CN111374834A - Absorbent body for absorbent article and absorbent article - Google Patents

Abstract

Provided are an absorbent body for an absorbent article and an absorbent article, which are excellent in fit, wearability and absorbency. An absorbent (14) comprising an intermediate layer (43) and an absorbent core (47) comprising a super absorbent polymer in the thickness direction (T), wherein the absorbent is divided in the width direction (W) in the crotch region (MA) into an absorbent core overlapping region (C2) overlapping the absorbent core in the thickness direction_OP) And a pair of absorbent core non-overlapping regions (C2) which do not overlap the absorbent core in the thickness direction and are disposed at both ends of the absorbent core overlapping region_NP) The intermediate layer has an intermediate layer overlapping portion (43) arranged in the crotch region in the region where the absorbent core overlaps_OP) And a pair of middle layer non-overlapping parts (43) arranged in the pair of absorbent core non-overlapping areas_NP) In the crotch region, the average weight per unit area or thickness of each of the non-overlapping portions of the pair of intermediate layers is larger than the average weight per unit area or thickness of the overlapping portion of the intermediate layersThe thickness is small.

Description

Absorbent body for absorbent article and absorbent article

Technical Field

The present disclosure relates to an absorbent body for an absorbent article and an absorbent article.

Background

An absorbent body for an absorbent article is known, which includes a1 st absorbent layer containing a super absorbent polymer, a2 nd absorbent layer containing a super absorbent polymer, and a fabric layer disposed between the 1 st absorbent layer and the 2 nd absorbent layer.

For example, patent document 1 describes a water-absorbent sheet having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched between hydrophilic nonwoven fabrics, wherein the water-absorbent sheet has the following structure: the absorptive layer is divided into 1 times absorptive layer and 2 times absorptive layer by a base material layer, the base material layer is formed by bonding and laminating more than two layers of base materials with air permeability by using bonding agents, the base material layer satisfies the following conditions (1) to (2), (1) the basis weight of the base material layer is 25g/m²And (2) utilizing 0.1g/m between the substrates having air permeability²～50g/m²The amount of the adhesive is the same as the amount of the adhesive.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2010/143635 pamphlet

Disclosure of Invention

Problems to be solved by the invention

In the water-absorbent sheet (absorbent body) described in patent document 1, the base layer has (i) a function of temporarily storing the liquid that has reached the water-absorbent sheet (absorbent body) due to a deterioration in the absorption rate of the liquid by the water-absorbent resin (superabsorbent polymer) (temporary storage function), and (ii) a function of suppressing a decrease in the absorption of the water-absorbent sheet (absorbent body) or an absorbent article including the water-absorbent sheet due to the tendency of the water-absorbent resin (superabsorbent polymer) to clump together.

On the other hand, in order to improve the temporary storage function of the water-absorbent sheet (absorbent body), the thickness (basis weight) of the base material layer is preferably large, but this tends to make the water-absorbent sheet (absorbent body) or an absorbent article including the water-absorbent sheet hard, makes it difficult to deform the absorbent article along the body shape of the wearer, tends to deteriorate the fit, and tends to deteriorate the wearability.

Further, if the thickness (basis weight) of the base material layer is increased, the base material layer temporarily stores liquid, and it is difficult to transfer the temporarily stored liquid to the primary absorbent layer and the 2-time absorbent layer, and the absorbent body tends to be deteriorated in absorbency.

Accordingly, an object of the present disclosure is to provide an absorbent body excellent in fit, wearability, and absorbency.

Means for solving the problems

The present inventors have proposed an absorber for an absorbent article, the absorber having a longitudinal direction, a width direction, and a thickness direction, and further having a longitudinal direction center line and a crotch region, wherein the absorber includes an intermediate layer and an absorbent core containing a super absorbent polymer in the thickness direction, the absorber is divided in the crotch region in the width direction into an absorbent core overlapping region overlapping with the absorbent core in the thickness direction and a pair of absorbent core non-overlapping regions not overlapping with the absorbent core in the thickness direction and disposed at both ends of the absorbent core overlapping region, the intermediate layer includes an intermediate layer overlapping portion disposed in the absorbent core overlapping region and a pair of intermediate layer non-overlapping portions disposed in the pair of absorbent core non-overlapping regions in the crotch region, in the crotch region, the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion, or the thickness of each of the pair of intermediate layer non-overlapping portions is smaller than the thickness of the intermediate layer overlapping portion.

ADVANTAGEOUS EFFECTS OF INVENTION

The absorbent body of the present disclosure is excellent in adhesiveness, wearability, and absorbency.

Drawings

Fig. 1 is a front view of a pants-type diaper 1 of embodiment 1 in an unfolded state.

Fig. 2 is a rear view of the pants-type diaper 1 in an unfolded state.

Fig. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of fig. 1.

Fig. 4 is a cross-sectional view of the absorbent body 14 taken along the line III-III in fig. 1.

Fig. 5 is a diagram for explaining the absorbent body 14.

Fig. 6 is a diagram for explaining the absorbent body 14.

Fig. 7 is a diagram for explaining the pants-type diaper according to embodiment 2.

Description of the reference numerals

1: pants-type diaper, 2: ventral portion (ventral waistband), 3: dorsal part (dorsal waistband), 4: crotch portion, 5a, 5 b: cover sheet, 10: absorbent main body, 12: liquid-permeable sheet, 13: liquid-impermeable sheet, 14: absorber, 41: 1 st absorption layer, 42: 2 nd absorption layer, 43: intermediate layer, 43_OP: intermediate layer overlap, 43_NP: intermediate layer non-overlapping portion, 43S: intermediate sheet, 43 a: 1 st piece portion, 43 b: sheet 2 portion, 43 c: sheet 3 portion, 44: 1 st substrate, 45: 1 st water absorbent material, 46: 2 nd substrate, 47: no. 2 water-absorbing material, 48: channel, 61: elastic member, 101: void, 103, 104, 105, 106: folding axis, 107: display unit, L: length direction, W: width direction, T: thickness direction, CL: longitudinal centerline, CW: width-direction center line, BA: back area, FA: ventral region, MA: crotch region, C1_OP: 1 st absorbent core overlap region, C1_NP: 1 st absorbent core non-overlapping area, C2_OP: 2 nd absorbent core overlap region, C2_NP: no. 2 absorbent core non-overlapping area, LB: low basis weight region.

Detailed Description

Specifically, the present disclosure relates to the following technical solutions.

[ solution 1]

An absorbent body for an absorbent article, having a longitudinal direction, a width direction, and a thickness direction, and having a longitudinal centerline and a crotch region,

the absorbent body is provided with an intermediate layer and an absorbent core containing a super absorbent polymer in the thickness direction,

the absorber is divided in the crotch region in the width direction into an absorbent core overlapping region overlapping with the absorbent core in the thickness direction and a pair of absorbent core non-overlapping regions not overlapping with the absorbent core in the thickness direction and disposed at both ends of the absorbent core overlapping region,

the intermediate layer includes an intermediate layer overlapping portion disposed in the absorbent core overlapping region and a pair of intermediate layer non-overlapping portions disposed in the pair of absorbent core non-overlapping regions in the crotch region,

in the crotch region, the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion, or the thickness of each of the pair of intermediate layer non-overlapping portions is smaller than the thickness of the intermediate layer overlapping portion.

It is also considered that the end edges of the absorbent core in the width direction of the absorbent body (i.e., the boundaries between the absorbent core overlapping regions and the absorbent core non-overlapping regions) are originally likely to become starting points for deformation guidance. However, an absorbent material having a high proportion of superabsorbent polymer tends to have a low basis weight and stiffness of the absorbent material, and the edges of the absorbent core in the width direction of the absorbent material (i.e., the boundaries between the absorbent core overlapping regions and the absorbent core non-overlapping regions) tend to be less likely to serve as starting points for deformation guidance, as compared to conventional absorbent materials comprising pulp fibers and superabsorbent polymer.

In the absorbent article, when the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion in the crotch region, the difference between the rigidity of the absorbent core overlapping region of the absorbent body and the rigidity of each of the pair of absorbent core non-overlapping regions of the absorbent body is large, and the end edge of the absorbent core in the width direction of the absorbent body (i.e., the boundary between the absorbent core overlapping region and the absorbent core non-overlapping region) is likely to become a starting point for the deformation guide.

Therefore, when a wearer wears an absorbent article including the absorbent body, the boundary between the absorbent core overlapping region of the absorbent body and the absorbent core non-overlapping region of the absorbent body functions as a deformation guide, and the absorbent article including the absorbent body can be attached to the body of the wearer, so that the absorbent body has excellent fit.

Further, after the absorbent article is worn and before the absorbent body absorbs liquid, the relatively high average basis weight overlapped portion of the intermediate layer can make the wearer less likely to feel the hardness of the super absorbent polymer, and the relatively low average basis weight non-overlapped portion of the intermediate layer can make the wearer's legs feel soft, and the absorbent body is excellent in wearing feeling.

Further, after the absorbent body has absorbed liquid, the overlapped portion of the intermediate layer having a relatively high average basis weight can temporarily store more liquid and transfer the temporarily stored liquid to the super absorbent polymer of the adjacent absorbent core, and therefore, the absorbent body is excellent in absorbency.

In the absorbent article, in the crotch region, when the thickness of each of the pair of intermediate layer non-overlapping regions is smaller than the thickness of the intermediate layer overlapping region, the difference between the thickness of the absorbent core overlapping region of the absorbent body and the thickness of each of the pair of absorbent core non-overlapping regions of the absorbent body is large, and the end edge of the absorbent core in the width direction of the absorbent body (i.e., the boundary between the absorbent core overlapping region and the absorbent core non-overlapping region) is likely to become the starting point of the deformation guide, as in the case of the average basis weight.

Further, the relatively thick overlapping portion of the intermediate layer can make the wearer less likely to feel the hardness of the super absorbent polymer after wearing the absorbent article and before the absorbent body absorbs liquid, and the relatively thin non-overlapping portion of the intermediate layer can make the wearer's legs feel soft, and the absorbent body is excellent in wearing feeling.

Further, after the absorbent body has absorbed liquid, the overlapping portion of the intermediate layer having a relatively large thickness can temporarily store more liquid and transfer the temporarily stored liquid to the super absorbent polymer of the adjacent absorbent core, so that the absorbent body is excellent in absorbency.

[ solution 2]

The absorbent according to claim 1, wherein an average weight per unit area of the non-overlapping portion of the intermediate layer is smaller than an average weight per unit area of the overlapping portion of the intermediate layer in the crotch region.

The absorbent body described above has the same effect as the "case where the average basis weight of each of the pair of intermediate layer non-overlapping portions of the intermediate layer is smaller than the average basis weight of the intermediate layer overlapping portion in the crotch region" in claim 1.

[ solution 3]

The absorbent body according to claim 1 or 2, wherein the intermediate layer overlapping portion is formed by an integral intermediate sheet that is folded, and includes a plurality of sheet portions.

In the absorbent body, the intermediate layer-overlapping portion is formed by a single intermediate sheet being folded, and therefore the absorbent body is excellent in wearing feeling.

[ solution 4]

The absorbent body according to claim 3, wherein the plurality of sheet portions are not joined to each other.

In the above-described absorbent body, the plurality of sheet portions are not joined to each other, and therefore in the case where the super absorbent polymer in the absorbent body absorbs liquid, particularly, absorbs liquid many times, and the absorbent core is intended to swell in the thickness direction, the plurality of sheet portions are separated by the restoring force of the folded intermediate sheet, and a space can be formed therebetween. Next, when the absorbent body repeatedly absorbs liquid, the absorbent core can swell toward the void portion, and therefore swelling of the absorbent core is not easily hindered. Therefore, the absorbent body is excellent in absorbency, particularly repeated absorbency.

[ solution 5]

The absorbent body according to claim 3 or 4, wherein the intermediate layer comprises a1 st sheet portion, a pair of 2 nd sheet portions, and a pair of 3 rd sheet portions,

the 1 st sheet portion is disposed in the absorbent core overlapping region across the longitudinal centerline,

the pair of 2 nd sheet portions are disposed closer to the longitudinal center line than the both ends in the width direction of the 1 st sheet portion and do not contact the longitudinal center line,

the pair of 3 rd sheet parts are further disposed in the absorbent core non-overlapping region so as to be apart from the longitudinal centerline from both ends of the pair of 2 nd sheet parts close to the longitudinal centerline.

In the absorbent body, the intermediate layer has a predetermined structure (hereinafter, sometimes referred to as "Ω structure"), and therefore the absorbent body is excellent in wearing feeling.

[ solution 6]

The absorbent body according to claim 5, wherein the pair of 3 rd sheet portions are disposed on the absorbent core side of the 1 st sheet portion.

In the absorbent body, the intermediate layer has an omega-configuration, and the pair of 3 rd sheet portions are disposed on the absorbent core side of the 1 st sheet portion. Therefore, when the portion of the absorbent core including the longitudinal center line (hereinafter referred to as "central portion in the width direction") absorbs liquid and the central portion in the width direction of the absorbent core swells in the thickness direction, the 1 st sheet portion swells accompanying this, and the 1 st sheet portion is separated from the 2 nd sheet portion and the 3 rd sheet portion, and a space can be formed therebetween. Next, when the absorbent body repeatedly absorbs liquid and the liquid reaches a portion of the absorbent core adjacent to the widthwise central portion (hereinafter referred to as "widthwise adjacent portion"), the widthwise adjacent portion of the absorbent core can swell toward the void, and therefore the liquid absorbency of the absorbent article is not easily hindered. As described above, the absorbent body is excellent in repeated absorbability.

[ solution 7]

The absorbent body according to any one of claims 1 to 6, wherein the intermediate layer is disposed on the skin side, the absorbent core is disposed on the garment side, and the absorbent body further comprises an additional absorbent core comprising a super absorbent polymer on the skin side of the intermediate layer.

The absorbent body has the same effects as those of claim 1. In addition, in the case where claim 7 is appended to claim 4, since the absorbent body includes two absorbent cores (the absorbent core and the additional absorbent core) so as to sandwich the intermediate layer therebetween, the two absorbent cores can expand toward the space formed between the two absorbent cores (the absorbent core and the additional absorbent core), and therefore the absorption of liquid by the absorbent body is not easily hindered, and the liquid absorption performance is excellent. As described above, the absorbent body is excellent in repeated absorbability.

[ solution 8]

The absorbent body according to claim 7, wherein the supplemental absorbent core is provided with a channel at a position overlapping the longitudinal centerline in the thickness direction in the crotch region.

In the absorbent body, the additional absorbent core includes the channel at a position overlapping the longitudinal center line in the thickness direction of the absorbent body, and therefore the absorbent body or the absorbent article can be guided along the channel in a deformed manner. Therefore, the absorbent body has excellent adhesiveness.

[ solution 9]

The absorber according to any one of claims 1 to 8, wherein the absorber includes a low basis weight region having a smaller basis weight than the surrounding region at a position in the crotch region that overlaps with the longitudinal centerline in the thickness direction.

Since the absorber has a predetermined low basis weight region in the crotch region, the absorber has low rigidity at the longitudinal center line, and the longitudinal center line is likely to serve as a starting point for deformation guidance. Therefore, when the wearer wears the absorbent article including the absorbent body, the deformation guide can be performed, for example, so as to be away from the wearer or so as to be closer to the wearer at the longitudinal centerline of the absorbent body. Therefore, the absorbent body has excellent adhesiveness.

[ solution 10]

The absorber according to claim 9, wherein the absorber includes a display portion at a position overlapping the low basis weight region in the thickness direction.

Since the absorbent body includes the display portion at a position overlapping the low basis weight region in the thickness direction of the absorbent body, the liquid that has reached the absorbent body can quickly reach the display portion, and therefore, it is not easy for the user to miss the timing to replace the absorbent article.

[ solution 11]

An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet,

the absorber is the absorber described in any one of claims 1 to 10.

The absorbent article described above has the same effects as in claim 1.

[ solution 12]

The absorbent article according to claim 11, wherein the absorber includes a low basis weight region having a smaller basis weight than the surrounding region at a position in the crotch region that overlaps the longitudinal centerline in the thickness direction,

the absorbent article includes a display portion at a position overlapping the low basis weight region in the thickness direction.

Since the absorbent article includes the display portion at a position overlapping the low basis weight region of the absorbent body in the thickness direction of the absorbent body, the liquid that has reached the absorbent body can quickly reach the display portion, and therefore the user is less likely to miss the timing to replace the absorbent article.

[ solution 13]

The absorbent article according to claim 12, wherein the display portion is disposed between the liquid-permeable sheet and the absorbent body or between the absorbent body and the liquid-impermeable sheet.

In the absorbent article, since the display portion is disposed at a predetermined position, the liquid can quickly reach the display portion, the display portion can quickly respond, and the display portion is excellent in visibility.

Hereinafter, the absorbent body for an absorbent article of the present disclosure (hereinafter, sometimes referred to as "the absorbent body of the present disclosure") and the absorbent article will be described in detail. For the sake of simplifying the description, the absorbent body is also described in the embodiment of the absorbent article.

Fig. 1 to 6 are views for explaining an absorbent article, specifically, a pants-type diaper 1 according to one embodiment of the present disclosure (hereinafter, referred to as embodiment 1). Specifically, fig. 1 and 2 are a front view and a rear view of the pants-type diaper 1 in an unfolded state, respectively. Fig. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of fig. 1. Fig. 4 is a cross-sectional view of the absorbent body 14 taken along the line III-III in fig. 1. Fig. 5 is a view for explaining the absorbent body 14, fig. 5 (a) is a plan view, and fig. 5 (b) is a cross-sectional view taken along line Vb-Vb in fig. 5 (a). Fig. 6 is a diagram for explaining a mechanism of the absorption body 14 absorbing liquid. The drawings are schematic, and particularly, in fig. 3 to 6, the thickness in the thickness direction T is drawn thicker than the actual thickness for the convenience of understanding.

The pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side away from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively.

The side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the abdomen (end edge on the abdomen side) in the longitudinal direction L is also referred to as the front side in the longitudinal direction L, and the side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the back (end edge on the back side) is also referred to as the back side in the longitudinal direction L.

The "plan view" refers to the pants-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view.

The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L.

The "skin side" and the "non-skin side" refer to a side relatively close to the skin surface of the wearer and a side far from the skin surface of the wearer in the thickness direction T, respectively, in a case where the pants-type diaper 1 is worn on the wearer.

These definitions apply not only to the pants-type diaper 1 but also to the absorber of the pants-type diaper 1 and the respective materials disposed thereon.

The member, structure, shape, and the like (hereinafter referred to as "member and the like") extend along the longitudinal direction L, and include not only a case where the member and the like are parallel to the longitudinal direction L but also a case where the component Dx of the member and the like in the longitudinal direction L is larger than the component Dy of the member and the like in the width direction W (Dx > Dy). Similarly, the member or the like extends in the width direction W, and includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a member or the like having a shape such as a curve or a curved surface (hereinafter referred to as "curve or the like"), the member or the like is evaluated as described above with respect to a tangent line at each point on the curve or the like.

As shown in fig. 1 and 2, the pants-type diaper 1 has a plane direction P and a thickness direction T that are orthogonal to each other, and the plane direction P includes a longitudinal direction L and a width direction W of the pants-type diaper 1.

The pants-type diaper 1 includes a stomach-side portion (stomach-side waistband) 2, a back-side portion (back-side waistband) 3, and an absorbent main body 10 positioned between the stomach-side portion 2 and the back-side portion 3 in the longitudinal direction L. In embodiment 1, the pants-type diaper 1 further includes a crotch portion 4 located between the abdomen-side portion 2 and the back-side portion 3. The abdomen portion 2 is a portion that abuts against the abdomen of the wearer. The back portion 3 is a portion that abuts against the hip or the back of the wearer. The absorbent body 10 is a portion that comes into contact with the crotch of the wearer, and has one end portion in the longitudinal direction L stacked on the stomach-side portion 2 and the other end portion stacked on the back-side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side.

The pants-type diaper 1 is formed by joining both end portions 2a, 2a in the width direction W of the abdomen-side portion 2 and both end portions 3a, 3a in the width direction W of the back-side portion 3 along the longitudinal direction L. In the pants-type diaper 1, a waist opening through which the waist of the wearer passes is defined by an outer end 2e of the stomach-side portion 2 in the longitudinal direction L and an outer end 3e of the back-side portion 3 in the longitudinal direction L. In the pants-type diaper 1, a pair of leg openings through which the legs of the wearer pass are defined by the side portions 5e, 5e on both sides in the width direction W of the crotch portion 4. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 can be said to be defined by the range of the longitudinal direction L in which the both end portions 2a, 2a and the both end portions 3a, 3a are joined.

In embodiment 1, in the state shown in fig. 1 and 2, each of the ventral portion 2 and the dorsal portion 3 has a rectangular shape that expands substantially in the width direction W and is separated from each other in the longitudinal direction L. The crotch portion 4 is located between the stomach portion 2 and the back portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are integrally formed with each other. In another embodiment (not shown), the stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are formed independently of each other. In another embodiment (not shown), the pants-type diaper 1 includes a front side portion 2 and a back side portion 3, and does not include a crotch portion 4.

In embodiment 1, the stomach portion 2, the back portion 3, and the crotch portion 4 are provided with liquid-impermeable cover sheets (sheet members) 5. The cover sheet 5 includes a cover sheet 5a on the skin side and a cover sheet 5b on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and bonded to each other with an adhesive or the like. Both ends in the longitudinal direction L of the covering sheet 5b are folded back toward the skin side so as to cover both ends in the longitudinal direction L of the covering sheet 5 a. The portion of the cover sheet 5b at the folded position of the abdomen portion 2 constitutes the end portion 2e of the abdomen portion 2, and the portion of the cover sheet 5b at the folded position of the back portion 3 constitutes the end portion 3e of the back portion 3.

In embodiment 1, the abdomen-side portion 2 is provided with a plurality of elastic members 6a, 6b for waist gather between the covering sheet 5a and the covering sheet 5b, and the back-side portion 3 is provided with a plurality of elastic members 7a, 7b for waist gather between the covering sheet 5a and the covering sheet 5 b. The plurality of elastic members 6a and 6b are disposed inside and outside the abdominal portion 2 in the longitudinal direction L. The plurality of elastic members 6a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals. The predetermined region is a region from the end portion 2a to a portion inside the end edge facing in the width direction W of the absorbent main body 10. The plurality of elastic members 6b extend from the one end portion 2a to the other end portion 2a in the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of elastic members 7a and 7b are disposed inside and outside the back portion 3 in the longitudinal direction L.

The plurality of elastic members 7a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals from each other. The predetermined region is a region from the end portion 3a to a portion inside the end edge facing in the width direction W of the absorbent main body 10. The plurality of elastic members 7b extend from the one end portion 3a to the other end portion 3a in the width direction W and are arranged at intervals in the longitudinal direction L. The plurality of elastic members 6a, 6b, 7a, and 7b are for extending and contracting the waist opening, and are exemplified by rubber bands. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 may be defined by a range in the longitudinal direction L in which the plurality of elastic members 6a, 6b, 7a, 7b are arranged.

In embodiment 1, the pants-type diaper 1 includes a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the stomach portion 2. The plurality of elastic members 8 are provided extending in the longitudinal direction L mainly at both ends in the width direction W of the crotch portion 4. The plurality of elastic members 8 are for expanding and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.

In embodiment 1, the absorbent body 10 has a substantially rectangular shape, and includes a liquid-permeable sheet 12, a liquid-impermeable sheet 13, and an absorbent body 14 disposed between the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 and absorbing and retaining liquid such as urine. Examples of the liquid-permeable sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the liquid-impermeable sheet 13 include liquid-impermeable nonwoven fabrics, synthetic resin films, and composite sheets thereof, such as SMS nonwoven fabrics.

In embodiment 1, the absorbent body 14 includes an absorbent core for absorbing and retaining liquid and a core cladding that encloses the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the liquid-permeable sheet 12, and the liquid-impermeable sheet 13 are bonded together with an adhesive, and the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 are bonded together with an adhesive at their peripheral edge portions. Examples of the adhesive include materials known in pants-type diapers, for example, a hot melt adhesive. The shape of the absorbent main body 10 is not limited to the above examples as long as it is long in the longitudinal direction L, and examples thereof include a rectangular shape with rounded corners, a rectangular shape with a short side being a curve protruding outward, and an hourglass shape. In another embodiment, the liquid-impermeable sheet 13 is omitted, and the non-skin side surface of the absorbent body 14 and the non-skin side surface of the peripheral edge portion of the liquid-permeable sheet 12 are joined to the cover sheet 5.

In embodiment 1, the skin-side surface of the absorbent main body 10 includes a pair of side sheets 17, 17 located on both sides in the width direction W and extending in the longitudinal direction L. Each side sheet 17 has a leakage preventing wall 16 and fastening regions 15, 15. The fastening regions 15, 15 are positioned at the front and rear ends of the side sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbent main body 10. The leakage preventing wall 16 is located between the front and rear fastening regions 15, 15 in the longitudinal direction L of the side sheet 17, is adjacent to them, and fastens the outer end edge in the width direction W to the skin-side surface of the absorbent main body 10, and fastens the inner end edge in the width direction W. The leakage preventing walls 16 and the fastening regions 15, 15 are formed by, for example, inner portions of the side sheets 17 in the width direction W, and outer portions of the side sheets 17 in the width direction W are fastened to the absorbent main body 10.

The pair of leakage preventing walls 16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbent main body 10, and extend continuously along the longitudinal direction L. Each of the leakage preventing walls 16 includes two elastic members 61 extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 is exemplified as a rubber band. The pair of leakage preventing walls 16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, the pair of leakage preventing walls 16, 16 are each formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.

Next, the absorbent body 14 will be described with reference to fig. 1 to 5. The absorber 14 includes a1 st absorbent layer 41 disposed on the skin side, a2 nd absorbent layer 42 disposed on the non-skin side, and an intermediate layer 43 disposed between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. The absorbent body 14 has a substantially rectangular planar shape extending in the longitudinal direction L.

In embodiment 1, the 1 st absorbent layer 41 includes a1 st base 44 formed of a liquid-permeable sheet and a1 st absorbent material 45 having a water-absorbent material containing a water-absorbent polymer and disposed on the intermediate layer 43 side of the 1 st base 44. The 1 st absorbent layer 41 can be viewed as having the 1 st absorbent material 45 as the absorbent core portion, and the 1 st substrate 44 (and intermediate layer 43) as the core cladding. The 1 st water absorbent material 45 is fixed to at least one of the 1 st base material 44 and the intermediate layer 43 by an adhesive applied to at least one of the surface of the 1 st base material 44 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 1 st base material 44 side.

The water absorbent material of the 1 st water absorbent material 45 is disposed in the 1 st absorbent layer 41 with a substantially uniform basis weight except at the channels 48. The 1 st water absorbing material 45 has a substantially rectangular planar shape. The 1 st base material 44 has a substantially rectangular planar shape, and covers the 1 st absorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1 st base material 44 extends slightly outward from the periphery of the 1 st absorbent material 45. The passage 48 will be described later.

In embodiment 1, the 2 nd absorbent layer 42 includes a2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a2 nd water-absorbent material 47 having a water-absorbent material containing a water-absorbent polymer and disposed at a position closer to the intermediate layer 43 than the 2 nd base 46. The 2 nd absorbent layer 42 can be viewed as having the 2 nd water absorbent material 47 as the absorbent core portion and the 2 nd base material 46 (and intermediate layer 43) as the core cladding. The 2 nd water absorbing material 47 is fixed to at least one of the 2 nd base material 46 and the intermediate layer 43 with an adhesive applied to at least one of the surface of the 2 nd base material 46 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 2 nd base material 46 side. The 2 nd water absorbent material 47 is disposed in the 2 nd absorbent layer 42 with a substantially uniform basis weight.

The 2 nd water absorbent material 47 has a substantially rectangular planar shape having the same width as the 1 st water absorbent material 45 in the width direction W. The 2 nd base material 46 has a substantially rectangular planar shape, and covers the 2 nd absorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2 nd base material 46 extends slightly outward from the periphery of the 2 nd absorbent material 47. Both ends of the 2 nd base material 46 in the width direction W cover both side surfaces of the 2 nd absorbent 47, and cover the skin-side surfaces of both ends of the 1 st base material 44 in the width direction W. That is, on the skin-side surface of the end portion in the width direction W of the 1 st absorbent layer 41, the end portion in the width direction W of the 2 nd base material 46 and the end portion in the width direction W of the 1 st base material 44 are overlapped and joined.

Both ends of the 1 st base 44 in the width direction W cover the side surfaces of the 1 st absorbent 45 in the width direction W and also cover the side surfaces of the 2 nd base 46 in the width direction W, whereby the 1 st absorbent 45 is enclosed in the 1 st absorbent layer 41 in the width direction W and the 2 nd absorbent 47 is enclosed in the 2 nd absorbent layer 42 in the width direction W.

In embodiment 1, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorbent body 14. Thus, the 1 st water absorbent material 45 is enclosed in the 1 st absorbent layer 41 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 2 nd water absorbent material 47 is enclosed in the 2 nd absorbent layer 42 by the 2 nd base material 46 and the intermediate layer 43 in the longitudinal direction L.

An absorbent body 14 inA2 nd absorbent core overlapping region C2 divided in the width direction W so as to overlap with the 2 nd absorbent material 47 in the thickness direction T_OPAnd a2 nd absorbent material 47 which does not overlap in the thickness direction T and is disposed in the 2 nd absorbent core overlapping region C2_OPA pair of No. 2 absorbent core non-overlapping regions C2 of both ends of_NP. No. 2 absorbent core overlap region C2_OPAnd a pair of No. 2 absorbent core non-overlapping regions C2_NPIs disposed in the crotch region MA, the back region BA, and the stomach region FA. The crotch region MA, the back-side region BA, and the stomach-side region FA will be described later.

In addition, the absorber 14 is divided in the crotch region MA in the width direction W into a1 st absorbent core overlapping region C1 overlapping the 1 st absorbent material 45 in the thickness direction T_OPAnd a region C1 which does not overlap with the 1 st water-absorbent material 45 in the thickness direction T and is disposed in the 1 st absorbent core overlapping region_OPA pair of 1 st absorbent core non-overlapping areas C1 of both ends_NP。

The 1 st and 2 nd absorbent materials 45 and 47 have the same width in the width direction W and their end edges in the width direction W coincide in the thickness direction T, and therefore, the 1 st absorbent core overlapping region C1_OPAn overlapping region C2 with the No. 2 absorbent core in the thickness direction T_OPIn agreement, a pair of No. 1 absorbent core non-overlapping regions C1_NPA pair of 2 nd absorbent core non-overlapping regions C2 in the thickness direction T_NPAnd (4) the same.

The intermediate layer 43 is formed of a single liquid-permeable intermediate sheet 43S (specifically, a through-air nonwoven fabric including sheath-core composite fibers). The middle layer 43 includes a component disposed in the 2 nd absorbent core overlap region C2_OPIntermediate layer overlap portion 43 of_OPAnd a pair of No. 2 absorbent core non-overlapping regions C2_NPA pair of intermediate layer non-overlapping portions 43_NP. In addition, the middle layer 43 extends over the 1 st absorbent core overlap region C1_OPAnd a pair of 1 st absorbent core non-overlapping regions C1_NPAnd (4) ground configuration.

The intermediate layer 43 is formed by an integral intermediate sheet 43S folded according to 4 folding axes 103, 104, 105, 106 extending in the length direction L. The 4 folding axes 103, 104, 105, 106 are arranged in order from one side of the middle sheet 43S to the other side. In addition, the intermediate sheet 43S has a substantially uniform weight per unit area.

The intermediate sheet 43S is divided into a1 st sheet portion 43a disposed inside the folding axis 104 and the folding axis 105, a pair of 2 nd sheet portions 43b disposed inside the folding axis 103 and the folding axis 106 except for the 1 st sheet portion 43a, and a pair of 3 rd sheet portions 43c disposed outside the folding axis 103 and the folding axis 106 in the unfolded state.

With respect to the intermediate sheet 43S in the unfolded state, the intermediate layer 43 is formed by folding the pair of 2 nd sheet portions 43b toward the inside with the folding axis 104 and the folding axis 105 as axes, and then folding the pair of 3 rd sheet portions 43c toward the outside with the folding axis 103 and the folding axis 106 as axes.

The 1 st sheet portion 43a is adjacent to the 1 st absorbent material 45, and the 1 st sheet portion 43a is disposed in the 2 nd absorbent core overlapping region C2 across the longitudinal center line CL_OP. The pair of 2 nd sheet portions 43b are disposed so as to approach the longitudinal center line CL from both ends (not shown) in the width direction W of the 1 st sheet portion 43a and not to be in contact with the longitudinal center line CL. The pair of 3 rd sheet parts 43C are adjacent to the 2 nd absorbent material 47, and the pair of 3 rd sheet parts 43C are further arranged in the 2 nd absorbent core non-overlapping area C2 so as to be apart from the longitudinal center line CL from both ends (not shown) of the pair of 2 nd sheet parts 43b close to the longitudinal center line CL_NP。

The 1 st sheet part 43a and the pair of 2 nd sheet parts 43b are disposed at the 2 nd absorbent core overlapping region C2_OPA pair of the 3 rd sheet portions 43C are disposed in the 2 nd absorbent core overlapping region C2_OPAnd a pair of No. 2 absorbent core non-overlapping regions C2_NP。

The 1 st piece portion 43a, the pair of 2 nd piece portions 43b, and the pair of 3 rd piece portions 43c are not joined to each other.

The absorbent body 14 has channels 48. The channels 48 are strip-shaped regions that are disposed in the 1 st absorbent layer 41 (specifically, the 1 st absorbent material 45) and extend in the longitudinal direction L. The channels 48 are arranged so as to overlap the longitudinal center line CL of the 1 st absorbent layer 41 (specifically, the 1 st absorbent material 45) in the thickness direction T. At the channel 48The 2 nd water absorbent material 47 has a weight per unit area of 0g/m². The 2 nd absorbent layer 42 has no channels.

The portion of the absorbent body 14 that overlaps the channels 48 in the thickness direction T forms a low basis weight region LB in which the weight per unit area of the absorbent body 14 is lower than the weight per unit area of the portion adjacent to the channels 48 in the width direction W.

The absorber 14 has a low basis weight region LB in the crotch region MA, the back-side region BA, and the stomach-side region FA.

The 1 st water absorbing material 45 and the 2 nd water absorbing material 47 contain Super Absorbent Polymers (SAP). The basis weight of the super absorbent polymer of each of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be appropriately adjusted in accordance with the absorption performance required for the pants-type diaper 1, but for example, each of them is 10g/m²～500g/m²Preferably 100g/m²～400g/m²。

The basis weights of the 1 st water-absorbing material 45 and the 2 nd water-absorbing material 47 may be larger in one than in the other, or may be the same. Wherein, the same means that one is in the range of 100% + -30% of the other. The 1 st water absorbent material 45 and the 2 nd water absorbent material 47 may further have hydrophilic fibers such as water absorbent fibers (e.g., pulp fibers). The proportion of the super absorbent polymer in the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferably 95 to 100% by mass.

Therefore, the 1 st water-absorbent material 45 and the 2 nd water-absorbent material 47 can be said to contain a super absorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet.

The proportion of the super absorbent polymer in the absorbent body 14 (including not only the 1 st and 2 nd water absorbent materials 45 and 47 but also the adhesive, the 1 st base 44, the intermediate layer 43, and the 2 nd base 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass.

In embodiment 1, the 1 st water absorbing material 45 and the 2 nd water absorbing material 47 are each formed of only a super absorbent polymer and do not contain hydrophilic fibers.

Preferably, 90 to 100 mass% of the superabsorbent polymer is formed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having the above particle diameter have a small and uniform particle diameter and are therefore easily retained in the adhesive. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.

The adhesive is not particularly limited as long as it can fix the super absorbent polymer, and examples thereof include a hot melt adhesive. The pattern of the adhesive to be applied is not particularly limited, but examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive can be appropriately adjusted so as not to significantly reduce the liquid absorbency of the absorbent body 14, and each layer is, for example, 3g/m²～50g/m². Here, each layer means a layer of the adhesive between the 1 st water absorbent material 45 and the 1 st base 44, a layer of the adhesive between the 1 st water absorbent material 45 and the intermediate layer 43, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.

The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric containing synthetic fibers, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the 1 st base material 44 include a spun-bonded nonwoven fabric and a hot-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), or a combination thereof.

The synthetic fibers are preferably hydrophilized by a known method.

The liquid-permeable sheet may be, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, or a nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined, such as a spunlace nonwoven fabric. In embodiment 1, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used.

The 1 st substrate 44 may be formed by laminating one or more kinds of the nonwoven fabrics.

The unit area weight of the No. 1 substrate 44 is, for example, 10g/m²～100g/m²Preferably 20g/m²～80g/m². The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The 2 nd substrate 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. Examples of the 2 nd base 46 include nonwoven fabrics formed of synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, or a combination thereof. Specifically, the 2 nd substrate 46 may be, for example, a spun-bonded nonwoven fabric containing nylon, a spun-laced nonwoven fabric containing rayon fibers and/or pulp fibers, or the like. The spunlace nonwoven containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In embodiment 1, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used.

The 2 nd substrate 46 may be formed of one of the nonwoven fabrics, or may be formed by laminating a plurality of nonwoven fabrics.

The basis weight of the No. 2 substrate 46 is, for example, 10g/m²～200g/m²Preferably 35g/m²～150g/m². The thickness of the 2 nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The intermediate layer 43 (intermediate sheet 43S) is, for example, a sheet similar to the 1 st substrate 44. As an intermediateThe weight per unit area of the layer 43 is, for example, 10g/m²～100g/m²Preferably 15g/m²～80g/m². The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

In embodiment 1, as shown in fig. 5, the absorber 14 includes a back-side region BA, a stomach-side region FA, and a crotch region MA which are arranged in the longitudinal direction L. Here, the back-side area BA is an area of the absorbent body 14 that overlaps with the back-side portion 3 in the thickness direction T. The abdomen-side region FA is a region of the absorbent body 14 that overlaps the abdomen-side portion 2 in the thickness direction T. The crotch region MA is a region of the absorber 14 between the back-side region BA and the stomach-side region FA, i.e., a region overlapping with the crotch portion 4 in the thickness direction T. Thus, the absorber 14 is divided into a back-side region BA overlapping the back-side portion 3, a stomach-side region FA overlapping the stomach-side portion 2, and a crotch region MA overlapping the crotch portion 4 along the longitudinal direction L.

In embodiment 1, the absorbent body 14 includes SAP high area weight regions 14a, SAP low area weight regions 14b, and SAP non-arrangement regions 14 c. The SAP high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is relatively high, and is a region in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 overlap in the thickness direction T. The SAP low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is relatively low, and is a region in which the 1 st absorbent layer 41 is not present and only the 2 nd absorbent layer 42 is present in the thickness direction T. The SAP non-arrangement region 14c is a region not containing a super absorbent polymer, and is a region where the 1 st absorption layer 41 and the 2 nd absorption layer 42 are not present in the thickness direction T. The term "not containing a super absorbent polymer" includes the case where the weight per unit area of the super absorbent polymer is very small although the super absorbent polymer is present. "very small" means that the weight per unit area of the super absorbent polymer is 5% or less of the weight per unit area of the super absorbent polymer in the SAP high weight per unit area region 14 a.

Thus, in the absorbent body 14, the back-side area BA includes back-side SAP high-area-weight areas BAa as the SAP high-area-weight areas 14a, back-side SAP low-area-weight areas BAb as the SAP low-area-weight areas 14b, and back-side SAP non-arrangement areas barc as the SAP non-arrangement areas 14 c. In the absorbent body 14, the abdominal region FA includes the abdominal SAP high unit area weight region FAa as the SAP high unit area weight region 14a, the abdominal SAP non-arrangement region FAc as the SAP non-arrangement region 14c, and the abdominal SAP low unit area weight region FAb is not included. The crotch region MA has only the SAP high area weight region 14 a.

Therefore, the basis weight of the superabsorbent polymer in the back-side SAP high basis weight region BAa and the stomach-side SAP high basis weight region FAa is equivalent to the basis weight of the superabsorbent polymer in the crotch region MA. "equivalent" means that one is in the range of 0.7 to 1.3 times (100% ± 30%) the other.

The 2 nd absorbent layer 42 includes a protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the rear end in the longitudinal direction L in plan view. The protrusion includes a backside SAP low-area-weight region BAb, which is the same as the backside SAP low-area-weight region BAb. The 2 nd absorption layer 42 is covered with the intermediate layer 43, and thus the protruding portion, i.e., the skin side of the back-side SAP low-area-weight region BAb is covered with the intermediate layer 43 and the 1 st base material 44.

In the absorber 14, db2> dc2> da2 when the length of the back-side SAP high area weight region BAa, the length of the back-side SAP low area weight region BAb, and the length of the back-side SAP non-arrangement region barc are da2, db2, and dc2, respectively, in the longitudinal direction L. That is, in the back-side area BA, the length of the back-side SAP low-area-weight area BAb is made relatively long, the weight per unit area of the super absorbent polymer is suppressed to be low as a whole, and the super absorbent polymer is arranged to the rear side portion in the longitudinal direction L. It is possible to easily suppress the transmission leakage of the liquid that flows to the back side although the amount is small.

In the absorber 14, da1> dc1 where da1 represents the length of the abdominal-side SAP high basis weight region FAa and dc1 represents the length of the abdominal-side SAP non-arrangement region FAc in the longitudinal direction L. That is, in the abdomen-side region FA, the length of the abdomen-side SAP high basis weight region FAa is made relatively long, the basis weight of the super absorbent polymer is increased as a whole, and the super absorbent polymer is arranged at the front end in the longitudinal direction L. This makes it possible to reliably absorb the liquid on the abdominal side with a large amount of excretion.

In the absorber 14, dc2> dc1 in the longitudinal direction L. Making the length of the back-side SAP non-disposition region barc relatively long, the amount of use of the super absorbent polymer at the back-side region BA with a small amount of excretion is suppressed to be low, and making the length of the abdomen-side SAP non-disposition region FAc relatively short, the liquid at the abdomen-side region FA with a large amount of excretion can be easily and reliably absorbed.

In addition, in another embodiment, da2+ db2> da1 in the longitudinal direction L in the absorber 14. In this case, by disposing the super absorbent polymer in the back-side area BA further to the rear side in the longitudinal direction L, it is possible to more easily suppress the transmission leakage of the liquid flowing to the back side although the amount is small.

In the pants-type diaper 1 of embodiment 1, a pair of intermediate layer non-overlapping portions 43 are provided in the crotch region MA_NPIs respectively greater than the intermediate layer overlapping portion 43_OPHas a small average weight per unit area and a small thickness. Thus, the 2 nd absorbent core overlapping region C2 of the absorbent body 14_OPHas a rigidity equal to that of a pair of 2 nd absorbent core non-overlapping regions C2 of the absorbent body 14_NPEach No. 2 absorbent core non-overlapping area C2_NPThe difference in rigidity of (2) is large, and the boundary of the 2 nd water absorbent material 47 is likely to become a starting point of the deformation guide.

In addition, the end edge in the width direction of the 1 st absorbent material 45, i.e., the 1 st absorbent core overlapping region C1_OPA region C1 not overlapping with the pair of the No. 1 absorbent cores_NPThe boundary therebetween also functions as a base point of the above-described deformation guide.

In addition, in the 2 nd absorbent core overlap region C2_OPMiddle layer overlap 43 having a relatively large average basis weight_OPCan make the wearer not easily feel the hardness of the super absorbent polymer, andin a pair of 2 nd absorbent core non-overlapping regions C2_NPIn (2), a pair of intermediate layer non-overlapping portions 43 having relatively small average basis weights_NPThe wearer's legs can be made to feel soft. And, in the 2 nd absorbent core overlapping region C2_OPMiddle layer overlap 43 having a relatively large average basis weight_OPSince more liquid can be temporarily stored, the absorbent body 14 is excellent in absorbency.

In addition, the intermediate layer 43 is formed by a single intermediate sheet 43S that is folded, specifically, the 1 st sheet portion 43a, the pair of 2 nd sheet portions 43b, and the pair of 3 rd sheet portions 43c, and the 1 st sheet portion 43a, the pair of 2 nd sheet portions 43b, and the pair of 3 rd sheet portions 43c are not joined to each other, so the intermediate layer overlapping portion 43S_OPThe hardness of the 1 st and 2 nd water- absorbent materials 45 and 47 can be made less likely to be felt by the wearer by the restoring force of the intermediate sheet 43S.

As shown in fig. 6, when liquid, for example, the 1 st urine reaches the absorbent body 14, the liquid passes through the 1 st absorbent layer 41 (mainly the channel 48) and the intermediate layer 43, and reaches the 2 nd absorbent layer 42, at which time, the 2 nd absorbent layer 42 swells, and a void 101 is formed between the 1 st absorbent layer 41 (the 1 st sheet part 43 a), the pair of 2 nd sheet parts 43b, and the pair of 3 rd sheet parts 43c) by the restoring force of the intermediate sheet 43S (the 1 st sheet part 43a, the pair of 2 nd sheet parts 43b, and the pair of 3 rd sheet parts 43 c).

Specifically, in the 1 st absorbent layer 41, the liquid passes through the channels 48 and is rapidly transferred toward the intermediate layer 43. The 1 st water absorbent material 45 around the channel 48 absorbs the remaining liquid and swells mainly in the thickness direction T.

The intermediate layer 43 has a function of temporarily storing liquid, but in the intermediate layer 43, the 1 st sheet portion 43a and the pair of 2 nd sheet portions 43b and the pair of 3 rd sheet portions 43c are not present at the position overlapping with the channel 48 in the thickness direction T, and therefore the amount of temporarily storing liquid in the intermediate layer 43 is relatively small at the position overlapping with the channel 48 in the thickness direction T, enabling the liquid to be transferred to the 2 nd absorbent layer 42.

In the 2 nd absorbent layer 42, the liquid mainly reaches the position overlapping with the channel 48 in the thickness direction T, and the portion of the 2 nd absorbent layer 42 overlapping with the channel 48 in the thickness direction T bulges in the thickness direction T. The 2 nd absorbent layer 42 (the 2 nd absorbent material 47) swells in the thickness direction T, and a void 101 is formed between the 1 st absorbent material 45 and the 2 nd absorbent material 47 by the restoring force of the 1 st sheet part 43a, the pair of 2 nd sheet parts 43b, and the pair of 3 rd sheet parts 43 c.

Next, when additional liquid, for example, the 2 nd or later urine reaches the absorbent body 14, the intermediate layer 43 temporarily stores the liquid in the gap 101 and supplies the liquid to the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 as necessary.

The 1 st and 2 nd water- absorbent materials 45 and 47 to which the liquid is supplied can absorb the liquid and swell toward the void 101, and the 1 st and 2 nd water- absorbent materials 45 and 47, and thus the absorbent body 14 are excellent in the absorbency of a large amount of liquid, for example, multiple urine.

Next, a method for producing the absorbent body 14 will be described.

First, the sheet for the 2 nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied onto the sheet for the 2 nd substrate 46. Next, a super absorbent polymer was sprayed from a super absorbent polymer supply device onto both end portions and a central portion in the width direction W of the sheet for the 2 nd substrate 46 coated with the hot melt adhesive along the length direction L, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for the intermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2 nd substrate 46.

Next, the laminate was moved in the longitudinal direction L, and a super absorbent polymer was sprayed from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for the intermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1 st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for the intermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the sheet for the 2 nd base material 46 were folded back onto both side portions in the width direction W of the sheet for the 1 st base material 44 to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain the absorbent body 14.

Next, a method for manufacturing a pants-type diaper using the absorbent body 14 will be described.

A liquid-permeable sheet 12 is attached to the upper surface (the surface of the 1 st base 44) of the absorbent body 14 produced as described above, and a liquid-impermeable sheet 13 is attached to the lower surface (the surface of the 2 nd base 46) of the absorbent body 14, thereby obtaining a laminate. Next, the side sheets 17 with the leakage preventing walls 16 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Thereafter, the absorbent body 10 is attached to the cover sheet 5 (including the elastic members 6, 7, and 8), and both ends 2a and 2a in the width direction W of the abdomen-side portion 2 and both ends 3a and 3a in the width direction W of the back-side portion 3 are joined. Thereby, the pants-type diaper 1 is manufactured.

Fig. 7 is a diagram for explaining a pants-type diaper (not shown) according to another embodiment of the present disclosure (hereinafter, may be referred to as "embodiment 2"), and corresponds to fig. 3 of embodiment 1.

In the pants-type diaper (not shown) according to embodiment 2, the display portion 107 is disposed between the absorbent body 14 and the liquid-impermeable sheet 13, specifically, between the 2 nd base material 46 of the absorbent body 14 and the liquid-impermeable sheet 13 in the thickness direction T. The display unit 107 displays the state where the pants-type diaper 1 has absorbed liquid (e.g., urine) on the outer surface of the pants-type diaper 1, and functions to notify a user (e.g., mother).

The display portion 107 is disposed so as to overlap with the channels 48 disposed in the 1 st absorbent layer 41 (the 1 st absorbent material 45) in the thickness direction T, that is, so as to be disposed in the low basis weight region LB.

In the low basis weight region LB, the liquid passes through the channels 48 of the 1 st absorbent layer 41 (the 1 st absorbent material 45) and is rapidly transferred to the intermediate layer 43. In the low basis weight region LB, the intermediate layer 43 is formed only by the 1 st sheet portion 43a, and therefore, the liquid can be transferred to the 2 nd absorbent layer 42. The liquid that has reached the 2 nd absorption layer 42 reaches the display portion 107, and the display portion 107 can respond quickly.

The absorbent article provided with the absorbent body of the present disclosure is not particularly limited, and examples thereof include disposable diapers, incontinence pads, disposable pants, sanitary napkins, panty-type sanitary pads, panty liners, mattress pads, hemorrhoid pads, and pet diapers.

The absorbent body of the present disclosure includes an intermediate layer and an absorbent core containing a super absorbent polymer in the thickness direction of the absorbent body, and the intermediate layer can be disposed at a position closer to the liquid-permeable sheet side (skin side) than the absorbent core or at a position closer to the liquid-impermeable sheet side (garment side). This is from the viewpoint of the effect of the present disclosure.

In the absorbent body of the present disclosure, the intermediate layer may be disposed on the liquid-permeable sheet side of the absorbent core, and the absorbent body may further include an additional absorbent core including a super absorbent polymer on the liquid-permeable sheet side of the intermediate layer, that is, the absorbent body may include two absorbent cores (an absorbent core and an additional absorbent core) so as to sandwich the intermediate layer. Under predetermined conditions, the two absorbent cores are capable of expanding toward the void formed therebetween.

In an embodiment (embodiment 1 and embodiment 2) of the present specification, the absorbent core and the additional absorbent core are referred to as a2 nd water absorbent material and a1 st water absorbent material, respectively.

In the absorbent body of the present disclosure, both the absorption layer and the additional absorption layer provided as desired contain a super absorbent polymer. The super absorbent polymer is not particularly limited, and includes super absorbent polymers known in the art, and examples thereof include starch-based, cellulose-based, and synthetic polymer-based super absorbent polymers. Examples of the starch-based or cellulose-based Super absorbent Polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethylcellulose, examples of the synthetic Polymer-based Super absorbent Polymer include Super absorbent polymers (SAP, Super absorbent Polymer) such as polyacrylate, polysulfonate, maleic anhydride, polyacrylamide, polyvinyl alcohol, polyethylene oxide, polyaspartate, polyglutamate, polyalphaeophytate, starch, and cellulose, and the like, and a polyacrylate (particularly, sodium polyacrylate) Super absorbent Polymer is preferable.

In the absorbent body of the present disclosure, the absorbent layer and the additional absorbent layer provided as desired are not particularly limited as long as both are mainly composed of a super absorbent polymer, and may further contain hydrophilic fibers such as pulp fibers. The shape of the absorbent body in plan view is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of the absorbent body is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm.

The absorber of the present disclosure is divided in the crotch region along the width direction of the absorber into an absorbent core overlapping region overlapping with the absorbent core in the thickness direction of the absorber and a pair of absorbent core non-overlapping regions not overlapping with the absorbent core in the thickness direction of the absorber and disposed at both ends of the overlapping region.

In the absorbent body of the present disclosure, the intermediate layer is disposed over the absorbent core overlapping region and the pair of absorbent core non-overlapping regions, and the crotch region includes an intermediate layer overlapping portion disposed in the absorbent core overlapping region and a pair of intermediate layer non-overlapping portions disposed in the pair of absorbent core non-overlapping regions.

In the absorber of the present disclosure, the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion in the crotch region, or the thickness of each of the pair of intermediate layer non-overlapping portions is smaller than the thickness of the intermediate layer overlapping portion, and preferably, the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion in the crotch region. This is from the viewpoint of the effect of the present disclosure.

In the present specification, when the intermediate layer is formed of a single intermediate sheet or the like which is folded, the average basis weight can be visually judged. When it is difficult to visually judge, the intermediate layer is taken out from the absorbent body by cold spray or the like, the intermediate layer is separated into an intermediate layer non-overlapping portion and each intermediate layer non-overlapping portion of the pair of intermediate layer non-overlapping portions, and the average basis weight is calculated from the area, mass, or the like of these portions, whereby the magnitude of the average basis weight can be determined.

In the present specification, the size of the thickness refers to the size of the maximum thickness. When the intermediate layer is formed of a single intermediate sheet or the like which is folded, the thickness can be visually determined. When it is difficult to visually determine the thickness, the thickness can be determined by cutting the crotch region of the absorbent body or the absorbent article in the width direction and observing the cross section with a microscope or the like.

In addition, the thickness can be measured by a three-dimensional X-ray CT apparatus (TDM-1000-IS/SP manufactured by Daitan Kagaku K.K.). For example, the thickness of a desired portion (an intermediate layer overlapping portion or an intermediate layer non-overlapping portion) can be determined by measuring the thickness of the desired portion at arbitrary 20 points in an image obtained by scanning using a three-dimensional measurement X-ray CT apparatus and averaging.

In the absorbent body of the present disclosure, the intermediate layer overlapping portion may be formed of 1 sheet portion or a laminate of a plurality of sheet portions, and the laminate of a plurality of sheet portions may be a laminate of a plurality of sheet portions independent of each other or a laminate of a plurality of continuous sheet portions (a folded product of a single sheet). In the absorbent body of the present disclosure, the intermediate layer overlapping portion is preferably a laminate of a plurality of sheet portions independent of each other or a laminate of a plurality of continuous sheet portions (single sheet folded matter), and more preferably a laminate of a plurality of continuous sheet portions (single sheet folded matter). This is from the viewpoint of formation of voids, improvement of wearing feeling, and the like.

In the case where the intermediate layer is a laminate of a plurality of continuous sheet portions (a folded product of a single sheet), the intermediate layer preferably has an Ω structure (the 1 st sheet portion forms a top portion and the 3 rd sheet portion forms a bottom portion), and the intermediate layer may have a structure in which Ω structures are combined, for example, a structure in which an Ω structure is arranged above an Ω structure (for example, an Ω structure is further arranged in the 1 st sheet portion as a top portion).

In the case where the intermediate layer has an Ω structure, the 1 st sheet portion may be in contact with the absorbent core, and the 3 rd sheet portion may be in contact with the absorbent core, but the 3 rd sheet portion is preferably in contact with the absorbent core. This is from the viewpoint of void formation.

In a laminate of a plurality of sheet portions, the sheet portions may or may not be joined to each other at the crotch region, and preferably are not joined to each other. This is from the viewpoint of void formation.

In addition, the sheet portions may be locally joined to each other from the viewpoint of suppressing twisting of the absorbent body after the absorbent body has absorbed a large amount of liquid.

In the case where the absorber includes the abdomen-side region and/or the back-side region, the sheet portions may be partially or entirely bonded to each other in the abdomen-side region and/or the back-side region.

The intermediate layer may be bonded to the absorbent core and an additional absorbent core provided as desired by hot melt adhesive or the like, or may be unbonded, and bonding is preferable. This is from the viewpoint of reliably forming the void.

Preferably, the absorbent body of the present disclosure includes a low basis weight region having a smaller basis weight than the surrounding region at a position overlapping the longitudinal centerline in the thickness direction of the absorbent body. This makes it possible to use the position of the longitudinal centerline of the absorber as a base point for deformation guidance.

The periphery is preferably a periphery in the width direction of the low basis weight region. This is for the purpose of deformation guiding the absorbent body in the width direction.

Further, the low basis weight region is preferably disposed in the crotch region, and when the absorber includes a ventral region and/or a dorsal region, the absorber may include the low basis weight region in the ventral region and/or the dorsal region. The low basis weight region can be achieved by disposing a channel described later in the absorbent core and/or an additional absorbent core provided as desired.

The absorbent body of the present disclosure can include a channel. The channels can be disposed in the absorbent core and/or in additional absorbent cores provided as desired. This makes it easy to guide the deformation of the absorbent body and thus the absorbent article when the absorbent article is worn. In addition, the channels enable liquid to be rapidly transferred in the thickness direction of the absorbent body.

From this viewpoint, the channel preferably extends in the longitudinal direction, and more preferably extends so as to overlap with the longitudinal centerline in the thickness direction of the absorbent body.

The channels are preferably arranged in the crotch region of the absorber, and in the case where the absorber includes a ventral region and/or a dorsal region, the channels may be arranged in the ventral region and/or the dorsal region.

In the present specification, the channels refer to regions of the absorbent core having a smaller weight per unit area than surrounding regions in the absorbent body. The above-mentioned channels preferably have a weight per unit area of 70% by mass or less, more preferably 50% by mass or less, further preferably 30% by mass or less, and may also have a weight per unit area of 0% by mass, as compared with the surrounding region of the absorbent core. This is from the viewpoint of using the channel as a starting point for the deformation guide.

In the case where the absorbent body includes a plurality of absorbent cores (for example, an absorbent core and an additional absorbent core), the weight per unit area of the channels means the weight per unit area of each absorbent core.

In addition, when the absorbent body includes a plurality of absorbent cores (for example, an absorbent core and an additional absorbent core), each of the plurality of absorbent cores may have the channel or may not have the channel.

The absorber of the present disclosure can include a display portion. The display portion is preferably disposed at a position overlapping the low basis weight region in the thickness direction of the absorbent body. This is from the viewpoint of rapid response of the display unit. The display unit may be disposed on, for example, a skin side of the absorbent body, a clothing side of the absorbent body, an inside of the absorbent body, or the like in the thickness direction of the absorbent body.

The absorbent article of the present disclosure includes a liquid-permeable sheet, a liquid-impermeable sheet, and the absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet. The absorbent article may include a display unit. The display portion is preferably disposed at a position overlapping the low basis weight region in the thickness direction of the absorbent article. This is from the viewpoint of rapid response of the display unit. The display portion may be disposed, for example, between the liquid-permeable sheet and the absorbent body or between the absorbent body and the liquid-impermeable sheet in the thickness direction of the absorbent article.

In the absorbent body and the absorbent article of the present disclosure, a display known in the art can be used without particular limitation, and examples thereof include a humidity display described in japanese patent application laid-open No. 2017 and 501768, a pH display, a composition containing a water-soluble dye, and the like.

In the case where the absorber of the present disclosure further includes a core cladding, the above-described core cladding can use a cladding pattern well known in the art. Preferably, the core wrap layer includes a skin-side core wrap layer disposed on the skin side and a garment-side core wrap layer disposed on the garment side, and the skin-side core wrap layer is folded back at the widthwise end of the absorber and covers the garment-side core wrap layer on the garment side, that is, has an overlapping portion of the skin-side core wrap layer and the garment-side core wrap layer. The overlapped portion can temporarily store liquid, and therefore the absorbent body is excellent in rewet property.

Claims (13)

1. An absorbent body for an absorbent article, having a longitudinal direction, a width direction, and a thickness direction, and having a longitudinal centerline and a crotch region,

the absorbent body is provided with an intermediate layer and an absorbent core containing a super absorbent polymer in the thickness direction,

the absorber is divided in the crotch region in the width direction into an absorbent core overlapping region overlapping with the absorbent core in the thickness direction and a pair of absorbent core non-overlapping regions not overlapping with the absorbent core in the thickness direction and disposed at both ends of the absorbent core overlapping region,

the intermediate layer includes an intermediate layer overlapping portion disposed in the absorbent core overlapping region and a pair of intermediate layer non-overlapping portions disposed in the pair of absorbent core non-overlapping regions in the crotch region,

in the crotch region, the average basis weight of each of the pair of intermediate layer non-overlapping portions is smaller than the average basis weight of the intermediate layer overlapping portion, or the thickness of each of the pair of intermediate layer non-overlapping portions is smaller than the thickness of the intermediate layer overlapping portion.

2. The absorbent body according to claim 1, wherein,

in the crotch region, the average weight per unit area of the non-overlapping portion of the intermediate layer is less than the average weight per unit area of the overlapping portion of the intermediate layer.

3. The absorbent body according to claim 1 or 2, wherein,

the intermediate layer overlapping portion is formed of an integral intermediate sheet that is folded, and includes a plurality of sheet portions.

4. The absorbent body according to claim 3, wherein,

the plurality of sheet portions are not joined to each other.

5. The absorbent body according to claim 3, wherein,

the intermediate layer has a1 st sheet portion, a pair of 2 nd sheet portions, and a pair of 3 rd sheet portions,

the 1 st sheet portion is disposed in the absorbent core overlapping region across the longitudinal centerline,

the pair of 2 nd sheet portions are disposed closer to the longitudinal center line than the both ends in the width direction of the 1 st sheet portion and do not contact the longitudinal center line,

the pair of 3 rd sheet parts are further disposed in the absorbent core non-overlapping region so as to be apart from the longitudinal centerline from both ends of the pair of 2 nd sheet parts close to the longitudinal centerline.

6. The absorbent body according to claim 5, wherein,

a pair of the 3 rd sheet portions are disposed on the absorbent core side of the 1 st sheet portion.

7. The absorbent body according to claim 4, wherein,

the intermediate layer is disposed on the skin side, the absorbent core is disposed on the garment side, and the absorbent body further includes an additional absorbent core containing a super absorbent polymer on the skin side of the intermediate layer.

8. The absorbent body according to claim 7, wherein,

in the crotch region, the supplemental absorbent core is provided with a channel at a position overlapping the longitudinal centerline in the thickness direction.

9. The absorbent body according to claim 1 or 2, wherein,

the absorber includes a low basis weight region having a lower basis weight than the surrounding region at a position in the crotch region that overlaps the longitudinal centerline in the thickness direction.

10. The absorbent body according to claim 9, wherein,

the absorber includes a display portion at a position overlapping the low basis weight region in the thickness direction.

11. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet,

the absorbent body according to any one of claims 1 to 10.

12. The absorbent article of claim 11,

the absorber includes a low basis weight region having a lower basis weight than the surrounding region at a position in the crotch region that overlaps the longitudinal centerline in the thickness direction,

the absorbent article includes a display portion at a position overlapping the low basis weight region in the thickness direction.

13. The absorbent article of claim 12,

the display unit is disposed between the liquid-permeable sheet and the absorbent body or between the absorbent body and the liquid-impermeable sheet.

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