ventral side", and the other side is referred to as "back side". The side of the substantially central portion C10 in the longitudinal direction is also referred to as a "lower side". In the front-back direction, the side that becomes the ventral side of the wearer is taken as the front side, and the side that becomes the back side of the wearer is taken as the back side. Moreover, the diaper 1 has a thickness direction as shown in FIG. 3, and the side which contacts a wearer in the thickness direction is made into the skin side, and the other side is made into the non-skin side.

The diaper 1 is a so-called three-component type, and has an absorptive body 10, an abdominal waist portion 20, and a back waist portion 30. The abdominal waistline 20 covers the wearer's belly, and the back waistline 30 covers the wearer's back. The absorbent body 10 has a substantially rectangular shape when viewed from above. As shown in FIG. 3, the upper end portion on the ventral side and the upper end portion on the back side of the absorbent body 10 overlap the skin side surfaces of the waistline portions 20 and 30, respectively. The abdominal waistline portion 20 and the back waistline portion 30 are substantially rectangular in a plan view, and the longitudinal directions thereof are along the left-right direction.

As shown in the unfolded state in FIG. 2, the diaper 1 has a left-right symmetrical shape with respect to the center line C-C. The non-skin side surface of the absorptive body 10 and the upper side portion of the back side of the absorbent body 10 are joined with an adhesive or the like (not shown), and the skin side surfaces of the waistline portions 20 and 30 are unfolded from each other as shown in FIG. 2. In the state, the absorptive body 10 is folded in half at the central portion C10 so that the abdominal waistline portion 20 and the backside waistline portion 30 face each other, and the left and right side portions 20a of the abdominal waistline portion 20 and the backside waistline portion 30 are joined. The diaper 1 is formed into a pant type on both side portions 30a in the left-right direction.

The abdominal waistline 20 and the back waistline 30 are each provided with soft skin-side sheets 21 and 31 and non-skin-side sheets 22 and 32 made of non-woven fabric, and waist-side stretchable members 23 and 33, respectively. With the waist circumference stretchable members 23 and 33, the abdominal waistline portion 20 and the back waistline portion 30 are stretchable and fit to fit the waistline of the wearer. The skin-side sheets 21 and 31 and the non-skin-side sheets 22 and 32 are non-stretchable sheets which are substantially non-stretchable in the left-right direction with respect to each of the individual sheets. For the skin-side sheets 21 and 31 and the non-skin-side sheets 22 and 32, SMS nonwovens (spunbond, meltblown, and spunbond nonwovens), spunbond nonwovens, hot air nonwovens, plastic sheets, open-hole plastic sheets, and the like can be used. And other laminated sheets.

The non-skin-side sheet 22 of the abdominal waistline portion 20 includes a non-skin-side sheet portion 22a, a folded-back upper end portion 22u, and a folded-back lower end portion (other sheet portion) 22b. The non-skin-side sheet portion 22 a is the thinnest portion of the non-skin-side sheet 22 located on the non-skin side. The folded-back upper end portion 22u is a portion where the non-skin-side sheet 22 is folded back toward the skin side. The folded-back lower end portion 22b is a portion where the non-skin-side sheet 22 is folded back toward the skin side. The folded-back upper end portion 22u is provided on the skin side of the absorbent body 10, and the folded-back end portion 22b is provided on the non-skin side of the absorbent body 10. An upper end portion of the non-skin-side sheet 32 of the back waistline portion 30 is formed with a folded-back upper end portion 32u that is folded back toward the skin side.

The abdominal waist elastic member 23 is a plurality of silk rubbers 23a that expand and contract left and right, and an elastic sheet 23b that expands and contracts in the vertical and horizontal directions. The silk rubber 23a is positioned between the skin-side sheet 21 and the non-skin-side sheet 22, and is fixed in a state of being extended in the left-right direction with the entire region excluding the upper end portion of the abdominal waistline 20 being spaced apart in the vertical direction. The stretchable sheet 23b is disposed between the non-skin-side sheet 22 and the skin-side sheet 21 turned back from the non-skin side to the skin side. The upper end portion is fixed in a state of being extended in the left-right direction. The stretchable sheet 23b is a non-woven fabric to which an appropriate stretching process such as gear rolling is applied, a plastic stretchable film sheet, etc. The nonwoven fabric includes a polyurethane-based elastomer having elastic thermoplastic elastomeric fibers, and Polypropylene (PP), a polyolefin resin with non-elastic thermoplastic resin fibers.

In this way, the silk rubber 23a is not disposed on the upper end portion of the abdominal waistline portion 20, and the elastic sheet 23b is disposed so that the upper end portion of the abdominal waistline portion 20 is surface-adhered to the wearer. Therefore, it is possible to suppress the tightening of the abdominal area, and it is not easy to leave a tightening mark on the skin due to the abdominal waist elastic member 23. In particular, since the abdomen of an infant protrudes toward the front from the dorsal side, it is desirable to reduce the fear that the abdominal waistline 20 is tightened locally.

The back waist elastic member 23 is a plurality of silk rubbers 33 that extend and contract in the left and right direction and are spaced apart from the upper end portion of the back waist portion 30 across the lower end portion in the up and down direction. 32 is fixed in a state where it is extended in the left-right direction.

In addition, the abdominal waistline portion 20 and the backside waistline portion 30 each include: telescopic regions Df, Db that are retractable together with the abdominal waistline telescopic member 23 and the backside waistline telescopic member 33; and the abdominal waistline telescopic member 23 and the back The non-stretchable regions Ff and Fb which the side waistline telescopic members 33 expand and contract together. FIG. 5 is a diagram illustrating the stretched areas Df and Db and the non-stretched areas Ff and Fb. In FIG. 5, the stretched areas Df and Db are shown by hatching diagonal lines in the lower right, and the non-stretched areas Ff and Fb are shown by hatching diagonal lines in the lower left. The non-stretchable regions Ff and Fb are rectangular in the central portions in the left-right direction of each of the abdominal waist portion 20 and the back waist portion 30, and are provided in areas overlapping the absorbent core 11A in the front-rear direction. By providing the non-stretchable regions Ff and Fb, the concern that the absorbent core 11A is contracted in the left-right direction and deformed due to the contraction of the telescopic members 23 and 33 is alleviated.

Fig. 4 is a schematic cross-sectional view taken along the arrow B-B in Fig. 2. FIG. 4 shows the thickness direction in such a way that the structure can be easily understood, and the dimensions are appropriately changed. As shown in FIG. 4, the absorbent body 10 includes a pair of leak-proof wall members 15, a top sheet 12, an absorber 11, a back sheet 13, and an exterior sheet 14 in this order from the skin side in the thickness direction. Then, they are adhered by an adhesive such as a thermally fusible material.

The top sheet 12 may be a liquid-permeable sheet, and examples thereof include a hydrophilic hot-air nonwoven fabric, a spunbond nonwoven fabric, and the like. The back sheet 13 may be a liquid-impermeable sheet, and examples thereof include a polyethylene film, a polypropylene film, and a hydrophobic SMS nonwoven fabric. The top sheet 12 and the back sheet 13 are sized to cover the entire absorbent body 11. The leak-proof wall member 15 and the exterior sheet 14 may be a liquid-permeable sheet or a liquid-impermeable sheet, and a hydrophobic SMS nonwoven fabric or the like may be exemplified. However, in this embodiment, since the leak-proof wall member 15 and the exterior sheet 14 form the leak-proof wall portion 50 and the leg ruffled portion 60, respectively, the leak-proof wall member 15 and the exterior sheet 14 are liquid-impermeable. The composition of the material is ideal.

The pair of leak-proof wall members 15 constitute a pair of leak-proof wall portions 50. The pair of leak-proof wall portions 50 are so-called three-dimensional frills, and are provided on both sides of the absorbent body 11 in the left-right direction along the longitudinal direction of the absorbent body 10. Specifically, the crease portion of the leak-proof wall member 15 that is folded in half with the plurality of leak-proof wall telescopic members 51 sandwiched inside is arranged on the inner side of the left-right direction, and from the left-right side of the absorbent body 10 The end is provided at a position where the side portions superposed on the left-right direction of the absorbent body 11 are superposed.

FIG. 6 is a schematic diagram illustrating a configuration of a schematic plan view of FIG. 2. 6 is conveniently omitted from the schematic plan view of FIG. 2, and the waist telescoping members 23 and 33, the slits S, and the like are omitted. The pair of leak-proof wall portions 50 includes a pair of end joint portions 52 and a pair of side joint portions 53 that join the leak-proof wall member 15 to the exterior sheet 14 and the top sheet 12, and a longitudinal direction (up and down direction). A plurality of telescopic leak-proof wall telescopic members 51 includes a pair of fixing portions 55 and 55 that cannot stand on the skin side, and a pair of standing portions 56 that can stand on the skin side. In the leak-proof wall portion 50, each region from the upper end on the side of the abdominal waistline portion 20 to the lower end of the end joint portion 52 and from the upper end of the side of the backside waistline portion 30 to the lower end of the end joint portion 52 is the fixing portion 55. . Further, in the leak-proof wall portion 50, the lower end of the end joint portion 52 in the side of the abdominal waistline portion 20 is lower, and the lower end of the end joint portion 52 in the side of the backside waistline portion 30 is lower. The area is the rising portion 56. The leak-proof wall portion 50 can block excretion in the side flow.

The pair of end joints 52 and the pair of side joints 53 are portions that are joined with an adhesive such as a hot-melt adhesive. In addition, the joining of the terminal joining portion 52 and the side joining portion 53 is not limited to the fixing by the adhesive, and may be fixed by pressing, pressing, or the like.

A pair of terminal joint portions 52 are disposed at both end portions in the longitudinal direction of the absorbent body 10, and are "adhesion portions" for preventing the fixing portion 55 from standing up to the skin side. The end joint portion 52 is provided at a position overlapping the upper end portion of the absorbent body 11 from the end of the absorbent body 10 in the longitudinal direction. The pair of side joints 53 includes one provided from one end to the other end in the longitudinal direction of the absorbent body 10 and one provided from the ventral end of the absorbent body 10 to the central portion C10 in the longitudinal direction. Each of them is arranged on the outer side in the left-right direction than the end joint portion 52.

The leakage preventing wall portion 50 is formed by the contraction of the leakage preventing wall telescopic member 51, and the rising portion 56 can be raised toward the skin side at the side joint portion 53 based on a portion adjacent to the inside from the left and right directions. In addition, a plurality of leak-proof wall telescopic members 51 are separately provided, and in a standing state of the leak-proof wall portion 50, it is easy for the leak-proof wall portion 50 to contact the skin of the wearer by the surface, and the skin can be touched. Sense of improvement.

The exterior sheet 14 is a pair of leg ruffle portions 60 including the leg telescopic members 16. The leg ruffle portion 60 is a portion forming the leg circumference opening portion LH, and is fitted to the leg of the wearer by the contraction of the leg circumference telescopic member 16.

Both end portions in the left-right direction are folded back inward, and leg-surrounding telescopic members 16 are arranged between the folded-back exterior sheets 14 to constitute a leg ruffle portion 60. The leg circumference telescoping member 16 is a plurality of silk rubbers along the longitudinal direction, and is folded back inward in the left-right direction to form a two-layer exterior sheet 14 to extend in the longitudinal direction of the absorbent body 10. Under is fixed.

When using silk rubber as the leg circumference telescopic member 16, it is preferable to arrange a plurality of pieces, and it is more preferable to arrange 5 or more pieces. In FIG. 2 and the like, eight leg-column telescopic members 16 are arranged in the left-right direction. It is assumed that when there is one leg circumference telescoping member 16, there is a concern that the wearer's legs are partially tightened, and by providing more leg circumference telescoping members 16, the entire leg ruffle portion 60 can be easily adhered to the face. It can reduce the concerns about the local tightening of the wearer's legs.

The absorbent body 11 has a substantially rectangular shape in plan view, and includes an absorbent core 11A that absorbs and retains liquid such as urine, and a core cladding sheet 11B that covers the outer peripheral surface of the absorbent core 11A. FIG. 7 is a diagram illustrating the absorber 11. Examples of the core cladding sheet 11B include liquid-permeable sheets such as tissue paper and nonwoven fabric. In FIG. 7, the absorptive core 11A covered with the core cladding sheet 11B is conveniently indicated by a solid line.

The absorbent core 11A is a liquid-absorbent fiber such as pulp containing a superabsorbent polymer (SAP), which is formed into a substantially hourglass shape. In this embodiment, the basis weight of the liquid-absorbent fiber of the absorbent core 11A is substantially uniform over the entire area of the absorbent core 11A. Of the absorbent core 11A, a portion located on the ventral side (front side) from the center portion C10 is the front side core portion 11Af, and a portion located on the back side (rear side) from the center portion C10 is the rear side core portion 11Ab. The rear core portion 11Ab is provided with a slit S penetrating the thickness direction (front-rear direction), so that the absorbent core 11A can easily follow the shape of the wearer's buttocks.

As shown in FIG. 7 and the like, the length in the left-right direction is shortened at the central portion in the longitudinal direction of the absorbent core 11A to narrow it. Specifically, a front narrow portion (also referred to as a "narrow portion") 11fn is provided below the upper portion 11fu of the front core portion 11Af, and a rear narrow portion is provided below the upper portion 11bu of the rear core portion 11Ab. 11bn. The length in the longitudinal direction of the front narrow portion 11fn is longer than the length in the longitudinal direction of the rear narrow portion 11bn. In addition, the narrowest portion 11n, which is the shortest length in the left-right direction of the absorbent core 11A, is provided in the front narrow portion 11fn of the front core portion 11Af. The length of the front narrow portion 11fn in the vertical direction is longer than the length of the rear narrow portion 11bn in the vertical direction.

As shown in FIG. 2, the diaper 1 has, in the up-down direction, an upper region U overlapping the abdominal waist portion 20 and the upper portion 11fu of the front core portion 11Af, and a front narrow portion 11fn overlapping the abdominal waist portion 20 and the front core portion 11Af. Overlapping narrow area N. In the pant-type diaper 1, the region of the rear waistline 30 which overlaps with the upper region U of the abdominal waistline 20 in the front-back direction is the backside upper region B, and overlaps with the narrow region N of the abdominal waistline 20 in the front-back direction. The region of the rear waistline portion 30 is the back lower region D. In other words, the pant-type diaper 1 is looped in the upper region U and the upper back region B, and is looped in the narrow region N and the lower back region D.

In the stretched state of the diaper 1, the lengths in the vertical direction of the upper region U and the backside upper region B are WU, and the lengths in the vertical direction of the narrow region N and the backside lower region D are WN. The length in the left-right direction of the upper region U, the upper back region B, the upper region U, and the upper back region B is W.

Among the abdominal waist telescoping members 23, the telescoping members arranged in the upper region U are upper telescoping members 23u, 23u, etc., and the telescoping members arranged in the narrow region N are narrow telescoping members 23n, 23n, and the like.

In general, infants often have their feet extended forward, so for the purpose of alleviating the concerns that the relatively rigid absorbent body 11 hinders the movement of infant legs, as shown in FIG. 7, the absorbent core The narrowest portion 11n of 11A is provided on the front core portion 11Af, and the length of the front narrow portion 11fn in the vertical direction is set longer than the length of the rear narrow portion 11bn in the vertical direction. Further, a front narrow portion 11fn is provided on the upper side than the lower end of the abdominal waist portion 20.

However, a front narrow portion 11fn is provided on the upper side than the lower end of the abdominal waist portion 20, and the abdominal member 20 including the abdominal waist telescopic member 23 is disposed on the outer side in the left-right direction of the front narrow portion 11fn. Region V of the core 11A (see FIGS. 1A and 2). Although the absorptive core 11A is more rigid than the abdominal waistline 20 and the like, since the absorptive core 11A is not provided in the region V, the region V easily transmits the contractile force of the abdominal waist elastic member 23 to the skin of the infant. In particular, in the wearing state, the area V is a portion that abuts on the navel of an infant and is therefore a portion with a lot of movement. Because with the movement of the infant, the contracted abdominal waist telescoping member 23 strongly abuts the skin of the infant in the region V, and there are traces of the contracted abdominal waist telescoping member 23 attached to the skin of the infant Concerns. In the region V, wrinkles of the abdominal waistline member 20 formed by the contraction of the abdominal waistline telescopic member 23 abut the skin of the infant and the skin of the infant may become red.

In the diaper 1, the contraction force in the left-right direction acting on the diaper 1 is increased, and the wearing feeling felt by infants can be improved. The contraction force in the left-right direction of the diaper 1 is demonstrated below.

=== Shrink force of diaper 1 in left and right direction ===
The contraction force of the diaper 1 in the left-right direction refers to the force of contracting the abdominal waist elastic member 23 and the back-side waist elastic member 33 in the left-right direction after being stretched. Specifically, it refers to the abdominal force after the stretch. The force by which the side waistline portion 20 and the back waistline portion 30 contract toward the inside in the left-right direction. The "shrink force" in the left-right direction is the "elongation force" in the left-right direction. Therefore, when the abdominal waist portion 20 and the back waist portion 30 are extended toward the outside in the left-right direction with a predetermined force, the abdominal waist portion 20 and the back waist portion 30 are contracted with a predetermined force toward the inside in the left-right direction. For example, the required elongation force for the diaper 1 to make the diaper 1 in the natural state stretched is equal to the contraction force for the diaper 1 to return the diaper 1 in the extended state to the natural state. Hereinafter, instead of "elongation force", it is also called "contraction force".

When the force for extending the unit length of the upper region U in the left-right direction of the diaper 1 is FU and the force for extending the unit length of the narrow region N in the left-right direction is FN, FN / WN <FU / WU. The state in which the upper region U and the narrow region N are extended by a unit length in the left-right direction includes not only the above-mentioned "stretched state" but also a state in which the upper region U and the narrow region N are extended in the left-right direction by a predetermined length. For example, the unit length can be set to 50 mm. FIG. 8A is a diagram illustrating a state where the upper region U is extended by a unit length. FIG. 8B is a diagram illustrating a state where the narrow region N is extended by a unit length. In addition, the force FU for extending the upper region U per unit length in the left-right direction and the force FN for extending the narrow region N per unit length in the left-right direction are not only included in the abdominal waistline 20, but also include the abdominal waistline 20 and the abdominal waistline 20, respectively. The force that the regions of the overlapping absorbent body 10 are stretched in the left-right direction.

The abdominal waist elastic member 23 fits the diaper 1 in the wearing state to the wearer's body, and the absorbent body 10 does not fall down due to absorption of excrement. Therefore, a certain contraction force is necessary. of. The upper region U is provided with a certain contraction force, thereby alleviating the fear of falling of the diaper 1.

On the other hand, since the narrow region N is shorter than the upper region U by setting the length of the absorbent core 11A in the left-right direction, the region V, which is the outer region in the left-right direction of the front narrow portion 11fn, does not exist. Since the absorptive core 11A, it is easy to receive the contraction force of the abdominal waist elastic member 23. In order to reduce the influence of the contraction force of the abdominal waist elastic member 23, the diaper 1 sets the contraction force in the narrow region N to be smaller than that in the upper region U. In this manner, in the wearing state, the traces of the contracted abdominal waist elastic member 23 remain on the skin of an infant or the wrinkles of the abdominal waist portion 20 formed by the contraction of the abdominal waist elastic member 23 can be reduced. Concerns about making the skin of infants and young children turn red. Thereby, in the wearing state of the diaper 1, while the feet of the infant are easy to move, the situation that the infant feels some pain or a sense of discomfort is reduced, and the wearing feeling of the diaper 1 can be improved.

The force for extending the unit length of the upper region U in the left-right direction is set to FU, and the force for extending the unit length of the narrow region N in the left-right direction is FN. The measurement is performed as follows.

First, the side portions 20a of the abdominal waistline portion 20 and the side portions 30a of the backside waistline portion 30 of the both sides of the pant-type diaper 1 are separated from each other. Then, the regions U and N shown in FIG. 8A and FIG. 8B are cut out, respectively. That is, a test piece of a region U having a length of W in the left-right direction and a length of WU in the up-down direction and a test piece of the region N having a length of W in the left-right direction and a length of WN in the up-down direction are prepared. Each of the test pieces was fixed at both ends in the left-right direction with a tensile tester (Instron Japan) at a tensile speed of 100 mm / min, and the tensile load was measured to measure each The test piece, that is, the respective elongation forces FU, FN of the regions U and N can be measured.

The elastic coefficient of each narrow telescopic member 23n is set smaller than the elastic coefficient of each upper telescopic member 23u, and may be FN / WN <FU / WU. In addition, the length, thickness, and number of telescopic members of each telescopic member may be changed.

The force for extending the unit length of the upper back region B in the left-right direction is FB, and the force for extending the unit length of the lower back region D in the left-right direction is FD / FD / WN <FB / WU. Furthermore, FN / WN <FD / WU is more ideal. FIG. 9A is a diagram illustrating a state where the upper back region B is extended by a unit length. FIG. 9B is a diagram illustrating a state where the lower back region D is extended by a unit length. In the pant-type diaper 1, the upper back region B and the upper region U form a loop, and the lower back region D and the narrow region N form a loop. Therefore, the back-side waist circumference telescopic member 33 provided in the back-side upper area B causes the upper area U to contract more strongly together with the back-side upper area B, thereby ensuring contraction of the waist circumference of the infant and reducing the diaper 1 Concerns falling down. On the other hand, the back waist elastic member 33 provided in the back lower area D shrinks the narrow area N together with the back lower area D. Therefore, the contraction force in the lower back region D is set to be smaller, so that in the wearing state, the traces of the contracted abdominal waist elastic member 23 may remain on the skin of the infant, or may be caused by the abdominal waist expansion and contraction. The wrinkles of the abdominal waistline 20 formed by the contraction of the member 23 abut the skin, and there is a concern that the skin of the infant becomes red.

As shown in FIG. 2, the lower-side abdominal waist telescoping member 23an, which is the lowermost side of the abdominal waist telescoping member 23, is the lowermost telescoping member and leg circumference, which is the narrow telescoping member 23n. It is desirable that the members 16 intersect. The lower abdominal waist telescoping member 23an and the leg telescoping member 16 are portions that extend and contract the leg opening LH. Therefore, the lower abdominal waist telescoping member 23an intersects the leg circumference telescoping member 16 to allow the leg circumference The opening portion LH is extended into a ring shape, and the leg opening portion can be fit to the leg of the infant.

As shown in FIG. 3, in the narrow region N, it is preferable that the absorptive body 10, the skin-side sheet 21, and the non-skin-side sheet portion 22 a are overlapped and folded back at the lower end portion 22 b in the front-rear direction. Thereby, the rigidity of the narrow region N can be improved more than the case where the folded-back lower end portion 22b is not provided, and the expansion and contraction of the narrow telescopic member 23n can be used as a buffer material. That is, the folded-back lower end portion 22b is provided to make the skin feel of the narrow region N softer. In addition, if the non-skin-side sheet 22 uses a soft sheet member as the folded-back lower end portion 22 b, it can alleviate the fear of hindering the movement of the legs of the infant, and can also reduce Butt becomes softer.

Furthermore, it is more desirable that all the narrow telescopic members 23n overlap the folded-back lower end portion 22b in the front-rear direction. Since the skin in the narrow region N can be made softer to the touch, the wearing feeling of infants can be improved.

The length WN in the up-down direction of the narrow region N is preferably longer than the length WU in the up-down direction of the upper region U (WN> WU). In this way, compared with the case where the length WN is shorter than the length WU, it is possible to alleviate kaka that is changed by the absorptive core 11A on the ventral side, or that the absorptive core is caused by the movement of the leg of the infant 11A concerns that the absorbent body 10 may be separated from the body of the infant.

=== Other Embodiments ===
Although the embodiments of the present invention have been described above, the embodiments described above are intended to facilitate the understanding of the present invention, and are not intended to limit the interpretation of the present invention. In addition, the present invention can be changed and improved as long as it does not depart from the gist thereof, and it goes without saying that the present invention also includes equivalents thereof. For example, there may be such a deformation as shown below.

In the above-mentioned embodiment, the non-skin-side sheet portion 22 a of the non-skin-side sheet 22 is folded back to soften the skin feel of the narrow region N, but it is not limited to this. In the front-rear direction, other members may be overlapped in the narrow region N. FIG. 10A is a schematic plan view of the diaper 100 viewed from the skin side in an expanded state and an extended state in another embodiment. Fig. 10B is a schematic cross-sectional view taken along a line X-X in Fig. 10. As shown in FIGS. 10A and 10B, a diaper 100 according to another embodiment is provided with a sheet member (other sheet portion) 150 between the abdominal waist portion 20 and the back waist portion 30 and the absorbent body 10. In the narrow region N, the sheet member 150 and the absorbent body 10, the skin-side sheet 21, and the non-skin-side sheet 22 overlap in the front-rear direction. The sheet member 150 serves as a cushioning material for the narrow telescopic member 23n, and since the skin feel in the narrow region N can be made softer, the wearing feeling of the diaper 100 can be improved.

Moreover, in the said embodiment, although the shape of the non-stretchable area Ff of the abdominal waistline part 20 was made into rectangle, it is not limited to this. That is, although the length in the left-right direction of the non-stretchable region Ff in the upper region U and the length in the left-right direction of the non-stretchable region Ff in the narrow region N are set to be the same length, it is not limited thereto. The length in the left-right direction of the non-stretchable region Ff in the upper region U and the length in the left-right direction of the non-stretchable region Ff in the narrow region N can be arbitrarily set. For example, the length in the left-right direction of the non-stretchable region Ff in the narrow region N may be set longer than the length in the left-right direction of the non-stretchable region Ff in the upper region U. In this way, compared with the case where the length in the left-right direction of the non-stretchable region Ff in the narrow region N is set shorter than the length in the left-right direction of the non-stretchable region Ff in the upper region U, the movement in the narrow region N can be reduced. Stretching force, which can make infants feel better wearing.

In addition, the lower end of the fixing portion 55 of the leak-proof wall portion 50, that is, the lower end of the end joint portion 52 may be located on the upper side than the lower end of the upper region U. In this way, compared with the case where the lower end of the fixing portion 55 of the leak-proof wall portion 50 is located lower than the lower end of the upper region U, the length of the rising portion 56 of the leak-proof wall portion 50 in the vertical direction can be set to Wider. Therefore, the concern that the excrement may leak to the outside in the left-right direction can be reduced.

In the embodiment described above, the silk rubber and the stretch sheet are exemplified as the stretch members (22, 32, 51, 16) included in the abdominal waist section 20, the back waist section 30, the leak-proof wall section 50, and the leg circumference section 60. ), But it is not limited to this. For example, not only a silk rubber or a stretchable sheet, but also a sheet-like stretchable member such as a stretchable film may be arranged singularly or plurally. In addition, the drawing shows only portions (so-called effective length portions) where elasticity occurs in the telescopic member. Therefore, there may be a part of the telescopic member that cannot be stretched on the outer side in the longitudinal direction of the telescopic member shown. The arrangement and number of telescopic members are not limited to those shown in the drawings.

In the present embodiment, in the above-mentioned embodiment, the shorts-type absorbent article is described with respect to a so-called 3-component disposable disposable diaper having the abdominal waist portion 20, the back waist portion 30, and the absorbent body 10. , But it is not limited to this. For example, a diaper (so-called two-member type) in which the outer cover sheet 14 connects the abdominal waistline portion 20 and the rear waistline 30 and is integrated may be used.

1, 100‧‧‧ diapers (short type disposable diapers, short type absorbent articles)

10‧‧‧ Absorptive body

11‧‧‧ Absorber

11A‧‧‧ Absorbent core

11B‧‧‧Core cladding sheet

11Af‧‧‧Front core

11Ab‧‧‧ Rear side core

11fu‧‧‧upper

11fn‧‧‧Anterior narrow section (narrow section)

11bu‧‧‧upper

11bn‧‧‧ posterior stenosis (stenosis)

11n‧‧‧Narrowest part

12‧‧‧ top sheet

13‧‧‧ back sheet

14‧‧‧ Exterior sheet

15‧‧‧Leak-proof wall member

16‧‧‧ Leg circumference telescopic member

20‧‧‧ Ventral waistline

20a‧‧‧side

21‧‧‧Skin-side sheet (skin-side sheet)

22‧‧‧ Non-Skin Side Sheet

22a‧‧‧ Non-skin side thin section

22u‧‧‧turn back to the top

22b‧‧‧ Turned back to the lower end (other thin section)

23‧‧‧ Ventral waist circumference telescopic member

23a‧‧‧silk rubber

23b‧‧‧ Retractable sheet

23an‧‧‧Lower ventral waist circumference telescopic member

23u‧‧‧ Upper telescopic member

23n‧‧‧Narrow telescopic member

30‧‧‧Back waist

30a‧‧‧side

31‧‧‧Skin Side Sheet

32‧‧‧ Non-Skin Side Sheet

32‧‧‧ Turn back to the top

33‧‧‧Backside waist circumference telescopic member

50‧‧‧Leak-proof wall

51‧‧‧Leakproof wall telescopic member

52‧‧‧ terminal joint

53‧‧‧side joint

55‧‧‧Fixed section

56‧‧‧ Stand

60‧‧‧ Leg frills

150‧‧‧ sheet member (other sheet parts)

LH‧‧‧ Leg circumference opening

BH‧‧‧ Waist opening

Df‧‧‧ telescopic area

Db‧‧‧ non-retractable area

Ff‧‧‧ telescopic area

Db‧‧‧ non-retractable area

E‧‧‧Pressing Department

U‧‧‧upper area

N‧‧‧Narrow area

B‧‧‧ dorsal upper area

D‧‧‧ dorsal area

S‧‧‧Slit

V‧‧‧ area

C10‧‧‧Central

FIG. 1 is a schematic perspective view of a shorts-type disposable diaper 1. FIG. 1B is a diagram showing an example of a wearing state of the diaper 1.

FIG. 2 is a schematic plan view of the diaper 1 in an expanded state and an extended state as viewed from the skin side.

Fig. 3 is a schematic cross-sectional view taken along a line A-A in Fig. 2.

Fig. 4 is a schematic cross-sectional view taken along the arrow B-B in Fig. 2.

FIG. 5 is a diagram illustrating the stretched areas Df and Db and the non-stretched areas Ff and Fb.

FIG. 6 is a schematic diagram illustrating a configuration of a schematic plan view of FIG. 2.

FIG. 7 is a diagram illustrating the absorber 11.

FIG. 8 and FIG. 8A are diagrams illustrating a state where the upper region U is extended by a unit length. FIG. 8B is a diagram illustrating a state where the narrow region N is extended by a unit length.

FIG. 9 and FIG. 9A are diagrams illustrating a state in which the upper back region B is extended by a unit length. FIG. 9B is a diagram illustrating a state where the lower back region D is extended by a unit length.

FIG. 10 is a schematic plan view of the diaper 100 in an unfolded state and an extended state of another embodiment as viewed from the side surface of the skin. Fig. 10B is a schematic cross-sectional view taken along a line X-X in Fig. 10.

Claims (11)

A shorts-type absorbent article having an up-down direction, a left-right direction, and a front-back direction. It also has an absorbent core, an abdominal waistline, and a back waistline. The shorts-type absorbent article is characterized by: The ventral waistline portion and the backside waistline portion are each provided with a ventral waistline telescopic member and a dorsal waistline telescopic member that expand and contract in the left-right direction, The absorptive core is folded in half and has a front core portion located on the front side and a rear core portion located on the rear side. The front core portion is a narrow portion having a shorter length in the left-right direction than an upper portion on the upper side than the lower end of the abdominal waist portion, The upper and lower directions include an upper region where the abdominal waist section overlaps the upper part of the front core part, and a narrow region where the abdominal waist section overlaps the narrow part of the front core part, In the vertical direction, the length of the upper region is WU, and the length of the narrow region is WN. When the force for elongating the unit length in the upper region is FU and the force for elongating the unit length in the narrow region is FN in the left-right direction, FN / WN <FU / WU. The shorts-type absorbent article according to item 1 of the patent application scope, wherein: In the abdominal waist elastic member, the elastic coefficient of the narrow telescopic member disposed in the narrow region is smaller than the elastic coefficient of the upper telescopic member disposed in the upper region. The shorts-type absorbent article according to item 1 or item 2 of the patent application scope, wherein: In the back side waistline region, a region overlapping the upper region in the front-rear direction is a back upper region, In the back waist region, a region overlapping the narrow region in the front-back direction is a back lower region, In the left-right direction, when the force for elongating the unit length of the upper back region is FB and the force for elongating the unit length of the lower back region is FD, FD / WN <FB / WU. The shorts-type absorbent article according to any one of claims 1 to 3 in the scope of patent application, wherein: In the back side waistline region, a region overlapping the upper region in the front-rear direction is a back upper region, In the back waist region, a region overlapping the narrow region in the front-back direction is a back lower region, When the force for elongating the unit length of the lower back region in the left-right direction is FD, FN / WN <FD / WN. The shorts-type absorbent article according to item 1 or item 2 of the patent application scope, wherein: In the back side waistline region, a region overlapping the upper region in the front-rear direction is a back upper region, In the back waist region, a region overlapping the narrow region in the front-back direction is a back lower region, In the left-right direction, when the force for elongating the unit length of the upper back region is FB and the force for elongating the unit length of the lower back region is FD, FD / WN ＜ FB / WU, FN / WN <FD / WN. The shorts-type absorbent article according to any one of claims 1 to 5, in which: Has a pair of leg openings, The leg circumference opening portion has a leg circumference telescopic area that expands and contracts in the vertical direction, Of the aforementioned abdominal waist telescoping members, the lower abdominal waist telescoping member which is located on the lowermost side intersects at least a portion of the leg circumference telescopic area. The shorts-type absorbent article according to any one of claims 1 to 6, in which: Having an absorptive body having the aforementioned absorptive core, The abdominal waist portion includes a skin-side thin portion and a non-skin-side thin portion, The narrow region is in the front-rear direction, and the absorbent body, the skin-side sheet portion, the non-skin-side sheet portion, and other sheet portions overlap. The shorts-type absorbent article according to item 7 of the patent application scope, wherein All of the ventral waist circumference telescopic members arranged in the narrow region overlap the other sheet portions in the front-rear direction. The shorts-type absorbent article according to any one of claims 1 to 8 of the scope of patent application, wherein: The length of the narrow region in the vertical direction is longer than the length of the upper region in the vertical direction. The shorts-type absorbent article according to any one of claims 1 to 9 of the scope of patent application, wherein: Having a pair of leak-proof walls, the pair of leak-proof walls being provided with: a leak-proof wall elastic member, a fixing portion that cannot rise to the skin side, and a rising portion that can rise to the skin side, The lower end of the fixing portion is positioned above the lower end of the upper region. The shorts-type absorbent article according to any one of claims 1 to 10 in the scope of patent application, wherein: The abdominal waistline portion includes a telescopic area that expands and contracts together with the abdominal waistline telescopic member, and a non-stretchable area that does not expand and contract. The length in the left-right direction of the non-stretchable region in the narrow region is longer than the length in the left-right direction of the absorbent core in the upper portion.