TWI756491B - Shorts-type absorbent article - Google Patents

Abstract

The subject of this invention is to provide the underpants-type absorbent article which improves the fit on the abdomen side of an absorptive core material. Means for solving the problem is a pant-type absorbent article (1) comprising: an absorptive body (10) having an absorptive core material (11), a lower end portion of which is bent back and forth; and a front belt portion ( 23), which has a front-side expansion and contraction region (23s) that expands and contracts in the left-right direction, characterized in that the absorbent core material (11) has a front-side portion (10F), which is a front-side bent portion in the front-rear direction, and the absorptive core material (11). The material (11) is attached to the front side (10F), has a pair of inclined low basis weight regions (31) which are inclined from the upper side in the vertical direction to the lower side and from the outer side in the left-right direction toward the center side, and the basis weight is lower than that of the surrounding regions. ), the entire pair of inclined low basis weight regions (31) overlaps with the front telescopic region (23s).

Description

Shorts-type absorbent article

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

The pants-type absorbent article has an absorbent core that absorbs excretion fluid such as urine. In addition, by providing a slit or the like in a part of the absorbent core material to reduce rigidity, when the pants-type absorbent article is worn, the absorptive core material is easily bent at the low rigidity portion, and is easily The technology of three-dimensional deformation of the wearer's body is well known. For example, Patent Document 1 discloses an absorbent article including an opening 63 that is offset and arranged toward the front abdomen in the longitudinal direction of the absorbent core, and is bent inward. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2007-202575

[The problem to be solved by the invention]

According to the absorbent article of Patent Document 1, the absorbent core is easily three-dimensionally deformed along the shape of the wearer's body by slits or the like provided in the absorbent core. However, in such an absorbent article, sufficient fit may not be obtained in some cases. For example, when the absorptive core material is deformed into a convex shape with respect to the skin of the wearer, a part covering a wide area on the skin side floats or sags from the body of the wearer, and the absorptive core material and the skin There is a gap between them, so there is a possibility that the fit may deteriorate. In particular, since the region from the abdomen side to the lower part of the crotch of the absorbent core is greatly deformed when the wearer moves the feet (for example, when walking), the fit easily deteriorates.

The present invention has been developed in view of the aforementioned problems, and an object of the present invention is to provide an underpants-type absorbent article in which fit is improved on the abdomen side of an absorbent core. [means to solve the problem]

The main invention for achieving the aforementioned object is a pant-type absorbent article having vertical, horizontal, and front-rear directions intersecting with each other, and comprising: an absorbent body having absorbent properties arranged along the vertical direction. The core material is bent back and forth at the lower end in the up-down direction; and is joined to the front upper end of the absorptive body and has a front belt portion that expands and contracts in the left-right direction on the front side, characterized in that the absorbent The core material has a front side portion, which is a portion bent toward the front side in the front-rear direction, and the absorptive core material has a front side portion from the upper side in the vertical direction toward the lower side and from the outer side in the left-right direction toward the center side. One pair of inclined low basis weight regions is inclined and the basis weight is lower than the surrounding regions, and the whole system of the aforementioned pair of inclined low basis weight regions is repeated with the aforementioned front side telescopic region. Other features of the present invention will be more clearly understood from the description of this specification and the drawings. [Inventive effect]

According to the present invention, it is possible to provide a pant-type absorbent article in which fit is improved on the abdomen side of the absorbent core.

At least the following matters can be made clearer based on the description of this specification and the attached drawings. An underpants-type absorbent article having vertical, horizontal, and front-rear directions intersecting with each other, and an absorbent body comprising an absorbent core material disposed along the vertical direction, at a lower end of the vertical direction. The front side belt part is joined to the front side upper end of the absorptive body and has the front side expansion and contraction area in the left and right direction, characterized in that the absorptive core material has a front side belt part in the front and rear direction. The front folded portion is the front side portion, and the absorptive core material is attached to the front side portion, has a region inclined from the upper side in the vertical direction to the lower side and from the outer side in the left-right direction toward the center side, and has a larger basis weight than the surrounding area. The lower one pair is inclined low basis weight area, and the whole system of the aforesaid pair of inclined low basis weight area is repeated with the aforesaid front side telescopic area.

According to such a shorts-type absorbent article, by arranging one pair of inclined low basis weight regions so as to be inclined from the wearer's pubis along the lower part of the crotch, the absorbent core can follow the wearer's feet freely. deformed. Moreover, when the paper diaper is worn, the absorptive core material is pressed against the lower abdomen of the wearer by the stretch force in the left-right direction acting from the non-skin side of the absorptive core material. Therefore, the fit of the absorbent body near the pubic bone of the wearer can be improved.

In the pants-type absorbent article, it is desirable that a central low basis weight penetrating the absorptive core material in the vertical direction is provided in the front side portion between the left and right directions of the pair of inclined low basis weight regions. area.

According to such an underpants-type absorbent article, when the absorbent core material is held between the feet of the wearer's crotch, the absorbent core material is easily folded in the vertical direction based on the central low basis weight region where the rigidity is lowest. It is bent to form a convex shape toward the skin side. Thereby, the absorptive core material is easily fitted along the excretion opening of the wearer.

In the pants-type absorbent article, it is desirable that the width in the short-side direction of the central low basis weight region is wider than the width in the short-side direction of each of the pair of inclined low basis weight regions.

According to such a pants-type absorbent article, since the rigidity of the central low basis weight region is smaller than that of the inclined low basis weight region, bending deformation is more likely to occur, so that the absorbent core is sandwiched in the groin of the wearer, The area of the central low basis weight area is made to be bent first, and then the inclined low basis weight area is formed as the starting point of bending deformation, whereby the absorbent core can easily deform naturally along the wearer's body shape.

In the pants-type absorbent article, it is desirable that the position of the lower end of the pair of inclined low basis weight regions is higher than the position of the lower end of the central low basis weight region in the vertical direction.

According to such a pants-type absorbent article, since the central low basis weight region is provided at a height close to the wearer's crotch portion, the absorbent core material can be easily seated as the bending inducing region for convex deformation. Function. In addition, by setting the pair of inclined low basis weight regions at a height near the pubic bone of the wearer, the absorptive core material can be easily deformed freely according to the movement of the wearer's feet.

In the pants-type absorbent article, it is desirable that the upper ends of the pair of inclined low basis weight regions are positioned higher than the upper ends of the central low basis weight regions in the up-down direction.

According to such an underpants-type absorbent article, the position of the central low basis weight region does not become too high, and the absorptive core material is not easily deformed convexly in the flat region of the wearer's abdomen. In addition, by arranging the inclined low basis weight region at a higher position than the central low basis weight region, it is easy to follow the movements of the wearer's feet, and bending deformation can easily occur up to the upper part of the absorbent core.

In the pants-type absorbent article, it is desirable to further include a rear side belt portion which is joined to the rear side upper end portion of the absorbent body and is provided with a rear side expansion-contraction region that expands and contracts in the left-right direction, and has the front side belt portion in the left-right direction. The lower end edge of the front belt portion has an inclined portion inclined obliquely from the lower end of the end joint region toward the crotch portion.

According to such an underpants-type absorbent article, when the front and rear belt parts are pulled to both sides in the left-right direction when the paper diaper is worn, the inclined part is also pulled to the outside in the left-right direction. Therefore, through the inclination part, the absorbent body becomes easy to be pulled toward the obliquely upper side. Thereby, the absorbent body becomes less likely to be displaced from the periphery of the wearer's pubic bone, so that the fit is improved.

In the pants-type absorbent article, it is desirable that a smaller angle among the angles formed by the inclined portion and the up-down direction is larger than a smaller angle among the angles formed by the inclined low basis weight region and the up-down direction. .

According to such an underpants-type absorbent article, since the absorbent body is easily pulled in the left-right direction, the stretchability in the left-right direction becomes easy for the absorbent core that is bent and deformed along the inclined low basis weight region. effect. Therefore, since the absorptive core material is easily pressed against the skin of the wearer, the fit can be improved.

As in the pants-type absorbent article, it is desirable to further include a foot wall elastic member that expands and contracts along the inclined portion, and the region where the stretchability is generated by the foot wall elastic member does not overlap with the absorptive core system.

According to such an underpants-type absorbent article, when the absorptive main body is pulled up diagonally upward, excess force hardly acts on the absorptive core material itself, and it becomes difficult to hinder the bending deformation of the absorptive core material.

In the pants-type absorbent article, it is desirable that the absorptive core material has a diameter-reduced portion in the front side portion whose width in the left-right direction is narrowed, and a portion of the diameter-reduced portion whose width in the left-right direction is narrowest is preferably Repeat with the front retractable area described above.

According to such an underpants-type absorbent article, the stretchability in the left-right direction of the front-side expansion-contraction region acts on the portion where the width in the left-right direction becomes the narrowest in the diameter-reduced portion of the absorbent core and is easily deformed. The deformed absorbent core is pressed against the wearer's skin, It becomes easy to adhere closely. Therefore, the absorptive core material can be deformed correctly according to the shape of the body, and the fit can be improved.

In the pants-type absorbent article, it is desirable that a central low basis weight penetrating the absorptive core material in the vertical direction is provided in the front side portion between the left and right directions of the pair of inclined low basis weight regions. In the region, in the vertical direction, the position of the narrowest part of the diameter-reduced portion in the horizontal direction is higher than the position of the lower end of the central low basis weight region.

According to such an underpants-type absorbent article, in the diameter-reduced portion of the absorbent core material, the width in the left-right direction is the narrowest and is easily deformed, and the force to deform the absorbent core material in the vertical direction convexly, and the fit The force of the wearer's body to stand up and deform the absorbent core from the crotch portion toward the lower abdomen is less likely to interfere with each other. Thereby, the absorptive core material can be deform|transformed correctly.

In this pants-type absorbent article, it is desirable that the pair of inclined low basis weight regions have: a pair of first inclined low basis weight regions; A pair of second inclined low basis weight regions in the inner region.

According to such an underpants-type absorbent article, in addition to a pair of first inclined low basis weight regions, a pair of second inclined low basis weight regions is provided, whereby bending when deforming the absorbent core material is achieved. The starting point increases so that the absorbent core becomes able to deform more smoothly.

In the pants-type absorbent article, the length in the longitudinal direction of the pair of second inclined low basis weight regions is desirably shorter than the length in the longitudinal direction of the pair of first inclined low basis weight regions.

According to such an underpants-type absorbent article, the bending deformation of the absorbent core is reduced in the second inclined low basis weight region on the inner side in the left-right direction, and the first inclined low basis weight region on the outer side in the left-right direction absorbs The bending deformation of the core material becomes larger. Therefore, the absorptive core material is located in a region close to the outer side in the left-right direction of the wearer's foot, and is easily deformed to a large extent and easily follows the movement of the foot.

In the pants-type absorbent article, it is desirable that the position of the lower end of the pair of second inclined low basis weight regions is higher than the position of the lower end of the pair of first inclined low basis weight regions in the vertical direction.

According to such a pants-type absorbent article, by extending the inclined low basis weight region on the outer side in the left-right direction to a position as low as possible in the up-down direction, the absorbent core material can be reduced even in the region close to the groin of the wearer. It also becomes easy to bend and deform, making it easier to follow the movements of the wearer's feet.

In the pants-type absorbent article, it is desirable that the absorptive core material has a first upper-side low-basis-weight region in the front-side portion along the up-down direction, the basis weight of which is lower than that of the surrounding region; and along the up-down direction direction, the basis weight becomes lower than the surrounding area of the first lower low basis weight area, the lower end of the first upper low basis weight area is connected to the upper end of the first inclined low basis weight area, the first inclined low basis weight area The lower end of the heavy region is connected to the upper end of the first lower low basis weight region.

According to such an underpants-type absorbent article, the influence of distortion, stress, etc., which are generated when the absorbent core is deformed in the inclined low basis weight region, can be dispersed in the upper low basis weight region and the lower low basis weight region. Thereby, in this area, the absorptive core material can be deform|transformed more naturally.

In the pants-type absorbent article, it is desirable that the absorptive core material is attached to the front side portion, and has a second upper low basis weight region along the vertical direction whose basis weight is lower than that of surrounding regions, and the second upper side The lower end of the low basis weight region is connected to the upper end of the second inclined low basis weight region.

According to such an underpants-type absorbent article, the influence of distortion, stress, etc., which are generated when the absorbent core is deformed in the second inclined low basis weight region, can be dispersed in the second upper low basis weight region. Thereby, in this area, the absorptive core material can be deform|transformed more naturally.

=== Implementation form === Hereinafter, as the [pants-type absorbent article] of the present invention, an embodiment will be described by taking an adult underpants-type disposable diaper 1 (hereinafter also referred to as a [disposable diaper 1]) as an example. However, the underpants-type absorbent article of the present invention can also be used, for example, as disposable diapers for children, sanitary products (pants-type sanitary napkins), and the like. <<The overall structure of the disposable diaper 1>> FIG. 1 is a schematic perspective view of a disposable diaper 1 . Fig. 2 is a schematic plan view of the paper diaper 1 in an unfolded and extended state viewed from the non-skin side. Fig. 3 is a schematic cross-sectional view taken along the line I-I in Fig. 2 . In addition, the [extended state] of the disposable diaper 1 refers to the state in which the disposable diaper 1 is stretched to a wrinkle-free state, and the dimensions of the respective members (for example, the outer covering member 20 and the like described later) constituting the disposable diaper 1 are extended until they are equal to the size of the member. A state in which the size of the body is the same as or a length close to that size.

The paper diaper 1 has an up-down direction, a left-right direction, and a front-rear direction that intersect with each other, and as shown in FIG. 3 , has a thickness direction in which each member is laminated. In the vertical direction, the side serving as the wearer's waistline is defined as the upper side, and the side serving as the wearer's crotch is defined as the lower side. In the front-back direction, the side serving as the wearer's abdomen side is defined as the front side, and the side serving as the wearer's back side is defined as the rear side. In the thickness direction, the side in contact with the wearer's body is called the skin side, and the opposite side is called the non-skin side. In addition, in the unfolded state of FIG. 2, the paper diaper 1 has the longitudinal direction and the width direction which mutually intersect. The length direction is the direction along the up-down direction, and the width direction is the same direction as the left-right direction.

The paper diaper 1 has an absorptive body 10 having a rectangular shape in a plan view; The exterior member 20 includes: an abdomen-side exterior member 21 (front belt portion 21 ) located on the front side in the front-rear direction in FIG. 1 , and a back-side exterior member 22 (rear belt portion 22 ) located on the rear side in the front-rear direction ; And the crotch exterior member 23 (crotch member 23) connecting these members. The aforementioned members adjacent to each other in the thickness direction are joined with an adhesive or the like.

Moreover, the front side belt part 21 is located in the one end side of the longitudinal direction of the absorptive main body 10, and the rear side belt part 22 is located in the other end side of the longitudinal direction of the absorptive main body 10. In the longitudinal direction of the absorbent body 10 , the side where the front belt portion 21 exists is referred to as the front side, and the side where the rear belt portion 22 exists is referred to as the rear side. That is, the front-side belt part 21 is located at the front-side upper end of the absorbent body 10 , and the rear-side belt part 22 is located at the rear-side upper end part of the absorbent body 10 . In addition, the crotch member 23 is positioned closer to the skin than the front belt portion 21 and the rear belt portion 22 .

In addition, in the disposable diaper 1 of this embodiment, although the exterior member 20 consists of three members, it is not limited to this. For example, the front belt part 21, the rear belt part 22, and the crotch member 23 may be a single member. Moreover, the structure which does not have the crotch member 23 may be a structure in which a member different from the outer covering member 20 is further laminated on the non-skin side than the outer covering member 20 .

In the unfolded paper diaper 1 shown in FIG. 2 , the absorbent body 10 is folded in half at a predetermined position CL in the longitudinal direction, and the left and right side portions of the front belt portion 21 and the left and right sides of the rear belt portion 22 are folded in half. The side parts are joined by welding or the like, thereby forming a shorts type as shown in FIG. 1 . That is, the longitudinal direction of the absorbent body 10 is along the up-down direction of the disposable diaper 1, and the front belt portion 21 and the rear belt portion 22 are connected in an annular shape to form a waist opening 1a and a pair of leg openings 1b. Hereinafter, the area where the front-side belt portion 21 and the rear-side belt portion 22 are joined will be referred to as an end portion joining area 24 .

In addition, in this specification, in the absorbent main body 10 (absorptive core material 11 ) bent at the predetermined position CL, the part folded to the front side is referred to as [front side part 10F], and the part folded to the rear side is referred to as the "front side part 10F". It is [rear side part 10R]. That is, in the longitudinal direction of FIG. 2 , the area on the front side of the predetermined position CL of the absorptive main body 10 (absorptive core material 11 ) may be referred to as [front side portion 10F], and the area may be referred to as [front side portion 10F] in the longitudinal direction of FIG. 2 . The area on the further rear side of the position CL is referred to as [rear side portion 10R].

As shown in FIG. 3 , the absorptive main body 10 includes an absorptive core 11 , a top sheet 12 positioned on the skin side of the absorptive core 11 , and a back sheet 13 positioned on the non-skin side of the absorptive core 11 . 4A is a schematic plan view of the absorptive main body 10 in the unfolded and stretched state viewed from the skin side. FIG. 4B is a cross-sectional view taken along the line A-A of FIG. 4A . In addition, in FIG. 4B, for the simplification of description, the low basis weight area (mentioned later) provided in the absorptive core material 11 is not shown.

The absorbent core 11 is a member that absorbs and retains excretion fluids such as urine, and is formed of, for example, liquid absorbent fibers such as pulp fibers mixed with superabsorbent polymers (SAP). The absorbent core 11 of the present embodiment has a narrowed diameter portion 11c whose width in the left-right direction is narrowed between the front end and the rear end in the longitudinal direction, and has an hourglass clock shape when viewed from a plan view as shown in FIG. 4A . . Moreover, in the absorptive core material 11, the area|region where the basis weight is lower than the surroundings, ie, various low basis weight area|regions, is formed. Details of the low basis weight region will be described later. In addition, the outer peripheral surface of the absorptive core material 11 may be covered with a liquid-permeable sheet such as tissue paper and nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet, and for example, a hydrophilic hot air nonwoven fabric, a spunbond nonwoven fabric, or the like can be used. The back sheet 13 has a two-layer structure of a liquid-impermeable sheet 13a and a hydrophobic sheet 13b arranged on the non-skin side. As the liquid-impermeable sheet 13a, for example, a resin film or the like can be used, and as the hydrophobic sheet 13b, for example, a flexible hydrophobic nonwoven fabric or the like can be used. Furthermore, the back sheet 13 may have a single-layer structure of the liquid-impermeable sheet 13a.

Side sheets 14 are provided on both sides in the left-right direction of the back sheet 13 . The side sheets 14 extend further outward in the left and right direction than the two ends 11es and 11es in the left and right direction of the absorbent core 11 , and take the two ends 10es and 10es in the left and right direction of the absorbent body 10 as folding positions, and the left and right ends of the absorbent body 10 are The inner side and the skin side in the thickness direction are folded back to form a pair of leak-proof wall portions 40 . In the leak-proof wall portion 40 , leak-proof wall elastic members 41 and 42 such as rubber threads are fixed in a state of being extended along the longitudinal direction (up-down direction) of the absorbent body 10 . By this, the leakage preventing wall elastic members 41 and 42 are contracted in the longitudinal direction, so that the pair of leakage preventing wall portions 40 stand up to the skin side at both end portions in the left-right direction of the absorbent body 10 to serve as leakage preventing for the disposable diaper 1 . The walls (foot folds) function. Furthermore, the side sheet 14 may not be provided, and the back sheet 13 (liquid-permeable sheet 13b) may be extended to the outer side in the left-right direction of the absorptive core 11, thereby forming the leak-proof wall portion 40.

As shown in FIG. 2, the front belt portion 21 and the rear belt portion 22 respectively have waist regions 211 and 221 having end joint regions 24 in the up-down direction, and a crotch side lower than the waist regions 211 and 221. Regions 212, 222. The waistline regions 211 and 221 are rectangular in plan view. The crotch side regions 212 and 222 are formed in a substantially trapezoidal shape, and the outer edge portions thereof have inclined portions 212s and 222s inclined toward the lower side in the up-down direction and toward the inner side in the left-right direction. That is, the lateral widths of the crotch side regions 212 and 222 are narrowed toward the lower side. Furthermore, in the present embodiment, the crotch side region 222 of the rear belt portion 22 is larger than the crotch side region 212 of the front belt portion 21, and can cover the buttocks of the wearer widely.

As shown in FIG. 3, the front belt portion 21 and the rear belt portion 22 respectively include: skin-side sheets 213, 223 on the skin side; non-skin-side sheets 214, 224 on the non-skin side; and between the sheets , and stretchable nonwoven fabrics 215 and 225 having stretchability at least in the left-right direction of the disposable diaper 1 .

The skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 are preferably flexible sheets, and for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, or the like can be used.

The stretchable nonwoven fabrics 215 and 225 are, for example, polypropylene (PP) including a polyurethane-based elastomer having elastic thermoplastic elastomer fibers and a polyolefin-based resin having inelastic thermoplastic resin fibers. , a non-woven fabric with appropriate stretching treatment such as gear stretching. By this stretching process, the stretchable nonwoven fabrics 215 and 225 are made stretchable in a predetermined direction. In addition, the extension process may be performed in directions orthogonal to each other, or may be performed only in a predetermined direction. When the stretching treatment is performed only in the predetermined direction, the stretchability in the predetermined direction is produced, but the orientation of all the fibers is not necessarily only in the predetermined direction, and therefore the stretchability is also produced in the direction orthogonal to the predetermined direction.

The skin-side sheets 213, 223, the non-skin-side sheets 214, 224, and the stretchable nonwoven fabrics 215, 225 are joined by a plurality of welding parts 25a, 25b (for example, the areas where ultrasonic welding is performed) that are dispersed, so the ratio of Since, for example, it is joined by a cured adhesive, the skin becomes soft to the touch. Furthermore, the stretchable nonwoven fabrics 215 and 225 are contracted between the welded portions 25a and 25b so that the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 are bent and protruded outward in the thickness direction. That is, since the skin-side sheets 213, 223 and the non-skin-side sheets 214, 224 bulge between the welded portions 25a, 25b, the skin feels softer, and the user can be visually given a soft impression. .

With such a configuration, the entire front belt portion 21 and the rear belt portion 22 have stretchability in the left-right direction (and the vertical direction) of the disposable diaper 1 . The area in which the front-side belt portion 21 is stretchable in the left-right direction is referred to as a front-side extension area 21s, and the area in which the rear-side belt portion 22 is stretchable in the left-right direction is referred to as a rear-side extension area 22s (refer to the hatched portion in FIG. 5 ). ). In addition, as shown in FIG. 2, the welding parts 25a and 25b are dispersed at narrow intervals. Therefore, in the disposable diaper 1 of the present embodiment, thin protrusions (wrinkles) extending in multiple directions can be generated, and the occurrence of wrinkles in one direction (longitudinal wrinkles) peculiar to disposable diapers can be prevented, so that the appearance of the disposable diaper 1 is good.

Furthermore, a stretchable film may be used instead of the stretchable nonwoven fabrics 215 and 225. However, since the thickness of the stretchable film is substantially uniform, the protrusions of the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 between the welded portions 25a and 25b are easily crushed. On the other hand, since the thickness of the stretchable nonwoven fabrics 215 and 225 increases between the welded parts 25a and 25b, the protrusions of the skin-side sheets 213 and 223 and the non-skin-side sheets 214 and 224 are not easily crushed, and the skin feel can be maintained. softness, aesthetics, etc.

In addition, in the region where the welded portions 25a and 25b are dispersed, the first dispersed region X that overlaps with the absorbent body 10 in the thickness direction and the second dispersed region Y other than that can make the welding portions 25a and 25b dispersed. The shape, the ratio of the welded portions 25a and 25b per unit area, and the like are different. In addition, in FIG. 2, in the 1st scattered existence area|region X, the welding part 25a of the substantially rectangular shape inclined by 45 degrees or -45 degrees with respect to the left-right direction is arrange|positioned alternately. Moreover, in the 2nd scattered existence area|region Y, the circular welding part 25b is arrange|positioned in a zigzag shape.

Moreover, compared with the 1st scattered presence area|region X, the area of the welding part 25b per unit area of the 2nd scattered presence area|region Y becomes smaller. Therefore, in the waistline regions 211 and 221 where problems such as sweating and stuffiness are likely to occur, it is possible to prevent the air permeability from being hindered by the welded portion 25b, and to ensure appropriate air permeability. Moreover, in the 1st scattered existence area|region X which overlaps with the absorptive main body 10, the shrinkage of the front side belt part 21 and the back side belt part 22 is suppressed suitably, and the contraction|shrinkage of the left-right direction of the absorptive main body 10 can be reduced.

In addition, the front belt portion 21 and the rear belt portion 22 are provided with a plurality of waist elastic members 26 such as rubber threads in regions along the waist opening 1a. Similarly, in the region along the foot hole opening 1b, a plurality of foot hole elastic members 27 such as rubber threads are arranged. That is, the waist and foot circumferences of the paper diaper 1 are firmly attached to the wearer's body by the waist elastic member 26 and the foot circumference elastic member 27, so that the slippage of the paper diaper 1 and leakage from the foot circumference can be prevented. Wait. In addition, the other parts are fitted to the wearer's body gently through the stretchable non-woven fabrics 215 and 225, so that the tight feeling can be reduced.

The crotch member 23 is formed to have a slightly hourglass clock shape in a plan view when the center portion in the longitudinal direction is curved inward in the left-right direction. Moreover, as shown in FIG. 3, the crotch member 23 has: a skin-side sheet 231 located on the skin side; a non-skin-side sheet 232 located on the non-skin side; A stretchable nonwoven fabric 233 having stretchability (longitudinal direction of the absorbent body 10). These sheets 231 to 233 are joined by a plurality of welding parts (for example, the same welding part 25b as the second dispersed region Y). In the crotch member 23, the area|region which generate|occur|produces the stretchability along an up-down direction is 23 s of crotch expansion-contraction areas (refer the shaded part of FIG. 5).

By providing the crotch stretch region 23s, the absorbent core 11 can be closely attached to the wearer's crotch, and even if the weight of the absorbent core 11 increases due to excretion, the sagging of the diaper 1 can be suppressed. In addition, a plurality of crotch elastic members 28 are arranged in a region along the foot opening 1b of the crotch member 23, and the crotch member 23 is in close contact with the wearer's foot.

<<About the deformation of the absorptive core material 11>> When the disposable diaper 1 is worn, the absorbent core 11 (absorptive main body 10 ) deforms according to the movement of the wearer's body.

FIG. 5 is a schematic plan view of the paper diaper 1 in an unfolded and extended state, and is a diagram illustrating the positional relationship between various stretchable regions (21s, 22s, 23s) and the absorbent core 11. FIG. Fig. 6 is a plan view of the absorptive core material 11 viewed from the skin side.

As shown in FIG. 5 , the absorbent core 11 has the [lower abdomen portion 11A] positioned on the wearer's lower abdomen when worn; the [crotch portion 11B] positioned on the wearer's crotch portion; and the wearer's crotch portion [11B]. of the buttocks [hip position 11C]. In FIG. 5 , the part overlapping the front belt part 21 is the lower abdomen part 11A, the part overlapping the rear belt part 22 is the buttock part 11C, and the part between these parts is the crotch part 11B. That is, the lower abdomen area 11A is located at the front side portion 10F of the disposable diaper 1 , and the buttocks area 11C is located at the rear side portion 10R of the disposable diaper 1 . Moreover, the crotch part 11B is located in the lower end part of the up-down direction of the shorts-shaped disposable diaper 1, and is provided in the part extending over the front side part 10F and the rear side part 10R over the predetermined position CL.

However, the range of the [crotch part 11B] shown in FIG. 5 is only an example, and it is not limited to this. For example, in the longitudinal direction, the area from the lower end of the end joint region 24 of the front belt portion 21 to the lower end of the end joint region 24 of the rear belt portion 22 may be set as the central region when 1/3 crotch area.

The absorptive core material 11 is located above the lower end (position corresponding to the predetermined position CL) in the vertical direction of the paper diaper 1 and is on the front side (front side portion 10F) in the front-rear direction, and has a base of the absorptive core material 11 more than the surrounding area. The area where the weight becomes lower is also the [inclined low basis weight area 31]. The inclined low basis weight region 31 includes a first inclined low basis weight region 311 , and a second inclined low basis weight region 312 arranged on the inner side in the left-right direction than the first inclined low basis weight region 311 . The respective inclined low basis weight regions 311 and 312 are regions inclined from the upper side in the vertical direction to the lower side and from the outer side in the left-right direction toward the center side, and a pair is provided on the front side of the absorptive core 11 on the left and right sides. Moreover, in the disposable diaper 1, the 1st inclined low basis weight area|region 311 and the 2nd inclined low basis weight area|region 312 are arrange|positioned in parallel.

In addition, the [basic weight] of the absorptive core material 11 means the mass (g/m ² ) per unit area of the absorptive core material 11 (for example, SAP liquid-absorbent fibers are mixed). The comparison of the basis weight of the absorptive core material 11 in the inclined low basis weight region 31 and the surrounding region may be performed by a conventional method. For example, there is a method of visually comparing. There is also a method of cutting out the target site as a sample from the absorbent core 11, measuring the mass of each sample and the area of each sample, calculating the mass per unit area, and comparing. The same applies to other low basis weight regions described below.

The absorptive core material 11 is easy to bend with the inclined low basis weight region 31 as a starting point due to the difference in rigidity between the inclined low basis weight region 31 and the surrounding region. Therefore, when the disposable diaper 1 is worn, the absorptive core material 11 is folded with the inclined low basis weight region 31 as a starting point, so that it is easy to deform according to the unevenness of the wearer's body, and it becomes easy to fit the wearer's body. the user's body. In particular, the sloping low basis weight region 31 abuts obliquely from the wearer's pubic periphery to the groin. That is, it becomes a bending starting point along the shape of the root of the wearer's foot. Therefore, even when the wearer walks or the feet move back and forth, the absorptive core material 11 can follow the movement of the feet on the abdomen side of the wearer, and can be folded three-dimensionally, and can be easily freed according to the movement of the body. deformed.

Moreover, as shown in FIG. 6, the absorptive core material 11 is attached to the upper side of the lower end (refer to FIG. 1) in the vertical direction of the paper diaper 1 and the front side (front side part 10F) in the front-rear direction, and has an absorptive core more than the surrounding area. The area where the basis weight of the material 11 becomes low is the [central low basis weight area 32 ]. The central low basis weight region 32 is located at the center of the left-right direction of the absorbent core 11, and is arranged along the vertical direction (longitudinal direction). The direction is a slightly rectangular area that is longer in the vertical direction. Similarly, the [central low basis weight region 33 ] corresponding to the central low basis weight region 32 is provided on the upper side of the lower end in the vertical direction of the disposable diaper 1 and on the rear side (rear side portion 10R) in the front and rear direction. In this embodiment, it is assumed that the absorptive core material 11 does not exist in the central low basis weight regions 32 and 33 . That is, the central low basis weight regions 32 and 33 are holes through which the absorptive core material 11 penetrates in the thickness direction.

Furthermore, in the absorbent core 11, in addition to the aforementioned inclined low basis weight regions 31, central low basis weight regions 32, 33, and the like, regions are provided as compared with the peripheral regions, and the basis weight of the absorptive core material 11 becomes lower. A plurality of [low basis weight regions] (refer to Figure 6).

Next, the deformation|transformation of the absorptive core material 11 at the time of wearing the paper diaper 1 is demonstrated concretely. FIG. 7 is a schematic perspective view illustrating deformation of the absorbent core 11 when the paper diaper 1 is worn.

In the disposable diaper 1, in the central low basis weight regions 32 and 33, the absorptive core material 11 is penetrated in the thickness direction, and the rigidity becomes the lowest. Therefore, the absorptive core material 11 is attached to the central low basis weight regions 32 and 33, and the bending deformation is most likely to occur. Therefore, when the disposable diaper 1 is worn, if the absorbent core 11 is sandwiched between the feet of the wearer at the lower part of the crotch, the absorbent core 11 will follow the upper and lower portions of the central low basis weight regions 32 and 33 . The direction (the longitudinal direction of the absorptive core material 11) is bent right and left. Thereby, in the crotch region 11B between the central low basis weight regions 32 and 33 in the longitudinal direction, as shown in FIG. The convex portion 11t is formed. That is, the central low basis weight regions 32 and 33 have the function of [bending induction region] for bending the crotch region 11B of the absorptive core material 11 in the longitudinal direction. By deforming the absorptive core 11 to the skin side in the crotch region 11B, the convex portion 11t can be easily fitted along the wearer's excretory opening, the groin of the buttocks, etc., and the excretion absorbency can be improved in the crotch region.

Moreover, in the front side part 10F, from the crotch region 11B to the lower abdomen region 11A, the absorptive core material 11 stands up along the curved shape of the abdomen of the wearer. Moreover, in the rear side part 10R, from the crotch region 11B to the buttocks region 11C, the absorptive core material 11 stands up along the curved shape of the buttocks of the wearer. Thereby, when the disposable diaper 1 is worn, the absorptive core material 11 can be deformed into a shape as shown in FIG. 7 .

In addition, the width d32 in the short-side direction of the central low basis weight region 32 is larger than the width d31 in the short-side direction of the inclined low basis weight region 31 (d32>d31). Therefore, the rigidity of the central low basis weight region 32 is smaller than that of the inclined low basis weight region 31, and bending deformation is more likely to occur. Therefore, by sandwiching the absorbent core 11 in the groin of the wearer, the region between the central low basis weight regions 32 and 33 is first folded, and then the inclined low basis weight region 31 is formed to be bent and deformed. starting point. Thereby, when the disposable diaper 1 is worn, the absorptive core material 11 is easily deformed to be convex along the shape of the wearer's body between the central low basis weight regions 32 and 33 . Moreover, after wearing, the absorptive core material 11 can easily deform naturally along the inclined low basis weight region 31 in response to the movement of the wearer's feet.

However, since the absorptive core material 11 is three-dimensionally deformed so as to have unevenness on the wearer's skin, a part where the absorptive core material 11 floats from the wearer's skin is generated. There is a risk of deterioration of the fit in the area. FIG. 8 is a schematic cross-sectional view illustrating a state in which the absorptive core material 11 is lifted from the wearer's body (skin). This FIG. 8 shows the cross-sectional shape of the wearer's lower abdominal area when viewed from the upper side, and the cross-sectional shape of the absorbent core 11 deformed in the lower abdominal area 11A.

In the lower abdomen of the wearer, the absorptive core material 11 is deformed into a substantially W-shaped cross section as shown in FIG. 8 . That is, in the center part of the left-right direction, the bending deformation|transformation which becomes convex toward the wearer's skin side arises, and the convex part 11t is formed. Moreover, on both sides of the left-right direction of the convex part 11t, a pair of inclined low basis weight regions 31 is used as a starting point, and bending deformation arises so that it may become a concave shape toward the wearer's skin side. As a result, a gap is likely to be generated between the portion folded by the inclined low basis weight region 31 and the wearer's skin. Moreover, since the absorptive core material 11 receives a compressive force in the left-right direction by being sandwiched between the wearer's feet, it tends to float toward the non-skin side, forming the center portion of the absorptive core material 11 in the left-right direction. Pushed out from both ends. That is, there is a possibility that the absorptive core material 11 will be bent and deformed three-dimensionally, and it may become difficult to fit the wearer's skin.

On the other hand, in the disposable diaper 1 of the present embodiment, the entire system of the inclined low basis weight region 31 of the absorptive core 11 overlaps with the front stretchable region 21s of the front belt portion 21 (see FIG. 5 ). That is, in the absorptive core material 11, the stretchability in the left-right direction acts on the region where the inclined low basis weight region 31 is arranged. Thereby, the absorptive core material 11 bent and deformed starting from the inclined low basis weight region 31 can be brought into close contact with the skin of the wearer. FIG. 9 is a schematic cross-sectional view illustrating a case where the contraction force in the left-right direction of the front-side expansion-contraction region 21s acts on the absorptive core 11 in FIG. 8 .

In FIG. 9 , the portion of the inclined low basis weight region 31 of the absorbent core 11 that is deformed into a concave shape toward the wearer's skin is moved from the wearer's non-skin side to the skin side by the front stretchable region 21s. Press. That is, the absorptive core material 11 is folded and deformed by following the movement of the wearer's body, and the contraction force in the left-right direction of the front expansion-contraction region 21s acts from the non-skin side, so that the absorptive core material 11 is in close contact with each other. On the skin of the wearer, a gap is less likely to be generated between the absorptive core material 11 and the skin of the wearer. Therefore, the fit of the absorptive core material 11 in the vicinity of the pubic bone of the wearer can be improved.

In addition, the inclined low basis weight area|region 31 of the absorptive core 11 does not necessarily need to overlap with 21 s of front side expansion-contraction areas as a whole. For example, if the end portion in the vertical direction of the inclined low basis weight region 31 does not receive the expansion and contraction force by the front side expansion and contraction region 21s, but the region other than the end portion receives the expansion and contraction force, as shown in FIG. Fits well to the wearer's body.

Moreover, in the front side part 10F, the upper and lower ends 31ed in the vertical direction of the pair of inclined low basis weight regions 31 are positioned higher than the lower ends 32ed of the central low basis weight region 32 . As described above, the central low basis weight region 32 is attached to the crotch region 11B and functions as a bending inducing region for convexly deforming the absorbent core 11, so it is desirably provided at a position close to the wearer's crotch. In addition, since the inclined low basis weight region 31 serves as a starting point for deformation of the absorptive core material 11 according to the movement of the wearer's feet, it is desirable to be provided in the vicinity of the pubic bone of the wearer. In addition, the lower end 31ed of the pair of inclined low basis weight regions 31 refers to the lower end in the vertical direction of the lower end 311ed of the first inclined low basis weight region 311 and the lower end 312ed of the second inclined low basis weight region 312 . In the present embodiment, the lower end 311ed of the first inclined low basis weight region 311 is the lower end 31ed of the inclined low basis weight region 31 (see FIG. 6 ).

Similarly, in the front side portion 10F, the upper ends 31eu in the vertical direction of the pair of inclined low basis weight regions 31 are positioned higher than the upper ends 32eu of the central low basis weight region 32 . The area that is closer to the upper side in the vertical direction than the central low basis weight area 32 is the area that comes into contact with the wearer's abdomen when the paper diaper 1 is worn, and is an area close to a flat surface (see FIG. 7 ). Therefore, in this area , in order to make the absorptive core material 11 less deformable, the position of the upper end 32eu is set so as not to be too high. In addition, the inclined low basis weight region 31 is deformed to the upper side of the absorptive core material 11 in order to follow the movement of a wearer's foot, and the upper end 31eu is arrange|positioned as high as possible. The upper end 31eu of the pair of inclined low basis weight regions 31 refers to the upper end 311eu of the first inclined low basis weight region 311 and the upper end 312eu of the second inclined low basis weight region 312 located on the upper side in the vertical direction. In the present embodiment, the upper end 311eu of the first inclined low basis weight region 311 and the upper end 312eu of the second inclined low basis weight region 312 have the same height, and both become the upper end 31eu of the inclined low basis weight region 31 .

Moreover, the absorptive core material 11 of the present embodiment has a pair of second inclined low basis weight regions 312 on the inner side in the left-right direction of the pair of first inclined low basis weight regions 311, but this first inclined low basis weight Both the region 311 and the second inclined low basis weight region 312 serve as the bending origin of the absorptive core material 11 . In the present embodiment, the absorptive core material 11 can be deformed in stages by having a plurality of such bending starting points in the left-right direction. That is, by providing a plurality of bending starting points in the left-right direction, the absorptive core material 11 can be bent more smoothly, and a three-dimensional curved surface along the body shape can be easily formed in the vicinity of the pubic bone of the wearer.

In addition, by forming the length in the longitudinal direction of the first inclined low basis weight region 311 to be longer than the length in the longitudinal direction of the second inclined low basis weight region 312, it becomes easier to follow the movement of the body. With such a configuration, since the bending starting point of the second inclined low basis weight region 312 arranged on the inner side in the left-right direction is shortened, the bending deformation of the absorptive core material 11 is reduced in the inner region. . In addition, since the bending starting point of the first inclined low basis weight region 311 arranged on one of the outer sides in the left-right direction becomes long, the bending deformation of the absorptive core material 11 increases in the outer region. Therefore, the absorptive core material 11 is attached to a region close to the outer side in the left-right direction of the wearer's foot, and is more easily deformed to follow the movement of the foot.

In addition, in the vertical direction, the position of the lower end 311ed of the first inclined low basis weight region 311 is lower than the position of the lower end 312ed of the second inclined low basis weight region 312 . In this way, by extending the first inclined low basis weight region 311 to a position as low as possible in the vertical direction, even in the region close to the wearer's groin, the absorptive core material 11 is likely to be bent and deformed. It is easier to follow the movements of the wearer's feet.

Further, on the upper side in the vertical direction of the upper end 311eu of the first inclined low basis weight region 311, a first upper low basis weight region 341 along the vertical direction (longitudinal direction) is connected. On the lower side in the vertical direction of the lower end 311ed, a first lower low basis weight region 351 along the vertical direction is connected. That is, the lower end 341ed of the first upper low basis weight region 341 is connected to the upper end 311eu of the first inclined low basis weight region 311 , and the lower end 311ed of the first inclined low basis weight region 311 is connected to the first lower low basis weight region 351 . The upper end 351eu of the first upper side low basis weight region 341 is continuous with the first inclined low basis weight region 311 and the first lower side low basis weight region 351 in the up-down direction.

If the first upper low basis weight region 341 is not continuously provided at the upper end 311eu of the first inclined low basis weight region 311, distortion, stress, etc. caused by the bending deformation of the absorptive core material 11 may concentrate on the upper end 311eu, the absorptive core material 11 may be damaged at the upper end 311eu, or the natural deformation of the absorptive core material 11 may be hindered. On the other hand, in the present embodiment, since the first upper low basis weight region 341 is continuously provided at the upper end 311eu of the first inclined low basis weight region 311 , stress and the like can be easily dispersed to the first upper low basis weight region 341 side. Similarly, in the present embodiment, since the first lower low basis weight region 351 is continuously provided at the lower end 311ed of the first inclined low basis weight region 311, stress and the like can be easily dispersed to the first lower low basis weight region 351 side. Thereby, in this area, the absorptive core material 11 can be deform|transformed more naturally.

In addition, the second upper low basis weight region 342 along the vertical direction (longitudinal direction) is connected to the upper side in the vertical direction of the upper end 312eu of the second inclined low basis weight region 312 . That is, the upper end 312eu of the second inclined low basis weight region 312 is connected to the lower end 342ed of the second upper low basis weight region 342 . Similar to the aforementioned first upper low basis weight region 341, this second upper low basis weight region 342 can also disperse the stress generated by the bending deformation starting from the second inclined low basis weight region 312, and can absorb the stress. The core material 11 deforms more naturally. In addition, a low basis weight region corresponding to the first lower low basis weight region 351 is not provided on the lower side in the vertical direction of the lower end 312ed of the second inclined low basis weight region 312 . In the second inclined low basis weight region 312, the deformation amount of the absorbent core 11 is smaller than that in the first inclined low basis weight region 311, so the influence of twist, stress, etc. is small, and the second upper low basis weight The region 342 can sufficiently disperse stress and the like. Therefore, in the 2nd inclined low basis weight area|region 312, even if a low basis weight area|region is not provided in the lower side, the absorptive core material 11 can be deform|transformed naturally.

Further, the front belt portion 21 is attached to the crotch side region 212 which is closer to the lower side than the lower end of the end joint region 24, and has a lower side in the up-down direction and an inner inclination in the left-right direction (that is, an inclination toward the crotch portion). The inclined portion 212s. When the disposable diaper 1 is worn, the both ends of the front and rear belt portions 21 and 22 in the left and right direction are pulled outward and the waist opening 1a is enlarged, and the inclined portion 212s is also pulled outward in the left and right direction. The absorbent body 10 joined by 212s is also pulled by the inclined portion 212s. That is, the sloping portion 212s acts as a force that pulls the absorptive body 10 obliquely upward, so that the absorptive body 10 (absorptive core 11 ) is not easily displaced from the periphery of the pubic bone of the wearer, so that the fit can be improved. promote.

In the present embodiment, the pulling force in the left-right direction is easily transmitted to the entire inclined portion 212s due to the stretchability of the front-side expansion-contraction region 21s. In addition, by arranging the leg elastic member 27 along the inclined portion 212s, the pulling force of the inclined portion 212s can easily act on the absorbent body 10. Therefore, even when the absorptive main body 10 absorbs excrement and becomes heavy, for example, the absorptive main body 10 can be pulled up firmly, and positional displacement can be suppressed easily.

However, the area|region which generate|occur|produces the elasticity of the foot-circumferential elastic member 27 and the absorptive core material 11 do not overlap. Thereby, when the absorptive main body 10 is pulled up obliquely upward, the excess force does not easily act on the absorptive core material 11 itself, it becomes difficult to hinder the bending deformation of the absorptive core material 11, and the absorptive core material can also be suppressed. The material 11 floats from the wearer's body. In addition, the foot circumference elastic member 27 is fastened to the lower end of the front belt portion 21 (the lower end of the lower abdominal region 11A), and is cut along the left-right direction (see FIG. 5 ). That is, in the lower end part of the foot-circumferential elastic member 27, the stretchability along the up-down direction is easy to generate|occur|produce, and it is hard to generate|occur|produce the stretchability along the left-right direction. Therefore, by the expansion-contraction force of the foot-hole elastic member 27, it is more difficult to act on the absorptive core material 11 arrange|positioned inside the left-right direction of this foot-hole elastic member 27.

In the disposable diaper 1 of the present embodiment, the inclination angle θ212s of the inclined portion 212s to the vertical direction is larger than the inclination angle θ31 of the inclined low basis weight region 31 to the vertical direction (θ212s>θ31). Here, the inclination angle with respect to the up-down direction refers to the smaller angle among the angles formed by the up-down direction and the inclined portion 212s and the like as shown in FIG. 2 . When the inclination angle θ212s of the inclined portion 212s is smaller than the inclination angle θ31 of the inclined low basis weight region 31, the absorbent main body 10 (absorptive core material 11) is more easily pulled upward, and the absorbent body 10 (absorptive core material 11) can be pulled upward more easily. The absorptive core material 11 in which the heavy region 31 is bent and deformed does not allow sufficient stretchability in the left-right direction, so that the absorptive core material 11 tends to float from the wearer's skin. Moreover, there exists a possibility that a torsion, a strain, etc. may arise in the absorptive core material 11 in a folded and deformed state, and the fit may deteriorate. On the other hand, by making the inclination angle θ212s larger than the inclination angle θ31, the absorptive core material 11 can be appropriately deformed, and the elasticity in the left-right direction can be stably applied, so that the absorptive core material 11 can be easily It adheres closely to the wearer's skin and improves the fit.

Moreover, in the paper diaper 1, the width becomes the narrowest in the part 11 cmin of the diameter-reduced part 11c in which the width|variety in the left-right direction of the absorptive core material 11 narrows, and the rigidity in the left-right direction is also the lowest. In addition, this part 11cmin overlaps with the front side expansion-contraction area 21s (refer FIG. 6). Therefore, this portion 11cmin is easily formed as a deformation starting point when the lower abdomen portion 11A of the absorptive core 11 rises from the crotch portion to the lower abdomen side and deforms when the paper diaper 1 is worn. That is, the absorptive core material 11 is fastened to the site|part 11 cmin, it deform|transforms easily, and it floats easily from a wearer's skin. On the other hand, in the present embodiment, the stretchability in the left-right direction of the front-side stretchable region 21s acts on the portion 11 cmin having the narrowest width in the left-right direction of the absorptive core 11, so that the floating area can be removed. The absorptive core material 11 is pressed against the skin of the wearer and adheres closely. Thereby, the absorptive core material 11 can not only be deformed according to the shape of the wearer's body, but also can stably cover the periphery of the wearer's pubic bone, thereby improving the fit in this part.

Moreover, the part 11 cmin which has the narrowest width in the left-right direction of the absorptive core material 11 is connected in an up-down direction, and is provided above the lower end 32ed of the center low basis weight area 32. As mentioned above, the center low basis weight area|region 32 has the function of the bending induction area|region which becomes the starting point of convex deformation of the center part of the absorptive core material 11 in the left-right direction. That is, when the disposable diaper 1 is worn, the absorptive core material 11 is deformed in a state of being deformed into a convex shape toward the skin side in a region lower than the lower end 32ed of the central low basis weight region 32 . Therefore, when a portion 11 cm is provided on the lower side than the lower end 32 ed of the central low basis weight region 32 , the force for convexly deforming the absorbent core 11 in the vertical direction at the portion 11 cm is adapted to the shape of the wearer's body. Then, the forces that deform the absorptive main body 11 upright from the crotch portion to the lower abdomen interfere with each other, and there is a possibility that the absorptive core material 11 cannot be properly deformed. Therefore, in the present embodiment, the portion 11cmin is provided above the lower end 32ed of the central low basis weight region 32, and the force acting at the position of the portion 11cmin and the force acting at the position of the lower end 32ed do not interfere with each other. Thereby, the absorptive core material 11 can be easily deformed appropriately.

As mentioned above, although the embodiment concerning this invention was described, the said embodiment is an embodiment which is easy to understand this invention, and is not intended to limit this invention. In addition, the present invention can be changed, improved, and the like without departing from the scope of the technical idea, and it is a matter of course that the present invention also includes the equivalents thereof.

1‧‧‧Pants-type disposable diapers (disposable diapers, shorts-type absorbent articles) 1a‧‧‧Waist opening 1b‧‧‧Opening at the foot 10‧‧‧Absorptive body 10F‧‧‧Front side 10R‧‧‧Rear side 11‧‧‧Absorptive core material 11A‧‧‧Lower abdomen 11B‧‧‧crotch 11C‧‧‧Buttocks 11c‧‧‧Reduced diameter 11t‧‧‧Protrusion 12‧‧‧Top Sheet 13‧‧‧Back Sheet 14‧‧‧Side sheet 20‧‧‧Exterior components 21‧‧‧Front belt part (abdominal side exterior member) 21s‧‧‧Front telescopic area 211‧‧‧Waist area 212‧‧‧crotch side area 212s‧‧‧Slope 213‧‧‧Skin side sheet 214‧‧‧Non-skin side sheet 215‧‧‧Stretchable non-woven fabric 22‧‧‧Rear belt part (back side exterior member) 22s‧‧‧Rear telescopic area 221‧‧‧Waist area 222‧‧‧crotch side area 223‧‧‧Skin side sheet 224‧‧‧Non-skin side sheet 225‧‧‧Stretchable non-woven fabric 23‧‧‧crotch member (crotch outer member) 23s‧‧‧crotch stretch area 231‧‧‧Skin side sheet 232‧‧‧Non-skin side sheet 233‧‧‧Stretchable non-woven fabric 24‧‧‧End joint area 25a, 25b‧‧‧welding part 26‧‧‧Waist elastic element 27‧‧‧Elastic member of foot circumference 28‧‧‧Crotch elastic member 31‧‧‧Sloping low basis weight areas 31eu‧‧‧Top 31ed‧‧‧Bottom 311‧‧‧First inclined low basis weight area 311eu‧‧‧Top 311ed‧‧‧Bottom 312‧‧‧Second inclined low basis weight area 312eu‧‧‧Top 312ed‧‧‧Bottom 32‧‧‧Central low basis weight area 32eu‧‧‧Top 32ed‧‧‧Bottom 33‧‧‧Central low basis weight area 341‧‧‧Low basis weight area on the 1st upper side 341ed‧‧‧Bottom 342‧‧‧Second upper low basis weight area 342ed‧‧‧Bottom 351‧‧‧Lower basis weight area 1st 351eu‧‧‧Top 40‧‧‧Leak-proof wall 41‧‧‧Elastic member of leak-proof wall 42‧‧‧Elastic member of leak-proof wall CL‧‧‧Reserved location

FIG. 1 is a perspective view of the disposable disposable diaper 1 of the pant type. Fig. 2 is a schematic plan view of the paper diaper 1 in an unfolded and extended state viewed from the non-skin side. Fig. 3 is a schematic cross-sectional view taken along the line I-I in Fig. 2 . 4A is a schematic plan view of the absorptive main body 10 in the unfolded and stretched state viewed from the skin side. FIG. 4B is a cross-sectional view taken along the line A-A of FIG. 4A . FIG. 5 is a schematic plan view of the paper diaper 1 in an unfolded and extended state, and is a diagram illustrating the positional relationship between various stretchable regions (21s, 22s, 23s) and the absorbent core 11. FIG. Fig. 6 is a plan view of the absorptive core material 11 viewed from the skin side. FIG. 7 is a schematic perspective view illustrating deformation of the absorbent core 11 when the paper diaper 1 is worn. FIG. 8 is a schematic cross-sectional view illustrating a state in which the absorptive core material 11 is lifted from the wearer's body (skin). FIG. 9 is a schematic cross-sectional view illustrating a case where the contraction force in the left-right direction of the front-side expansion-contraction region 21s acts on the absorptive core 11 in FIG. 8 .

1‧‧‧Pants-type disposable diapers (disposable diapers, shorts-type absorbent articles)

10F‧‧‧Front side

10R‧‧‧Rear side

11‧‧‧Absorptive core material

11A‧‧‧Lower abdomen

11B‧‧‧crotch

11C‧‧‧Buttocks

21‧‧‧Front belt part (abdominal side exterior member)

21s‧‧‧Front telescopic area

22‧‧‧Rear belt part (back side exterior member)

22s‧‧‧Rear telescopic area

23‧‧‧crotch member (crotch outer member)

23s‧‧‧crotch stretch area

24‧‧‧End joint area

26‧‧‧Waist elastic element

27‧‧‧Elastic member of foot circumference

28‧‧‧Crotch elastic member

31‧‧‧Sloping low basis weight areas

32‧‧‧Central low basis weight area

33‧‧‧Central low basis weight area

215‧‧‧Stretchable non-woven fabric

225‧‧‧Stretchable non-woven fabric

231‧‧‧Skin side sheet

CL‧‧‧Reserved location

Claims (15)

An underpants-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction that intersect with each other, and comprising: an absorptive main body including an absorptive core material arranged along the up-down direction, at a lower end of the up-down direction The front side belt part is joined to the front side upper end of the absorptive body and has a front side expansion and contraction area in the left and right direction, characterized in that the absorptive core material has a front side expansion and contraction area in the front and rear direction. The front side part of the folded part of the front side, the absorptive core material is attached to the front side part, and has a region inclined from the upper side in the vertical direction to the lower side and from the outer side in the left-right direction toward the center side and has a larger basis weight than the surrounding area. The lower one pair of inclined low basis weight regions, the entirety of the pair of inclined low basis weight regions and the front side expansion and contraction regions are overlapped. The pants-type absorbent article according to claim 1, wherein the front side portion is provided with the absorbent core material along the up-down direction between the left-right directions of the pair of inclined low basis weight regions. Through the central low basis weight area. The pants-type absorbent article according to claim 2, wherein the width in the short-side direction of the central low basis weight region is larger than that of the pair of The width in the short-side direction of each of the inclined low basis weight regions is wide. The pants-type absorbent article of claim 2 or 3, wherein the lower ends of the pair of inclined low basis weight regions are positioned higher in the vertical direction than the lower ends of the central low basis weight region. The pants-type absorbent article of claim 2, wherein, in the vertical direction, the upper ends of the pair of inclined low basis weight regions are positioned higher than the upper ends of the central low basis weight region. The underpants-type absorbent article of claim 1, further comprising a rear-side belt portion joined to the rear-side upper end portion of the absorbent body and having a rear-side expansion-contraction region that expands and contracts in the left-right direction, wherein the In the left-right direction, there is an end joint region that joins both ends of the front belt portion and both ends of the rear belt portion, and the lower end edge of the front belt portion has a lower end of the end joint region toward the crotch. A sloped portion that slopes obliquely. The pants-type absorbent article according to claim 6, wherein a smaller angle among the angles formed by the inclined portion and the up-down direction is smaller than the angle formed by the inclined low basis weight region and the up-down direction. Smaller angles are larger. The underpants-type absorbent article according to claim 6 or 7, further comprising a foot-circumferential elastic member that expands and contracts along the inclined portion, a region for generating the stretchability of the foot-circumference elastic member, and the absorbent core material system Not repeated. The underpants-type absorbent article of claim 1, wherein the absorbent core is on the front side portion, and has a diameter-reduced portion whose width in the left-right direction is narrowed, and the diameter-reduced portion is in the left-right direction. The narrowest part of the width is repeated with the aforementioned front expansion area. The pants-type absorbent article of claim 9, wherein the front side portion is provided with the absorbent core material along the vertical direction between the left-right direction of the pair of inclined low basis weight regions. In the through central low basis weight region, in the vertical direction, the position of the narrowest part in the left and right direction of the diameter-reduced portion is higher than the position of the lower end of the central low basis weight region. The pants-type absorbent article of claim 1, wherein the pair of inclined low basis weight regions comprises: a pair of first inclined low basis weight regions; and A pair of 2nd inclined low basis weight area|regions provided in the area|region inside the said left-right direction of the said pair of said 1st inclined low basis weight area. The pants-type absorbent article of claim 11, wherein the length in the longitudinal direction of the pair of second inclined low basis weight regions is shorter than the length in the longitudinal direction of the pair of first inclined low basis weight regions . The pants-type absorbent article according to claim 11 or 12, wherein, in the vertical direction, the position of the lower ends of the pair of second inclined low basis weight regions is higher than the position of the lower ends of the pair of first inclined low basis weight regions. The position of the lower end is high. The underpants-type absorbent article of claim 11, wherein the absorbent core is on the front side portion, and has a first upper low basis weight region along the up-down direction whose basis weight is lower than the surrounding region. And along the above-mentioned up-down direction, the 1st lower side low basis weight area with the basis weight lower than the surrounding area, the lower end of the aforesaid 1st upper side low basis weight area is connected with the upper end of the 1st inclined low basis weight area, the aforesaid first 1. The lower end of the inclined low basis weight region is connected to the upper end of the first lower low basis weight region. The underpants-type absorbent article of claim 11, wherein the absorbent core material is attached to the front side portion, and has a second upper low basis weight region along the up-down direction whose basis weight is lower than that of the surrounding region. ; and the lower end of the second upper low basis weight region is connected to the upper end of the second inclined low basis weight region.

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