JP6030933B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, it is an open type diaper comprising an absorbent body and a side flap extending outward in the width direction from the absorbent body, and a main elastic material is disposed outside the product width direction from the absorbent body. Further, there is disclosed a diaper in which a secondary elastic material is disposed on the outer side in the product width direction. Further, a fastening member for fastening the widthwise outer end of the rear waistline region to the front waistline region is provided on the outer side in the width direction than the side flaps (for example, Patent Document 1, FIG. 1). , FIG. 2, pages 4 to 5).

  The main elastic material is arrange | positioned around a wearer's leg. The auxiliary elastic material is disposed on the outer side in the product width direction than the main elastic material in the vicinity of the longitudinal direction end of the disposable diaper. The side part in the product width direction of the diaper is contracted by the secondary elastic material, and side leakage such as urine can be prevented.

Japanese Utility Model Publication No. 2-96118

  However, the disposable diaper described above has the following problems.

  The wearer's body is not symmetrical in the front-rear direction, and the buttocks located on the dorsal side is longer than the ventral side. Conventional diapers are intended to cover the wearer's body with side flaps that extend outward in the width direction from the absorbent body. However, the front waistline and the back of the wearer are arranged on the stomach side of the wearer. The rear waistline region arranged on the side is symmetrical. The conventional diaper is not based on the wearer's characteristics, the portion covering the buttock is small, and the front and rear side flaps are also symmetrical in the front-rear direction. If an expansion / contraction member is inserted in this state, the part which covers a collar part by shrinkage will become small, and cannot be covered. Therefore, the conventional diaper is difficult to be disposed along the body line.

  When wearing an open diaper, place a disposable diaper below the wearer so that the center of the leg opening is aligned with the center of the crotch of the wearer, and wrap the buttocks around the rear waist area. While pulling the fastening member toward the front waistline, the diaper is fixed around the waist of the wearer by the fastening member.

  Thus, when the disposable diaper is worn, the rear waistline region corresponding to the wearer's buttocks side is pulled. Specifically, the area of the side flaps in contact with the buttocks is insufficient, the side flaps are arranged inwardly (in the wearer's body side) in a convex shape, and the side flaps are stretched. Therefore, the rear waistline region may be shifted to the crotch side, and it may be difficult to raise and lower the legs.

  In addition, when the side flap is pulled, the secondary elastic material is difficult to contract, and the secondary elastic material cannot fully exhibit the contracting function.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the disposable diaper which can suppress the shift | offset | difference of the back waistline area which covers a hip part, maintaining the fit property of a leg periphery. And

  A disposable diaper according to the present disclosure (disposable diaper 10) has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the rear waistline region, and from the front waistline region An absorber having a product longitudinal direction toward the rear waistline and a product width direction orthogonal to the product longitudinal direction, straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region A side flap that straddles the front waistline region, the crotch region, and the rear waistline region and that is disposed on the outer side in the product width direction than the absorber, and a product width direction from the rear waistline region of the side flap A pair of fastening tapes extending outward and fastened to the front waistline region, the side flaps having leg openings recessed toward the center of the absorbent body in the product width direction; A leg expansion / contraction part that is disposed on the inner side in the product width direction than the leg opening and that expands / contracts in the product longitudinal direction is formed, and the leg opening extends from the product longitudinal center of the leg opening. A rear leg opening positioned rearward, and a front leg opening positioned forward of the product longitudinal center of the leg opening, the rear leg opening, and the product width The area between the straight line passing through the center in the direction and parallel to the product longitudinal direction is wider than the area between the front leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction, A flange expansion / contraction part that is disposed across the crotch region and the rear waistline region and extends / contracts in the product longitudinal direction is disposed on the outer side in the product width direction than the leg expansion / contraction part. rate Is higher than the elongation rate of the leg stretchable part.

  According to the disposable diaper according to the present disclosure, it is possible to provide a disposable diaper that can suppress the shift of the rear waistline region that covers the buttocks while maintaining the fit around the legs.

It is an expanded top view of the disposable diaper concerning this embodiment. It is sectional drawing of the disposable diaper along the F1-F1 line | wire shown in FIG. It is sectional drawing of the disposable diaper along the F2-F2 line | wire shown in FIG. It is a figure which shows the state which mounted | wore the wearer with the disposable diaper which concerns on this embodiment.

  Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

(1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG. The developed plan view shown in FIG. 1 shows a state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the folds such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not formed. It is.

  The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a rear waistline region 30. The front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion). Further, the rear waistline region 30 is a portion in contact with the rear waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the back waistline region 30.

  In the present embodiment, a direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.

  The disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30. The absorber 40 includes an absorbent core 40a and a core wrap 40b.

  The absorbent core 40a is the same as a conventional disposable diaper, and can be appropriately configured using a known member or material such as pulverized pulp or a superabsorbent polymer. The absorbent core 40a is wrapped with a sheet-like core wrap 40b.

The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part on the skin surface side of the core wrap 40b is constituted by various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, air-through nonwoven fabric of weight approximately 10 to 30 g / m ^2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet mass about 10 to 30 g / m ^2,.

  A liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back side (non-skin contact surface side) of the absorber 40. An exterior sheet 60 is provided on the back surface side (non-skin contact surface side) of the back sheet 60a.

  Side flaps 70 are respectively provided on the side edges of the absorbent body 40 in the product width direction W. The side flap 70 straddles the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed outside the absorbent body 40 in the product width direction. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.

  A pair of leg openings 35 are formed in the side flap 70 of the disposable diaper 10. The leg opening 35 is provided at a side end portion in the product width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer while the disposable diaper is worn by the wearer. The leg opening 35 is recessed toward the center of the absorbent main body in the product width direction.

  The leg opening 35 includes a rear leg opening 35R positioned rearward of the product longitudinal center O4 of the leg opening 35 and a front leg opening positioned forward of the product longitudinal center O4 of the leg opening 35. 35F. The area between the rear leg opening 35R and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product leg direction through the front leg opening 35F and the center in the product width direction. It is wider than the area between the straight lines. The area is the area of the stretched state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the wrinkles such as the top sheet 50 and the side flap 70 constituting the disposable diaper are not visually observable. is there.

  The pair of side flaps 70 are each provided with a fastening tape 90. The fastening tape 90 extends along the product width direction W in the rear waistline region 30, and is fastened to the non-skin contact surface of the front waistline region 20, thereby holding the disposable diaper 10 on the wearer's body.

  The target portion 95 is disposed on the non-skin contact surface in the front waistline region, and is configured so that the pair of fastening tapes 90 are respectively fastened.

  In the present embodiment, the front waistline region 20, the rear waistline region 30, and the fastening tape 90 constitute a waistline holding portion. The waistline holding portion of the rear waistline region 30 is a range extending in the product width direction from the region where the engaging portion of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 20 is a range extending in the product width direction from the region where the target portion 95 is provided.

  Further, the disposable diaper 10 includes a crotch expansion / contraction part 200 disposed in a region overlapping the absorber in the crotch region 25. The configuration of the crotch expansion / contraction unit 200 will be described in detail later.

  The side flap 70 is provided with a pair of leg stretchable parts 75 that are disposed on the inner side in the product width direction than the leg opening 35 and can be stretched in the product longitudinal direction L.

  The leg stretchable part 75 is longer than the crotch stretchable part 200 in the product longitudinal direction L, and is provided outside the crotch stretchable part 200 in the product width direction W.

  The leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a product longitudinal direction, may be arrange | positioned along the leg opening part 35, and one part is with respect to the leg opening part 35. And may be arranged in an inclined state.

  Further, on the outer side in the product width direction than the leg stretchable part 75, a buttock stretchable part 77 that is disposed across the crotch region 25 and the rear waistline region 30 and that stretches in the product longitudinal direction is disposed.

  The leg stretchable portion 75 and the heel stretchable portion 77 are portions that contract substantially in the longitudinal direction of the product with thread rubber or the like, and are a concept that excludes the portion where the stretchable sheet is disposed in a state where the contraction force is not exerted. . The configuration of the leg stretchable part 75 and the heel stretchable part 77 will be described in detail later.

  A pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction, and are erecting and expanding gathers disposed on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 are arranged on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be formed of a sheet material different from the side flaps 70.

  Further, between the pair of fastening tapes in the product width direction, a waist stretchable portion 85 that can be stretched in the product width direction is provided. The waist elastic part 85 contracts between the fastening tapes in the product width direction.

  In the present embodiment, the waist elastic part 85 is constituted by an elastic sheet. The members constituting the waist elastic part 85 are not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width ratio. By configuring the waist stretchable portion 85 with a material having low bending rigidity, the waist stretchable portion 85 can easily bend along the body, and the waist stretchable portion 85 is placed along the body without applying a load to the wearer's body. Can be fitted. Further, by configuring the waist stretchable portion 85 with a material having a small width, the contraction of the disposable diaper in the product longitudinal direction when the disposable diaper extends in the product width direction is suppressed, and the disposable diaper is placed around the wearer's waist Can be prevented from being pulled down to the crotch side.

In the present embodiment, a stretchable film having a basis weight of 20 to 45 g / m ² is used as the waist stretchable portion 85.

  The waist stretchable portion 85 is stretched by 1.5 to 2.5 times the length in the non-stretched state (natural state), and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment. .

  In the present embodiment, the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist stretchable portion 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. It may be. The position of the waist elastic part is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.

  In addition, although the waist stretchable part according to the present embodiment is configured to stretch in the product width direction, the waist stretchable part may be configured to stretch in the product width direction and the product longitudinal direction. .

  The fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 is provided with a base sheet 91 connected to the side flap 70, an engagement hook (not shown) as a plurality of engagement members, and a hook sheet 92 fixed to the base sheet 91; Is provided. The hook sheet 92 is an area where an engagement member is provided, and the above-described waistline holding portion is an area extending from the hook sheet 92 in the product width direction.

  The hook sheet 92 is fixed to the base sheet 91, specifically, joined. The hook sheet 92 and the base sheet 91 are preferably joined so that the rigidity of the fastening tape 90 does not become higher than necessary. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive applied intermittently such as a dot shape, a line shape, or a spiral shape. The hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.

The base sheet 91 is composed of one or two or more non-woven fabrics stacked. As the base material sheet 91, a nonwoven fabric produced by a production method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used. The basis weight of the nonwoven fabric constituting the base sheet 91 (total basis weight in the case of a plurality of sheets) is 30 to 120 g / m ² , preferably 40 to 90 g / m ² .

  The target portion 95 is provided on the surface on the non-skin contact side of the exterior sheet 60 in the front waistline region. The target portion 95 is configured so that the engaging hook of the fastening tape is hooked, and functions as a loop of a hook and loop locking system. As the target portion, for example, an air-through nonwoven fabric can be used.

  As the target portion 95, for example, a fiber nonwoven fabric made from a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used. Further, the loop attached to the target portion can be formed of a polyolefin-based thermoplastic synthetic resin.

  Furthermore, as the target portion 95, a non-woven fabric which is a bulky non-woven fabric and which is partly embossed to prevent fluffing on the non-woven fabric surface may be used.

  Further, the exterior sheet 60 of the disposable diaper is formed of non-woven fabric, and the design indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the non-skin contact side surface of the exterior sheet 60, or the design sheet is printed on the back sheet. It can also be set as the target portion by arranging it on the non-skin contact side of 60a or the exterior sheet 60.

  Further, the area between the rear leg opening and the straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is parallel to the product longitudinal direction through the front leg opening and the center in the product width direction. It is wider than the area between the straight line L1. Therefore, the side flap located behind the product longitudinal center of the leg opening extends outward in the product width direction from the side flap located forward of the product longitudinal center of the leg opening, The area that can be covered is wide.

  The straight line L1 passing through the center in the product width direction and parallel to the product longitudinal direction is a straight line L1 passing through the center in the product width direction of the disposable diaper and parallel to the product longitudinal direction.

  The wearer's body is not symmetric in the front-rear direction and has a larger surface area on the back side than on the abdominal side. This is because the back side of the wearer has a buttocks that swell outward. Moreover, in the state in which the wearer wears the disposable diaper, the product longitudinal center O4 of the leg opening is likely to be a position corresponding to the product longitudinal center of the wearer's crotch. For example, the area between the rear leg opening located behind the product longitudinal center of the leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction is the product longitudinal direction of the leg opening. The same area as the area between the front leg opening located in front of the center and a straight line passing through the center in the product width direction and parallel to the product longitudinal direction, or the product passing through the rear leg opening and the center in the product width direction. If the area between the straight line parallel to the longitudinal direction is less than the area between the front leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction, the body that is asymmetrical in the longitudinal direction is covered. Disposable diapers cannot be placed on the back of the wearer, and the diaper is stretched on the back side of the wearer, or on the abdomen of the wearer.

  When the side flaps 70 are stretched on the back side of the wearer, the leg opening 35 on the side of the rear waist region is turned up toward the inner side in the product width direction while being worn, and the buttocks of the wearer are exposed. Sometimes. In addition, since there is not enough area to cover the buttocks on the side flaps on the back waistline side, the product width direction end of the back waistline is caught inside when wearing, and the wearer's buttocks are exposed. The back waistline may shift to the crotch side, and it may be difficult to raise and lower the legs.

  However, the side flaps located on the rear side of the product longitudinal center of the leg opening extend outward in the width direction than the side flaps located on the front side of the product longitudinal center of the leg opening. A disposable diaper can be arrange | positioned so that the body which is asymmetrical may be covered, and a disposable diaper can be arrange | positioned corresponding to a wearer's body.

  Furthermore, the part by the side of the front waist area of the leg opening part 35 of a disposable diaper is distribute | arranged to the vicinity of a wearer's ridge part. Therefore, on the other hand, the part of the leg opening part 35 of the disposable diaper on the rear waistline region side is arranged on the gradually inflating part of the wearer's buttocks. By narrowing the width of the side flaps on the front waistline side and widening the width of the side flaps on the rear waistline side, the side flaps are arranged along the ridges while the side flaps are arranged along the ridges. Can be arranged.

  Further, by arranging the side flaps along the body line in this way and arranging the side flaps so as to cover the most swollen part of the buttocks, the movement of the wearer's legs is further added. However, it is possible to prevent the side flap on the buttock side from striking inward in the width direction beyond the most swollen portion of the buttock, and to prevent the buttock from being exposed.

  A plurality of convex portions 36 that are convex toward the outside in the product width direction are formed in the rear leg opening 35R. The convex portion 36 is a portion protruding outward in the product width direction from the region before and after the leg opening. The leg opening 35 is a portion that hits the wearer's leg and is a portion that easily enters the inside of the disposable diaper 10. Therefore, it is preferable that the leg opening 35 covers the body more widely, and it is particularly desirable that the rear leg opening 35R be disposed so as to cover the body widely. By providing the convex portion 36, the area of the rear leg opening portion 35R can be increased, and the shape of the convex portion can be widened to cover the collar portion widely.

  Furthermore, since stress tends to concentrate on the rear leg opening 35R, in particular, the rear part of the rear leg opening 35R, the convex 36 is formed so that the pressure on the skin can be more dispersed. Is preferred. Specifically, stress is likely to concentrate near the base end of the fastening tape 90, and it may overlap in the front and back when the disposable diaper 10 is worn, so that the pressure on the skin can be dispersed. It is preferable to make it into a shape.

  The front leg opening 35F is formed with a recess that is recessed toward the inside in the product width direction. The recessed portion 37 is a portion that is recessed inward in the product width direction from the front and back regions of the leg opening. Since the concave portion 37 is concave, it is easy to follow the wearer's ridge portion. For this reason, the side flap 70 and the leg expansion / contraction part 75 fit by a wearer, and the crotch region 25 from the front waistline area 20 of the disposable diaper 10 can be made to follow a body stably irrespective of a wearer's movement. For example, even when the movement of the wearer's leg narrows the width of the absorbent body 40, the concave portion 37 continues to fit into the ridge and maintains the wide state without the width of the absorbent body 40 narrowing. it can. The convex part 36 and the concave part 37 need to be along the wearer's body in addition to the pressure relief on the skin.

(2) Structure of leg stretchable part and heel stretchable part The leg stretchable part 75 is arranged along the product longitudinal direction L outside the absorbent body 40 in the product width direction and is configured to be stretchable in the product longitudinal direction L. .

  The leg expansion / contraction part 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in a region where the back sheet 60a disposed between the absorber 40 and the exterior sheet 60 is provided, the leg stretchable part 75 is disposed between the back sheet 60a and the side flap 70.

  The leg expansion / contraction part 75 is comprised by the predetermined number of elastic members (in the example of FIG. 1, two elastic members). The elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber. The collar expansion / contraction part 77 is configured by a predetermined number of elastic members (in the example of FIG. 1, one elastic member). The elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber.

  Moreover, the elastic member which comprises the collar part expansion-contraction part 77 of this Embodiment is the rubber thread arrange | positioned along the product longitudinal direction. Accordingly, the entire region of the side flap 70 where the heel expansion / contraction portion is provided can be evenly contracted so that the side flap 70 can follow the heel of the swelled wearer, so that the region can be covered without turning over the region. it can.

  The collar expansion / contraction part 77 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in the region where the back sheet 60a disposed between the absorber 40 and the exterior sheet 60 is provided, the collar expansion / contraction part 77 is disposed between the back sheet 60a and the side flap 70.

  The center O3 in the product longitudinal direction of the leg stretchable part 75 is located in front of the center O1 in the product longitudinal direction of the disposable diaper in the extended state of the disposable diaper. In the extended state of the disposable diaper, the product longitudinal center O4 of the leg opening 35 is located in front of the product longitudinal center O1 of the disposable diaper.

  In this way, by arranging the product longitudinal center O3 of the leg stretchable part 75 and the product longitudinal center O4 of the leg opening 35 in front of the product longitudinal center O1 of the disposable diaper, the leg stretchable part 75 is disposed. In the state where the disposable diaper is mounted with the product longitudinal center O3 and the product longitudinal center O4 of the leg opening 35 being applied to the product longitudinal center of the body, the length in the product longitudinal direction L of the rear waistline region 30 is set. The front waistline region 20 can be provided longer than the length in the product longitudinal direction L.

  As described above, the wearer's body is not symmetric in the front-rear direction, and the back side is longer than the abdomen side. For example, if the length in the product longitudinal direction L of the rear waistline region 30 and the length in the product longitudinal direction L of the front waistline region 20 are the same, the disposable diaper is not disposed along the body line that is asymmetrical in the front-rear direction.

  In particular, when the wearer's movement occurs (especially when the legs are raised, standing, or sitting in a sleeping position), the amount of skin expansion / contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side. Therefore, for example, the length in the product longitudinal direction L of the rear rear waistline region 30 in the natural state of the disposable diaper 10 is the same as the length in the product longitudinal direction L of the rear front waistline region 20 in the natural state of the disposable diaper 10. And it will be in the state stretched in the wearer's back side.

  However, according to the disposable diaper according to the present embodiment, the length in the product longitudinal direction L of the rear rear waistline region 30 of the disposable diaper 10 in the natural state is the product longitudinal length of the rear front waistline region 20 in the natural state of the disposable diaper 10. Since it can be made longer than the length in the direction L, the wearer's buttocks can be appropriately covered. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving and cover the buttocks appropriately.

  Further, the product longitudinal center O3 of the leg stretchable part 75 and the product longitudinal center O4 of the leg opening 35 are arranged in front of the product longitudinal center O1 of the disposable diaper, thereby moving the leg opening forward. It can be formed (near the ventral side). The wearer's legs extend toward the front of the body. In the state engaged by the fastening tape 90, the leg opening 35 is in the front position, so that the diaper is more suitable for the wearer's body. Therefore, it becomes easy for the wearer to move his / her foot during wearing, and the rear waistline region can be made difficult to stick.

  Further, the buttocks stretchable portion 77 is disposed across the crotch region 25 and the rear waistline region 30, and the product longitudinal center O5 of the buttocks stretchable portion 77 is more than the center O3 of the leg stretchable portion 75 in the product longitudinal direction. Located behind. The rear part of the leg elastic part 75 and the area outside the product width direction are contracted by the hip elastic part 77, and the vicinity of the leg opening part in the rear waistline region (the end part on the crotch side of the hip part) can be pulled up backward and in the width direction. . Drawing 4 is a figure showing typically the state where a disposable diaper was equipped.

  In the natural state of the disposable diaper, the expansion rate of the buttocks expansion / contraction part 77 is higher than the expansion rate of the leg expansion / contraction part 75. Since the extension rate of the buttocks stretchable part is higher than the extension rate of the leg stretchable parts, the diaper can be brought near the buttocks. Therefore, a disposable diaper can be gathered and gathered to a wearer's buttocks and the base of the back of a leg, and the pulling when a wearer raises and lowers a leg can be controlled.

  Moreover, the heel part expansion-contraction part 77 is arrange | positioned ranging over the crotch area 25 and the back waist area 30, and is arrange | positioned from the back waist area rather than the product longitudinal direction center of a disposable diaper. On the other hand, the leg expansion / contraction part 75 is arrange | positioned ranging from the front waist area 20 to the back waist area 30, and is arrange | positioned substantially at the product longitudinal direction center of a disposable diaper.

  In this way, the hip elastic part 77 and the leg elastic part 75 are arranged, and the extension rate of the hip elastic part is higher than the extension rate of the leg elastic part 75. The generated wrinkles extend outward from the center in the product width direction and extend from the crotch region toward the rear waistline region. Therefore, with the disposable diaper attached, the side flap on the back waistline side can be pulled up to the waist opening side while pulling the side flap on the back waistline side, and the side flap on the back waistline side is caught inside the width direction. Can be prevented.

  For example, when a disposable diaper is generally worn, the disposable diaper is pulled in the product longitudinal direction and fixed with a fastening tape or the like with the crotch region of the disposable diaper applied to the wearer's crotch. In such a state, the side flaps may be pulled up by the fastening force of the fastening tape, and the disposable diaper is pulled and worn in a straight line connecting the fastening tape and the product longitudinal center of the leg opening. There is a possibility that the side flaps cannot be arranged to cover the person's buttocks.

  However, by pulling the side flap on the rear waist area side outward in the width direction by the hip elastic part 77, pulling it up to the waist opening side, the side flap is pulled up regardless of the fastening force of the fastening tape. Deformation that does not occur can be suppressed. Furthermore, it is not necessary to pull up and fasten the fastening tape in order to pull up the side flaps, and it can be gently wound around the waist of the wearer, improving the wearing feeling.

  The natural state of the disposable diaper refers to a case where the disposable diaper 10 is taken out of the package and measured after being left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 60 minutes.

  Further, the front end portion 77F of the collar expansion / contraction portion is located behind the center of the leg opening 35 in the product longitudinal direction. Therefore, the rear part of the leg stretchable part and the region on the outer side in the product width direction are contracted by the buttock stretchable part 77, so that the vicinity of the leg opening part (the end part on the crotch side of the buttock) can be pulled rearward.

  For example, when a disposable diaper is generally worn, the disposable diaper is pulled in the front-rear direction and fixed with a fastening tape or the like with the crotch region of the disposable diaper applied to the wearer's crotch. When worn in this manner, the disposable diaper may be pulled between the fastening portion of the fastening tape and the crotch region, and the leg opening 35 may not be disposed around the wearer's leg.

  In particular, since the buttock side has a larger area of the buttock than the wearer's stomach side, the product width direction end of the rear waistline region may be caught inside when wearing, and a part of the buttock may be exposed. . However, the disposable diaper can be brought close to the rear waistline region 30 by the buttocks expansion / contraction part 77, and the problem that the wearer's buttocks are exposed can be suppressed.

  In the extended state of the disposable diaper 10, it is desirable that the distance D1 between the heel stretchable portion 77 and the leg stretchable portion 75 in the product width direction is 10 mm to 30 mm. For example, if the distance between the buttocks stretchable portion 77 and the leg stretchable portion 75 is 30 mm or more, the buttocks stretchable portion 77 and the leg stretchable portion 75 are stretched independently of each other, and the buttocks stretchable portion 77 and the leg stretchable portion 75 are It is difficult to interlock. However, when the distance between the heel stretchable portion and the leg stretchable portion in the product width direction in the extended state of the disposable diaper 10 is 10 mm to 30 mm, the heel stretchable portion 77 and the leg stretchable portion 75 are easily interlocked. For example, if only the buttocks stretchable part contracts independently, it is conceivable that when the diaper is worn, the contracted part is caught inside or falls down. However, it is possible to suppress the hip elastic part from falling inward by interlocking the hip elastic part and the leg elastic part.

  Note that the measurement of “length” in this specification is performed by the following measurement method.

  When the disposable diaper 10 is sealed in a package or the like, a sample that is taken out from the package and left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used.

  Next, the length of the disposable diaper 10 in this state, that is, the naturalness of the disposable diaper 10 is adjusted by using a spring measure manufactured by Shinwa Measurement Co., Ltd. The length of the leg extension 75 in the state is measured. The length of the stretched state is the length of the leg stretchable part 75 when the disposable diaper 10 is stretched from a natural state to a state where wrinkles due to the elastic member cannot be visually confirmed.

  Here, with respect to 10 samples, the above-described measurement was performed in each state, and the average value was defined as the length.

  The leg opening 35 has a convex shape that extends from the outer side in the product width direction toward the inner side in the product width direction, and the inner end portion 35I that is located on the innermost side in the product width direction in the leg opening 35 in the stretched state of the disposable diaper 10 and the leg elastic part The distance D2 to 75 is shorter than the distance in the product width direction between the leg stretchable part and the heel stretchable part, and is 15 mm or less.

  When the distance between the inner end 35I of the leg opening 35 and the leg stretchable part 75 in the extended state of the disposable diaper 10 is longer than 15 mm, the contraction force by the leg stretchable part 75 acts on the inner end of the leg opening 35. Therefore, there is a possibility that the leg opening 35 cannot be properly contracted by the leg expansion / contraction part 75. Further, the inner end 35I of the leg opening 35 is a portion that is sandwiched between the legs of the wearer in a worn state and is in close contact with the wearer. When the distance between the inner end 35I of the leg opening 35 and the leg stretchable part is 15 mm or less, at least a portion of the leg opening that is in close contact with the wearer can be contracted and arranged along the legs of the wearer.

  The side flap 70 is formed with a frill-like contracted portion contracted by the leg stretchable portion 75 and the heel stretchable portion 77. The leg stretchable part 75 and the buttocks stretchable part 77 can bring the frill-like contracted part into close contact with the body. In addition, the distance between the inner end 35I located at the innermost side in the product width direction and the leg stretchable part in the leg opening is shorter than the distance between the leg stretchable part and the heel stretchable part. It is easy to maintain the shape in which the entire region in which the buttock expansion / contraction part of the side flap is arranged is widened by suppressing the entanglement of the end part and disposing the heel expansion / contraction part from the crotch part to the rear waistline region.

  Further, since the frill formed by the leg stretchable part 75 and the collar stretchable part 77 stretches in the product longitudinal direction, the frills (wrinkles) extend along the product width direction. This frill (wrinkle) becomes a support and can prevent the product width direction end part of the rear waistline region from getting inward in the width direction.

  In addition, the collar expansion / contraction portion 77 may be stretched over the entire region, or the regions at both ends thereof may be in a non-stretchable state. For example, wrinkles are suppressed in the vicinity of the rear leg opening 35R by making the regions (10 mm or less, 2 mm or more region, more preferably 5 mm or less, 2 mm or more region) at both ends of the collar expansion / contraction portion 77 non-stretchable. You can do it. Therefore, the vicinity of the rear leg opening 35R can more closely follow the body. In addition, by not providing an adhesive such as an HMA adhesive at the end of the collar expansion / contraction part 77, the edge of the rear leg opening 35R where the end of the collar expansion / contraction part 77 is positioned can be softened.

  In the natural state of the disposable diaper 10, the inner end 35I of the leg opening is located on the center line L2 passing through the center of the leg stretchable part and the heel stretchable part in the product width direction and along the product longitudinal direction. According to such a structure, the inner side edge part of a leg opening part can be pulled up by a leg elastic part and a collar part elastic part, and the entrainment of the inner side edge part of a leg opening part can be prevented. Therefore, the inner side edge part of a leg opening part can be arrange | positioned along a body.

  The elongation ratio of the leg stretchable part 75 is preferably 1.7 to 2.4 times. In the present embodiment, the extension rate of the leg stretchable part 75 in the natural state of the disposable diaper is set to 1.9 to 2.2 times. The extension rate of the leg stretchable part 75 means the degree of extension of the leg stretchable part, and is defined as follows.

Elongation rate = (length of leg stretchable part in stretched state) ÷ (length of leg stretchable part in natural state)
Moreover, it is preferable that the expansion | extension rate of the collar expansion-contraction part 77 is 1.6 to 2.4 times. In addition, the expansion rate of the buttocks expansion / contraction part 77 means the degree of expansion of the buttocks expansion / contraction part, and is defined as follows.

Elongation rate = (length of the heel expansion / contraction part in the extended state) ÷ (length of the heel expansion / contraction part in the natural state)
In this specification, it is assumed that the elongation rate of the leg stretchable part 75 and the stretch rate of the heel stretchable part 77 are measured as follows, for example.

  1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package. Next, mark both ends of the leg stretchable part and the heel stretchable part.

  Each sample was left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 60 minutes, and the length of the stretchable part in the natural state (between the marks) was measured by a spring measure manufactured by Shinwa Measurement Co., Ltd. The length is measured so as to be along the elastic member by using a tape portion: vinyl chloride containing glass fiber). This length is defined as “the natural length of the leg stretchable portion” or “the natural length of the heel stretchable portion”. In addition, the length of the stretched state is such that the disposable diaper 10 is stretched from the natural state to a state where wrinkles due to the elastic member cannot be visually confirmed, and the stretched portion stretched length (between marks) is measured by Shinwa Measurement Co., Ltd. The length is measured by using a spring measure (tape part: coated with vinyl chloride containing glass fiber) so as to be along the elastic member. This length is defined as “the length of the leg stretchable portion in the extended state” or “the length of the heel stretchable portion in the extended state”.

  Using these measurement results, the elongation percentage is measured by calculating with the above formula.

(3) Shape of Crotch Stretchable Part Next, the shape of the crotch stretchable part 200 will be described. The crotch stretchable part 200 is configured to maintain a flat shape in a part of the crotch region when the disposable diaper is worn rather than the other part of the absorber 40. The crotch stretchable portion 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W.

  The crotch stretchable part 200 is provided separately from the leg stretchable part 75 and overlaps the absorbent core 40a (in this embodiment, between the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a). Position), 60% or more of the length in the product width direction of the absorbent core 40a at the overlapping position is contracted. In this way, by shrinking the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200, the absorbent core 40a shrinks, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not shrink. Become.

  On the other hand, the absorbent core 40a located in the front waistline region and the rear waistline region located on the outer side in the product longitudinal direction from the crotch stretchable portion 200 is not contracted by the crotch stretchable portion 200. Therefore, the crotch stretchable part 200 that is maintained in a flat shape at the crotch part of the disposable diaper in a state of being held around the waist / waist of the wearer by the fastening tape does not excessively adhere to the body, resulting in the crotch. The stretchable part 200 is appropriately placed along the body.

  In addition, when the crotch stretchable portion 200 is stretchable along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are likely to stand up due to the shrinkage of the crotch stretchable portion 200. A flat crotch region can be formed along the body at the part.

  As a result, since the front waistline region 20 and the back waistline region 30 rise from the crotch stretchable part 200, the fit of the disposable diaper 10 to the wearer is improved.

  That is, the disposable diaper 10 can be stably mounted so that the crotch region 25 of the disposable diaper 10 is disposed in the crotch part of the wearer due to the contraction of the crotch stretchable part 200.

  Further, the crotch stretchable part 200 may be configured to extend to the front waistline region 20 side and the back waistline region 30 side across the center O1 of the disposable diaper 10 in the product longitudinal direction L.

  Further, the center O2 of the crotch stretchable part 200 in the product longitudinal direction L is arranged on the front waistline region 20 side with respect to the center O1 of the disposable diaper 10 in the product longitudinal direction L.

  On the other hand, when there is movement of the wearer (especially when the legs are raised, standing, or sitting in the sleeping position), the amount of skin expansion and contraction (the amount of change in length) on the surface of the wearer's body ) Is larger on the dorsal side (buttock) than on the ventral side.

  By placing the center O2 of the crotch stretchable part 200 in the product longitudinal direction L closer to the front waistline region 20 than the center O1 of the disposable diaper 10 in the product longitudinal direction L, the rear waistline region 30 of the disposable diaper 10 in its natural state The length in the product longitudinal direction L of the product can be made longer than the length in the product longitudinal direction L of the front waistline region 20. Therefore, even if there is a movement of the wearer, the front waistline region 20 and the back waistline region 30 of the disposable diaper 10 are in a direction along the product longitudinal direction L due to the movement of the wearer's skin. It becomes possible to suppress the situation of moving.

  The crotch stretchable part 200 is preferably composed of a stretchable sheet.

  By configuring the crotch stretchable portion 200 with the stretchable sheet, the absorbent core 40a in the region where the stretchable sheet is disposed is uniformly shrunk, and it becomes easier to maintain a flat shape.

  Further, instead of the elastic sheet, the crotch expansion / contraction part 200 may be configured by arranging a plurality of thread-like / strip-like elastic members made of polyurethane elastic fiber or natural rubber. In this case, in order to uniformly shrink the absorbent core 40a by the crotch expansion / contraction part 200, the interval between the elastic members is 7 mm or less, more preferably 5 mm or less. Moreover, in order to shrink the absorptive core 40a uniformly, it is desirable that the difference in the interval between adjacent elastic members is 2 mm or less.

  Further, specifically, the elongation rate of the crotch stretchable part 200 is preferably 1.2 times or more and 1.8 times or less. In this embodiment, the expansion rate of the crotch expansion / contraction part 200 is set to 1.4 times. The elongation rate means the degree of elongation in the expansion / contraction direction (product longitudinal direction L) of the crotch expansion / contraction part 200, and is defined as follows.

  The elongation rate means the degree of expansion of the crotch expansion / contraction part 200 in the expansion / contraction direction (product longitudinal direction L in the present embodiment), and is defined as follows.

Elongation rate = (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the natural state)
In addition, the measurement of an expansion rate is the same as that of the above-mentioned leg expansion-contraction part, and abbreviate | omits description.

  By setting the elongation rate of the crotch stretchable part 200 to 1.2 times or more and 1.8 times or less, it is possible to suitably follow the stretch of the wearer's skin.

  For example, when the wearer takes a forward bending posture such that the front side of the body contracts, there is a portion that extends about 30% in the skin on the buttocks side of the wearer relative to the stretched body.

  That is, if the expansion rate of the crotch stretchable portion 200 is 1.2 times or less, the crotch stretchable portion 200 in the natural state is not sufficiently contracted, and the disposable diaper 10 is compared with the case where the crotch stretchable portion 200 is not provided. The shrinkage of the absorber region in the crotch of the wearer is small, and it becomes insufficient to take a flat shape along the body in the crotch of the wearer.

  On the other hand, if the expansion rate of the crotch expansion / contraction part 200 is larger than 1.8 times, the contraction dimension of the crotch expansion / contraction part 200 in the contraction direction becomes too large, so that the region where the crotch expansion / contraction part 200 exists is more than along the body. The disposable diaper 10 is likely to be in a close contact state, and easily displaced downward from the wearer.

  Moreover, the shrinkage | contraction amount in the product longitudinal direction L of the crotch expansion-contraction part 200 may be comprised so that it may become 2-8% of the length in the product longitudinal direction L of the disposable diaper 10. FIG.

  The amount of shrinkage is the length “b (mm)” in a stretched state so that the wrinkles are sufficiently small and the surface of the sample is almost smooth, and in the natural state in the direction along the stretching direction of the sample. It is the difference from the length “a (mm)” and can be calculated by (b−a).

  The present inventor assumes that the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L, and the process of mounting the disposable diaper 10 on the wearer. In the above, it was confirmed that the crotch stretchable part 200 is preferably easily along the wearer's body.

  Here, when the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is larger than 8%, the crotch stretchable part 200 is contracted too much, and the disposable diaper 10 is not sufficiently short in the product longitudinal direction L. It becomes difficult to attach the diaper 10 to the wearer's body, or the disposable diaper 10 and the wearer's body are in close contact with each other in the crotch region 25 and are likely to be displaced.

  On the other hand, if the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is 2% or less, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 closer to the wearer's body becomes difficult to manifest.

  In addition, the center of the crotch stretchable part 200 in the product longitudinal direction L is arranged closer to the front waistline region 20 than the center of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200 is arrange | positioned so that the center of the disposable diaper 10 in the product longitudinal direction L may be straddled.

  In such a case, considering the rigidity of the absorbent core 40a and the rigidity of other members constituting the disposable diaper 10, the thickness of the elastic member to be used and the pitch to be arranged can be appropriately selected. It is preferable that the entire side edge portion in the product width direction W of the absorbent core 40a is in a contracted state in the stretched state.

  Further, a notch 115 (notch 125) is formed in the crotch region 25 of the absorber 40. The notch 115 and the notch 125 are regions where the absorbent core 40a constituting the absorber 40 is not present. In the present embodiment, the notch 115 and the notch 125 correspond to a low-rigidity part in which the basis weight of the absorbent core 40a is lower than other parts of the absorbent core 40a. Instead of forming the notch 115 and the notch 125, the area of the notch 115 and the notch 125 is set so that the basis weight of the absorbent core 40a is lower than the other parts of the absorbent core 40a. Also good.

  The notch 115 and the notch 125 exist along the edge of the crotch stretchable part 200 in the product longitudinal direction L. Even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 is completely separated from the absorbent core 40a located in the crotch region 25. It is preferable that it is continuous especially in the product width direction.

  The notch 115 and the notch 125 have longer lengths in the product longitudinal direction L (natural state of the disposable diaper 10) as they go outward in the product width direction W. With such a shape, the outer side of the absorbent core 40a in the product width direction W is more easily contracted, so that a flat “bottom” is more easily formed. Furthermore, the absorbent core 40a located closer to the front waistline region 20 than the notch 115 and the absorbent core 40a located closer to the rear waistline region 30 than the notch 125 rise from the "bottom part", and the wearer's Since it becomes easy to curve along the roundness of the body (abdomen and buttocks), the shape of the disposable diaper itself can be closer to the shape of the wearer's body.

  Further, the edge portion of the notch 115 (notch 125) near the front waistline region 20 (rear waistline region 30) has an arc shape. The edge of the notch 115 (notch 125) is shaped such that the center of the arc is located in the rear waistline region 30 (front waistline region 20) with respect to the edge. With such a shape, deformation along the roundness of the wearer's body is easier and more likely to occur.

  The width of the crotch stretch part 200 in the product width direction W is ½ or more of the width of the absorbent core 40a in the product width direction W in the region where the crotch stretch part of the absorbent core 40a exists.

  Accordingly, the crotch expansion / contraction part 200 contracts a certain width or more of the portion where the absorbent core 40a is disposed, so that the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body.

The gap between the disposable diaper 10 and the wearer can be reduced by realizing such a raised crotch region of the absorbent core 40a. When the width of the crotch stretchable part 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W, more preferably 80% or more, disposable diapers The gap between 10 and the wearer can be further reduced.

  Furthermore, if the width of the crotch stretchable part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a. On the other hand, when the width of the crotch stretchable part 200 is too wide compared to the width of the absorbent core 40a, the portion where the absorbent core 40a is not disposed is contracted more than the portion where the absorbent core 40a is disposed. The disposable diaper 10 is attached. As a result, the members constituting the portion where the absorbent core 40a is not disposed overlap each other, the crotch stretchable portion 200 becomes hard, and the comfort of the disposable diaper 10 is impaired.

  For example, in the region where the crotch expansion / contraction part of the absorbent core 40a is present, the width of the crotch expansion / contraction part 200 is preferably 60 to 110 mm when the dimension of the narrowest part (in the extended state) is 120 mm. . More preferably, the width of the crotch expansion / contraction part 200 is 90 to 110 mm.

  The part where the width of the absorbent core 40a is the narrowest in the product width direction W is preferably provided on the front side of the product longitudinal direction by 10 to 60 mm. Preferably, the part where the width of the absorbent core 40a is the narrowest in the product width direction W is provided on the front side of the product longitudinal direction by 20 to 40 mm. It is preferable that the crotch stretchable part 200 is formed so as to straddle a portion where the width of the absorbent core 40a is the narrowest in the product width direction W.

  The position where the left and right thighs of the wearer are closest to each other is in front of the center of the wearer's body in the front-rear direction. Therefore, the portion where the width of the absorbent core 40a is the narrowest in the product width direction W can be positively arranged at the position where the left and right thighs of the wearer are closest to each other by the contraction force of the crotch stretchable portion 200. . In other words, even if a wear assistant such as a mother does not align the absorbent core 40a, the absorbent core 40a is naturally aligned.

(4) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated. In addition, about the method which is not demonstrated in this embodiment, the existing method can be used. Moreover, the manufacturing method demonstrated below is an example and can also be manufactured with another manufacturing method. The manufacturing method of an absorbent article includes at least a component part forming step, a component part placing step, a leg periphery forming step, and a cutting step.

  In the component part forming step, the component parts constituting the absorbent article are formed. Specifically, for example, the absorbent body 40 is molded by laminating absorbent materials.

  In the component mounting step, on the web constituting the back sheet, the elastic sheet constituting the leg stretchable part 75, the other web such as the web constituting the top sheet, the leakproof sheet, the absorber, the leg stretchable part 75, the component parts which comprise the disposable diaper 10, such as the buttocks elastic part 77, are mounted.

  At this time, the leg stretchable part 75 and the heel stretchable part 77 are arranged to be stretched in the longitudinal direction at the same stretch rate.

  In the leg periphery forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut. As a result, the front end portion 77F of the buttocks stretchable portion 77 is cut, and the leg opening 35 is formed around the wearer's leg.

  In the cutting step, the continuous body on which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut into the size of one product along the product width direction W. Thereby, the disposable diaper 10 is manufactured.

  When the disposable diaper is cut, the leg stretchable part 75 and the heel stretchable part 77 are in a natural state. As shown in FIG. 2, the leg stretchable part 75 is disposed in a region where the exterior sheet 60, the backsheet 60 a, and the side flap 70 are laminated, and the collar stretchable part 77 is composed of the exterior sheet 60 and the side flap 70. Arranged in the stacked region. Therefore, in the natural state, the heel expansion / contraction part 77 contracts more than the leg expansion / contraction part, and the expansion rate of the heel expansion / contraction part becomes higher than the expansion rate of the leg expansion / contraction part.

(5) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  The leg stretchable part 75 may coincide with the joint part of the leg side gathers in the product width direction, or may be arranged on the inner side in the product width direction than the joint part of the leg side gathers. The elastic members constituting the leg stretchable part 75 and the collar stretchable part 77 may be one, or may be two or more.

  Moreover, although embodiment mentioned above demonstrated as an example the open-type disposable diaper, this invention can also be applied to a pants-type disposable diaper. For pants-shaped diapers having a waistline opening and a pair of leg openings by joining the right and left side edges of the outer layer sheet forming the front waistline and the back waistline, the outer layer sheets of the front waistline and the back waistline Has an elastic element that can be contracted and extended in the product width direction W, and the disposable diaper is held around the wearer's waist by contracting them. That is, the range where the left and right side edges extending in the product longitudinal direction L are joined is the waistline holding portion.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

10: disposable diapers
20: Front waist area
25: Inseam area
30: Rear waist area
35: Leg opening
35I: Inside edge
35F: Front leg opening
35R: Rear leg opening
40: Absorber
40a: Absorbent core
40b: Core wrap
50: Top sheet
60: exterior sheet
60a: Back sheet
70: Side flap
75: Leg stretchable part
77: Hip elastic part
77F: Front end
80: Legside gather
81: Elastic member
85: waist elastic part
90: Fastening tape
91: Base sheet
92: Hook sheet
95: Target section
115: Notch
125: Notch
200: Crotch expansion / contraction part
L: Product longitudinal direction
W: Product width direction

Claims (8)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
An absorbent body straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region;
A side flap that straddles the front waistline region, the crotch region, and the rear waistline region, and is disposed on the outer side in the product width direction than the absorber;
It said extending from said rear waist region of the side flaps to the product width direction outside, and a pair of fastening tapes for fastening the front waist region wherein,
Leg wherein the side flaps, wherein said product widthwise leg-opening recessed toward the center of the absorber, is disposed in the product width direction inner side than the leg opening, and expands and contracts in the product longitudinal direction An elastic part is formed,
The leg opening includes a rear leg opening positioned rearward of the product longitudinal center of the leg opening, and a front leg opening positioned forward of the product longitudinal center of the leg opening. Have
The area between the rear leg opening and the straight line passing through the center in the product width direction and parallel to the product longitudinal direction is the longitudinal direction of the product passing through the front leg opening and the center in the product width direction. wider than the area between the straight line extending,
On the outer side in the product width direction than the leg stretchable part, a heel part stretchable part that is disposed across the crotch region and the rear waistline region and stretches in the product longitudinal direction is disposed,
The disposable diaper has a higher stretch rate of the heel stretchable portion than the stretch rate of the leg stretchable portion. The disposable diaper according to claim 1, wherein the product longitudinal direction center of the heel stretchable part is located behind the center of the leg stretchable part in the product longitudinal direction.   The center of the product longitudinal direction of the leg stretchable part and the center of the product longitudinal direction of the leg opening are located forward of the center of the disposable diaper in the product longitudinal direction. The disposable diaper described.   The disposable diaper according to any one of claims 1 to 3, wherein a distance between the collar stretchable portion and the leg stretchable portion in the product width direction is 10 mm to 30 mm. The distance between the inner end and the leg stretch unit located closest to the product width direction inner side at the leg openings is shorter than the distance between the buttocks stretchable portion and the leg stretch unit, and it is 15mm or less, wherein The disposable diaper in any one of Claims 1-4. The inner end portion of the leg opening, through the center of the product width direction of the leg stretch portion and the buttocks stretchable portion, and positioned in the product longitudinal direction along the on the center line, according to claim 5 Disposable diapers.   The disposable diaper according to any one of claims 1 to 6, wherein a convex portion that is convex toward the outer side in the product width direction is formed in the rear leg opening.   The disposable diaper in any one of Claims 1-7 in which the recessed part used as the shape dented toward the said product width direction inner side is formed in the said front side leg opening part.

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