JP2008043674A - Pants-type diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants-type diaper having an excellent wearing comfort. <P>SOLUTION: The pants-type diaper 1 has a sheet member 15 having a crotch part 14 located between a front waist surrounding part 12 and a rear waist surrounding part 13 and an absorbent structure extending between the front and rear waist surrounding parts 12 and 13. The sheet member 15 has a buttock abutting part 2 in the rear waist surrounding part 13 that abuts the buttock of the wearer. The buttock abutting part 2 contains a nonwoven fabric that extends and contracts in the width direction of the diaper 1. When measured by KES method, bending stiffness and bending recovery of the buttock abutting part 2 in the width direction is ≤9.8×10<SP>-4</SP>N*cm<SP>2</SP>/cm and ≤9.8×10<SP>-4</SP>N*cm<SP>2</SP>/cm, respectively, and elongation ratio of the buttock abutting part 2 in the width direction is ≥50%. In addition, bending stiffness of a composite body comprising the absorbent structure and the sheet member is ≤2.55×10<SP>-2</SP>N*cm<SP>2</SP>/cm in the width direction and ≤1.77×10<SP>-2</SP>N*cm<SP>2</SP>/cm in the longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pant-type diaper, and more particularly, to a pant-type diaper excellent in wearing comfort.

Conventionally, many inventions that improve the comfort of a pants-type diaper (hereinafter referred to as a diaper) have been disclosed.
For example, in Patent Document 1, in a diaper, at least two sheets are provided in a side flap region where no absorber exists, and a plurality of elastic members are arranged at an average interval of 5 mm or less between the sheets. At least one bulk softness is set to 0.1 N / 30 mm or less in the width direction of the product, the bending rigidity of the absorber is 350 mN / 50 mm or less, the load for extending the entire circumference of the trunk by 80% is set to 2 to 8 N, and side flaps are set. A diaper in which B / A ≦ 0.4N is disclosed, where A is the number of elastic members disposed in the region and BN is a load for extending the entire circumference of the trunk.
JP-A-2004-81365 (Claim 1, paragraphs 0008 to 0010)

In the diaper of Patent Document 1, by using a soft absorber and a plurality of elastic members, the plurality of elastic members on the side of the absorber attracts the absorber to the center, and a pocket structure is formed on the side to ooze out. Preventive effect is obtained. However, when the wearer moves, the upper end of the pocket structure and the skin surface repeat contact and non-contact, causing the wearer to feel uncomfortable.
Moreover, in the diaper of patent document 1, since the hydrophobic adhesive provided in the one nonwoven fabric side is locally densified by the gathers by an elastic member, excretion of excrement is prevented. However, when the adhesive is densified, the side flaps become hard, and there is also a problem that the comfort of wearing is impaired without adapting to the body.

  As seen in this example, the comfort of conventional diapers is not always satisfactory and there is room for improvement. Then, an object of this invention is to provide the diaper excellent in the comfort.

  The present invention for solving the above-mentioned problems has a front waistline region, a back waistline region, and a crotch region located between both, and both side edges in the vicinity of the crotch region are recessed inward. The front waist region and the back waist region are joined to each other at opposite edges to form a waist opening and a pair of leg openings. Is formed, and the absorbent structure extends between the front waistline region and the back waistline region, and is assumed to be a diaper joined to the seat member so as to face the wearer.

The feature of the present invention based on this premise is that the sheet member has a buttocks abutment portion that abuts against the wearer's buttocks at least in the rear waist area, and the buttocks abutment portion is made of a fiber nonwoven fabric that expands and contracts in the width direction of the diaper. The bending stiffness by the KES method in the width direction of the buttocks contact portion is 9.8 × 10 ⁻⁴ N · cm ² / cm or less, and the bending recovery property is 9.8 × 10 ⁻⁴ N · cm ^2. / Cm or less, the elongation by the KES method in the width direction of the buttocks contact portion is 50% or more, and the flexural rigidity of the composite of the absorbent structure and the sheet member by the KES method is 2. It is 55 × 10 ⁻² N · cm ² / cm or less, and 1.77 × 10 ⁻² N · cm ² / cm or less in the front-rear direction orthogonal to the width direction.

  In another embodiment of the present invention, the buttocks contact portion of the sheet member includes a stretchable fiber nonwoven fabric, a laminate of the stretchable fiber nonwoven fabric and the substantially non-stretchable fiber nonwoven fabric, and the stretch It can be comprised in either of the group which consists of the laminated body of the fiber nonwoven fabric which has property, and the fiber nonwoven fabric which has a stretching property. Here, the non-stretchable fiber non-woven fabric means that the stretch rate is very small (several percent) with the force applied when wearing a diaper, and it is stretchable compared to elastic materials such as rubber strings. It refers to a poor nonwoven fabric.

  Further, in another embodiment of the present invention, the flange contact portion may further include an elastic member that includes a width direction component.

In still another embodiment of the present invention, the absorbent body may have at least one of a groove extending in the vertical direction perpendicular to the width direction and an opening extending in the vertical direction.
The reason why the diaper of the present application is configured in this way is based on the following knowledge.

In order to improve the comfort of a diaper, the inventors of the present application conducted a wearing test of a pants-type diaper assuming a wearer who has a high daily activity and is fine but has mild incontinence. The subjects were 20 women aged 50 to 70 years old, and three types of commercially available diapers (M size) were used as samples to perform subjective evaluation.
Subjective evaluation uses “diaper comfort” as an objective variable, and the terms for expressing the texture are “feel good to touch”, “fits into the body”, “easy to move”, “absorber (absorbent structure) is not stiff” We conducted multiple regression analysis using subjective items such as “I don't feel tight around my stomach and waist”, “Wrap my stomach and waist completely”, “I wrap my hips”, and “I don't feel tight around my legs” as explanatory variables.

  Evaluation of each subjective item when the subject actually wears a diaper and performs three movements of “after wearing”, “when walking”, and “moving up after crouching” assuming daily movements I was asked. The evaluation of each subjective item was scored as an 11-point evaluation between “very good”, “same”, and “very bad” compared to the case where the evaluation was zero, with one commercially available product as the standard. It was.

  As a result of the multiple regression analysis, the explanatory variables that greatly affect the objective variable “comfortable to wear” are “familiar with the body”, “absorbent structure is not stiff”, “feels good”, “after the absorbent structure” It was found that “the front is not bumped” and “the front of the absorbent structure is not bumped”. Furthermore, the diaper parts that affect the objective variable “comfortable comfort” are “the rear side of the absorbent structure”, “the absorbent structure located at the buttocks contact portion”, “the sheet constituting the diaper” It was found that this is the “butt contact portion of the member”. Here, the buttocks contact portion of the sheet member refers to a portion that contacts at least the most prominent vicinity of the buttocks when the wearer raises the diaper to a normal position. However, it is not necessary to cover the entire butt.

  Based on this result, for each of the diapers used for evaluation, the mechanical properties of the sheet member-butting portion influencing the comfort and the composite of the sheet member and the absorbent structure are evaluated by a texture measurement method. Measured by a certain KES method, the mechanical properties that should be provided in comfortable diapers were examined. For the measurement, samples of a predetermined shape were collected from each part of each diaper, and tensile properties, shear properties, bending properties, compression properties, and surface properties were measured.

As a result of the measurement, items highly correlated with the comfort of diapers are the elongation rate, bending rigidity, bending recovery (hysteresis) of the buttocks contact portion of the sheet member, and the width of the composite of the sheet member and the absorbent structure. It turned out to be the bending stiffness in the direction and the front-rear direction.
More specifically, the higher the stretch rate in the width direction of the diaper at the buttocks contact portion of the sheet member, the more comfortable it is because it “fits the body”, “moves easily”, and the absorber (absorbent structure) is not stiff. The result was good. A high elongation rate of the buttocks contact portion means that the range that can flexibly cope with the force applied to the sheet member by various body movements is wide. Further, from the measurement data of each diaper, in order to obtain a comfortable diaper, it was found that the elongation percentage of the buttocks contact portion of the sheet member measured by the KES method should be at least 50%.

Further, the lower the bending rigidity of the buttocks contact portion of the sheet member and the higher the bending recovery, the better the feeling of being “familiar with the body”. The bending rigidity of the buttocks contact portion is low and the bend recovery property is high. The force repelling the force applied to the buttocks contact portion of the sheet member due to various body movements is weak, and the buttocks contact of the sheet member It means that it is easy to follow the direction of the force applied to the part. Moreover, in order to obtain a comfortable diaper from the measurement data of each diaper, the bending rigidity of the buttocks contact portion of the sheet member measured by the KES method is 9.8 × 10 ⁻⁴ N · cm ² / cm or less. It was found that the bending recovery should be 9.8 × 10 ⁻⁴ N · cm ² / cm or less. High bending recovery means that the hysteresis is small when the bending stiffness is measured by the KES method.

Furthermore, the lower the flexural rigidity of the composite structure of the absorbent structure and the seat member located between the wearer's crotch, the more “familiar with the body” and “the absorbent body (absorbent structure) is not stiff” The result was comfortable. The low bending rigidity means that the force repelling the force applied to the composite structure of the absorbent structure and the sheet member due to various body movements is weak, that is, the force is applied, like the buttocks contact portion. It means that it is easy to follow the direction. Moreover, in order to obtain a comfortable diaper from the measurement data of each diaper, the flexural rigidity by the KES method of the composite of the absorbent structure and the sheet member is 2.55 × 10 ⁻² N · in the width direction. cm ² / cm or less, it has been found that should be less ^{1.77 × 10 -2 N · cm 2} / cm in the longitudinal direction. In addition, the detail of the measuring method by KES method of each item is mentioned later.

  According to the diaper according to the present invention, a diaper abutting portion of the diaper having a high correlation with “comfortable comfort”, and a diaper in which the composite of the absorbent structure and the sheet member has appropriate mechanical properties As a result, a diaper having excellent comfort is provided.

Hereinafter, a pants-type diaper according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the diaper 1, and FIG. 2 is a developed plan view that separates the front waistline region 12 and the back waistline region 13 of the diaper 1 from each other.
1 and 2, the diaper 1 has a front and rear waist area 12 and 13 joined to each other at opposite edges 51 and 51 to form a pants shape, and a waist opening 10 and a pair of leg openings 11. And a front waistline region 12, a back waistline region 13, and a crotch region 14. The diaper basically includes a sheet member 15 and an absorbent structure 16 (not shown in FIG. 1) having the absorber 40.

  As shown in FIG. 2, the absorbent structure 16 having the absorbent body 40 is orthogonal to the width direction X of the diaper 1 between the front and rear waist regions 12 and 13 inside the sheet member 15 (inside the diaper 1). It extends in the longitudinal direction Y and is provided to face the wearer. However, the absorbent structure 16 is slightly biased toward the front waistline region 12 of the sheet member 15 in the positional relationship with the sheet member 15. Further, the sheet member 15 has the buttocks contact portion 2 located on both sides of the absorber 40 in the rear waistline region 13.

Next, the structure of the sheet member 15 will be described with reference to FIG. 3 which is an exploded perspective view of the diaper 1.
The sheet member 15 includes a base sheet 19 that is not stretchable in the width direction X, a first exterior sheet 20 and a second exterior sheet 21 that are stretchable in the width direction X, and a third exterior that is not stretchable in the width direction X. The sheet 22 is included as a main component. The base sheet 19 has a front waistline region 120, a back waistline region 130, and a crotch region 140, which are the same as the front waistline region 12, the back waistline region 13, and the crotch region 14. It is the same size. The non-stretchable base sheet 19 is laminated with a stretchable first exterior sheet 20 and second exterior sheet 21.

  The front waistline region 120 has a rectangular shape that is long in the width direction X when a continuous portion with the crotch region 140 is ignored. The rear waist region 130 has a substantially hexagonal shape when a continuous portion with the crotch region 140 is ignored. Specifically, the substantially hexagonal shape has an upper end edge 52 that extends linearly in the width direction X, both side edges 23 that extend linearly in the vertical direction Y and in parallel with each other, and a lower end point P of these side edges 23. The lower edges 24 extend in a diagonally straight line so that the distance between them approaches toward the area 140. The area of the rear waistline region 130 having such a shape is larger than the front waistline region 120 by the region between the opposed sides of the lower side edges 24, and sufficiently covers the wearer's buttocks.

  The portion that sufficiently covers the wearer's buttocks corresponds to the buttocks contact portion 2. The diaper 1 of the present embodiment is surrounded by a virtual line L connecting the lower end points P, P of both side edges 23 and both lower edges 24, and from the virtual line L to a position 10 cm away from the front waistline region 120. The flange contact portion 2 is used. The buttocks contact portion 2 is formed of a laminate of the base sheet 19 and the second exterior sheet 21.

  Here, the buttocks abutment portion 2 is a portion that abuts so as to cover at least the most prominent vicinity of the buttocks when the wearer raises the diaper product to a normal position. Since a specific position changes with the shape of the diaper product, and a wearer's physique, it is judged from the state at the time of wearing.

  The crotch region 140 has both side edges 25 slightly bent inward. The front and rear end portions 26 and 27 of the base sheet 19 are folded, and a plurality of elastic members 31 capable of contracting in the width direction X are attached thereto to form waistband regions 29 and 30 located around the wearer's torso. is doing.

  The first exterior sheet 20 and the second exterior sheet 21 have substantially the same shape as the front waistline area 120 and the back waistline area 130 of the base sheet 19. However, the dimension in the longitudinal direction Y of the first exterior sheet 20 and the second exterior sheet 21 is smaller than the front and rear waist areas 120 and 130. The first exterior sheet 20 has an inner edge 32 that coincides with the inner edge 34 of the front waistline area 120, and the second exterior sheet 21 has an inner edge 33 below the rear waistline area 130. They are overlaid so as to coincide with the side edges 24.

  Thereby, a space | interval arises between the front-end edge 35 of the 1st exterior sheet 20, the rear-end edge 36 of the 2nd exterior sheet 21, and the waistband area | regions 29 and 30 of the base sheet 19, respectively. A gather is formed by the contraction of the member 31. Note that the first and second exterior sheets 20 and 21 themselves do not form gathers because the entire sheet has elasticity.

  The third exterior sheet 22 connects the first and second exterior sheets 20 and 21 via a hot melt adhesive and is located on the outer surface of the crotch region 140 of the base sheet 19. The third exterior sheet 22 and the first and second exterior sheets 20 and 21 form an exterior sheet 37. In an area between the outer sheet 37 and the base sheet 19 and where the absorbent structure 16 is located, a liquid-impermeable barrier sheet 38 is provided to prevent leakage of excrement from the bottom surface of the absorbent structure 16. Intervenes. However, the barrier sheet 38 may be positioned between the absorbent structure 16 and the base sheet 19.

  The first and second exterior sheets 20 and 21 are hot melt adhesives (not shown) on the outer surfaces of the front and rear waist regions 120 and 130 and the barrier sheet 38 of the base sheet 19 under a predetermined expansion ratio in the width direction X. ). Therefore, after the lamination, when the first and second exterior sheets 20 and 21 contract in the width direction X, a gather is formed on the non-stretchable base sheet 19.

  The absorbent structure 16 is joined to the base sheet 19. The absorbent structure 16 includes a known absorbent body 40 mainly composed of fluff pulp and mixed with superabsorbent polymer particles, and a liquid-permeable wrap sheet covering the bottom surface to the top surface of the absorbent body 40. 41 and a liquid-permeable top sheet 42 joined to the upper surface of the center via a hot melt adhesive or the like. The absorber 40 has an opening 45a extending in the longitudinal direction Y at the center thereof and an opening 45b extending in parallel with both sides thereof.

  The openings 45a and 45b reduce the rigidity of the absorbent body 40 in the width direction X, naturally bend / bend to fit the crotch according to the shape and width of the crotch of the wearer, and absorb and diffuse excrement. Thus, the absorption performance can be improved and so-called side leakage of excrement can be prevented. In addition, a groove extending in the vertical direction Y can be formed instead of the openings 45a and 45b, and the rigidity in the width direction X of the absorber 40 can be reduced.

  A pair of elastic barrier flaps 46 that contract in the longitudinal direction Y are joined to both sides of the absorbent structure 16. The barrier flap 46 includes a fibrous sheet 49 that extends outward from the side edge of the absorbent structure 16 and an elastic member 47 that covers the side edge of the fibrous sheet 49 by folding. It is possible to get up with respect to the absorbent structure 16. In addition, elastic barrier sheet pieces 50 that contract in the longitudinal direction Y are joined to both sides of the crotch region 140 of the base sheet 19. The barrier sheet piece 50 is pressed against the wearer's crotch root to prevent excrement from leaking.

  The first exterior sheet 20 and the second exterior sheet 21 having stretchability include a long fiber made of a thermoplastic elastomer such as urethane, olefin, or styrene, and a long fiber of a thermoplastic resin such as polyolefin or polyester. It is possible to use a mixed fiber spunbonded nonwoven fabric in which stretchability is developed by drawing a mixed fiber web containing the above at a draw ratio exceeding 60%. If the draw ratio is 60% or less, it is difficult to increase the elongation percentage of the buttocks contact portion 2 to 50% or more.

The basis weight of the mixed fiber spunbonded nonwoven fabric is preferably ²⁰ to 50 g / m ² , and more preferably 30 to 40 g / m ² . When the urethane-based thermoplastic elastomer fiber and the polypropylene fiber are combined, the mass ratio is 65/35 to 25/75, preferably 55/45 to 35/65. When the amount of the urethane-based thermoplastic elastomer is too large, the tactile sensation is deteriorated, and when the amount of polypropylene exceeds 75% by mass, the distortion of the stretchable nonwoven fabric increases.

The base sheet 19 and the third exterior sheet 22 are non-stretchable thermoplastic synthetic fiber nonwoven fabrics, preferably polyolefin-based spunbond nonwoven fabrics, and have a basis weight of 10 to 35 g / m ² , more preferably 15 to 25 g / m ^2. Can be used.

  When the first and second exterior sheets 20, 21 are laminated on the third exterior sheet 22, the expansion ratio is preferably 50 to 150%, and if it is less than 50%, it follows the movement of the wearer's body. The rate of growth required to do so is insufficient. If it exceeds 150%, a considerable force is required to widen the waist opening 10.

When the first and second exterior sheets 20 and 21 and the base sheet 19 are laminated with a hot melt adhesive, the hot melt adhesive is intermittently or continuously striped, spiral, zigzag in the width direction X and the longitudinal direction Y. It can be applied in a pattern such as or dots. If it is applied in an intermittent pattern, an increase in the rigidity of the sheet member 15 can be minimized as compared with a case where the hot melt adhesive is solid-coated or a case where it is continuously applied. Moreover, it is preferable that the application quantity of a hot-melt-adhesive shall be 1-5 g / m < ² >. If the coating amount exceeds 5 g / m ² , the rigidity of the sheet member 15 becomes too high.
Thus, by laminating the non-stretchable nonwoven fabric on the stretchable nonwoven fabric, the required strength of the sheet member 15 can be easily maintained.

Next, the mechanical properties of the buttocks contact portion 2 of the sheet member 15 of the diaper 1 and the composite of the absorbent structure 16 and the sheet member 15 were measured by the KES method. A detailed explanation of the KES method can be found in “Standardization and Analysis of Texture Evaluation (2nd Edition)” written by Kyuo Kawabata, Japan Textile Machinery Society, Texture Measurement and Standardization Research Committee (July 10, 1980) Although described here, the present invention will be described within the scope relevant to the present invention.

<Bending rigidity and bend recovery of the buttocks contact portion 2 of the sheet member 15>
For the measurement sample of the buttocks contact portion 2, the sheet member 15 corresponding to the buttocks contact portion 2 of the diaper 1 was used. The non-stretchable nonwoven fabric constituting the measurement sample is a spunbonded nonwoven fabric having a basis weight of 19 g / m ² made of polypropylene fiber. The stretchable nonwoven fabric is obtained by stretching a polypro-urethane rubber mixed fiber web having an unstretched basis weight of 35 g / m ² in one direction at a stretch ratio of 2.5 times. The sample of the buttocks contact portion 2 is obtained by extending a stretchable nonwoven fabric 1.8 times in the stretching direction and laminating the non-stretchable nonwoven fabric with a hot melt adhesive. The application amount of the hot melt adhesive is 3.5 g / m ² , which is an application pattern applied intermittently in the width direction X and the vertical direction Y.

Bending measurement was performed using a Kate-Tech KES-FB2 measuring device, a sample with a length of 10 cm and a width of 5 cm was set at a grip interval of 1 cm, bent to the front side to a maximum curvature of 2.5 cm ⁻¹ , and then −2.5 cm. It was performed by bending back to ^{-1, and} then returning to the original position.
As shown in FIG. 4, the bending stiffness was obtained from the inclination B when the inclination of the bending moment with respect to the curvature became almost constant when the sample was bent to the front side, and the bending recovery was obtained from the hysteresis width 2HB in FIG.

<Elongation rate of the buttocks contact portion 2 of the sheet member 15>
Using a Kato Tech KES-FB1 as a measuring device, a sample with a length of 10 cm and a width of 10 cm was pulled to a maximum load of 98 N at a gripping interval of 2.5 cm and a pulling speed of 0.1 cm / sec ⁻¹ , and elongation in a cycle to return to the original state. The rate was measured.
The measurement results are shown in FIG. In the case of a material in which a stretchable nonwoven fabric is laminated on a non-stretchable nonwoven fabric under elongation like the base sheet 19 and the second exterior sheet 21 constituting the collar contact portion 2, the stretchable nonwoven fabric is stretched to stretch the non-stretchable nonwoven fabric. When it becomes almost equal to the length of, the load increases rapidly, and a so-called non-elongation state is obtained. When such an extension stop occurs, to obtain a comfortable diaper product, it is necessary that the elongation ratio of the buttocks contact portion 2 until the extension stop is 50% or more.

<Bending rigidity of composite of absorbent structure 16 and sheet member 15>
Samples for measuring the bending stiffness include an absorbent structure 16, a base sheet 19, a first exterior sheet 20, a second exterior sheet 21, a third exterior sheet 22, and a barrier sheet cut from the crotch region 14 of the diaper 1. A composite comprising the sheet member 15 containing 38 or the like was used.
Absorber 40 of the absorbent structure 16, a fluff pulp having a basis weight of 200 g / ^{m 2,} composed of absorbent polymer having a basis weight of 180 g / ^{m 2,} a single-layer structure which is blended almost uniformly. Further, the outer dimension is about 40 cm in the vertical direction (front-rear direction), the width-direction dimension at the buttocks contact portion 2 is about 12 cm, and the thickness is about 3 mm, and the shape has an opening 45a with a width of about 1 cm and a length of 30 cm in the central vertical direction. It is. The opening 45b of the absorber 40 has a width of about 0.5 cm and a length of about 7 cm. The wrap sheet 41 wrapping the absorbent body 40 is made of a polyolefin-based point bond nonwoven fabric having a basis weight of 15 to 25 g / m ² subjected to a hydrophilic treatment. The top sheet 42 is made of a polyolefin-based air-through nonwoven fabric having a weight per unit area of 25 g / m ² and having hydrophilicity and liquid permeability.

The sample for measuring the bending stiffness includes a longitudinal center line that bisects the width of the opening 45a and a longitudinal length of the opening 45b, where the extending direction of the opening 45a of the absorbent body 40 included in the absorbent structure 16 is the longitudinal direction. A sample having a length of 10 cm and a width of 10 cm was produced around the point where the horizontal center lines that bisect the height intersect. Next, using Kato-Tech KES-FB2-L, the extending direction of the opening 45a is parallel to the line connecting the two clamps, and the vertical center position of the opening 45b is located at the center between the clamps. Then, the bending rigidity in the front-rear direction of the composite body of the absorbent structure 16 and the sheet member 15 was measured.
Further, the extending direction of the opening 45a and the line connecting the two clamps are orthogonal to each other, and the opening 45a is positioned at the center between the clamps, so that the width of the composite of the absorbent structure 16 and the sheet member 15 is increased. The bending stiffness was measured.
The above measurement results are shown in Table 1.

  As shown in Table 1, the diaper 1 of the present invention has mechanical properties necessary to improve the comfort. When the wearing test of this diaper 1 was conducted, it was confirmed that the evaluation of the subjective items exceeded all commercially available items, and the wearing comfort was good.

As mentioned above, although demonstrated based on embodiment, this invention is not limited to this, A various change can be implemented.
For example, instead of using a stretched nonwoven fabric and a non-stretchable nonwoven fabric as the buttocks contact portion 2 of the sheet member 15, a laminate of two stretchable nonwoven fabrics or a stretchable nonwoven fabric alone may be used. Alternatively, an elastic member such as a rubber string or a plastic film having elasticity can be provided between the stretchable nonwoven fabric and the stretchable or non-stretchable nonwoven fabric. In this case, the stress in the width direction of the diaper 1 can be increased by providing the elastic member at an extension ratio lower than that of the stretchable nonwoven fabric.

When the collar contact portion 2 of the sheet member 15 is a stretchable nonwoven fabric alone, the stretch rate can be increased.
On the other hand, when the wearer wears the diaper 1, the front and rear waist areas 12 and 13 are lifted and worn above the wearer. At this time, the sheet member 15 including the front and rear waist regions 12, 13 may be broken unless the strength of the sheet member 15 is increased. Therefore, by using the sheet member 15 in which the non-stretchable non-woven fabric is bonded to the stretchable non-woven fabric, the force that the wearer pulls upward, that is, the tensile strength in the longitudinal direction of the diaper 1 is increased compared to the case of the stretchable non-woven fabric alone. It becomes possible.

In addition, when two stretchable nonwoven fabrics are combined, the sheet member 15 is configured to be stretchable in the vertical direction while maintaining an elongation rate in the width direction of 50% or more, and to have appropriate stretch characteristics in the vertical and horizontal directions. You can also.
In addition, the non-stretchable nonwoven fabric and the non-stretchable non-woven fabric can be bonded to each other not only by a hot melt adhesive but also by heat sealing or ultrasonic bonding. Bonding with a hot melt adhesive is preferable because the nonwoven fabric fibers are not thermally melted and the stretchability of the nonwoven fabric is not easily inhibited.

The perspective view of the underpants type diaper concerning an embodiment. The expansion | deployment top view which isolate | separated the front and rear waist area of the pants-type diaper from each other. The exploded perspective view of a underpants type diaper. The figure for demonstrating the measuring method of a bending characteristic. The figure which shows the elongation rate measurement result of a collar part contact part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants-type diaper 2 Abutment part contact part 10 Trunk opening 11 Leg opening 12 Front waist area 13 Rear waist area 14 Crotch area 15 Sheet member 16 Absorbent structure 25 Both side edges 40 Absorber 45a Opening 45b Opening 51 Opposite Side edge X width direction

Claims (4)

A front waistline region, a back waistline region, and a crotch region located between the two, and both side edges near the crotch region are shaped inwardly, and sheet members,
An absorbent structure having an absorbent that absorbs bodily fluids,
The front waistline region and the back waistline region are joined to each other at opposite edges to form a waistline opening and a pair of leg opening.
In the pants-type diaper in which the absorbent structure extends between the front waistline region and the back waistline region and is bonded to the sheet member so as to face the wearer,
The sheet member has at least a buttocks abutting portion that abuts a wearer's buttocks in a region around the back waist,
The buttocks contact portion is configured to include a fiber nonwoven fabric that expands and contracts in the width direction of the diaper,
Bending rigidity by the KES method in the width direction of the buttocks contact portion is 9.8 × 10 ⁻⁴ N · cm ² / cm or less, and bending recovery is 9.8 × 10 ⁻⁴ N · cm ² / cm or less. And
The elongation percentage by the KES method in the width direction of the flange contact portion is 50% or more,
The bending rigidity by the KES method of the composite body of the absorbent structure and the sheet member is 2.55 × 10 ⁻² N · cm ² / cm or less in the width direction, and the front-rear direction orthogonal to the width direction It is 1.77 * 10 ^<-2 > N * cm ^{< 2} > / cm or less by the underpants type diaper characterized by the above-mentioned. The flange contact portion of the sheet member is
Stretch fiber nonwovens,
A laminate of the stretched nonwoven fabric and the substantially non-stretchable nonwoven fabric;
A laminate of the elastic fiber nonwoven fabric and the elastic fiber nonwoven fabric,
The diaper of Claim 1 comprised by any one of the group which consists of.   Furthermore, the diaper of Claim 2 which has the elastic member extended including the said width direction component in the said collar part contact part.   The diaper according to any one of claims 1 to 3, wherein the absorbent body has at least one of a groove extending in a vertical direction orthogonal to the width direction and an opening extending in the vertical direction.

Images