Absorbent article

Abstract

An absorbent article (1) provided with a liquid-absorbent absorbent core (11) having an up-down direction, a transverse direction, and a front-rear direction that intersect each other, the absorbent article (1) having, in the front-rear direction, a front-side waist-encircling section (30) positioned on the front side, a rear-side waist-encircling section (40) positioned on the rear side, and a crotch section (CA) positioned between the front-side waist-encircling section (30) and the rear-side waist-encircling section (40), the absorbent article (1) being characterized in that, in the unfolded state, the front-side waist-encircling section (30) and the rear-side waist-encircling section (40) are separated from each other; the longitudinal direction of the absorbent core (11) is along the vertical direction, and in a side end resistance test in which the resistance value with respect to the side end of the absorbent article (1) in the unfolded state is measured, the maximum value of the resistance value in the side end resistance test in the center of the absorbent article (1) in the longitudinal direction is 0.9 N or less. The maximum value of the amount of compression work WC in the thickness direction of the absorbent core 11 in the center of the absorbent article 1 in the longitudinal direction is 4.0 gf cm / cm2 or less.

Description

Technical Field

[0001] The present invention relates to absorbent articles. Background Art

[0002] Conventionally, the following technology is known: a compression portion (e.g., embossing), slits, etc. are provided in a linear shape on the absorbent body (absorbent core) of an absorbent article, and the absorbent body is bent and deformed along the linear compression portion, etc. For example, Patent Document 1 discloses the following technology: a plurality of slits and grooves (bending guide line group 50) extending in the longitudinal direction are provided in the crotch portion of the absorbent core, and the slits and grooves become the starting point of deformation when an external force is applied, thereby making the absorbent core easy to deform and achieving a good wearing feeling.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-22727 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in Patent Document 1 and conventional absorbent articles, there is a problem that the easier it is to deform the absorbent core, the more the shape of the absorbent core is distorted, and the more easily excrement leaks from the absorbent article.

[0008] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an absorbent article that can reduce discomfort to the wearer and reduce leakage of excrement.

[0009] Means for solving problems

[0010] The main technical solution for achieving the above-mentioned purpose is an absorbent article, which has mutually intersecting up-down directions, lateral directions and front-to-back directions, and has an absorbent core with liquid absorption, and has a front waistline portion located on the front side, a rear waistline portion located on the rear side and a crotch portion located between the front waistline portion and the rear waistline portion in the front-to-back direction, characterized in that in the unfolded state, the length direction of the absorbent core is along the up-down direction, and in a side end resistance test for measuring the resistance value relative to the side end of the absorbent article in the unfolded state, the maximum value of the resistance value of the side end resistance test of the central part in the length direction of the absorbent article is less than 0.9N, and the maximum value of the compressive work WC of the central part in the length direction of the absorbent article relative to the thickness direction of the absorbent core is 4.0gf·cm / cm 2 the following.

[0011] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to reduce the discomfort felt by the wearer and to prevent the shape of the absorbent article or the absorbent core from being deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic perspective view of the diaper 1.

[0015] Figure 2 It is a top view of the diaper 1 in the unfolded state and the stretched state.

[0016] Figure 3 yes Figure 2 A schematic cross-sectional view taken along line AA of FIG.

[0017] Figure 4A is a top view of the absorbent body 10, Figure 4B yes Figure 4A A schematic cross-sectional view taken along line BB of FIG.

[0018] Figure 5 It is an enlarged plan view of the absorbent core 11 for explaining the arrangement of the deformation guide part 50.

[0019] Figure 6 It is a plan view for explaining the arrangement of the adhesive region 70 for joining the absorbent body 10 and the waist member 20.

[0020] Fig. 7A It is a plan view for explaining the state of the initial position of the side end resistance test of the diaper 1. Figure 7B yes Fig. 7A A schematic cross-sectional view at the center position CL.

[0021] Fig. 8A It is a top view explaining the pressed state of the side end resistance test of the diaper 1. Figure 8B yes Fig. 8A A schematic cross-sectional view at the center position CL.

[0022] Fig. 9 It is a figure which shows each measurement result of diaper 1 and a conventional product.

[0023] Fig.10 This is a diagram showing the absorbent body 10 in an enlarged manner.

[0024] Fig.11 It is a diagram for explaining the adhesion region 70 .

[0025] Fig. 12AThis is a diagram for explaining how the absorbent body deforms when a person walks while wearing a conventional pants-type diaper as a comparative example. Fig. 12B The diagram is for explaining how the absorbent body 10 is deformed when the user walks while wearing the diaper 1.

[0026] Fig.13 It is a diagram for explaining a modified example of the adhesion region 70 .

[0027] Fig.14A It is a top view of the diaper 2 in the unfolded and stretched state. Fig. 14B yes Fig.14A A schematic cross-sectional view taken along line DD of FIG. DETAILED DESCRIPTION

[0028] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0029] Form 1 is an absorbent article having mutually intersecting up-down directions, lateral directions and front-to-back directions, and having an absorbent core with liquid absorption, and having a front waistline portion located on the front side, a rear waistline portion located on the rear side and a crotch portion located between the front waistline portion and the rear waistline portion in the front-to-back direction, characterized in that in an unfolded state, the length direction of the absorbent core is along the up-down direction, and in a side end resistance test for measuring the resistance value relative to the side end of the absorbent article in the unfolded state, the maximum value of the resistance value of the side end resistance test of the central portion in the length direction of the absorbent article is less than 0.9N, and the maximum value of the compressive work WC of the central portion in the length direction of the absorbent article relative to the thickness direction of the absorbent core is 4.0gf·cm / cm 2 the following.

[0030] In order to reduce the discomfort in the crotch when the absorbent article is worn, it is desirable to use a soft and easily deformable absorbent core. However, a soft and easily deformable absorbent core may not be able to properly absorb excrement due to the deformation of the absorbent core, and excrement may leak from the absorbent article. According to form 1, compared with the case where the resistance value of the side end resistance test of the central part in the longitudinal direction of the absorbent article is greater than 0.9N, the rigidity and discomfort felt by the wearer from the crotch of the absorbent article when worn can be reduced, and the compression work ratio of the central part in the longitudinal direction of the absorbent article is 4.0gf·cm / cm 2 Compared with a larger case, the change in thickness of the absorbent article relative to the force from the thickness direction can be reduced, thereby reducing the discomfort caused to the wearer, and can make the shape of the absorbent article and the absorbent core less likely to be deformed, which can reduce the leakage of excrement.

[0031] In aspect 2, in the absorbent article according to aspect 1, a minimum value of the compressive resilience RC of the central portion in the longitudinal direction of the absorbent article with respect to the thickness direction is 35% or more.

[0032] According to form 2, even when a force is applied to the absorbent article in the thickness direction, the absorbent article is easily restored in the thickness direction compared to the case where the compression resilience RC in the thickness direction is lower than 35%, so the shape of the absorbent article is easily maintained.

[0033] In aspect 3, in the absorbent article according to aspect 1 or 2, the maximum value of the bending rigidity B of the center portion in the longitudinal direction of the absorbent article is 4.5 gf·cm 2 / cm or less.

[0034] According to the third aspect, the bending rigidity B of the central portion in the longitudinal direction of the absorbent article is 4.5 gf·cm 2 When worn, the absorbent article can be easily deformed according to the body and movement of the wearer compared to a case where the absorbent article has a larger thickness than that of the absorbent article.

[0035] In form 4, based on the absorbent article described in any one of forms 1 to 3, the maximum value of the resistance value of the side end resistance test of the central part in the longitudinal direction of the absorbent article is 0.6N or less, and the maximum value of the compressive work WC of the central part in the longitudinal direction of the absorbent article relative to the thickness direction is 3.83gf·cm / cm 2 Below, and the minimum value of the compression resilience RC of the central portion in the longitudinal direction of the absorbent article is 46% or more.

[0036] According to the fourth aspect, the rigidity and discomfort felt by the wearer from the crotch portion of the absorbent article when worn can be reduced, and the shape of the absorbent article and the absorbent core can be made less likely to be deformed.

[0037] In form 5, based on the absorbent article recorded in any one of forms 1 to 4, in the stretched state, the value obtained by dividing the lateral length of the absorbent core at the center position in the longitudinal direction of the absorbent article by the lateral length of the upper end of the front waistline portion is greater than 15%.

[0038] According to form 5, the rigidity and discomfort felt by the wearer from the crotch portion of the absorbent article when worn can be reduced, and the absorbent core can be made wider compared to a case where the value obtained by dividing the lateral length of the absorbent core at the center position in the longitudinal direction of the absorbent article by the lateral length of the upper end of the front waistline portion is smaller than 15%, thereby alleviating concerns about leakage of excrement.

[0039] In form 6, based on the absorbent article recorded in any one of forms 1 to 5, the absorbent article comprises: an absorbent body, the absorbent body having the absorbent core; and an outer body, the outer body having the front waistline portion, the rear waistline portion and the crotch portion, wherein in an unfolded and stretched state, the absorbent body and the outer body are fixed in a bonding area coated with an adhesive, and when observed along the thickness direction, in the crotch portion, there is a non-bonded area where the adhesive is not provided in the overlapping area where the absorbent body and the outer body overlap.

[0040] According to form 6, since the non-bonded area reduces the rigidity of the absorbent article compared to the bonded area, it is easy to reduce the resistance value of the side end resistance test of the crotch portion, which can reduce the rigidity and discomfort felt by the wearer from the crotch portion of the absorbent article when wearing it.

[0041] According to a seventh aspect, in the absorbent article according to the sixth aspect, the non-adhesive region is provided at an end portion in the lateral direction of the overlapping region when viewed in the thickness direction.

[0042] According to form 7, the absorbent body is fixed to the outer body by using the adhesive area, and the non-adhesive area is provided at the end in the lateral direction of the crotch part, so that the resistance value of the side end resistance test can be easily reduced, and the rigidity and discomfort felt by the wearer from the rear side of the crotch part of the absorbent article when wearing it can be reduced.

[0043] In form 8, based on the absorbent article described in form 6 or 7, in the unfolded and stretched state, the lateral length of the bonding area at the center position in the longitudinal direction of the absorbent article is less than 1 / 2 of the length of the widest bonding portion where the lateral length of the bonding area is the widest.

[0044] According to form 8, since the rigidity of the crotch portion can be reduced, it is easy to reduce the resistance value of the side end resistance test of the crotch portion, and the rigidity and discomfort of the absorbent article that the wearer may feel when wearing it can be reduced.

[0045] In form 9, based on the absorbent article recorded in any one of forms 6 to 8, in the unfolded and stretched state, the lateral length of the bonding area at the center position in the longitudinal direction of the absorbent article is less than 3 / 4 of the lateral length of the absorbent core.

[0046] According to form 9, since the rigidity of the crotch portion can be reduced, it is easy to reduce the resistance value of the side end resistance test of the crotch portion, and the rigidity and discomfort of the absorbent article that the wearer may feel when wearing it can be reduced.

[0047] In aspect 10, in the absorbent article according to any one of aspects 6 to 9, in the unfolded and stretched state, the length of the non-adhesive region in the longitudinal direction is at least 1 / 2 of the length of the absorbent body in the longitudinal direction.

[0048] According to form 10, compared with the case where the length of the non-adhesive area in the longitudinal direction is shorter than 1 / 2 of the length of the absorbent body in the longitudinal direction, it is easy to reduce the resistance value of the side end resistance test, and the rigidity and discomfort felt by the wearer from the rear side of the crotch of the absorbent article when wearing it can be reduced.

[0049] In form 11, based on the absorbent article recorded in any one of forms 6 to 10, the absorbent core has a low unit area weight portion along the up and down direction, and when observed along the thickness direction, has a portion where the low unit area weight portion overlaps with the bonding area.

[0050] According to form 11, since the rigidity of the bonding area overlapping with the low unit area weight portion when viewed in the thickness direction can be reduced, it is easy to reduce the resistance value of the side end resistance test, and the rigidity and discomfort felt by the wearer from the rear side of the crotch of the absorbent article when worn can be reduced.

[0051] According to aspect 12, in addition to the absorbent article according to any one of aspects 1 to 11, the absorbent article comprises an outer sheet forming the front waistline portion, the rear waistline portion, and the crotch portion, and the outer sheet is not stretchable.

[0052] According to form 12, when the outer sheet shrinks, the absorbent core may shrink and the rigidity of the crotch portion may increase. However, by making the outer sheet non-stretchable, the concern about excessive shrinkage of the absorbent core can be reduced, and the concern about discomfort to the wearer due to the rigidity of the absorbent core can be reduced.

[0053] In form 13, based on the absorbent article described in form 12, in the unfolded state and the stretched state, a pair of front deformation guide portions are provided along the transverse direction at a position forward of the central position in the longitudinal direction, the front deformation guide portions guide the absorbent core to deform along the thickness direction, the pair of front deformation guide portions respectively have front inclined portions inclined from the front to the rear in the longitudinal direction and from the outer to the inner side in the transverse direction, the pair of front deformation guide portions respectively have an inclination starting point where inclination starts and an inclination ending point where inclination ends and which is located at a position further rearward than the inclination starting point, the inclination starting point is located forward of the rear end of the front waistline portion in the longitudinal direction, and the inclination ending points are separated from each other in the transverse direction.

[0054] According to form 13, when the wearer extends his legs forward while walking, the absorbent core is deformed in a manner that is bent in the thickness direction along the groin region with the front deformation guide portion as the starting point. In addition, since the pair of front deformation guide portions are separated from each other, when the two legs are moved forward and backward while walking, the absorbent core is easily deformed following the movement of the left and right groin regions. Therefore, it is difficult for the groin region to feel uncomfortable while walking, and the worry of making the wearer feel rigid and causing discomfort to the wearer can be reduced.

[0055] In form 14, on the basis of the absorbent article described in form 13, a pair of rear deformation guide portions are provided along the transverse direction at a position rearward of the central position in the longitudinal direction, the rear deformation guide portions guide the absorbent core in such a manner as to deform along the thickness direction, the pair of rear deformation guide portions respectively have rear inclined portions inclined from the rear side in the longitudinal direction toward the front side and from the outer side to the inner side in the transverse direction, the pair of rear deformation guide portions respectively have an inclination starting point where inclination starts and an inclination ending point located at a position forward of the inclination starting point and where inclination ends, and the inclination ending points are away from each other in the transverse direction.

[0056] According to form 14, the absorbent core is deformed in a manner that is bent in the thickness direction along the buttocks starting from the rear deformation guide portion, so that interference between the legs and the absorbent core at the buttocks can be suppressed, and the wearer is less likely to feel uncomfortable. In addition, since the pair of rear deformation guide portions are independent of each other, when the legs move forward and backward during walking, the absorbent core is easily deformed following the movement of the left and right buttocks, which can reduce the worry of causing the wearer to feel rigidity and discomfort.

[0057] In form 15, based on the absorbent article described in form 13 or 14, the absorbent core has a narrowing portion in the crotch portion that narrows from the outside to the inside in the lateral direction, and has a portion in the longitudinal direction where the front inclined portion overlaps with the narrowing portion.

[0058] According to form 15, since the width of the absorbent core in the lateral direction is narrowed at the narrowed portion, it is difficult for the absorbent core to interfere with the legs when walking. Moreover, since the front inclined portion is provided overlapping with the narrowed portion, it is easier to deform along the front inclined portion at the narrowed width portion of the absorbent core. Therefore, when walking, the absorbent core is difficult to interfere with the groin part and is easy to deform, which can prevent the wearer from feeling uncomfortable.

[0059] In form 16, based on the absorbent article described in form 15, in the crotch portion, the absorbent core has a crotch wide portion at a position closer to the inside than the narrowing portion in the longitudinal direction, and the lateral length of the crotch wide portion is longer than the shortest part of the lateral length of the narrowing portion.

[0060] According to the sixteenth aspect, the absorbent core can be easily deformed according to the shape and movement of the wearer's body, and can easily absorb excrement, and the concern of excrement leakage can be reduced.

[0061] ===Present Implementation Method===

[0062] As an absorbent article according to an embodiment of the present invention, a pants-type disposable diaper 1 for adults (hereinafter also referred to as a “diaper 1”) will be described as an example.

[0063] <Basic structure of diaper 1>

[0064] Figure 1 It is a schematic perspective view of the diaper 1. Figure 2 It is a top view of the diaper 1 in the unfolded state and the stretched state. Figure 3 yes Figure 2 A schematic cross-sectional view taken along line AA of FIG. Figure 2 The diaper 1 in the unfolded and stretched state is viewed from the skin side. The "unfolded state" of the diaper 1 refers to a state in which the diaper 1 is unfolded in a plane as a whole by separating and opening the side joints 20s, 20s of the side portions of the front waistline portion 30 and the side portions of the rear waistline portion 40 on both sides of the diaper 1.

[0065] The "stretched state" refers to a state in which the entire diaper 1 (the entire product) is stretched without wrinkles, and specifically refers to a state in which the dimensions of each component constituting the diaper 1 (e.g., the absorbent body 10 and the waist member 20 described later) are consistent with or close to the dimensions of the component alone. In each figure, the CC line is the center line in the transverse direction (also referred to as the "central position CC in the transverse direction"), and the CL line is the center line in the longitudinal direction (also referred to as the "central position CL in the longitudinal direction").

[0066] The diaper 1 is a disposable diaper having a pants-like shape in a natural state. Figure 1 In the shorts-type state, the pants have mutually intersecting "up-down direction", "left-right direction" and "front-back direction", and have a waist opening BH and a pair of leg openings LH, LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the crotch side. In addition, the front side in the front-back direction corresponds to the wearer's ventral side, and the rear side corresponds to the wearer's back side. In addition, in Figure 2 In the unfolded state, the diaper 1 has a "front-rear direction" and a "lateral direction" that cross each other. Figure 2 The front-to-back direction in the unfolded state is along Figure 1 The longitudinal direction of the absorbent body 10 (absorbent core 11) is along the vertical direction. Hereinafter, the "front-rear direction" in the unfolded state of the diaper 1 is sometimes referred to as the "longitudinal direction". Figure 3 As shown, the direction in which the materials constituting the diaper 1 are stacked is referred to as the “thickness direction.” The side in contact with the wearer's skin in the thickness direction is referred to as the skin side, and the opposite side is referred to as the non-skin side.

[0067] The diaper 1 includes a liquid-absorbent main body 10 for absorbing excrement and a waist member (exterior body) 20 disposed on the non-skin side of the absorbent main body 10. The waist member 20 is an exterior member constituting the exterior body of the diaper 1.

[0068] from Figure 2 From the unfolded state, the absorbent body 10 and the waist member 20 are folded in half with the center position CL in the length direction (front-to-back direction) as the folding position. The front part of the waist member 20 and the rear part of the waist member 20, which are opposite to each other in the folded state, are joined and connected to each other at both sides in the lateral direction (left-right direction), and a pair of side joints 20s, 20s are formed. That is, the front part of the waist member 20 and the rear part of the waist member 20 are formed into a ring shape by a pair of side joints 20s, 20s. In addition, the side joints 20s are formed by known joining means such as welding and bonding. Thus, it becomes Figure 1 As shown, the diaper 1 is in a pants-type state with a waist opening BH and a pair of leg openings LH, LH formed therein.

[0069] In this embodiment, if Figure 2 As shown, the portion of the waist member 20 that overlaps with the side joint 20s formed on the front side in the longitudinal direction (front-to-back direction) is referred to as the "front waist portion 30". The front waist portion 30 is the portion that is located on the ventral side of the wearer when the diaper 1 is worn. Similarly, the portion of the waist member 20 that overlaps with the side joint 20s formed on the rear side in the longitudinal direction (front-to-back direction) is referred to as the "rear waist portion 40". The rear waist portion 40 is the portion that is located on the back side (buttocks side) of the wearer when the diaper 1 is worn. Furthermore, the portion that is located between the front waist portion 30 and the rear waist portion 40 in the longitudinal direction (front-to-back direction) is referred to as the "lower crotch portion CA". The lower crotch portion CA is the portion that is located in the crotch of the wearer when the diaper 1 is worn.

[0070] (Absorbent body 10)

[0071] Figure 4A is a top view of the absorbent body 10, Figure 4B yes Figure 4A The absorbent body 10 is a schematic cross-sectional view taken along the BB line of FIG. The absorbent body 10 comprises: an absorbent core 11, which absorbs excrement; a top sheet 12, which is arranged at a position closer to the skin side in the thickness direction than the absorbent core 11; and a back sheet 13, which is arranged at a position closer to the non-skin side than the absorbent core 11. However, the absorbent body 10 may also have sheet components other than these. For example, a second sheet (not shown) may be provided between the top sheet 12 and the absorbent core 11 in the thickness direction.

[0072] The absorbent core 11 is a member for absorbing and retaining excrement such as urine, and is formed, for example, of liquid-absorbing fibers such as pulp fibers mixed with superabsorbent polymers (SAP). In addition, the absorbent core 11 can also be covered on the outer peripheral surface with a liquid-permeable sheet member (core wrap sheet 11b) such as a tissue or nonwoven fabric. The absorbent core 11 of this embodiment has narrowed portions 11c1 and 11c2 between the front end and the rear end in the front-to-back direction (length direction), and the narrowed portions 11c1 and 11c2 are portions where the width in the lateral direction (left-right direction) is narrowed. In addition, the absorbent core 11 is provided with a deformation guide 50 and a slit 60, and the deformation guide 50 guides the absorbent core 11 in a manner that deforms in the thickness direction.

[0073] The deformation guide 50 can facilitate deformation of the absorbent core 11 in the thickness direction, thereby improving the followability during walking. Figure 51 is an enlarged top view of the absorbent core 11 for explaining the arrangement of the deformation guide 50. The deformation guide 50 is a low basis weight portion (low basis weight portion) having a lower basis weight (basis weight) than other regions of the absorbent core 11, for example, a portion formed in a concave shape from the skin side toward the non-skin side in the thickness direction of the absorbent core 11 (see Figure 4B ). When the diaper 1 is worn, the deformation guide portion 50 serves as a starting point for bending, and guides the absorbent core 11 so as to deform in the thickness direction.

[0074] In addition, the deformation guide 50 is not limited to the low unit weight portion as described above, and may be, for example, a slit where the unit weight of the absorbent core 11 is zero, or a high rigidity portion where the rigidity of the absorbent core 11 is increased. In addition, it may be a structure where a fold is formed in a predetermined portion of the absorbent core 11 to facilitate bending and deformation, or other structures. However, from the viewpoint of reducing discomfort in the groin area, it is desirable that the skin feel is soft when the diaper 1 is worn, and it is more preferable that the deformation guide 50 is composed of the low unit weight portion as described above.

[0075] In addition, a slit 60 as a low basis weight portion is provided in the central portion in the lateral direction (left-right direction) of the absorbent core 11 along the front-back direction (up-down direction). The slit 60 is provided in the portion where the absorbent core 11 is not provided with a super absorbent polymer (SAP) or liquid absorbent fiber. Figure 5 In the embodiment, the slit 60 has a predetermined width in the transverse direction and is arranged as a longitudinal groove that penetrates the absorbent core 11 in the thickness direction. When the diaper 1 is worn, the absorbent core 11 is deformed to convexly toward the skin side along the slit 60 in the crotch CA, thereby being able to easily fit along the wearer's excretion opening and the crotch crack of the buttocks, and the absorbency of excrement can be improved in the crotch. In addition, in the present embodiment, the slit 60 is set to be zero without a super absorbent polymer (SAP) or liquid absorbent fiber, but it can also be a low unit area weight portion along the front-back direction where the unit area weight of the absorbent core 11 is lower than that of other regions.

[0076] The top sheet 12 is a liquid-permeable sheet, for example, a hydrophilic air-through nonwoven fabric, a spunbond nonwoven fabric, etc. Figure 4B As shown, both side portions in the left-right direction are folded back toward the non-skin side so as to roll up the absorbent core 11.

[0077] The back sheet 13 is a double-layer structure of a liquid-impermeable sheet 13a and a non-skin side sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13a. As the liquid-impermeable sheet 13a, a sheet member having liquid-impermeability and moisture-permeability is used. For example, a microporous breathable resin film having a plurality of fine holes on a sheet mainly composed of a resin such as polyethylene or polypropylene can be used. On the other hand, as the non-skin side sheet 13b, a hydrophobic nonwoven fabric having softness is used. For example, hot air nonwoven fabric, spunbonded nonwoven fabric, etc. can be used.

[0078] A pair of anti-leakage wall portions 15 are provided along the longitudinal direction (front-back direction) on both sides of the absorbent body 10 in the left-right direction. In the present embodiment, the anti-leakage wall portions 15 are formed by the non-skin side sheets 13b described above. Specifically, a portion of the non-skin side sheets 13b is extended outward compared to the two ends of the absorbent core 11 in the lateral direction (left-right direction), and as shown in FIG. Figure 4B As shown in the figure, the diaper 1 is bent toward the skin side at multiple locations, thereby forming a pair of leakage-proof wall portions 15. The leakage-proof wall elastic member 16 such as an elastic thread is attached to the skin-side end portion (top end portion) of the leakage-proof wall portion 15 in a state of being stretched in the longitudinal direction (front-back direction). When the diaper 1 is worn, the leakage-proof wall portion 15 stands up toward the skin side of the wearer based on the elasticity of the leakage-proof wall elastic member 16 and fits against the crotch of the wearer.

[0079] (Waist member 20)

[0080] like Figure 3 As shown, the waist member 20 has: a skin side sheet 21, which is arranged on the skin side in the thickness direction; and a non-skin side sheet 32 ​​(front side) and a non-skin side sheet 42 (back side), which are stacked in a manner adjacent to the non-skin side of the skin side sheet 21. The waist member 20 as an outer member of the diaper 1 is basically a double-layer structure of the skin side sheet 21 and the non-skin side sheet 32 ​​(42), but may partially have a structure of three or more layers.

[0081] The front waistline portion 30 in the waistline member 20 has a skin side sheet 21, a non-skin side sheet 32, and a waist elastic member 35 and a leg elastic member 37 arranged therebetween in the thickness direction. The skin side sheet 21 is an outer sheet that is continuous from the front waistline portion 30 of the diaper 1 to the rear waistline portion 40 and forms the front waistline portion 30, the rear waistline portion 40 and the lower crotch CA, and is a sheet member that forms the outer shape of the waistline portion (exterior body) 20. The skin side sheet 21 is formed by, for example, SMS nonwoven fabrics, etc. The non-skin side sheet 32 ​​is a sheet member stacked on the non-skin side of the skin side sheet 21, and is formed by, for example, SMS nonwoven fabrics, etc. The upper end portion (front end portion in the front-to-back direction) of the non-skin side sheet 32 ​​is folded back from the non-skin side to the skin side and folded back from the front side to the rear side in the front-to-back direction to form a folded portion 32f. By covering a part (upper end) of the skin side sheet 21 with the folded portion 32f, it is possible to suppress the upper edge of the skin side sheet 21 from biting into the wearer's skin. However, the folded portion 32f may not necessarily be provided.

[0082] The waist elastic member 35 is composed of elastic cords and the like, and is arranged in a plurality of intervals between the skin side sheet 21 and the non-skin side sheet 32 ​​in the vertical direction, and is installed in a state stretched in the left-right direction. The elasticity exhibited by the waist elastic member 35 is used to fit the front waist circumference 30 to the wearer's ventral waist circumference. The leg elastic member 37 is composed of elastic cords and the like in the same manner as the waist elastic member 35, and is installed between the skin side sheet 21 and the non-skin side sheet 32 ​​in a state stretched in the left-right direction along the lower edge portion (i.e., a portion of the peripheral portion of the leg opening LH) in the vertical direction of the front waist circumference 30. The elasticity exhibited by the leg elastic member 37 is used to fit the leg opening LH to the wearer's leg circumference.

[0083] The rear waistline portion 40 in the waistline member 20 has a substantially similar structure to the front waistline portion 30. That is, the rear waistline portion 40 has: a skin side sheet 21 disposed on the skin side in the thickness direction; a non-skin side sheet 42 stacked on the non-skin side of the skin side sheet 21; and a waist elastic member 45 disposed between the skin side sheet 21 and the non-skin side sheet 42 in the thickness direction.

[0084] Regarding the appearance shape of the waist member 20, the front side and the rear side in the front-to-back direction are different, such as Figure 2As shown in the figure, a buttocks cover 46 having a substantially trapezoidal shape is provided in an area (lower crotch CA) below the side joint 20s of the rear waistline 40 in the vertical direction. The buttocks cover 46 is formed by laminating the non-skin side sheet 42 and the skin side sheet 21 in the same manner as the rear waistline 40, and the width thereof becomes narrower from the upper side toward the lower side in the vertical direction. By providing the buttocks cover 46, the waistline member 20 can widely cover the buttocks of the wearer when the diaper 1 is worn.

[0085] The buttocks cover 46 is provided with Figure 2 The leg elastic member 47 such as an elastic band as shown in the figure. The leg elastic member 47 is installed between the skin side sheet 21 and the non-skin side sheet 42 in a state of being stretched along the outer edge of the hip cover 46 (i.e., a part of the peripheral edge of the leg opening LH). The elasticity of the leg elastic member 47 makes it easy for the hip cover 46 to fit the wearer's hips when the diaper 1 is worn, and it is difficult for the hip cover 46 to rise from the hips.

[0086] In the diaper 1, the non-skin side surface (non-skin side sheet 13b) of the absorbent body 10 and the skin side surface (skin side sheet 21) of the waist member 20 are joined in the thickness direction by an adhesive region 70 formed of a joining material such as a hot melt adhesive. Figure 6 This is a plan view for explaining the arrangement of the adhesive region 70 for joining the absorbent body 10 and the waist member 20. The adhesive region 70 will be described in detail later.

[0087] <About improving wearability and reducing excrement leakage>

[0088] For a long time, absorbent articles such as disposable diapers have been required to have a soft wearing feel with less stiffness when worn. In particular, since a relatively rigid absorbent body (absorbent core) is provided in the crotch portion of the absorbent article, the crotch portion is likely to give the wearer a stiff wearing feel and discomfort. In order to reduce the stiff wearing feel given to the wearer, there are known methods of reducing the rigidity of the absorbent body by, for example, thinning the thickness of the absorbent body (absorbent core) of the absorbent article, reducing the amount of liquid absorbent fiber (pulp) contained in the absorbent body, providing an absorbent body without liquid absorbent fiber, changing the ratio of synthetic fibers, changing the unit area weight in the absorbent body, or providing a deformation guide portion of the absorbent body.

[0089] In order to reduce the stiff wearing feeling and discomfort caused by the absorbent body to the wearer, it is desirable to use a soft and easily deformable absorbent body. However, the lower the rigidity of the absorbent body is and the softer it is, the easier it is for the absorbent body to deform, and the easier it is for the shape of the absorbent body to be distorted when worn. In an absorbent body with a distorted shape, the absorbent body cannot reliably absorb excrement, and excrement may leak from the absorbent body or the absorbent article.

[0090] On the other hand, for the diaper 1 of the present embodiment, in the unfolded state, the maximum value of the resistance value of the side end resistance test of the central portion in the longitudinal direction of the diaper 1 is 0.9N or less, and the maximum value of the compressive work WC of the central portion in the longitudinal direction of the diaper 1 relative to the thickness direction is 4.0gf·cm / cm 2 the following.

[0091] By making the maximum value of the resistance value of the side end resistance test less than 0.9N, the crotch portion of the diaper 1 can be made softer than when the resistance value of the side end resistance test of the central portion in the longitudinal direction of the absorbent article is greater than 0.9N, thereby reducing the stiff wearing feeling and discomfort of the wearer of the diaper 1 caused by the rigidity of the crotch portion. In addition, by making the maximum value of the resistance value of the side end resistance test less than 0.9N, and making the compressive work WC of the central portion in the longitudinal direction of the diaper 1 relative to the thickness direction greater than 4.0gf·cm / cm 2 The thickness of the diaper 1 in the crotch portion is small, thereby reducing the change in the thickness of the diaper 1 relative to the force from the thickness direction. That is, the deformation of the absorbent core 11 relative to the force from the thickness direction can be reduced in the crotch portion. In addition, it is known to those skilled in the art related to absorbent articles that the smaller the value of the compression work WC is, the easier it is to maintain the shape of the absorbent core 11 of the absorbent article (diaper 1), and the more the function and performance of the absorbent core 11 can be exerted. Therefore, since the hard wearing feeling and discomfort brought to the wearer in the crotch portion CA can be reduced, and the shape of the absorbent core 11 (diaper 1) can be made difficult to be deformed, it is easy to properly absorb excrement and the concern about the leakage of excrement from the diaper 1 can be reduced. That is, a diaper 1 can be made that can exert the function of properly absorbing excrement while reducing the discomfort of the crotch portion when worn and maintaining the shape of the diaper 1.

[0092] The resistance value obtained by the side edge resistance test of the diaper 1 is the resistance value when a force is applied to the side edge of the diaper 1 from the outside to the inside in the lateral direction. The lower the resistance value of the side edge resistance test, the softer the side edge of the diaper 1 is, and the less likely it is to give a hard wearing feeling or discomfort to the wearer when wearing it.

[0093] The compressive work WC (gf·cm / cm) of the diaper 1 in the thickness direction 2 ) is a value indicating the ease of compression. The larger the value of the compression work WC, the easier it is to compress. In other words, it means softness. The smaller the value of the compression work WC, the harder it is to compress. In other words, it means stiffness. The compression work WC (gf·cm / cm) of the diaper 1 in the thickness direction 2) is not only the compressive work WC with respect to the absorbent core 11, but also the compressive work WC in the thickness direction with respect to the diaper 1 (absorbent body 10) including the skin side sheets 12, etc.

[0094] The maximum value of the resistance value of the side end resistance test is 0.9 N or less and the compressive work WC ratio of the central portion in the longitudinal direction of the diaper 1 to the thickness direction is 4.0 gf·cm / cm 2 The small means can be applied by designing the liquid absorbent fibers forming the absorbent core 11, designing the structure of the absorbent core 11, designing the structure of the crotch portion CA of the diaper 1, or combining these designs.

[0095] In the diaper 1 of the present embodiment, the maximum resistance value of the side end resistance test is 0.9N or less and the compressive work WC of the central portion in the longitudinal direction of the diaper 1 relative to the thickness direction is 4.0gf·cm / cm 2 The liquid absorbent fibers forming the absorbent core 11 are designed in a small manner. Specifically, the diaper 1 has conifer pulp fibers as liquid absorbent fibers, and a fiber agent that imparts specific functions is added to the conifer pulp fibers. As the fiber agent, a softener for softening the pulp fibers, a reinforcing agent for increasing the strength and durability of the pulp fibers, and the like can be appropriately selected and used. In addition, by designing the structure of the crotch portion CA of the diaper 1 described later in addition to the absorbent core 11 of conifer pulp fibers to which the fiber agent is added, or by designing the structure of the absorbent core 11, it is possible to more reliably make the maximum value of the resistance value of the side end resistance test of the diaper 1 less than 0.9N, and make the compressive work WC of the central portion in the length direction of the diaper 1 relative to the thickness direction less than 4.0gf·cm / cm 2 Small.

[0096] In the diaper 1 of the present embodiment, conifer pulp fibers are used as liquid absorbent fibers, but the present invention is not limited thereto. For example, wood pulp fibers and non-wood pulp fibers can be used. As wood pulp fibers, for example, conifer pulp fibers and broadleaf pulp fibers can be cited. As non-wood pulp fibers, for example, straw pulp fibers, bagasse pulp fibers, reed pulp fibers, kenaf pulp fibers, mulberry pulp fibers, bamboo pulp fibers, hemp pulp fibers, cotton pulp fibers (for example, cotton lint fibers), etc. can be cited.

[0097] The side end resistance test was performed by the following method. Fig. 7A It is a plan view for explaining the state of the initial position of the side end resistance test of the diaper 1. Figure 7B yes Fig. 7AA schematic cross-sectional view at the center position CL. Fig. 8A It is a top view explaining the pressed state of the side end resistance test of the diaper 1. Figure 8B yes Fig. 8A A schematic cross-sectional view of the center position CL. Figure 7B and Figure 8B The dimensions in the thickness direction may not be accurate.

[0098] First, the shorts type state ( Figure 1 ) The side joint portion 20s of the diaper 1 is cut off at the inner end in the transverse direction, and the folded state is opened to become an unfolded state.

[0099] Next, with the skin side of the unfolded diaper 1 facing downward, the front end of the front waistline portion 30 and the rear end of the rear waistline portion 40 are attached and fixed to the flat platform P in a state in which the diaper 1 is stretched in the longitudinal direction by 95% (when the elastic members such as the leakage-barrier elastic member 16 are stretched by 100%) and by 68% (when the elastic members such as the waist elastic members 35 and 45 are stretched by 100%). At this time, the front end (upper side in the wearing state) of the front waistline portion 30 attached to the flat platform P is a region with a length F1 of 50 mm from the front end, and the rear end (upper side in the wearing state) of the rear waistline portion 40 is a region with a length F1 of 50 mm from the rear end. Similarly, both transverse ends of the front waistline portion 30 and both transverse ends of the rear waistline portion 40 are attached and fixed to the flat platform P, respectively. Similar to the ends in the front-back direction, the ends of the front waistline 30 attached to the flat table P are regions with a lateral length F2 of 50 mm from both ends in the lateral direction, and the ends of the rear waistline 40 are regions with a lateral length F2 of 50 mm from both ends in the lateral direction. As a method of attaching the diaper 1 to the flat table P, for example, as shown in FIG. 7 , a double-sided tape 106 may be provided between the flat table P and the diaper 1 to fix them. Alternatively, a fixing member such as an adhesive may be provided between the flat table P and the diaper 1, or the diaper 1 may be placed on the flat table P and a general tape may be attached from above the diaper 1. In this state, the lateral center position CC and the longitudinal center position CL of the diaper 1 are previously determined.

[0100] The side end resistance measuring device 100 is used to measure the resistance value of one side in the lateral direction (the right side in Figures 7 and 8, the base 103 and the other side platform 105 are set on the flat surface 104 which is the bottom of the recessed portion). The side end resistance measuring device 100 includes a one-side pressing member 101, another-side pressing member 102, a base 103, another side platform 105, and a resistance measuring device 110. The flat platform P has a recessed portion that is recessed from the upper surface toward the bottom (in the thickness direction of the placed diaper 1). When viewed from above (in the Fig. 7A and Fig. 8A ), the lateral length of the recessed portion is longer than the lateral length of the diaper 1, the length V1 in the longitudinal direction is the length of the storage base 103 and the side end resistance measuring device 100, the depth from the upper surface of the flat table P (the length from the upper surface of the flat table P to the plane 104 of the recessed portion) V2 ( Figure 7B and Figure 8B ) is a length that enables the load portion tc (described later) of the side end resistance measuring device 100 to vertically abut against the side end of the diaper 1. By providing the recessed portion, the one side pressing member 101 fixed via the support portions ha, ha on the base 103, the load portion tc of the resistance measuring device 110, and the other side pressing member 102 on the other side platform 105 can vertically abut against the two side ends of the central portion of the diaper 1 in the longitudinal direction.

[0101] The one-side pressing member 101 and the other-side pressing member 102 are members for pressing the side ends of the diaper 1, and are respectively formed of chloroprene rubber sponges, and are longer in the thickness direction than the diaper 1 in the unfolded state. The other-side pressing member 102 is a member having a circular arc portion w with a diameter of 150 mm and a straight line portion s with a length of 130 mm along the length direction, and a transverse length (the length from the vertex of the circular arc portion w to the straight line portion s) of 40 mm, which is roughly half-moon-shaped when viewed from above. On the surface of the circular arc portion w, a film f formed of polycarbonate is attached to the surface that presses the diaper 1. The film f is provided on the entire area of ​​the circular arc portion w. In addition, in the side end resistance measuring device 100 of the present embodiment, a chloroprene rubber sponge with a film f disposed on the contact surface with the diaper 1 is used in the one-side pressing member 101 and the other-side pressing member 102, but it is not limited to this. For example, the one side pressing member 101 and the other side pressing member 102 may be formed of vinyl chloride resin or acrylic resin instead of chloroprene rubber sponge. When the one side pressing member 101 and the other side pressing member 102 are formed of vinyl chloride resin or acrylic resin, the film f may not be provided on the contact surface with the diaper 1.

[0102] The one-side pressing member 101 has a shape that is roughly symmetrical with the other-side pressing member 102 relative to the central position CC in the horizontal direction. Specifically, it is a shape obtained by removing a cuboid (a rectangular member) from the central part in the longitudinal direction of the other-side pressing member 102 and inverting it at the central position CC in the horizontal direction. The one-side pressing member 101 has a front pressing member 101a that is closer to the front side than the central position CL in the longitudinal direction and a rear pressing member 101b that is closer to the rear side than the central position CL in the longitudinal direction. The front pressing member 101a has an arc portion wa with a diameter of 150 mm, a straight portion sa1 with a length of 50 mm along the longitudinal direction, and a straight portion sa2 with a length of 40 mm along the horizontal direction. The front pressing member 101a is a member in a roughly 1 / 4 circular shape. The rear pressing member 101b has an arc portion wb with a diameter of 150 mm, a straight portion sb1 with a length of 50 mm along the longitudinal direction, and a straight portion sb2 with a length of 40 mm along the horizontal direction. The rear pressing member 101b is a member of a roughly 1 / 4 circular shape. In addition, the front pressing member 101a and the rear pressing member 101b have a shape symmetrical with respect to the center position CL in the longitudinal direction. The distance between the front pressing member 101a and the rear pressing member 101b, that is, the length in the longitudinal direction between the straight line portion sa2 and the straight line portion sb2 facing each other, is 30 mm. The front pressing member 101a is supported on the base 103 via the support portion ha, and the rear pressing member 101b is supported on the base 103 via the support portion hb. The support portion ha and the support portion hb are respectively rigid rods.

[0103] The base 103 is a member for moving the pressing members 101, 102 and the resistance measuring device 110 laterally on the plane 104. The base 103 is a rectangular member formed of metal (e.g., stainless steel), and is moved to both sides in the lateral direction at a predetermined speed by a motor or the like. By the movement of the base 103, the side end portion of the diaper 1 in the lateral direction is pressed by the load portion tc (described later) and the one-side pressing member 101.

[0104] The resistance measuring device 110 is a device for measuring the resistance value applied to the side end of the diaper 1. As the resistance measuring device 110, a digital force gauge (model: FGP-0.2) manufactured by Nidec Shinpo Co., Ltd. can be used. The resistance measuring device 110 includes a main body ta, a shaft tb, and a load part tc. The load part tc is fixed to the main body ta via the shaft tb. The main body ta measures the load in the load part tc and displays it as a resistance value. The shaft tb is an extension member for extending the distance between the load part tc and the main body ta. The load part tc is a measuring accessory, which is a member for pressing the side end of the diaper 1. The load part tc abuts against the side end of the diaper 1 with a flat surface, and the length T of the abutting surface in the length direction is 30 mm, and the length U in the thickness direction is 50 mm.

[0105] The pressing members 101, 102 and the resistance value measuring device 110 are arranged on the transverse outer side of the central part in the longitudinal direction of the diaper 1 fixed to the flat stand P. The transverse outer side of the central part in the longitudinal direction of the diaper 1 refers to the transverse outer side of the absorbent body 10 in the central part in the longitudinal direction (the crotch part when worn). In the central part in the longitudinal direction of the diaper 1, the one-side pressing member 101 and the resistance value measuring device 110 are arranged on one side of the diaper 1, and the other-side pressing member 102 is arranged on the other side of the diaper 1. At this time, on the other side in the transverse direction, the other-side pressing member 102 is placed on the other-side stand 105 set on the plane 104, and the other-side stand 105 and the other-side pressing member 102 are fixed with a double-sided tape (not shown). At this time, the other-side pressing member 102 is arranged so that the arc portion w is located on the central position CC side in the transverse direction and the straight portion s is located on the other side in the transverse direction, and is arranged so that the vertex of the arc portion w coincides with the central position CL in the longitudinal direction. The resistance measuring device 110 is placed on the base 103 on one side in the lateral direction, and the base 103 and the resistance measuring device 110 are fixed using a metal or resin screw or the like. At this time, the resistance measuring device 110 is arranged so that the center of the top end of the other side in the lateral direction of the load portion tc in the longitudinal direction coincides with the center position CL in the longitudinal direction of the diaper 1. The support parts ha and hb are fixed to the base 103 on one side in the lateral direction by adhesive tape or the like while being placed on the base 103, and the end parts of the support parts ha and hb on the other side in the lateral direction are fixed to the front pressing member 101a and the rear pressing member 101b by adhesive tape or the like, or the support parts ha and hb are inserted and fixed to the front pressing member 101a and the rear pressing member 101b, respectively. In addition, in the case of the front pressing member 101a and the rear pressing member 101b formed of vinyl chloride resin or acrylic resin, the other lateral ends of the support parts ha and hb can be fixed to the front pressing member 101a and the rear pressing member 101b using metal or resin screws.

[0106] And, as the initial position before measurement, as shown in FIG. 7, the arc portion w of the other side pressing member 102 is used to press the other side side end of the diaper 1 from the outside to the inside, so that the lateral length BL from the central position CC to the other side pressing member 102 (the vertex of the arc portion w) is 13.5 mm. Generally speaking, the crotch width of a person is about 42 mm. When the wearer's legs apply force to the inside in the left-right direction, the lower crotch portion of the diaper 1 (the central position CL in the length direction) is shortened to about 27 mm. Therefore, the lateral length BL from the central position CC to the other side pressing member 102 (the vertex of the arc portion w) is 13.5 mm. The load portion tc of the resistance measuring device 110 and the arc portions wa and wb of the one side pressing member 101 are used to press the side end of one side of the diaper 1 from the outside to the inside, so that the lateral length BR from the central position CC to the end of the other side of the load portion tc is 37.5 mm. Since the length BR from the center position CC to the other end of the load portion tc in the lateral direction is 37.5 mm, a state in which no pressure is applied to the side end of the diaper 1 in one lateral direction is achieved.

[0107] After that, from the state of the above-mentioned initial position, as shown in FIG8 , the base 103 is moved 24 mm toward the other side in the lateral direction at a speed of 200 mm / min to become a pressing state. In the pressing state, the load portion tc and the arc portions wa and wb of the one-side pressing member 101 press the side end portion of one side of the diaper 1 toward the other side, so that the lateral length AR from the central position CC to the end portion of the other side of the load portion tc in the lateral direction is 13.5 mm. At the moment when the length AR becomes 13.5 mm, the base 103 moves toward one side in the lateral direction and returns to the state of the initial position. The highest value of the resistance value measured by the resistance measuring device 110 from the state of the initial position through the pressing state and returning to the state of the initial position is obtained as the first resistance value.

[0108] This process of starting from the initial position state, passing through the pressing state and returning to the initial position state is repeated 10 times, and the highest resistance value in each process is taken as the first resistance value to the tenth resistance value. Then, the average value of the first resistance value to the tenth resistance value is calculated, and the average value is the resistance value of the side end resistance test of the central part in the longitudinal direction of the diaper 1.

[0109] The compressive work WC (gf·cm / cm) of the center portion of the diaper 1 in the longitudinal direction relative to the thickness direction in the unfolded state 2 ) and the compression resilience RC (%) described later can be measured by a well-known method.

[0110] For example, the compression work WC (gf cm / cm2 ) and compression rebound resilience RC (%) can be measured using the KES-G5 lightweight compression testing machine manufactured by Kado Technology Co., Ltd. First, a 100mm×100mm portion of the central part of the length direction of the diaper 1 is cut out as a sample. The area enclosed by 50mm to the front and 50mm to the back from the central position CL in the length direction of the diaper 1 and by 50mm to one side and 50mm to the other side from the central position CC in the lateral direction of the diaper 1 is cut out as a sample. Use the upper and lower discs to gently clamp the center of the sample and compress the area (area of ​​the disc) by 2.0cm 2 The thickness dimension T0 of each sample under a load of 0.49 hPa was measured. Next, the sample was compressed at a pressure rate of 1 mm / sec until it reached 50 gf / cm 2 Load, 50gf / cm 2 The thickness dimension Tm under load is measured. In addition, the work required to compress from the thickness dimension T0 to the thickness dimension Tm (gf·m / m 2 ) is set as WC. Furthermore, the amount of work required to restore the thickness dimension Tm to the thickness dimension T0 is set as WC2, and the compression resilience RC (%) is calculated based on the following calculation formula.

[0111] RC(%)=WC2 / WC×100

[0112] In addition, when it is difficult to cut out a portion of 100 mm × 100 mm in the center of the length direction of the diaper 1 as a sample, a portion having the same structure as the center of the length direction of the diaper 1 (the same components overlapped in the thickness direction) and the same basis weight of the absorbent core 11 as the center of the length direction of the diaper 1 may be cut out as a sample. For example, a portion of the center of the diaper 1 in the transverse direction and further to the rear than the center position CL in the length direction may be cut out as a sample. As long as the portion has the same structure as the center of the length direction of the diaper 1 (the same components overlapped in the thickness direction) and the same basis weight of the absorbent core 11 as the center of the length direction of the diaper 1, the same measurement results of the compression work WC and the compression resilience as those of the center of the length direction of the diaper 1 can be obtained. In addition, "thickness (thick)" refers to the thickness measured using a dial-type thickness gauge. As a dial thickness gauge, a dial thickness gauge having a fixed side probe of 50 mm in diameter and a movable side probe of 50 mm in diameter was used, and a pressure of 0.1 N / 100 mm was set. 2 The measuring pressure acts on the movable side probe. As an example of a dial thickness gauge, there is a JB type dial thickness gauge manufactured by Ozaki Manufacturing Co., Ltd.

[0113] Fig. 9 It is a figure which shows each measurement result of diaper 1 and a conventional product. Fig. 9 The diaper 1 in the figure is a shorts-type disposable diaper 1 of the present embodiment. Conventional product A, conventional product B, and conventional product C are conventional shorts-type disposable diapers for adults. Fig. 9 The side end resistance value [N] is the resistance value of the central portion of the diaper 1 and the conventional products A to C in the unfolded state in the longitudinal direction relative to the side end on one side obtained by the above-mentioned side end resistance test. 2 ] is the amount of work done by the central portion of the diaper 1 and the conventional products A to C in the longitudinal direction in the unfolded state obtained by the above-mentioned method for measuring the amount of compression work. Fig. 9 For example, the result of the side edge resistance value of "0.54N" when n is 1 for diaper 1 is the average value of the first to tenth resistance values ​​in the side edge resistance test.

[0114] like Fig. 9 As shown, for the diaper 1 of this embodiment, in all the results, the side end resistance value was 0.9N or less, and the compression work was 4.0gf·cm / cm 2 On the other hand, among the conventional products A, B and C, there are conventional products with a compression work of 4.0 gf·cm / cm 2 The following results were obtained for the products (conventional product C), but the side end resistance values ​​were all greater than 0.9 N. That is, conventional products A to C did not have the characteristics of diaper 1 that the side end resistance value was less than 0.9 N to reduce the hard touch and discomfort from the crotch when worn and the compression work was less than 4.0 gf·cm / cm 2 In the diaper 1 of this embodiment, the rigidity and discomfort felt from the crotch CA of the diaper 1 in the wearing state can be reduced compared with the case where the side end resistance value is larger than 0.9N, and the compression work amount is smaller than 4.0gf·cm / cm 2 Compared with a larger case, the concern that the shape of the diaper 1 (absorbent core 11) may be deformed can be reduced, and the concern that excrement may leak can be reduced.

[0115] In addition, in order to reduce the shape distortion of the crotch CA of the diaper 1, the minimum value of the compression resilience RC (%) of the central part of the diaper 1 in the longitudinal direction relative to the thickness direction in the unfolded state is preferably 35% or more. The closer the value of the compression resilience RC (%) is to 100%, the better the compression recovery. In addition, for those skilled in the art related to absorbent articles, it is known that the larger the value of the compression resilience RC (%), the easier it is to maintain the shape of the absorbent core 11 of the absorbent article (diaper 1), and the more the function and performance of the absorbent core 11 can be exerted.

[0116] Therefore, when the diaper 1 is worn, even when a force is applied to the diaper 1 in the thickness direction, the thickness of the diaper 1 can be easily restored compared to the case where the compression resilience RC of the central portion in the longitudinal direction of the diaper 1 relative to the thickness direction is lower than 35%. When the diaper 1 is worn, the hard touch and discomfort of the crotch CA can be reduced, and the shape of the diaper 1 can be easily maintained, so that the diaper 1 can easily absorb excrement appropriately, and the concern about excrement leakage can be reduced.

[0117] exist Fig. 9 In the above, the compression resilience [%] is the value of the central portion in the longitudinal direction of the diaper 1 and the conventional products A to C in the unfolded state obtained by the above-mentioned compression resilience measurement method. Fig. 9 As shown, for the diaper 1 of this embodiment, the values ​​of compression resilience in all the results are all above 35%. On the other hand, for the conventional products A, B and C, the values ​​of compression resilience in all the results are all less than 35%. Thus, the diaper 1 has excellent compression recovery in the central part in the length direction compared with the conventional products A to C, and the diaper 1 can easily restore the thickness to the force applied in the thickness direction when worn. Thus, compared with the conventional products A to C, the diaper 1 can reduce the hard touch and discomfort of the lower crotch CA when worn, and it is easy to maintain the shape of the diaper 1 (absorbent core 11) when worn, and it is easy to properly absorb excrement, which can reduce the concern of excrement leakage.

[0118] In order to reduce the discomfort of the crotch CA of the diaper 1, the maximum value of the bending rigidity B of the center portion in the longitudinal direction of the diaper 1 in the unfolded state is preferably 4.5 gf·cm 2 / cm or less. The larger the value of the bending rigidity B, the more resistant it is to bending. This can reduce the stiff touch and discomfort of the crotch CA when worn, and the bending rigidity B of the central part in the longitudinal direction of the diaper 1 is 4.5 gf·cm 2 / cm is larger than that of the case where the diaper 1 (absorbent core 11) is easily deformed according to the body and movement of the wearer.

[0119] Bending rigidity B (gf·cm) of the center portion of the diaper 1 in the longitudinal direction in the unfolded state 2 / cm) can be measured by a well-known method. For example, the bending rigidity B (gf·cm 2 / cm) can be measured, for example, using a KES-FB2-L large bending measurement tester manufactured by Kato Technology Co., Ltd. First, a portion of 100mm×100mm in size in the center of the longitudinal direction of the diaper 1 in the unfolded state is cut out as a sample. The sample of this embodiment is cut out in the same way as the sample in the measurement of the above-mentioned compression work WC and compression rebound resilience RC. The sample is fixed between the chucks of the measurement tester so that the sample can be measured in the longitudinal direction of the absorbent. It is carried out in the following manner: bend toward the front side to a maximum curvature of +0.5cm -1 Next, bend toward the back to a maximum curvature of -0.5cm -1 , and then return to its original state. Bending stiffness value B (gf cm 2 / cm) was calculated from the average value of the inclination of the bending moment with respect to the curvature of 0.1 to 0.3 when bending toward the front side and the inclination of the bending moment with respect to the curvature of -0.1 to -0.3 when bending toward the back side.

[0120] exist Fig. 9 In the bending stiffness value B[gf·cm 2 / cm] is the value of the central portion in the longitudinal direction of the diaper 1 and the conventional products A to C in the unfolded state obtained by the above-mentioned bending rigidity measurement method. Fig. 9 As shown, for the diaper 1 of this embodiment, the bending rigidity value B is 4.5 gf·cm in all the results. 2 / cm or less. On the other hand, among the conventional products A, B, and C, there are conventional products having a bending rigidity value B of 4.5 gf·cm 2 / cm or less (conventional product C), but in diaper 1 and conventional products A to C, the side end resistance value is greater than 0.9N and the compression work is 4.0gf·cm / cm 2 Below and the bending stiffness value B is 4.5gf·cm 2 The only product with a thickness of less than 1 cm is diaper 1. According to the results, diaper 1 can easily promote the deformation of the central part (crotch part CA) of the diaper 1 in the longitudinal direction compared with the conventional products A to C, and can reduce the rigidity and discomfort felt from the crotch part CA of the diaper 1 in the wearing state, and can reduce the concern about the shape deformation of the diaper 1 (absorbent core 11), and can reduce the concern about the leakage of excrement.

[0121] In the unfolded state of the diaper 1, it is more preferred that the maximum value of the resistance value of the side end resistance test of the center portion in the longitudinal direction is 0.6N or less, and the maximum value of the compressive work WC of the center portion in the longitudinal direction with respect to the thickness direction is 3.83gf·cm / cm 2 Hereinafter, it is more preferred that the minimum value of the compression resilience RC (%) of the central portion in the length direction relative to the thickness direction is 46% or more. Fig. 9 As shown, for the diaper 1 of this embodiment, in the unfolded state, the maximum value of the resistance value of the side end resistance test of the central portion in the longitudinal direction of the diaper 1 is less than 0.6N, and the maximum value of the compressive work WC of the central portion in the longitudinal direction relative to the thickness direction is 3.83gf·cm / cm 2 The minimum value of the compression resilience RC (%) of the center portion in the length direction relative to the thickness direction is 46% or more. As a result, the rigidity and discomfort of the crotch portion when worn can be reduced compared to the case where the resistance value of the side end resistance test is greater than 0.6N, and the compression work WC is 3.83gf·cm / cm 2 Compared with the case where the compression resilience RC (%) is larger than 46%, it is easier to maintain the shape of the diaper 1 (absorbent core 11). Therefore, it is possible to make a diaper 1 that can appropriately absorb excrement while reducing the discomfort in the crotch when worn and maintaining the shape of the diaper 1.

[0122] As described above, the underpants-type diaper 1 has a waist opening BH (see FIG. Figure 1 ). In the unfolded and stretched state of the pants-type diaper 1, as shown in FIG. Figure 6 As shown, the value obtained by dividing the lateral length W11CL of the absorbent core 11 at the central position CL in the longitudinal direction of the diaper 1 by the lateral length WBH of the front waistline 30 is preferably 15% or more (W11CL / WBH×100≥15%). By designing the structure of the absorbent core 11, the hard touch given to the wearer of the diaper 1 can be reduced, and the rigidity and discomfort felt from the crotch can be reduced. In addition, compared with the case where the value obtained by dividing the lateral length W11CL of the absorbent core 11 at the central position CL in the longitudinal direction of the diaper 1 by the lateral length WBH of the front waistline 30 is less than 15%, the absorbent core 11 can be widely arranged at the lower end of the diaper 1. Therefore, compared with the case where the lateral length of the absorbent core 11 at the lower end of the diaper 1 is narrow, it is easy to absorb excrement and the concern about excrement leakage can be reduced.

[0123] As for the design of the structure of the lower crotch CA of the diaper 1, Figure 6As shown in FIG. 1 and FIG. 2 , in the unfolded and stretched diaper 1, when viewed in the thickness direction, in the crotch portion CA, an overlapping region 75 where the absorbent body 10 and the waist member 20 overlap each other includes an adhesive region 70 and a non-adhesive region 71. Fig.10 is a diagram showing an absorptive body 10 in an enlarged manner, showing an Figure 6 The bonding area 70 and the non-bonding area 71 are shown, and the leakage-proof wall elastic member 16 and other components are omitted. Figure 6 and Fig.10 In FIG. 1 , the adhesive region 70 is indicated by the oblique line portion extending obliquely downward from the left, and the non-adhesive region 71 is indicated by the oblique line portion extending obliquely downward from the right.

[0124] The bonding area 70 is a region where the absorbent body 10 having the absorbent core 11 and the waist member 20 having the front waist portion 30, the rear waist portion 40 and the crotch CA are bonded by an adhesive in the overlapping region 75 where the absorbent body 10 and the waist member 20 overlap when viewed in the thickness direction. The non-bonding region 71 is a region where no adhesive is provided in the overlapping region where the absorbent body 10 and the waist member 20 overlap when viewed in the thickness direction, and is a region obtained by removing the bonding area 70 from the overlapping region. That is, the overlapping region 75 is either the bonding region 70 or the non-bonding region 71.

[0125] The adhesive region 70 is a closed region surrounded by straight lines in the horizontal and vertical directions circumscribing the region to which the adhesive is actually applied. The adhesive in the adhesive region 70 may be applied to the entire surface of the region to be the adhesive region 70 without omission, or may be applied in a well-known application pattern (e.g., a spiral pattern, an Ω pattern, a line pattern, etc.).

[0126] Fig.11 70 is a diagram for explaining the bonding area. Fig.11 In the figure, for convenience, the end (boundary) of the bonding area 70 is indicated by a thick line, and the waist member 20, the back sheet 13 in the absorbent body 10 and other members are omitted. Fig.11 As shown in FIG. 1 , the adhesive 70a is actually applied to the adhesive region 70 of the diaper 1 of the present embodiment in a so-called Ω pattern. A closed region surrounded by a straight line along the lateral direction and a straight line along the vertical direction circumscribing the portion of the adhesive 70a applied in the Ω pattern is referred to as the adhesive region 70. That is, the adhesive region 70 is a region surrounded by a straight line along the lateral direction and a straight line along the vertical direction circumscribing the end of the adhesive 70a. The adhesive region 70 of the present embodiment is in the shape of a Roman numeral 2 (II) with a non-adhesive region 71 provided at both ends and the central portion in the lateral direction in the central portion in the longitudinal direction.

[0127] like Figure 6As shown in the figures, the diaper 1 preferably has a non-adhesive area 71 in the crotch CA when observed in the thickness direction. When the diaper 1 in the unfolded state is observed in the thickness direction, in the overlapping area 75 where the absorbent body 10 overlaps with the waist member 20, the non-adhesive area 71 is less rigid than the adhesive area 70 because the adhesive 70a is not provided. Therefore, by having the non-adhesive area 71 in the crotch CA when observed in the thickness direction, it is easy to reduce the resistance value of the side end resistance test for measuring the resistance value of the side end of the central part in the length direction of the diaper 1 compared with the case where the entire crotch CA is the adhesive area 70. Thus, the rigidity of the crotch CA of the diaper 1 can be reduced without excessively reducing the rigidity of the absorbent core 11, so that the diaper 1 can properly absorb excrement, and the rigidity and discomfort of the crotch CA when wearing the diaper 1 can be reduced.

[0128] Regarding the bonding area 70 and the non-bonding area 71, Figure 6 and Fig.10 As shown, preferably, when observed in the thickness direction, a non-adhesive region 71 is provided at the end in the lateral direction in the overlapping region 75. The non-adhesive region 71 is provided at the end in the lateral direction of the overlapping region 75 in the lower crotch CA. By using the adhesive region 70 provided in the overlapping region 75 to fix the absorbent body 10 to the waist member 20, and by using the non-adhesive region 71 provided at the end in the lateral direction of the lower crotch CA, the rigidity of the lower crotch CA of the diaper 1 can be reduced compared with the case where the non-adhesive region 71 is not provided. Thus, it is easy to reduce the resistance value of the side end resistance test that measures the resistance value of the side end of the central part in the length direction of the diaper 1. That is, the rigidity of the lower crotch CA of the diaper 1 can be reduced without excessively reducing the rigidity of the absorbent core 11, so that the diaper 1 can properly absorb excrement, and the rigidity and discomfort of the lower crotch CA when wearing the diaper 1 can be reduced. Furthermore, in the diaper 1 of the present embodiment, the non-adhesive region 71 is provided over the entire region of the absorbent body 10 in the longitudinal direction and is positioned laterally outward from the adhesive region 70 .

[0129] In the unfolded and stretched diaper 1, the transverse length (W70CR+W70CL) of the adhesive region 70 at the center position CL in the longitudinal direction is preferably less than 1 / 2 (half) of the length W70 of the widest adhesive portion 70M at the transverse length of the adhesive region 70 (W70CR+W70CL≤W70×1 / 2). Fig.10As shown in FIG. 1 and FIG. 2 , the diaper 1 of the present embodiment has a rectangular non-bonded area 71 in the transverse central portion of the crotch CA. Therefore, the transverse length of the bonding area 70 at the central position CL is the sum of the length W70CL of the bonding area 70 on one side of the transverse central position CC and the length W70CL of the bonding area 70 on the other side of the transverse central position CC (W70CR+W70CL). The length W70 of the widest bonding portion 70M, which is the widest in the transverse length of the bonding area 70, is the length W70 of the front end and the rear end of the bonding area 70.

[0130] In order to fix the absorbent body 10 and the waist member 20, it is necessary to ensure the bonding area 70, but the smaller the bonding area 70 is, the more the rigidity of the diaper 1 caused by the adhesive can be reduced. Therefore, by making the lateral length (W70CR+W70CL) of the bonding area 70 at the central position CL in the longitudinal direction of the diaper 1 less than 1 / 2 of the length W70 of the widest bonding part 70M of the bonding area 70, the rigidity of the lower crotch CA can be reduced compared with the case where W70CR+W70CL is longer than 1 / 2 of W70, so it is easy to reduce the resistance value of the side end resistance test for measuring the resistance value of the side end of the central part in the longitudinal direction of the diaper 1. Thus, the rigidity of the lower crotch CA of the diaper 1 can be reduced without excessively reducing the rigidity of the absorbent core 11, so that the diaper 1 can properly absorb excrement and reduce the rigidity and discomfort of the lower crotch CA when wearing the diaper 1.

[0131] In addition, if Fig.10 As shown, in the diaper 1 in the unfolded and stretched state, the transverse length (W70CR+W70CL) of the adhesive region 70 at the central position CL in the longitudinal direction is preferably less than 3 / 4 of the transverse length W11A of the absorbent core 11 (W70CR+W70CL≤W11A×3 / 4). By making the transverse length (W70CR+W70CL) of the adhesive region 70 at the central position CL in the longitudinal direction of the diaper 1 less than 3 / 4 of the transverse length W11A of the absorbent core 11, the rigidity of the lower crotch CA can be reduced compared to the case where W70CR+W70CL is longer than 3 / 4 of W11A. Therefore, it is easy to reduce the resistance value of the side end resistance test for measuring the resistance value of the side end of the central part in the longitudinal direction of the diaper 1. This can reduce the rigidity of the crotch portion CA of the diaper 1 without excessively reducing the rigidity of the absorbent core 11 . Therefore, the diaper 1 can appropriately absorb excrement and reduce the rigidity and discomfort of the crotch portion CA when the diaper 1 is worn.

[0132] In addition, if Fig.10As shown, in the diaper 1 in the unfolded and stretched state, the length L71 of the non-adhesive region 71 in the longitudinal direction is preferably 1 / 2 (half) or more of the length L10 in the longitudinal direction of the absorbent body 10 (L71 ≥ L10×1 / 2). In the diaper 1 of this embodiment, the length L71 of the non-adhesive region 71 in the longitudinal direction is the same as the length L10 in the longitudinal direction of the absorbent body 10 (L71=L10), and L71 is obviously 1 / 2 or more of L10. By making the length L71 of the non-adhesive region 71 in the longitudinal direction 1 / 2 or more of the length L10 in the longitudinal direction of the absorbent body 10, the rigidity of the crotch CA can be reduced compared to the case where L71 is shorter than 1 / 2 of L10. Therefore, it is easy to reduce the resistance value of the side end resistance test for measuring the resistance value of the side end of the central part in the longitudinal direction of the diaper 1. This can reduce the rigidity of the crotch portion CA of the diaper 1 without excessively reducing the rigidity of the absorbent core 11 . Therefore, the diaper 1 can appropriately absorb excrement and reduce the rigidity and discomfort of the crotch portion CA when the diaper 1 is worn.

[0133] Preferably, the skin side piece (outer piece) 21 forming the front waistline 30, the rear waistline 40 and the lower crotch CA of the diaper 1 is not elastic. Simply put, the skin side piece 21 is not an elastic piece. If the skin side piece 21 is an elastic piece, when the skin side piece 21 shrinks, the force of shrinkage will act on the absorbent core 11, and the rigidity of the lower crotch CA may be increased due to the shrinking absorbent core 11. In contrast, by making the skin side piece 21 non-elastic, the worry of excessive shrinkage of the absorbent core 11 can be reduced, and therefore, the worry of the hard touch and discomfort of the lower crotch CA caused by the rigidity of the shrinking absorbent core 11 can be reduced.

[0134] The diaper 1 having the non-stretchable skin side sheets 21 has the deformation guides 50 provided in the absorbent body 10 (absorbent core 11 ), so that the absorbent core 11 can be easily deformed in the thickness direction, thereby improving the followability during walking.

[0135] like Figure 5 As shown in FIG. 1 and FIG. 2 , the deformation guide 50 preferably includes a front deformation guide 51 disposed in a region forward of the center position CL in the front-rear direction, and a rear deformation guide 52 disposed in a region rearward of the center position CL. The front deformation guide 51 and the rear deformation guide 52 are each provided as a pair at intervals in the lateral direction (left-right direction).

[0136] The pair of front deformation guides 51, 51 respectively include a straight portion 511 along the front-rear direction and a front inclined portion 51d inclined with respect to the front-rear direction. Figure 5 As shown, the front inclined portion 51d is a portion that is inclined from the front side to the rear side in the front-to-rear direction and from the outer side to the inner side in the lateral direction. Furthermore, the point where the inclination of the front deformation guide portion 51 starts is set as the inclination starting point 51ds, and the point that is located at the rear side of the inclination starting point 51ds and ends is set as the inclination ending point 51de. The front inclined portion 51d can be formed in a straight line or a curved line between the inclination starting point 51ds and the inclination ending point 51de. In addition, the straight line portion 51l may not necessarily be provided in the front deformation guide portion 51, and a part of the front deformation guide portion 51 may have a discontinuous portion.

[0137] Similarly, the pair of rear deformation guides 52, 52 also respectively have a straight portion 52l along the front-to-back direction and a rear inclined portion 52d inclined relative to the front-to-back direction. The rear inclined portion 52d is a portion that is inclined from the rear side in the front-to-back direction to the front side and from the outside in the lateral direction to the inside. The point where the inclination of the rear deformation guide 52 starts is set as the inclination starting point 52ds, and the point that is located at a position more forward than the inclination starting point 52ds and ends is set as the inclination ending point 52de. The rear inclined portion 52d can be formed in a straight line or a curve between the inclination starting point 52ds and the inclination ending point 52de. In addition, the straight line portion 52l may not be provided in the rear deformation guide 52, and a part of the rear deformation guide 52 may have a discontinuous portion.

[0138] In addition, the front deformation guide portion 51 and the rear deformation guide portion 52 are respectively provided with a plurality of transversely extending long portions 51w and 52w (see Figure 5 For example, by providing the lateral long portion 51w in the front deformation guide portion 51 so as to intersect the straight portion 521 and the front inclined portion 51d, the absorbent core 11 can be easily deformed flexibly and the excretion such as urine absorbed can be easily diffused in the lateral direction.

[0139] When worn, the front deformation guide 51 is arranged along the wearer's groin, and the rear deformation guide 52 is arranged along the wearer's buttocks. In this state, when the wearer moves the legs forward and backward due to walking, the absorbent core 11 is bent and deformed in the thickness direction along the front deformation guide 51 and the rear deformation guide 52, and is less likely to interfere with the movement of the legs. Fig. 12A This is a diagram for explaining how the absorbent body deforms when a person walks while wearing a conventional pants-type diaper as a comparative example. Fig. 12B The diagram is a diagram for explaining how the absorbent body 10 is deformed when walking while wearing the diaper 1 according to the present embodiment.

[0140] In conventional pants-type diapers, if the wearer extends one leg forward while walking, the rigid absorbent core interferes with the leg, which can easily cause discomfort. For example, since the absorbent core has difficulty following the movement of the walker's legs, the edge (edge ​​portion) of the absorbent body (absorbent core) may hit the groin area, which can easily cause stiffness and tightness in the groin area (see Fig. 12A ).

[0141] In contrast, in the diaper 1 of the present embodiment, when the wearer extends one leg forward while walking, the absorbent core 11 is deformed in a manner that is bent in the thickness direction along the groin region with the front deformation guide 51 as the starting point. That is, the absorbent core 11 is easy to deform freely following the movement of the wearer's legs when walking, etc., and the edge of the absorbent core 11 can be prevented from colliding with the groin region or interfering with the movement of the legs. As a result, the resistance value of the side end resistance test that measures the resistance value of the side end of the central part in the longitudinal direction of the diaper 1 can be easily reduced, and the rigidity and discomfort of the lower crotch CA when the diaper 1 is worn can be reduced.

[0142] In particular, in the pants-type diaper 1 as in the present embodiment, the inclination starting point 51ds of the front deformation guide portion 51 is located at a position forward of the rear end of the front waistline portion 30 in the front-back direction (at the position of Figure 6 B is a position higher than the lower end 30b of the side joint 20s in the vertical direction). Since the wearer's groin usually extends along the base of the leg to the upper side of the hip joint, the inclination starting point 51ds is located at a position higher than the rear end 30b of the front waistline 30 (a position higher than the lower end), so that the position of the front inclined portion 51d is difficult to deviate from the position of the groin in the front-to-back direction (upper and lower direction). In addition, the end of the absorbent body 10 (absorbent core 11) deformed by the front deformation guide 51 is brought into contact with the groin, so that the position of the absorbent body 10 is difficult to deviate. As a result, the absorbent core 11 is easily deformed along the groin following the movement of the leg.

[0143] In addition, in the pair of front deformation guides 51, 51, the inclination end points 51de are separated from each other in the lateral direction (left-right direction). That is, the pair of front deformation guides 51, 51 are independently provided. Therefore, the deformation of the absorbent core 11 guided by the front deformation guide 51 on one side (for example, the left side) in the lateral direction is not easily affected by the deformation of the absorbent core 11 guided by the front deformation guide 51 on the other side (for example, the right side) in the lateral direction. As a result, when the two legs are moved forward and backward during walking, the absorbent core 11 is easily deformed following the movement of the left and right groin parts.

[0144] Thus, in the diaper 1, by utilizing the front deformation guide 51 provided in the absorbent core 11, even when the wearer walks while wearing the diaper 1, the absorbent core 11 can easily deform freely following the movement of the legs. Therefore, it is possible to prevent the groin area from feeling uncomfortable during walking, and to reduce the worry of making the wearer feel stiff and causing discomfort to the wearer.

[0145] In addition, similarly to the front deformation guide 51, in the pair of rear deformation guides 52, 52, the inclination end points 52de are separated from each other in the lateral direction (left-right direction). Therefore, the deformation of the absorbent core 11 guided by the rear deformation guide 52 on one side in the lateral direction (left-right direction) is less likely to be affected by the deformation of the absorbent core 11 guided by the rear deformation guide 52 on the other side in the lateral direction (left-right direction). As a result, when the legs are moved forward and backward during walking, the absorbent core 11 is easily deformed following the movement of the left and right hips, which makes it difficult for the groin area to feel uncomfortable during walking, and can reduce the worry of making the wearer feel rigid and causing discomfort to the wearer.

[0146] In addition, the absorbent core 11 is provided with a narrowed portion 11c that narrows from the outside to the inside in the lateral direction. It is desirable that the narrowed portion 11c and the front inclined portion 51d have a portion overlapping in the front-back direction. Figure 5 In the embodiment of the present invention, the front narrowing portion 11c1 formed at a position forward of the central position CL in the front-back direction overlaps a portion of the front inclined portion 51d in the front-back direction. In the front narrowing portion 11c1, since the width of the absorbent core 11 in the lateral direction is narrowed, the absorbent core 11 is unlikely to interfere with the legs of the wearer when walking. Moreover, since the front inclined portion 51d is provided overlapping with the front narrowing portion 11c1, the absorbent core 11 is likely to deform along the front inclined portion 51d at the narrowed front narrowing portion 11c1. Therefore, when walking in a state where the diaper 1 is worn, the absorbent core 11 is unlikely to interfere with the legs and groin of the wearer and is likely to deform, which can further make it difficult for the wearer to feel uncomfortable.

[0147] Furthermore, it is preferred that the absorbent core 11 has a crotch wide width portion 11D in the crotch portion CA at a position closer to the inside than the narrowed portion 11c in the longitudinal direction. Fig.10As shown in the figures, the transverse length W11D of the crotch wide portion 11D is preferably longer than the length W11c2 of the shortest transverse length portion of the narrowing portion 11c (W11D>W11c). In the diaper 1 of the present embodiment, the transverse length of the shortest transverse length portion of the rear narrowing portion 11c2 is shorter than the shortest transverse length portion of the front narrowing portion 11c1. By providing the narrowing portion 11c, the absorbent core 11 can be easily deformed according to the shape and movement of the wearer's body, and by providing the crotch wide portion 11D, excrement can be easily and appropriately absorbed, thereby reducing discomfort during wearing and reducing the concern about excrement leakage.

[0148] In this embodiment, non-adhesive regions 71 are provided at the central portion in the longitudinal direction of the overlap region 75, at both ends and at the central portion in the lateral direction, and the adhesive region 70 is substantially in the shape of the Roman numeral 2 (II), but the present invention is not limited thereto. The adhesive region 70 and the non-adhesive region 71 can be set arbitrarily. For example, Fig.13 As shown, the non-bonding area 71 may be provided at the central portion in the longitudinal direction of the overlapping area 75 and at both ends in the lateral direction, and the bonding area 70 may be substantially in the shape of a Roman numeral I. Fig.13 It is a diagram for explaining a modified example of the adhesion region 70 .

[0149] exist Fig.13 In the absorbent body 10 shown, the absorbent core 11 of the diaper 1 may have a slit 60 (low unit area weight portion) along the vertical direction, and when the diaper 1 is observed in the thickness direction, there is a portion where the slit 60 overlaps with the adhesive region 70. When observed in the thickness direction, the portion of the adhesive region 70 that overlaps with the slit 60 can reduce the rigidity of the crotch portion CA of the diaper 1. Therefore, it is easy to reduce the resistance value of the side end resistance test that measures the resistance value of the side end of the central portion in the longitudinal direction of the diaper 1, and the rigidity and discomfort of the crotch portion CA when the diaper 1 is worn can be reduced.

[0150] The diaper 1 of the present embodiment is a pants-type disposable diaper 1, but the absorbent article of the present invention may be a belt-type disposable diaper 2 (hereinafter also referred to as a "diaper 2") as shown in FIG. 14 . Fig.14A It is a top view of the diaper 2 in the unfolded and stretched state.

[0151] Fig. 14B yes Fig.14A A schematic cross-sectional view taken along line DD of FIG. Fig.14A and Fig. 14B The directions in are the same as those described in the first embodiment.

[0152] The diaper 2 includes an absorbent body 10, a waist member 20, a fastening belt 80, and a target belt 90. The absorbent body 10 of the diaper 2 has a substantially similar structure to the absorbent body 10 of the diaper 1 of the above-mentioned embodiment, and includes an absorbent core 11, a top sheet 12, and a back sheet 13 (liquid-impermeable sheet 13a). The absorbent core 11 is provided with deformation guides 50 (front deformation guide 51, rear deformation guide 52) similar to those of the diaper 1.

[0153] The waist member 20 has a double-layer structure including a skin side sheet 21 substantially the same as the skin side sheet 21 of the diaper 1 of the first embodiment and a non-skin side sheet 22 corresponding to the non-skin side sheets 32, 42 of the diaper 1. Furthermore, the absorbent body 10 is held so as to be sandwiched between the skin side sheet 21 and the non-skin side sheet 22 in the thickness direction. In addition, in the diaper 2, in the area of ​​the waist member 20 that is closer to the front side than the center position CL in the front-to-back direction, the portion with the largest lateral width is set as the front waist portion 30. Similarly, in the area of ​​the waist member 20 that is closer to the back side than the center position CL in the front-to-back direction, the portion with the largest lateral width is set as the rear waist portion 40. Furthermore, the area between the front waist portion 30 and the rear waist portion 40 in the front-to-back direction is set as the crotch portion CA (refer to Fig. 8A ).

[0154] A pair of fastening belts 80 are provided so as to extend from the rear waistline portion 40 to both outer sides in the lateral direction. The fastening belt 80 has a belt base 81 and a snap-fitting member 82 provided on the skin side in the thickness direction of the belt base 81. The snap-fitting member 82 is a sheet-like member provided with a plurality of small hooks protruding in the thickness direction, and for example, a hook-and-loop fastener or the like can be applied. By making the snap-fitting members 82, 82 provided on the pair of fastening belts 80, 80 respectively snap-fit ​​with the target belt 90 described later, the waist opening BH and a pair of leg openings LH, LH of the diaper 2 can be formed, and the position of the diaper 2 can be fixed relative to the body (trunk) of the wearer.

[0155] The target belt 90 is a sheet member provided on the non-skin side (non-skin side sheet 22) of the front waistline portion 30, and is formed of, for example, nonwoven fabric. A plurality of loops that can engage with the engaging members 82 of the fastening belt 80 are provided on the surface of the non-skin side of the target belt 90, and the two are engaged by hooking the hooks of the engaging members 82 on the loops of the target belt 90. Alternatively, the hooks may be provided on the target belt 90 side, and the loops may be provided on the fastening belt 80 side.

[0156] In the unfolded state, the maximum value of the resistance value of the side end resistance test of the central portion in the longitudinal direction of the diaper 2 is 0.9N or less, and the maximum value of the compressive work WC of the central portion in the longitudinal direction of the diaper 2 relative to the thickness direction is 4.0gf·cm / cm 2The resistance value and the compressive work WC of the side end resistance test can be measured by the same method as that of the diaper 1 .

[0157] In the diaper 2, by making the maximum value of the resistance value of the side end resistance test less than 0.9N, the crotch portion of the diaper 2 can be made softer than when the resistance value of the side end resistance test of the central portion in the longitudinal direction of the absorbent article is greater than 0.9N, thereby reducing the stiff wearing feeling and discomfort caused by the rigidity of the crotch portion of the wearer of the diaper 2. In addition, by making the maximum value of the resistance value of the side end resistance test less than 0.9N, and making the compressive work WC of the central portion in the longitudinal direction of the diaper 2 relative to the thickness direction less than 4.0gf·cm / cm 2 The thickness of the diaper 1 in the crotch portion can be reduced by reducing the change in thickness of the diaper 1 in response to the force in the thickness direction. That is, the deformation of the absorbent core 11 in the crotch portion can be reduced in response to the force in the thickness direction.

[0158] The inclination starting point 51ds of the front deformation guide portion 51 is located at a position on the front side relative to the rear end 30b of the front waistline portion 30 in the front-to-back direction (see Fig.14A ). Therefore, when the diaper 2 is worn, the front deformation guide 51 is arranged at a position along the groin of the wearer. And when walking, the absorbent core 11 easily follows the movement of the wearer's legs and deforms along the groin.

[0159] In addition, in the pair of front deformation guides 51, 51, the inclination end points 51de are separated from each other in the lateral direction (left-right direction). Therefore, the deformation of the absorbent core 11 guided by the front deformation guide 51 on one side in the lateral direction (left-right direction) is less likely to be affected by the deformation of the absorbent core 11 guided by the front deformation guide 51 on the other side in the lateral direction (left-right direction). As a result, when the legs move forward and backward during walking, the absorbent core 11 is easily deformed following the movement of the left and right groin parts.

[0160] Thus, by utilizing the front deformation guide 51 provided on the absorbent core 11, even when the wearer walks while wearing the diaper 2, the absorbent core 11 can easily deform freely following the movement of the legs. Therefore, in the diaper 2, similarly to the diaper 1, it is possible to prevent the groin from feeling uncomfortable during walking.

[0161] In addition, the structure demonstrated with respect to the diaper 1 can also be applied to the diaper 2.

[0162] ===Other Implementation Methods===

[0163] Above, the embodiments of the present invention have been described, but the above embodiments are used to make the understanding of the present invention easy, and are not used to interpret the present invention in a limiting manner. In addition, the present invention can certainly be changed and improved without departing from its purpose, and its equivalents are included in the present invention.

[0164] Description of Reference Numerals

[0165] 1. Diapers (disposable shorts diapers, absorbent articles),

[0166] 2 diapers (disposable diapers with belt),

[0167] 10 Absorbent body,

[0168] 11 absorbent core, 11b core wrapping sheet,

[0169] 11c narrowing part, 11c1 narrowing part, 11c2 narrowing part,

[0170] 12 top sheet,

[0171] 13 back piece,

[0172] 13a liquid-impermeable sheet (breathable membrane), 13b non-skin side sheet,

[0173] 15 leakage prevention wall portion, 16 leakage prevention wall elastic member,

[0174] 20 waist member (outer body),

[0175] 20s side joint,

[0176] 21 skin side sheet (outer sheet),

[0177] 30 front waistline,

[0178] 30b end (rear side, lower side),

[0179] 32 non-skin side piece, 32f fold back,

[0180] 35 waist elastic component, 37 leg elastic component,

[0181] 40 rear waistline,

[0182] 42 non-skin side pieces,

[0183] 45 waist elastic member, 47 leg elastic member,

[0184] 46 hip cover,

[0185] 50 deformation guide part,

[0186] 51 front deformation guide portion,

[0187] 51d front side tilt part, 51ds tilt start point, 51de tilt end point,

[0188] 51l straight part, 51w horizontal part,

[0189] 52 rear deformation guide portion,

[0190] 52d rear side tilt part, 52ds tilt start point, 52de tilt end point,

[0191] 52l straight part, 52w horizontal part,

[0192] 60 slits,

[0193] 70 bonding area,

[0194] 71 non-bonding area,

[0195] 80 fastening belt,

[0196] 81 belt base, 82 engaging member,

[0197] 90 target belt,

[0198] 100 side end resistance measuring device,

[0199] 101 one side pressing member,

[0200] 102 the other side pressing member,

[0201] 103 base,

[0202] 106 double-sided tape,

[0203] 110 Resistance measuring device,

[0204] BH waist opening, LH leg opening,

[0205] CA inseam,

[0206] CL center position (front-back direction).

Claims

1. An absorbent article having an up-down direction, a lateral direction and a front-back direction intersecting each other, The absorbent article comprises a liquid-absorbent absorbent core. The absorbent article has a front waistline portion located at the front side, a rear waistline portion located at the rear side, and a crotch portion located between the front waistline portion and the rear waistline portion in the front-to-back direction, characterized in that: In the unfolded state, the length direction of the absorbent core is along the up-down direction. In a side end resistance test for measuring the resistance value relative to the side end of the absorbent article in the unfolded state, the maximum value of the resistance value of the side end resistance test at the center portion in the longitudinal direction of the absorbent article is 0.9N or less, and, The maximum value of the compressive work WC of the central portion in the longitudinal direction of the absorbent article with respect to the thickness direction of the absorbent core is 4.0 gf·cm / cm 2 the following.

2. The absorbent article according to claim 1, wherein The minimum value of the compression resilience RC of the central portion in the longitudinal direction of the absorbent article with respect to the thickness direction is 35% or more.

3. The absorbent article according to claim 1 or 2, characterized in that: The maximum value of the bending rigidity B of the central portion in the longitudinal direction of the absorbent article is 4.5 gf·cm 2 / cm or less.

4. The absorbent article according to claim 1 or 2, characterized in that: The maximum value of the resistance value of the side end resistance test of the central part in the longitudinal direction of the absorbent article is 0.6N or less, The maximum value of the compressive work WC of the central portion in the longitudinal direction of the absorbent article with respect to the thickness direction is 3.83 gf·cm / cm 2 The following, and The minimum value of the compression resilience RC of the central portion in the longitudinal direction of the absorbent article is 46% or more.

5. The absorbent article according to claim 1 or 2, characterized in that: In the stretched state, a value obtained by dividing the transverse length of the absorbent core at the center position in the longitudinal direction of the absorbent article by the transverse length of the upper end of the front waistline portion is 15% or more.

6. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has: an absorbent body including the absorbent core; and an outer body, the outer body comprising the front waistline portion, the rear waistline portion and the crotch portion, In the unfolded and extended state, The absorbent body and the outer body are fixed in an adhesive region coated with an adhesive. When viewed in the thickness direction, the crotch portion has a non-adhesive region where the adhesive is not provided in an overlapping region where the absorbent body and the outer body overlap.

7. The absorbent article according to claim 6, wherein: When viewed in the thickness direction, the non-bonded region is provided at an end portion in the lateral direction in the overlapping region.

8. The absorbent article according to claim 6, wherein: In the unfolded and extended state, The length in the lateral direction of the adhesive region at the center position in the longitudinal direction of the absorbent article is equal to or less than 1 / 2 of the length of the widest adhesive portion where the length in the lateral direction of the adhesive region is the widest.

9. The absorbent article according to claim 6, wherein: In the unfolded and extended state, The length in the lateral direction of the adhesive region at the center position in the longitudinal direction of the absorbent article is 3 / 4 or less of the length in the lateral direction of the absorbent core.

10. The absorbent article according to claim 6, wherein: In the unfolded and extended state, The length of the non-adhesive region in the longitudinal direction is equal to or greater than 1 / 2 of the length of the absorbent body in the longitudinal direction.

11. The absorbent article according to claim 6, wherein The absorbent core has a low basis weight portion along the up-down direction, When viewed in the thickness direction, there is a portion where the low basis weight portion overlaps the adhesion region.

12. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has an outer sheet forming the front waistline portion, the rear waistline portion, and the crotch portion. The exterior sheet has no stretchability.

13. The absorbent article according to claim 12, wherein: In the unfolded and extended state, A pair of front deformation guides are provided along the lateral direction at positions forward of the center position in the longitudinal direction, the front deformation guides guiding the absorbent core to deform in the thickness direction. The pair of front deformation guides respectively have front inclined portions inclined from the front side to the rear side in the longitudinal direction and inclined from the outer side to the inner side in the lateral direction. The pair of front deformation guides each have an inclination start point where inclination starts and an inclination end point where inclination ends and is located at a position rearward of the inclination start point. The inclination start point is located in the longitudinal direction at a position forward of the rear end of the front waistline portion. The tilt end points are spaced apart from each other in the lateral direction.

14. The absorbent article according to claim 13, wherein A pair of rear deformation guides are provided along the lateral direction at positions rearward of the center position in the longitudinal direction, the rear deformation guides guiding the absorbent core to deform in the thickness direction. The pair of rear deformation guides each have a rear inclined portion that is inclined from the rear side to the front side in the longitudinal direction and from the outer side to the inner side in the lateral direction. The pair of rear deformation guides each have an inclination start point where inclination starts and an inclination end point located forward of the inclination start point and where inclination ends. The tilt end points are spaced apart from each other in the lateral direction.

15. The absorbent article according to claim 13, wherein The absorbent core has a narrowed portion in the crotch portion that narrows from the outside to the inside in the transverse direction. There is a portion in the longitudinal direction where the front inclined portion overlaps with the narrowed portion.

16. The absorbent article according to claim 15, characterized in that In the crotch portion, the absorbent core includes a crotch wide portion located on the inner side of the narrowed portion in the longitudinal direction. The length of the wide crotch portion in the transverse direction is longer than a portion of the narrowed portion where the length of the narrowed portion in the transverse direction is the shortest.

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