JP2013230228A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper capable of following motions of a wearer's legs while suppressing a stimulus to his/her skin.SOLUTION: A disposable diaper 10 includes a leg expansion/contraction part 75 which is disposed along a leg periphery opening provided on the width-direction outside of a product with respect to an absorber and which can be expanded/contracted along the longitudinal direction of the product. An auxiliary expansion/contraction part 76 which can be expanded/contracted along the longitudinal direction of the product is provided between a product-width-direction absorber and the leg expansion/contraction part. The auxiliary expansion/contraction part is disposed in the state of being biased to a rear-waist-periphery-area side with respect to the center in the longitudinal direction of the product. The product-longitudinal-direction extension percentage of the auxiliary expansion/contraction part is higher than that of the leg expansion/contraction part.

Description

  The present invention relates to a disposable diaper.

  Conventionally, it has a front waistline region, a rear waistline region, and a crotch region, and has a pair of leg-hole openings, and has an absorbent body that straddles the crotch region and extends to the front waistline region and the back waistline region. There is known a disposable diaper in which a leg stretchable part that stretches and contracts is arranged along the leg opening. The leg diaper opening of the disposable diaper configured in this way is arranged along the wearer's leg circumference (see, for example, Patent Document 1).

JP 2001-37807 A

  In general, comparing the line of the wearer's body in the abdomen on the front side of the crotch and the buttocks on the back side of the crotch, the buttock is swollen, and when the wearer moves the leg, The expansion and contraction of the skin due to the movement of the buttocks side is larger than the expansion and contraction of the skin due to the movement of the ventral side. Therefore, even if it is a case where a disposable diaper is mounted | worn along a wearer's leg periphery, a back waist area may not be arrange | positioned in a sufficient area | region with respect to a buttocks. Wearing in such a state tends to make the rear waist area stretched, the disposable diaper can not follow the movement of the leg, the disposable diaper is displaced, the disposable diaper obstructs the movement of the leg, the leg and the disposable A gap may be provided between the diaper and leakage may occur.

  In order to solve such problems, it is conceivable to improve the adhesion of the disposable diaper to the leg so that the disposable diaper follows the movement of the leg. However, if the adhesiveness to the wearer's leg becomes too high, the skin becomes more irritating and skin troubles such as redness and rough skin may occur.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the disposable diaper which can follow a wearer's leg and can follow a motion, suppressing the irritation | stimulation to skin.

  A disposable diaper according to the present disclosure (disposable diaper 10) is located between a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and the front waistline region and the rear waistline region. A product longitudinal direction (product longitudinal direction L) that has a crotch region (inseam region 25) and goes from the front waistline region to the rear waistline region, and a product width direction (product width direction W) orthogonal to the product longitudinal direction; An absorber (absorbent body 40) extending across the crotch region and extending from the crotch region toward at least one of the front waistline region and the rear waistline region, and the product width than the absorber A leg diaper (leg elastic part 75) disposed along a leg opening provided on the outer side in the direction and capable of extending and contracting along the product longitudinal direction. And the leg elastic part It extends toward the outer side in the product width direction from the region toward the outer side in the product longitudinal direction, and can shrink along the product longitudinal direction between the absorber and the leg stretchable part in the product width direction An auxiliary stretchable portion (auxiliary stretchable portion 76) is provided, and the auxiliary stretchable portion is arranged to be biased toward the rear waistline side from the center in the product longitudinal direction, and the product of the auxiliary stretchable portion The gist is that the elongation rate in the longitudinal direction is higher than the elongation rate in the product longitudinal direction 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 follow the movement of the leg of the wearer while suppressing irritation to the skin.

It is an expanded top view of the disposable diaper concerning this embodiment. 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 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 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) Whole schematic structure of disposable diaper FIG.1 and FIG.2 is an expansion | deployment top view of the disposable diaper 10 which concerns on this embodiment. FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along the line F1-F1 shown in FIG.

  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. Further, the disposable diaper 10 is formed with a pair of leg-hole openings 35. The leg opening 35 is provided at a side end in the product width direction of the disposable diaper, and is a portion that is disposed along the leg of the wearer while the disposable diaper is worn by the wearer.

  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 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.

  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 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets. 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.

  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 width direction from the region where the engaging member of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 20 is a range extending in the width direction from the region where the target portion 95 is provided.

  The disposable diaper 10 includes a crotch stretchable part 200a formed in the crotch region 25 and stretchable in the product longitudinal direction L. Specifically, the crotch expansion / contraction portion 200a is disposed in the crotch portion 200 formed in the crotch region 25. The configurations of the crotch unit 200 and the crotch expansion / contraction unit 200a will be described in detail later.

The surface side (top sheet 50 side) of the absorber 40 is provided around a leg opening 35 and is provided with a pair of leg stretchable parts 75 that can be stretched in the product longitudinal direction L.
The leg stretchable part 75 is longer than the crotch stretchable part 200a in the product longitudinal direction L, and is provided outside the crotch stretchable part 200a in the product width direction W. Further, an auxiliary expansion / contraction portion 76 that is contractible along the product longitudinal direction is disposed inside the leg expansion / contraction portion 75 in the width direction and outside the absorbent body 40 in the width direction. The configuration of the leg stretchable part 75 and the auxiliary stretchable part 76 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 in the product width direction of the side flaps 70, and are stand-up stretchable gathers that are arranged on the inner side in the product width direction than the leg stretchable parts. The leg side gathers 80 are arranged on the inner side in the product width direction with respect to the leg stretchable part 75 and function as a legside stretchable part.

  The side flap 70 is folded back to the top sheet side at the inner end in the product width direction, and two layers are laminated. An elastic member 71 (see FIG. 3) is provided between the two layers of side flaps 70 so as to extend in the longitudinal direction. The side flaps 70 and the elastic members 71 form leg side gathers 80.

  The developed plan view of the disposable diaper shown in FIG. 1 is a state in which the elastic member 71 of the leg side gather 80 is contracted, and the developed plan view of the disposable diaper in FIG. Indicates the state.

  The leg side gather 80 includes a joint portion 81 joined to the top sheet 50 or the back sheet 60a, and a free end portion 82 on which an elastic member is disposed. Of the free end portion 82, the central portion in the longitudinal direction including the crotch region 25 is contracted in the product longitudinal direction by the elastic member 71 to form a contracted portion 84. When worn, the leg side gather 80 rises with the joint portion 81 as the base end portion, and the contraction portion 84 of the free end portion 82 contacts the wearer's skin with the apex portion. That is, the joint portion becomes the base end portion of the rising side of the leg side stretchable portion.

  The contraction portion 84 is a portion substantially contracted in the product longitudinal direction by the elastic member 71, and is a concept excluding a portion where the elastic member 71 is disposed in a state where the contraction force is not exerted. Further, in FIG. 2, in the leg side gather, a joining portion 81 where the side flap 70 and the top sheet 50 (or the back sheet 60a or the like) are joined is shown by hatching.

  A plurality of joint portions 81 are provided, the first joint portion 81A is disposed outside the contraction portion 84 in the product longitudinal direction, and the second joint portion 81B is disposed outside the contraction portion 84 in the product width direction. ing. Therefore, the leg side gathers 80 are configured such that the center portion in the product longitudinal direction including the crotch region 25 stands on the wearer side.

  Of the joint portions 81 of the leg side gathers 80, the second joint portion 81B disposed on the outer side in the product width direction with respect to the contraction portion 84 is between the crotch stretch portion 200a and the leg stretch portion 75 in the product width direction W. Placed in. The second joining portion 81B is joined to the back sheet 60a (and partly the exterior sheet 60) over the entire length in the product longitudinal direction. The back sheet 60a is disposed between the absorber 40 and the exterior sheet 60, and functions as a leak-proof sheet.

  Of the joined portions 81 of the leg side gathers 80, the first joined portions 81A arranged on the outer side in the product longitudinal direction from the contracted portion 84 are joined to the top sheet 50.

The joining portion 81 of the leg side gather 80 can employ various configurations. The joining portion may be, for example, a portion that extends from the crotch part to the front waistline region and the back waistline region in the product longitudinal direction and is joined to the top sheet, or liquid-impermeable on the outer side in the width direction than the absorbent core 40a. It may be a part joined to a conductive back sheet or exterior sheet, and is configured to be a standing base end part.
Further, the leg side gathers only need to be an upright gather disposed on the inner side in the product width direction with respect to the leg stretchable part, and are not limited to the above configuration, and it is possible to adopt a conventionally known leg side gather configuration. It is.

  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 stretchable portion 85 is disposed between the pair of fastening tapes in a plan view and contracts between the fastening tapes in the width direction. The waist elastic part 85 is disposed on the surface of the top sheet on the skin contact side, and contracts between the fastening tapes in the 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.

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 stretchable portion 85 is disposed between the exterior sheet 60 and the backsheet 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 extension / contraction part is not particularly limited, but is preferably disposed closer to the non-skin contact surface than the absorber 40. 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.

  The waist stretchable portion according to the present embodiment is configured to stretch in the product width direction, but the waist stretchable portion may be configured to stretch in the product width direction and the product longitudinal direction. Good.

(2) Leg stretchable part and auxiliary stretchable part Next, the leg stretchable part 75 and the auxiliary stretchable part 76 will be described in detail. The leg expansion / contraction part 75 is arranged along the leg opening 35 provided on the outer side in the product width direction with respect to the absorber 40, and is configured to be extendable / contractible in the product longitudinal direction L. The leg opening 35 and the leg expansion / contraction part 75 have a width direction inner end region 75I whose position in the width direction is located at the innermost side in the crotch region, and the product width from the crotch region 25 toward the product longitudinal direction outer side. It extends toward the outside in the direction. The width direction inner end region 75I of the leg stretchable part 75 may be arranged continuously in the product longitudinal direction or may not be continued in the product longitudinal direction.

  The leg elastic | stretch part 75 of this Embodiment is comprised by the elastic sheet. For example, the stretchable sheet may be a stretchable film formed by melting a thermoplastic elastomer resin such as urethane or styrene, a stretchable nonwoven fabric made of stretchable fibers, a stretchable film or a stretchable nonwoven fabric. A composite sheet or the like obtained by laminating a non-stretchable sheet that has been cut or weakened can be used.

  Further, instead of the stretchable sheet, the leg stretchable part 75 may be configured by arranging one or a plurality of thread-like / strip-like elastic members made of polyurethane elastic fiber or natural rubber.

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

  The stretchable sheet constituting the leg stretchable part 75 has a width of at least 5 mm (width in the product width direction W in the natural state of the disposable diaper 10) and at least 45 mm, more preferably at least 12.5 mm and not more than 35 mm, at least in the crotch region 25 It is preferable. If it is less than 5 mm, the effect of lowering the load on the skin due to the elastic element does not appear because the force of tightening partially does not concentrate by following the wearer's leg around the surface, and if it exceeds 45 mm As compared with the length of the entire disposable diaper in the product width direction, the region along the leg circumference becomes too wide, and the stretchable sheet is easily wound around the wearer's body or turned up.

The elongation ratio of the leg stretchable part 75 is preferably 1.5 to 2.2 times. In this embodiment, the expansion ratio of the leg stretchable part 75 is set to 1.8 to 2.0 times. The elongation rate means the degree of elongation of the leg stretchable part or auxiliary stretchable part, and is defined as follows.
Elongation rate = (length of leg stretch part in stretched state) ÷ (length of leg stretch part in natural state), or
Elongation rate = (Length of the auxiliary stretchable part in the stretched state) ÷ (Length of the auxiliary stretchable part in the natural state)
In addition, in this specification, this elongation rate shall be 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. Subsequently, the arrangement | positioning area | region of a leg expansion-contraction part is cut out. At this time, it cuts out including the non-stretch sheet | seat joined to a leg expansion-contraction part. Furthermore, the arrangement | positioning area | region of an auxiliary | assistant expansion-contraction part is cut out. At this time, it cuts out along the auxiliary elastic part at a position of 0.5 to 1.0 mm outside the auxiliary elastic part in the product width direction. The elongation rate of the leg stretchable part after cutting is measured, and the stretch rate of the leg stretchable part is measured. Moreover, the elongation rate of the sample of the auxiliary | assistant expansion-contraction part after cut out is measured, and the expansion | extension rate of an auxiliary expansion / contraction part is measured.

  Each sample is left for 60 minutes in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH, and the lengths of the leg stretch part and the auxiliary stretch part are measured along the stretch direction. This length is defined as “the length of the leg elastic part in the natural state” and “the length of the auxiliary elastic part in the natural state”.

Secondly, the length in the stretch direction of the desired region in such a state (that is, the natural state), and the desired state when stretched from the natural state to a state where wrinkles due to the elastic member cannot be visually confirmed on the non-stretchable sheet Measure the length of the region in the stretch direction. This length is defined as “the length of the leg stretchable part in the extended state” and “the length of the auxiliary stretchable part in the stretched state”.
Using these measurement results, the elongation percentage is measured by calculating with the above formula.

  Further, the distance between the inner ends in the product width direction W of the pair of left and right leg expansion / contraction portions 75 becomes wider from the crotch region 25 toward the front waistline region 20, and as the distance from the crotch region 25 toward the rear waistline region 30 increases. And become wider. When wearing a diaper on the wearer's body, it is possible to make the leg stretchable part follow the body line more by placing the leg stretchable part in a shape that narrows at the crotch and spreads toward the front and rear waistline, A leg expansion-contraction part will be suitably extendedly arranged around a wearer's leg.

  Further, the distance (D1 in the figure) at the end of the front waistline region 20 of the pair of left and right leg stretchable parts 75 is the distance (D2 in the figure) at the end of the rear waistline area 30 of the pair of left and right leg stretchable parts 75. Narrower than. The interval is defined as the inner end in the product width direction W of the pair of left and right leg stretchable parts 75 after the disposable diaper 10 is expanded and held in the product longitudinal direction L and the product width direction W in a state where there is no wrinkle from the natural state. The distance between them is measured.

  The elongation of the skin surface of the wearer's body is particularly large in the buttocks, and is prominent at positions closer to the outside in the width direction. Further, the leg stretchable part 75 is in close contact with the wearer's body. Therefore, by setting D2> D1, even when the movement of the wearer is applied to the disposable diaper 10, the leg stretchable part 75 on the buttock side can be stretched while being in close contact, and even if the amount of change in stretch is large, the leg The elastic part 75 does not stretch. Therefore, the displacement of the disposable diaper 10 by the leg expansion / contraction part 75 can be suppressed.

  The auxiliary stretchable part 76 is disposed between the absorber 40 and the leg stretchable part 75 in the product width direction, and is configured to be shrinkable in the product longitudinal direction. The auxiliary stretchable part 76 is not arranged in a curved shape along the leg opening 35 but is arranged in a straight line along the product longitudinal direction.

  The auxiliary stretchable part 76 is constituted by a thread-like elastic member. For example, an elastic member having a thickness of 340 to 940 dtex can be used. Further, the extension rate of the auxiliary extension / contraction part 76 is configured to be higher than the extension rate of the leg extension / contraction part 75. Specifically, the extension rate of the auxiliary stretchable part 76 is preferably 1.8 to 2.5 times. In the present embodiment, the extension rate of the auxiliary expansion / contraction part 76 is set to 2.1 times.

  The auxiliary stretchable part 76 is disposed between the back seat 60a and the side flaps 70. Depending on the length of the back sheet 60a in the product width direction, it may be disposed between the side flap 70 and the exterior sheet 60.

  The auxiliary expansion / contraction part 76 is biased from the center in the product longitudinal direction toward the rear waistline region. The region that expands and contracts by the auxiliary expansion / contraction part 76 is wider in the rear waistline region than in the front waistline region.

  The leg elastic part 75 and the auxiliary elastic part 76 are parts that substantially contract in the longitudinal direction of the product by an elastic sheet, a thread-like elastic member, etc., and the elastic sheet is arranged in a state where the contraction force is not exerted. It is a concept that excludes parts.

  Drawing 4 is a figure showing typically the state where the disposable diaper concerning an embodiment was equipped, and it is the perspective view seen from the wearer's back. As shown in FIG. 4, the leg opening 35 of the disposable diaper is arranged along the leg circumference by the leg elastic part 75, and the region inside the width direction from the leg opening is formed by the auxiliary elastic part 76 in the product longitudinal direction. Shrink in the direction.

  The disposable diaper can be brought closer to the buttock vicinity side than the abdomen side by the auxiliary stretchable part 76 that is biased and arranged on the rear waistline region side. The contraction area | region by the auxiliary expansion-contraction part 76 can be provided in the position which contact | abuts the side part of the buttock where the amount of expansion and contraction of the skin surface is large by the movement of the wearer, and the disposable diaper can follow the movement of the skin of the buttock.

  Moreover, the space | interval of a wearer's both legs is the shape where the crotch area is the narrowest, and it spreads toward the abdominal side or the back side from a crotch area. Since the leg opening and the leg stretchable part 75 have a shape extending from the crotch region toward the outside in the longitudinal direction toward the outside in the width direction, the leg circumference opening and the leg stretchable part 75 are arranged along the wearer's leg swing. Since it can arrange | position and can suppress local stress concentration, it can contact | adhere to a wearer with a comparatively low elongation rate, and it becomes possible to reduce the burden on skin.

  Furthermore, by providing the auxiliary stretchable part 76 and the leg stretchable part 75 together, the auxiliary stretchable part 76 can bring the diaper to the heel side, and the leg stretchable part 75 can arrange the leg opening along the leg circumference. The disposable diaper can follow the movement of the buttocks while suppressing the extension rate of the leg stretchable part 75. Therefore, compared with the structure which raises the elongation rate of the leg expansion-contraction part 75 and makes a diaper contact | adhere to the leg opening part, the elongation rate of the leg expansion-contraction part 75 can be made low and generation | occurrence | production of a skin trouble can be suppressed.

  Further, the leg stretchable part 75 is arranged along the wearer's leg, and the movement of the leg is transmitted to the entire disposable diaper via the leg stretchable part 75, and the position shift of the absorber 40 may occur. . However, by configuring the extension rate of the auxiliary stretchable part 76 disposed near the absorbent body in the product width direction to be high and configuring the extension rate of the leg stretchable part 75 disposed on the outside in the width direction to be low, the auxiliary stretchable part 76 can expand and contract more positively, can reduce the influence of the movement of the legs transmitted to the absorber, and can suppress the occurrence of displacement of the absorber.

  Moreover, the auxiliary | assistant expansion-contraction part 76 is spaced apart from the leg expansion-contraction part 75 by planar view of a disposable diaper. Since the auxiliary elastic part 76 and the leg elastic part 75 are separated from each other, the auxiliary elastic part 76 and the leg elastic part 75 contract independently without interfering with each other.

  For example, if the auxiliary stretchable part 76 and the leg stretchable part 75 are arranged so as to overlap each other, when the disposable diaper is put on, the auxiliary stretchable part 76 may contract and the disposable diaper may not be placed along the legs. There is. However, since the auxiliary stretchable part 76 and the leg stretchable part 75 are separated from each other, they can function independently. Therefore, it is possible to fit the leg opening portion around the wearer's leg by the leg stretchable portion 75 and to bias the disposable diaper near the buttocks by the auxiliary stretchable portion 76.

  An end 76F on the front waistline region side of the auxiliary stretchable part 76 is disposed closer to the rear waistline than the inner end region 75I in the width direction of the leg stretchable part 75. The crotch region is a portion that faces the wearer's crotch, and the width direction inner end region 75I of the leg stretchable portion 75 is a region that becomes the center in the longitudinal direction of the crotch region. When the inner end region 75I in the width direction of the leg stretchable portion 75 is contracted in the product longitudinal direction by the auxiliary stretchable portion 76, the disposable diaper is brought close to the crotch region 25 and is not effectively brought to the rear waistline region. However, disposing the auxiliary stretchable part 76 behind the widthwise inner end region 75I of the leg stretchable part 75 makes it easier to bring the disposable diaper to the rear waistline region sufficiently.

  The product longitudinal direction outer side edge part of the auxiliary | assistant expansion-contraction part 76 is arrange | positioned inside the product longitudinal direction rather than the trunk periphery holding | maintenance part. Specifically, the front waistline side end portion 76F of the auxiliary stretchable part 76 is disposed closer to the back waistline side than the rear waistline side end part 95R of the target part 95, and the back waistline area of the auxiliary stretchable part 76 The side end portion 76R is disposed closer to the front waistline region than the end portion 90F on the front waistline region side of the fastening tape 90.

  A waistline holding part is a part which hold | maintains a disposable diaper along a wearer's waist, and is arrange | positioned along the width direction. On the other hand, the auxiliary telescopic part 76 is configured to contract in the product longitudinal direction. Therefore, for example, if the auxiliary stretchable part 76 is disposed so as to overlap the waistline holding part, the auxiliary stretchable part 76 may be displaced inward in the longitudinal direction. However, since the outer end in the product longitudinal direction of the auxiliary stretchable part 76 is arranged inside the product longitudinal direction from the waistline holding part, mutual interference is not alleviated and the waistline holding part is placed around the wearer's waistline. Can be placed along.

  Furthermore, the product longitudinal direction outer side edge part of the auxiliary | assistant expansion-contraction part 76 is arrange | positioned rather than the outer side edge part of the product longitudinal direction of the leg expansion-contraction part 75 at the product longitudinal direction inner side. Specifically, the front waistline side end 76F of the auxiliary stretchable part 76 is arranged on the rear waistline side of the front waistline side end 75F of the leg stretchable part 75, and the backline around the auxiliary stretchable part 76 The region side end portion 76R is disposed closer to the front waistline region than the rear waist region side end 75R of the leg stretchable portion 75.

  The leg stretchable part 75 is configured to bend and contract the disposable diaper along the wearer's leg. The product longitudinal direction end part of the leg expansion-contraction part 75 is arrange | positioned so that it may spread in the width direction, and is arrange | positioned in the vicinity of the trunk periphery holding part. Therefore, the product longitudinal direction end part of the leg expansion-contraction part 75 acts so that it may shrink | contract in the width direction with a trunk periphery holding part.

  For example, if the product longitudinal direction end of the auxiliary stretchable part 76 extends outward from the product longitudinal direction end of the leg stretchable part 75 in the product longitudinal direction, the waistline holding part and the leg stretchable part 75 are connected to the auxiliary stretchable part 76. May be pulled inward in the product longitudinal direction, and the positions of the waistline holding portion and the leg stretchable portion 75 may be shifted. However, since the outer end of the auxiliary stretchable part 76 in the product longitudinal direction is located inside the product longitudinal direction of the leg stretchable part 75 in the product longitudinal direction, the waistline holding part and the leg stretchable part 75 in the product longitudinal direction Misalignment can be prevented.

  Moreover, the auxiliary | assistant elastic part 76 is arrange | positioned rather than the 2nd junction part 81B of leg side gathers in the product width direction outer side. The leg side gather is configured such that the contraction portion 84 on the inner side in the width direction from the second joint portion 81B rises toward the wearer with the second joint portion 81B as a base point.

  For example, if the auxiliary stretchable portion 76 is disposed on the inner side in the width direction than the second joint portion 81B, the inner side in the width direction rises by the auxiliary stretchable portion 76 from the second joint portion 81B, and the contraction portion 84 is located on the outer side in the width direction. You may stand up. When the contraction portion 84 rises outward in the width direction, there is a possibility that body fluid leaks outward in the width direction. However, by disposing the auxiliary stretchable part 76 on the outer side in the width direction than the second joint part 81B, the contraction part 84 is easily raised on the wearer side.

  The outer end of the auxiliary stretchable part 76 in the product longitudinal direction is disposed on the inner side in the product longitudinal direction of the contracted part of the leg side gathers in the product longitudinal direction. For example, if the auxiliary expansion / contraction part 76 extends outward in the product longitudinal direction from the contraction part of the leg side gather, the contraction range of the contraction part 84 becomes short, and a gap between the leg side gather and the body is likely to occur. This is because it becomes.

(3) Shape of Crotch Portion Next, the shape of the crotch portion 200 will be described. As described above, the crotch unit 200 includes the crotch expansion / contraction unit 200a. The crotch expansion / contraction part 200a is configured to maintain a flat shape in a part of the crotch region when the disposable diaper is worn rather than other parts of the absorber 40. The crotch part 200 includes a crotch expansion / contraction part 200a that can expand and contract at least in the product longitudinal direction L or the product width direction W.

  The crotch stretchable portion 200a is provided separately from the leg stretchable portion 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 width direction of the absorbent core 40a at the overlapping position is contracted. In this way, by contracting the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200a, the absorbent core 40a contracts, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not contract. Become.

  On the other hand, the absorbent core 40a located in the front waist region and the rear waist region located outside the product longitudinal direction from the crotch stretch part 200a is not shrunk by the crotch stretch part 200a. The crotch 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 does not excessively adhere to the body, and as a result, the crotch part 200 is appropriately disposed along the body. .

  In addition, since the crotch part 200 can be expanded and contracted along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are likely to rise due to the shrinkage of the crotch part 200. Form a flat crotch region along the body. Since the front waistline region and the back waistline region rise from the crotch stretchable part 200a, the fit of the disposable diaper 10 to the wearer is improved.

  Further, the front waistline side end 76F of the auxiliary stretchable part 76 is located on the back waistline side of the front waistline side end 200aF of the crotch stretchable part and on the back waistline side of the crotch stretchable part. It is arranged closer to the front waistline region than the portion 200aR. With the crotch stretchable portion 200a positioned so that the crotch region faces the wearer's crotch, the contracted region contracted by the auxiliary stretchable portion 76 can be placed on the wearer's buttocks.

  The crotch stretchable part 200a is preferably composed of a stretchable sheet. By configuring the crotch stretchable portion 200a 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. The stretchable sheet can be constituted by a stretchable sheet similar to the leg stretchable part 75, for example.

  Further, instead of the stretchable sheet, the crotch stretchable portion 200a may be configured by arranging a plurality of thread-like or 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 200a, 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 200a is preferably 1.2 times or more and 1.8 times or less. In the present embodiment, the expansion rate of the crotch expansion / contraction part 200a is set to 1.4 times. The elongation rate means the degree of expansion in the expansion / contraction direction (product longitudinal direction L) of the crotch expansion / contraction part 200a, and is defined as follows.

The elongation rate means the degree of expansion of the crotch expansion / contraction part 200a 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 200a in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the natural state)
In addition, in this specification, this elongation rate shall be measured as follows, for example.

  First, when the disposable diaper 10 is sealed in a package or the like, the disposable diaper 10 is taken out of the package, and in that state, the atmosphere is 20 ° C. ± 2 ° C. and relative humidity 60% ± 5% RH 60. Leave for a minute and measure the length of the crotch stretch along the stretch direction. This length is defined as “the length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the natural state”.

Second, the length in the stretch direction of the desired region in such a state (ie, the natural state), and the length in the stretch direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness. This length is defined as “the length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the maximum extended state”.
Using these measurement results, the elongation percentage is measured by calculating with the above formula.

Thus, by making the elongation rate of the crotch stretchable part 200a 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 ratio of the crotch expansion / contraction part 200a is 1.2 times or less, the crotch expansion / contraction part 200a is not sufficiently contracted in the natural state, and the disposable diaper 10 is compared with the case where the crotch expansion / contraction part 200a 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 stretchable part 200a is larger than 1.8 times, the shrinkage dimension of the crotch stretchable part 200a in the shrinking direction becomes too large, so that the region where the crotch stretchable part 200a 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 200a 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 200a 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 attaching the disposable diaper 10 to the wearer. The crotch stretchable part 200a can be confirmed to be easily along the wearer's body.

  Here, if the amount of shrinkage of the crotch stretchable part 200a in the product longitudinal direction L is larger than 8%, the crotch stretchable part 200a is shrunk too much, and the length of the disposable diaper 10 in the product longitudinal direction L is insufficient. 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, when the amount of shrinkage of the crotch stretchable part 200a in the product longitudinal direction L is 2% or less, the effect itself of the crotch stretchable part 200a that brings the disposable diaper 10 close to the wearer's body is hardly exhibited.

  Further, the center of the crotch stretchable part 200a in the product longitudinal direction L is arranged on the front waistline region 20 side of the center of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200a 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 in the product longitudinal direction L of the crotch part 200. 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. In particular, it is preferably continuous in the width direction.

  The notch 115 and the notch 125 have longer lengths in the product longitudinal direction L 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.

(4) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated. Note that an existing method can be used as a method not described in this embodiment. 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 thread-like elastic member constituting the auxiliary stretchable part 76, the web constituting the top sheet, etc. Components constituting the disposable diaper 10 such as a web, a leak-proof sheet, and an absorber are placed.

  More specifically, the stretchable sheet constituting the leg stretchable part 75 is stretched, transferred to the intermittent drum while being further displaced in the width direction, and cut into individual product lengths on the intermittent drum. . The interval between the stretchable sheets is provided with the rotation of the intermittent drum, and the stretchable sheet is transferred onto a continuous web. In this way, the leg stretchable portions can be arranged in a curved line.

  In the leg periphery forming step, the top sheet 50 exterior sheet 60 and the back sheet 60a are cut along the widthwise outer end of the leg stretchable part 75. Thereby, the leg opening part 35 arrange | positioned around a wearer's leg is formed.

  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.

(5) Action and effect
The disposable diaper according to the present embodiment includes a leg stretchable part 75 and an auxiliary stretchable part 76, and the auxiliary stretchable part 76 is arranged to be biased toward the rear waistline region, so that it is closer to the hip than the stomach side. The element which comprises a disposable diaper can be brought near to the side. Specifically, the contraction area | region by an auxiliary | assistant expansion-contraction part can be provided in the position which contact | abuts the buttocks side part with a large amount of expansion / contraction of the skin surface by a wearer's motion. Therefore, the disposable diaper can follow the movement of the skin of the buttocks.

  Moreover, the leg expansion / contraction part 75 is arrange | positioned along the leg periphery opening part, and sticks a leg periphery opening part to a wearer's leg periphery. By providing the auxiliary stretchable portion 76 and the leg stretchable portion 75 together, the auxiliary stretchable portion 76 can bring the diaper to the buttock side, and the leg stretchable portion 75 can arrange the leg opening along the leg circumference. The disposable diaper can be configured to follow the movement of the buttocks while suppressing the stretch rate of 75.

  Moreover, the auxiliary | assistant expansion-contraction part 76 is spaced apart from the leg expansion-contraction part 75 by planar view of a disposable diaper. Since the auxiliary elastic part 76 and the leg elastic part 75 are separated from each other, the auxiliary elastic part 76 and the leg elastic part 75 can contract independently without interfering with each other.

  An end portion 76F on the front waistline region side of the auxiliary stretchable portion 76 is disposed on the back waistline region side with respect to the widthwise inner end region located on the innermost side in the product width direction of the leg stretchable portion 75 in the crotch region. Since the auxiliary stretchable part 76 is arranged behind the inner end region in the width direction, it is easy to place the diaper sufficiently in the rear waistline region without bringing the diaper in the crotch region.

  The auxiliary expansion / contraction part 76 is arrange | positioned rather than the 2nd junction part 81B used as the base end part of the rise of leg side gathers in the product width direction outer side. For example, if the auxiliary stretchable portion 76 is disposed on the inner side in the width direction than the second joint portion 81B, the inner side in the width direction rises by the auxiliary stretchable portion 76 from the second joint portion 81B, and the contraction portion 84 is located on the outer side in the width direction. You may stand up. However, by disposing the auxiliary stretchable part 76 on the outer side in the width direction than the second joint part 81B, the contraction part 84 is easily raised on the wearer side.

  Moreover, since the crotch expansion / contraction part 200a is provided in the absorber, the product longitudinal direction end part of the crotch expansion / contraction part 200a becomes an inflection point, and the absorber is easily deformed. In addition, a low-rigidity part is formed inside the product longitudinal direction from the crotch expansion and contraction part, the absorbent core 40a located closer to the front waistline area 20 than the low-rigidity part, and the rear waistline area 30 closer to the low-rigidity part Since the absorbent core 40a located in the position rises from the “bottom” and is easily bent along the roundness of the wearer's body (abdomen and buttocks), the shape of the disposable diaper itself is closer to the shape of the wearer's body. be able to.

  Further, the front waistline side end 76F of the auxiliary stretchable part 76 is located between the front waistline side end 200aF and the back waistline side end 200aR of the crotch stretchable part in the product longitudinal direction. The end 76R on the rear waistline region side of the auxiliary stretchable part 76 extends outward in the product longitudinal direction from the crotch stretchable part 200a. With the crotch stretchable portion 200a positioned so that the crotch region faces the wearer's crotch, the region contracted by the auxiliary stretchable portion 76 can be placed on the wearer's buttocks.

  Since the product longitudinal direction outer side edge part of the auxiliary | assistant expansion-contraction part 76 is arrange | positioned inside a product longitudinal direction rather than the trunk periphery holding part, the trunk periphery holding part and the auxiliary | assistant expansion / contraction part 76 contract without interfering with each other. Therefore, it is possible to arrange the waistline holding part along the wearer's waistline while suppressing the positional shift in the product longitudinal direction of the waistline holding part due to the influence of the auxiliary stretchable part 76.

  Since the product longitudinal direction outer side edge part of the auxiliary | assistant telescopic part 76 is arrange | positioned in the product longitudinal direction inner side rather than the outer side edge part of the product longitudinal direction of the leg elastic part 75, at least the outer edge of the leg elastic part 75 in the product longitudinal direction The part functions without being affected by the auxiliary elastic part 76 and can prevent the position of the leg elastic part 75 in the product longitudinal direction.

(6) 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.

  For example, the auxiliary expansion / contraction part 76 may not be arranged in a straight line but may be arranged in a curved line. Further, the leg stretchable part 75 and the auxiliary stretchable part 76 are spaced apart in the width direction, but may be partly overlapped.

  Further, the front waistline side end portion 76F of the auxiliary stretchable portion 76 may coincide with the widthwise inner end region 75I of the leg stretchable portion 75 in the product longitudinal direction, or the widthwise inner end of the leg stretchable portion 75. It may be arranged on the front waistline region side with respect to the region 75I.

  The auxiliary stretchable part 76 may coincide with the joint part 81B of the leg side gather in the product width direction, or may be disposed on the inner side in the product width direction than the joint part 81B of the leg side gather.

  The front waistline side end of the auxiliary stretchable part 76 may be disposed closer to the front waistline side than the front waistline side end of the crotch stretchable part, or the rear waistline side end of the crotch stretchable part You may arrange | position at the front waist area side rather than the part.

  At least one of the end portion on the front waistline region side of the auxiliary stretchable portion 76 and the end portion on the rear waistline region side of the auxiliary stretchable portion 76 may be disposed on the product longitudinal direction outside of the waistline holding portion. Alternatively, the leg stretchable portion 75 may be disposed on the outer side in the product longitudinal direction than the outer end portion in the product longitudinal direction.

  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 leghole openings by joining the left and right edges of the outer layer sheet forming the front waistline and the back waistline, the outer layers of the front waistline and the back waistline The sheet 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
30 ... rear waist area
35… Leg opening
40 ... absorber
40a ... Absorbent core
40b ... Core wrap
50… Top sheet
60… Exterior sheet
60a… Back sheet
70 ... side flaps
71 ... Elastic member
75 ... Leg stretchable part
75F… The front waistline side of the leg expansion / contraction part
75I ... Inner width region of leg expansion / contraction part
75R ... Leg elastic part at the rear waistline side
76 ... Auxiliary telescopic part
76F… Auxiliary telescopic part at the front waistline side
76R ... Auxiliary telescopic part at the rear waistline side
80… Legside gather
81 ... Junction
81A ... 1st joint part
81B ... Second joint
82 ... Free end
84 ... contraction
85 ... Hip elastic part
90 ... Fastening tape
90F… End of the front waist area of the fastening tape
95 ... Target section
95R ... The rear waistline end of the target
115 ... Notch
125 ... Notch
200 ... Crotch part
200a ... Crotch expansion / contraction part
200aF: Crotch expansion / contraction end on the front waistline side
200aR: Crotch expansion / contraction end on the rear waist area
L: Product longitudinal direction
W ... Product width direction

Claims (7)

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 from the crotch region toward at least one of the front waistline region and the rear waistline region;
A disposable diaper provided with a leg stretchable part arranged along a leg opening provided on the outer side in the product width direction than the absorbent body and stretchable along the product longitudinal direction,
The leg opening and the leg stretchable part extend toward the product width direction outer side from the crotch region toward the product longitudinal direction outer side,
Between the absorber in the product width direction and the leg stretchable part, an auxiliary stretchable part that can shrink along the product longitudinal direction is provided,
The auxiliary stretchable part is arranged biased toward the rear waistline side from the center in the product longitudinal direction,
The disposable diaper in which the extension rate in the product longitudinal direction of the auxiliary stretchable part is higher than the extension rate in the product longitudinal direction of the leg stretchable part.   The disposable diaper according to claim 1, wherein the auxiliary stretchable part is disposed apart from the leg stretchable part in a plan view of the disposable diaper. The leg stretchable part has a width direction inner end region located on the innermost side in the product width direction in the crotch region,
The disposable body according to claim 1 or 2, wherein an end of the auxiliary stretchable part on the front waistline region side is disposed closer to the rear waistline region than the inner end region in the width direction of the leg stretchable part. Diapers. It is disposed on the inner side in the product width direction than the leg stretchable part, and includes a standing leg side stretchable part having a shrinkable part that can be stretched along the product longitudinal direction.
The disposable diaper according to any one of claims 1 to 3, wherein the auxiliary stretchable part is arranged on the outer side in the product width direction with respect to a rising base end part of the leg side stretchable part. In the crotch region, formed in an absorber arrangement region where the absorber is arranged, and includes a crotch expansion / contraction portion that can expand and contract in the product longitudinal direction,
An end of the auxiliary elastic part on the front waistline side is closer to the rear waist than the end of the crotch elastic part on the front waistline side, and the rear waistline side of the crotch elastic part The disposable diaper in any one of Claims 1-4 arrange | positioned rather than the edge part of the said front waist area area side. In the front waistline region and the rear waistline region, the waistline holding portion that holds the disposable diaper on the wearer's body,
The disposable diaper according to any one of claims 1 to 5, wherein an outer end portion in the product longitudinal direction of the auxiliary stretchable part is disposed on an inner side in the product longitudinal direction than the waistline holding portion.   The outer end portion in the product longitudinal direction of the auxiliary stretchable portion is disposed on the inner side in the product longitudinal direction of the leg stretchable portion with respect to the outer end portion in the product longitudinal direction. The disposable diaper described in Crab.

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