JP2014204758A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which can achieve a wearing feeling close to the wearing feeling of underwear and specifically a comfortable fitting feeling as the disposable diaper does not disturb movements of a wearer while maintaining comfort and absorption performance after excretion.SOLUTION: A disposable diaper 10 includes: a leg expanding and contracting part formed along a leg opening part; and a pair of crotch expanding and contracting parts which are respectively disposed on both outer sides in a product width direction relative to a center of the product width direction of an absorber in a crotch area and can expand and contract in a product longitudinal direction or the product width direction. A low expanding and contracting region with a rate of expansion and contraction that is lower than that of the crotch expanding and contracting part is provided between the leg expanding and contracting part and the crotch expanding and contracting part.

Description

  The present invention relates to a disposable diaper having a pair of crotch stretchable parts that can be stretched in the product longitudinal direction or product width direction in the crotch region.

  Conventionally, in a disposable diaper, various devices have been made in order to realize good comfort while preventing leakage of excrement. For example, a disposable diaper is known in which an elastic member is arranged along a leg opening, thereby making it difficult for a compression mark by the elastic member to adhere to the wearer's body (for example, Patent Document 1).

  In addition, such a disposable diaper is generally provided with another elastic member along the waistline opening, and has a structure that tightens the periphery of the leghole opening and the periphery of the waistline opening. Widely used. With such a structure, even if the disposable diaper absorbs excrement or the wearer moves violently, the disposable diaper can be prevented from sagging.

JP 2001-37087 A

  However, the conventional disposable diaper described above has the following problems. That is, the conventional disposable diaper has a structure that mainly tightens the periphery of the leg opening and the periphery of the waist opening, and thus has a problem that it is far from comfort such as underwear.

  In the case of general underwear, the front waistline portion (front body) and the back waistline portion (rear body) are formed of a material that can expand and contract as a whole. On the other hand, the crotch part (the gusset part) is generally not formed of a material that can be stretched so much, and the crotch part is pulled by the front waistline part and the back waistline part so that the crotch part is also the body of the wearer. It is configured to fit.

  However, if a disposable diaper has a structure in which the crotch part is fitted to the body in order to obtain the same comfort as that of underwear, the excrement is kept in contact with the body, which is likely to cause skin problems. Moreover, when the crotch part is fitted to the body, the density of the absorber increases due to the body pressure, the absorption speed of the liquid by the absorber decreases, and the pressure is applied to the absorber due to the movement of the wearer, to the skin. There is also a problem that liquid return occurs.

  Moreover, in the conventional disposable diaper, the space margin (the remainder of cloth | dough) has been given from the trunk periphery holding part to the crotch region. This is because a planar absorbent body is applied to a three-dimensional body with complex irregularities, so it is not possible to follow the changes in the posture of the wearer and the elongation of the skin due to movement unless there is too much in the crotch area. This is because disposable diapers hang down.

  Since there is a space (remaining fabric), it is necessary to fit the periphery of the leg opening without gaps so that there is no gap, and the elastic member placed around the leg has a high expansion / contraction rate. For example, a structure for fastening a disposable diaper to the body is required. That is, tightening becomes strong, and excessive tightening may cause discomfort for the wearer.

  Therefore, the present invention has been made in view of such a situation, while maintaining comfort and absorption performance after excretion, good comfort that is close to underwear, specifically not hindering the wearer's movement The purpose is to provide disposable diapers that can realize a comfortable wearing feeling.

  The disposable diaper according to the present disclosure has a front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region, and from the front waistline region to the back waistline region. An absorbent body having a product longitudinal direction 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, and the front waistline region And in the rear waistline region, extending along the product width direction, a waistline holding portion for holding the disposable diaper on a wearer's body, a pair of leghole openings, and along the leghole openings, A leg stretchable part that extends from the front waistline region to the rear waistline region across the inseam region, and is arranged on both outer sides in the product width direction with respect to the center in the product width direction of the absorbent body in the inseam region. A pair of crotch stretchable parts that can be stretched in the product longitudinal direction or product width direction, the crotch stretchable part being provided apart from the waistline holding part and the leg stretchable part, and the leg stretchable part The gist is that a low expansion / contraction region having a lower expansion / contraction rate than the crotch expansion / contraction part is formed between the portion and the crotch expansion / contraction part.

  According to the features of the present invention, a disposable diaper that can maintain comfort and absorption performance after excretion and can realize a comfortable feeling close to underwear, specifically a good wearing feeling that does not hinder the movement of the wearer is provided. it can.

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 an expansion rear view of the disposable diaper concerning this embodiment. It is an expanded top view of the disposable diaper concerning 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.

  FIG. 1 is a developed plan view of a disposable diaper 10 according to the present embodiment. FIG. 2 is a cross-sectional view of the disposable diaper 10 taken along line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along the line F2-F2 shown in FIG. The developed plan view shown in FIG. 1 shows a state in which the elastic members 71 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the top sheets 50 and the side flaps 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.

  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 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, an air-through fiber nonwoven fabric, a spunbond nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric having a mass of about 10-30 g / m2, or a tissue sheet having a mass of about 10-30 g / m2 can be used.

  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. On the back side (non-skin contact surface side) of the liquid-impermeable back sheet 60a, an exterior sheet 60 made of a nonwoven fabric is provided. Further, an indicator 65 configured to visually change when contacting with moisture is provided on the skin contact surface side from the back sheet.

  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.

  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 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 expansion / contraction portion 200 that is formed in a region overlapping the absorber of the crotch region 25 and that can expand and contract in the product longitudinal direction L. Specifically, the crotch expansion / contraction part 200 is disposed in the crotch region 25. The configuration of the crotch expansion / contraction unit 200 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 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 periphery opening part 35 can be expanded-contracted in a product longitudinal direction, and may be arrange | positioned along the leg periphery opening part 35, and one part is a leg periphery opening part. It may be arranged in an inclined state with respect to 35.

  The leg stretchable portion 75 is a portion that is substantially shrunk in the longitudinal direction of the product by the stretchable sheet or the like, and is a concept that excludes a portion where the stretchable sheet is disposed in a state where the shrinkage force is not exerted. The configuration of the leg expansion / contraction part 75 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.

  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. 2) 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 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 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.

  Among 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 from the contraction portion 84 is between the crotch stretch portion 200 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 elastic part 85 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. 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 this 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 elastic part is not particularly limited. However, it is preferably arranged on the non-skin contact surface side with respect to 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.

  The absorber 40 in the rear waistline region is provided with a notch 110 as a low-rigidity area that has a lower basis weight than other parts of the absorber or does not have the absorbent core 40a. The notch 110 has a shape in which the length in the product width direction gradually decreases from the product width direction center of the end portion on the rear waist region side of the absorber 40 toward the front waist region side. More specifically, it has a wedge shape in a plan view of the disposable diaper. Further, the boundary between the absorbent core 40a and the notch 110 is formed by an arc that is convex toward the center in the product width direction W. The absorber 40 on the outer side in the product width direction than the notch 110 has a trapezoidal shape that protrudes toward the end on the rear waistline region side.

  A part of the notch 110 is disposed so as to overlap with the waist elastic part 85 in a plan view of the disposable diaper. In the present embodiment, the waistline stretchable part 85 is disposed so as to overlap a part of the notch 110, but the waistline stretchable part 85 may be disposed so as to overlap the notch 110.

  By forming such a notch 110, the notch 110 does not hinder expansion and contraction of the waist elastic part 85, and even if the waist elastic part 85 contracts, the notch 110 narrows and the product width is larger than the notch 110. Since the interval between the absorbent bodies on both sides in the direction becomes narrow, the absorbent body 40 is unlikely to rise in an unintended shape. Note that the notch 110 is preferably narrower than the width of the waist extension / contraction part 85 in consideration of prevention of leakage of excrement.

  Further, when the absorber 40 is contracted in the product width direction W by the waist stretchable portion 85 and the interval between the absorbers on both sides of the product width direction becomes narrower than the notch 110, the rear waistline region 30 side of the notch 110 Since the part closer to the end of the body is closer to the center of the product width direction W than the part closer to the crotch region 25, the contraction amount in the product width direction W is reduced between the part on the rear waistline region 30 side and the part closer to the crotch region 25. A difference occurs, and the rear waistline region 30 comes to stand.

  That is, since the waist stretchable portion 85 and the wedge-shaped notch 110 that can be stretched in the product width direction W are provided, a cup shape in which the disposable diaper 10 swells on the non-skin surface side is easily formed when the disposable diaper 10 is mounted. .

  In the present embodiment, the notch 110 does not have the absorbent core 40a, and the waist stretchable portion 85 exists so as to overlap the notch 110, so that the rear waistline region 30 side in the product longitudinal direction L is present. Since the portion closer to the end is closer to the center of the product width direction W than the end position of the absorbent core 40a and the rise of the rear waistline region 30 becomes more prominent, the cup shape can be formed more stably.

  In the present embodiment, the waist stretchable portion 85 exists beyond the side edge in the product width direction W of the absorbent core 40a, so that the rear waistline region in the product longitudinal direction L while forming the disposable diaper 10 in a cup shape. About the absorptive core 40a of a position from the edge part side of 30 side, it can be made to follow a wearer's body positively. Further, at least a part of the waist elastic part 85 and the notch 110 are present in a region extending in the width direction from the pair of fastening tapes 90. Therefore, even when the disposable diaper 10 is worn with the disposable diaper 10 laid down and the wearer is laid down, the waist stretchable portion 85 that exists beyond the side edge in the product width direction W of the absorbent core 40a is worn. It is not laid under the person's body. Therefore, by pulling the fastening tape 90, the side edge of the waist stretchable portion 85 extends, and it becomes easier to position the body more reliably than the cup-shaped waist side.

  In the present embodiment, the absorbent core 40a on the outer side in the product width direction from the notch 110 is convex toward the rear waistline region. Therefore, as described above, in addition to facilitating the formation of a cup shape in which the disposable diaper 10 swells on the non-skin surface side, the surface area of the absorbent core 40a is maintained, so excretion from the end of the absorbent core 40a It can prevent leakage of things.

  In the present embodiment, the notch 110 has a wedge shape, and the boundary between the absorbent core 40a and the notch 110 is an arc that protrudes toward the crotch region 25. The radius of the arc is 50 mm to 200 mm. For this reason, the width of the notch 110 in the product width direction W increases nonlinearly as it goes to the end portion on the rear waistline region 30 side in the product longitudinal direction L, and the rise of the rear waistline region 30 becomes more prominent. It is easy to form a cup shape more stably. Furthermore, since the boundary between the absorbent core 40a and the notch 110 is an arc that protrudes toward the inseam area 25, the rear waistline area 30 becomes a round cup shape due to the shrinkage of the notch 110, and the wearer The shape is easy to follow along the rounded buttocks.

  Further, since the notch 110 is formed, the end of the absorber 40 on the rear waist region side is formed with a convex shape toward the rear region on the left and right sides. Since this absorbent body shape is reminiscent of placing a butt, there is an effect that the user can more easily adjust the diaper to the correct position for the wearer.

  The bending stiffness in the present embodiment is based on a stiffness value based on the Taber method (JISP8125), and is measured by the following method. First, with the disposable diaper deployed, a sample (for example, an absorber) of a portion to be measured for bending rigidity is collected. The sample has a size of 70 mm in the product width direction × 38 mm in the product longitudinal direction for the measurement target portion. If the sample includes an elastic elastic member, the elastic member is removed. Note that a Taber stiffness tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. is used as a tester for measuring the rigidity value. Moreover, the number of samples is 10, and it measures about each sample and makes the average value the rigidity value.

  The measurement procedure is as follows (a) to (e).

  (A) The thickness (A) of the collected sample is measured.

  (B) Next, the sample is sandwiched to such an extent that it touches the center of the chuck (lower side) of the testing machine.

  (c) The sum of the left and right gaps between the support roller and the sample is adjusted to (A) × 0.80 (mm).

  (d) The auxiliary weight is appropriately selected so that the indicated load scale falls within the range of 15 to 85% of the maximum scale.

  (e) Rotate the sample in both the left and right directions, stop at the point where the 15 ° support line and the center mark of the pendulum coincide, and read the scale on the testing machine. The numerical value on the left side of the scale is (B), and the numerical value on the right side of the scale is (C).

  The rigidity value is obtained by the following equation.

Formula: Rigidity value (mN · m) = (((B) + (C)) / 2) × (auxiliary weight coefficient) × 9.81 × 10 ⁻²
If the width of the test piece cannot be 38 mm, it is converted into a bending moment of 38 mm width.

  The higher the rigidity value measured in this way, the higher the bending rigidity, and the lower the rigidity value, the lower the bending rigidity.

  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 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 (total basis weight in the case of a plurality of sheets) of the nonwoven fabric constituting the base sheet 91 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 backsheet 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.

  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 on the innermost side in the crotch region. The leg opening 35 and the leg stretchable part 75 extend toward the outer side in the product width direction from the crotch region 25 toward the outer side in the product longitudinal direction, particularly in the rear waistline region. 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. In the present embodiment, the region in which the position in the width direction of the leg opening 35 is located on the innermost side in the crotch region coincides with the width direction inner end region 75I of the leg stretchable portion 75, but does not necessarily coincide. It does not have to be.

  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 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 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 rate of the leg stretchable part 75 is preferably 1.6 to 2.3 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, and is defined as follows.

Elongation rate = (length of leg stretchable part in stretched state) ÷ (length of leg stretchable part in 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 also including the exterior sheet joined to a leg expansion-contraction part. The elongation rate of the leg stretchable part after cutting is measured, and the stretch rate of the leg stretchable 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 length of the leg stretch part is measured along the stretch direction. This length is defined as “the length of the leg expansion / contraction 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”.

  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.

  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.

  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 | maintenance part.

  Next, the shape of the crotch expansion / contraction 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 portions 200 are respectively disposed on both outer sides in the product width direction with respect to the center of the absorbent body in the product width direction in the crotch region. The crotch expansion / contraction part is separated from the waistline holding part and is separated from the leg expansion / contraction part.

The crotch stretchable portion 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W. A low expansion / contraction region having a lower expansion / contraction rate than the crotch expansion / contraction portion is formed between the leg expansion / contraction portion and the crotch expansion / contraction portion.

  A low expansion / contraction area | region is an area | region where the expansion / contraction rate is lower than the expansion / contraction rate of a leg expansion-contraction part, and is lower than the expansion / contraction rate of a crotch expansion / contraction part. In the present embodiment, the region is located on the inner side in the product width direction than the leg elastic part 75 and on the outer side in the product width direction than the crotch elastic part 200. In this region, the leg stretchable part 75 is not disposed, and the stretchable sheet constituting the crotch stretchable part 200 is not disposed, and the stretch rate is lower than that of the leg stretchable part 75 or the like.

  The expansion / contraction rate means the degree of expansion / contraction and is defined as follows.

Expansion rate = (length at maximum extension) / (length in the natural state)
The expansion / contraction rate is measured as follows.

  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 this state of the disposable diaper 10, that is, the length of the natural state, is set so as to be along the measurement target part using a spring measure (tape: glass fiber-containing vinyl chloride coating) manufactured by Shinwa Measurement Co., Ltd. The length 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 is measured. Here, the above-mentioned measurement was performed on 10 samples, and the average value was defined as the above-mentioned length.

  Hereinafter, the “length” in this specification is measured by the above-described measurement method.

  As shown in FIGS. 1 and 2, in the disposable diaper 10 according to the present embodiment, in the natural state, the crotch stretchable part 200 may be symmetrical about the center line in the product width direction W. The difference between the left and right widths of the crotch stretchable part 200 may be within 10% with the center line in the width direction W as a boundary.

  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 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 on the crotch part of the disposable diaper in a state of being held around the waist and waist of the wearer by the fastening tape, without excessively adhering to the body, results in the crotch. The stretchable part 200 is appropriately placed along the body.

  According to such a disposable diaper 10, the crotch expansion / contraction part 200 can be brought close to the wearer's body while maintaining an appropriate distance from the wearer's body by the substantially flat crotch expansion / contraction part 200. And absorption performance can be maintained. Further, it is possible to realize a comfortable feeling close to underwear, specifically a good wearing feeling that does not hinder the movement of the wearer. In other words, in the disposable diaper 10, the gusset part (bottom part) is clearly provided, and the disposable diaper 10 is three-dimensionally placed on the wearer's body, thereby reducing the tightening by an excessive elastic member. That is, in the disposable diaper 10 in which such a “bottom part” is formed, the crotch stretchable part 200 comes close to the body, so that it can be fitted without tightening the leg circumference, and the crotch stretchable part exists in the original sense. (The front waistline area 20, the crotch area 25 and the back waistline area 30 can each be along the body).

  On the other hand, in a conventional disposable diaper, there is substantially no front body and no back body, and when worn, the crotch stretchable part tends to exist at a position away from the wearer's crotch. For this reason, it will be in the state in which an absorber exists further below the position pinched | interposed into a wearer's right and left thigh. In this case, the absorbent body sandwiched between the wearer's thighs moves back and forth and right and left following the movement of the wearer's legs, and the fibers and superabsorbent polymer constituting the absorbent body are moved to the center. If the fibers and superabsorbent polymer that make up the absorbent body are moved to the center, the space between the crotch part of the wearer and the crotch expansion / contraction part of the disposable diaper will be buried, and there will be less space for holding excrement. In addition, there is a problem that the absorption speed is lowered due to the increase in the density of the absorbent body in the crotch region. According to the disposable diaper 10, such a problem can be solved.

  In addition, when a romper that is often worn by infants and toddlers is used, the crotch expansion / contraction part of the disposable diaper gets in the way when the front waistline side and the back waistline side are locked with a hook or the like at the crotch part of the romper. However, according to the disposable diaper 10, such a problem can be solved because the crotch expansion / contraction part 200 is not separated from the crotch part more than necessary even in the mounted state.

  Further, the end of the free end portion 82 of the leg side gather 80 in the product longitudinal direction L is joined to the top sheet 50. The joint portion 81 is disposed between the crotch stretchable portion 200 and the leg stretchable portion 75 in the product width direction W.

  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 easily raised by contraction 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 100 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.

  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. 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 200 may be configured by arranging a plurality of thread-like or band-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 is defined in the expansion / contraction direction (product longitudinal direction L in the present embodiment). It means the degree of expansion of the crotch expansion / contraction part 200 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, 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 200 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 portion 200 in the maximum expansion 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 200 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.

  In other words, when the expansion / contraction ratio of the crotch expansion / contraction part 200 is 1.2 times or less, the crotch expansion / contraction part 200 is not sufficiently contracted in the natural state, and compared to the case where the crotch expansion / contraction part 200 is not provided, disposable diapers The shrinkage of the absorber region at the 10 crotch is small, and it becomes insufficient to take a flat shape along the body at the wearer's crotch.

  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 amount of the crotch stretchable part 200 in the product longitudinal direction L may be configured to be 2% or more and 8% or less of the length of the disposable diaper 10 in the product longitudinal direction L.

  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 inventor attaches the disposable diaper 10 to the wearer when the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is 2% or more and 8% or less of the length of the disposable diaper 10 in the product longitudinal direction L. In the process of doing, 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, when the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is less than 2%, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 close to the wearer's body is hardly exhibited.

  Further, 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. 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.

  In addition, since the crotch expansion / contraction part 200 is provided in a pair divided in the product width direction, the outer end of the absorbent body in the product width direction can be locally shrunk. Furthermore, the notches 115 and 125 formed in the absorber can be locally shrunk. For this reason, the outer end of the absorbent body in the width direction of the absorbent body is locally shrunk while restraining the portion passing through the center of the wearer's body in the width direction (the line from the crevice of the navel to the buttocks to the spine) from shrinking. A “bottom” can be formed opposite the crotch of the person.

  Furthermore, since the crotch stretchable part 200 is divided in the product width direction, a difference in rigidity is generated between the pair of crotch stretchable parts 200 and the region between the pair of crotch stretchable parts 200. The deformation of the absorber can be absorbed in a region between the pair of crotch expansion / contraction parts 200 having relatively low rigidity while forming the “bottom part” by the crotch expansion / contraction part 200 having relatively high rigidity. In order to absorb the deformation of the absorber in the region between the pair of crotch expansion / contraction portions 200 having relatively low rigidity, even if the absorber is greatly deformed, the absorber does not bend significantly in the product width direction and is gently The “bottom” is formed while being rounded in the product width direction. Therefore, the crotch area of the disposable diaper becomes easier to follow along the body, and the uncomfortable feeling at the time of wearing can be suppressed.

  In the extended state where the disposable diaper is extended, the length in the product width direction of each crotch stretchable part is preferably 25 mm or more. Since the length of each crotch stretchable part in the width direction is 25 mm or more, the “bottom part” can be formed by the crotch stretchable part 200 having relatively high rigidity.

  In the extended state where the disposable diaper is extended, the length in the product width direction of the region of the pair of crotch stretchable parts is preferably 10 mm or more and 30 mm or less. If the length in the product width direction of the pair of crotch stretchable regions is less than 10 mm, the deformation of the absorber cannot be sufficiently absorbed. If the length of the pair of crotch stretchable parts in the product width direction is longer than 30 mm, the area that does not shrink (not the bottom) between the crotch stretchable parts 200 widens, and the crotch stretchable part 200 removes disposable diapers. The effect of lifting to the wearer side cannot be exhibited sufficiently.

  Furthermore, generally, the disposable diaper is folded in half in the product longitudinal direction, and when the wearer or the like takes out the disposable diaper from a package or the like, the disposable diaper becomes a half-folded fold portion. Grab the center of the direction. In particular, the center in the product width direction of the fold portion that is folded in two is often gripped. At this time, if the rigidity of the portion held by the wearing assistant is high, a sense of discomfort with respect to the disposable diaper may occur. However, since the area between the pair of crotch expansion / contraction parts 200 is located in the center of the fold portion of the fold, the rigidity is lower than the area where the crotch expansion / contraction part 200 is provided. A sense of incongruity can be suppressed.

  Moreover, compared with the outer side edge part of the product width direction of a crotch area, the space of the center of the crotch area of a disposable diaper becomes large between a wearer without approaching a wearer. Therefore, it becomes difficult to press the boy's genitals.

  The indicator 65 extends in the product longitudinal direction L between a pair of crotch expansion / contraction portions 200 described later, and is made of a color change agent that visually changes when it comes into contact with moisture.

  In addition, when the crotch expansion / contraction part 200 is attached along the wearer's body (lower crotch), the indicator 65 can stably exist at a position close to the wearer's excretion opening.

  As a result, it is possible to avoid a situation in which the indicator 65 is biased and discolored or a situation in which the indicator 65 is discolored only on the wearer's back side.

  Furthermore, since the wearer's excretion opening and the crotch expansion / contraction part 200 are close when worn, the first indicator 65 can be stably discolored in the crotch region 25 of the disposable diaper 10.

  As shown in FIG. 4, a plurality of such indicators 65 may be configured to extend in parallel with a virtual line extending in the product longitudinal direction through the center line in the product width direction W.

  Here, the crotch stretchable portion 200 is provided in a region where the length of the absorbent core 40a in the product width direction W is shorter than a predetermined length. The indicator extends outward in the product longitudinal direction from the crotch expansion / contraction part 200.

In the region where the length of the absorbent core 40a in the product width direction W is shorter than the predetermined length, the absorbent 40 has a small absorption capacity, so that the excrement fluid of the wearer is absorbed by the absorber 40 in this region. Therefore, it is likely to be absorbed by the absorber 40 on the front waistline region 20 side and the back waistline region 30 side in the product longitudinal direction L of such a region. As a result, the discoloration of the indicator 65 easily propagates from the region to the front waistline region 20 side and the rear waistline region 30 side.
Further, when the crotch stretchable part 200 is formed of a liquid-impermeable stretchable sheet, the indicator 65 is disposed on the skin contact surface side of the stretchable sheet. On the other hand, when the crotch stretchable portion 200 is formed of a liquid-permeable stretchable sheet, the indicator 65 is disposed on the non-skin contact surface side of the crotch stretchable portion 200.

Note that the change (discoloration) of the indicator 65 described above is visible from the non-skin contact surface side of the disposable diaper 10. For example, when the indicator 65 is disposed on the skin contact surface side of the stretchable sheet, the light transmittance of the stretchable sheet is preferably 60% or more and 87% or less. According to such a configuration, the change (discoloration) of the indicator 65 can be visually recognized from the non-skin contact surface side of the disposable diaper 10.
In addition, at least a part of the indicator is disposed between the pair of crotch stretchable parts. Since the area provided with the crotch expansion / contraction part is contracted by the crotch expansion / contraction part, fine irregularities are formed on the surface of the disposable diaper. On the other hand, in the region between the pair of crotch stretchable parts, irregularities are formed due to contraction of the surroundings (crotch stretchable part). The unevenness formed in the region between the pair of crotch expansion / contraction portions has a larger interval between the unevennesses and the number of unevennesses than the unevenness formed in the crotch expansion / contraction portions. Furthermore, the height of the unevenness formed in the region between the pair of crotch stretchable portions is smaller than the unevenness formed in the crotch stretchable portion.

  For example, if the indicator and the crotch expansion / contraction part overlap, there is a possibility that the visibility of the indicator may be reduced due to fine wrinkles. However, since at least a part of the indicator is disposed in a region between the crotch stretchable parts, the visibility of the indicator can be secured without being affected by the unevenness of the crotch stretchable part.

  Moreover, the area | region between a pair of crotch expansion-contraction part cannot maintain a flat shape by the crotch expansion-contraction part, but is arrange | positioned along the body at curve shape. The indicator between the pair of crotch expansion / contraction parts can be easily arranged along the body line, and visibility from various angles can be secured.

As a result, it is possible to notify an appropriate replacement timing of the disposable diaper 10 while suppressing excessive replacement of the disposable diaper 10.
In the first embodiment, the crotch stretch unit 200 is formed astride a virtual product centerline VL _T. Virtual product center line VL _T is an imaginary line extending along the product width direction W through the center C _T of the disposable diaper 10 in the product longitudinal direction L. In a developed plan view of the disposable diaper in FIG. 5 shows a virtual product center line VL _T like.

  The disposable diaper 10 has a double fold line FL extending along the product width direction W. For example, the disposable diaper 10 is enclosed in a package in a state in which the disposable diaper 10 is folded in two with respect to the folding line FL. The double fold line FL is formed at a position overlapping the crotch stretchable part 200 in the crotch region 25.

The virtual product center line VL _T, in case the disposable diaper 10 (elastic member 71) is extended state, it should be noted that a virtual line passing through the center C _T of the disposable diaper 10 in the product longitudinal direction L is there. The double fold line FL preferably passes through the center of the disposable diaper 10 in the product longitudinal direction L when the disposable diaper 10 (elastic member 71) is in a contracted state. Thus, in the extended state of the disposable diaper 10, folded line FL is preferably in the product longitudinal direction L is provided rearward of the imaginary product centerline VL _T. Accordingly, in the state where the disposable diaper 10 is folded in two, the rear end portion of the rear waistline region 30 and the front end portion of the front waistline region 20 are easily aligned.

In particular, when the disposable diaper 10 is in an extended state, in the product longitudinal direction L, the virtual product from a center line VL _T to the end of the back waistline region 30 length and the virtual product center line VL _T from the front waist region the length to the end of the 20 is represented by "L _H", the length of the folded line FL to the end of the back waistline region 30 is represented by X, the crotch stretch unit 200 from the virtual product center line VL _T length to the front end portion is represented by Af of the virtual product center line length from VL _T to the rear end portion of the crotch stretch unit 200 is represented by Ab, 2 fold line from the virtual product center line VL _T Consider the case where the length to FL is represented by X. Further, consider a case where the expansion rate of the crotch expansion / contraction part 200 is represented by “t” and the range defined by the product thickness of the part overlapping the double fold line FL is represented by P.

In such a case, ± = [[L _H −Af (t−1) / t] − [L _H −Ab (t−1) / t]} × 1/2 × t from a position satisfying the relationship A fold line FL is preferably formed within the range of P. In the state where the disposable diaper 10 is folded in two by forming the double fold line FL at a position satisfying the above-described relationship, the rear end portion of the rear waistline region 30 and the front end portion of the front waistline region 20 are It's aligned.

Thus, in 1st Embodiment, the crotch expansion-contraction part 200 is formed in the position which overlaps with the absorber 40 in the crotch region 25. FIG. Also, the crotch stretch unit 200 is formed astride a virtual product center line VL _T, it overlaps the folded line FL.

  Therefore, the crotch stretchable part 200 can be stretched in the product longitudinal direction L, and is formed at a position overlapping the absorbent core 40a in plan view. As a result, in the state where the front waistline region 20 and the back waistline region 30 are held on the wearer's body, the crotch region 25 including the two-fold line FL is contracted by the wearer's body together with the absorbent core 40a. Lifts up as you approach the body. Therefore, the gap between the disposable diaper 10 and the wearer is suppressed at the folding line FL. In addition, by suppressing the generation of a gap by the contraction force of the crotch expansion / contraction part 200, the absorbent core 40a of the disposable diaper 10 is conventionally randomized by the contraction force of the elastic member 71 such as the leg expansion / contraction part 75 or the leg side gather 80. Can be collected in the crotch expansion / contraction part 200, and the recumbency generated by the contraction force of the elastic member 71 such as the leg expansion / contraction part 75 or the leg side gathers 80 is worn by the crotch expansion / contraction part 200. It is lifted up to get closer to the body. Thereby, the clearance gap between the disposable diaper 10 and a wearer is suppressed.

  Thus, even if it is a case where the disposable diaper 10 is folded and enclosed in the package, the front waistline is suppressed while suppressing a gap generated between the disposable diaper 10 and the wearer when the disposable diaper 10 is worn. Deviation in the crotch direction of the region 20 and the rear waistline region 30 can also be suppressed.

In the first embodiment, the virtual crotch center line VL _C is provided in front of the imaginary product centerline VL _T. Virtual crotch center line VL _C passes through the center C _C of the crotch stretch unit 200 in the product longitudinal direction L, and a virtual line extending along the product width direction W.

Thus, in the first embodiment, the virtual crotch center line VL _C is provided in front of the imaginary product centerline VL _T, 2 fold line FL is rearward of the virtual product center line VL _T Provided. That is, the crotch expansion / contraction part 200 is provided so as to be biased toward the front side of the disposable diaper 10 in the product longitudinal direction L. Therefore, the crotch stretchable part 200 is lifted so as to approach the wearer, and the crotch stretchable part 200 is disposed at a position corresponding to the crotch region of the wearer. In such a state, since the crotch stretchable part 200 is biased to the front side, the height of the front end portion of the front waistline region 20 and the rear side of the rear waistline region 30 in a state where the disposable diaper 10 is attached to the wearer. The disposable diaper 10 is easy to align, and the wearer's body is not subject to the front and back, and the buttocks located on the dorsal side is longer than the ventral side, so that the disposable diaper 10 fits the wearer's body characteristics. It is possible to wear.

  Moreover, also in the case where the disposable diaper 10 is enclosed in the package, the height of the front end portion of the front waistline region 20 and the height of the rear end portion of the rear waistline region 30 are easily aligned. Therefore, the disposable diaper 10 is suppressed from being broken in the package, and the formation of a broken line at a position where the disposable diaper 10 does not overlap the crotch stretchable part 200 is suppressed. Therefore, the clearance gap between the disposable diaper 10 and a wearer can be suppressed.

  In 1st Embodiment, the absorptive core 40a has the duplication site | part which overlaps with the crotch expansion-contraction part 200, the front side site | part provided in front of an duplication site | part, and the rear site | part provided in the back side rather than an duplication site | part. In the product width direction W, the width of the overlapping portion is smaller than the width of the front portion and the width of the rear portion. In this way, by narrowing the width of the absorbent core 40a in the portion overlapping with the crotch stretchable part 200, the folds of the absorbent core 40a caused by the contraction force of the crotch stretchable part 200 are less likely to be caught on the leg roll of the wearer, The clearance gap between the disposable diaper 10 and a wearer can be reduced more reliably.

  Here, at the position overlapping with the double fold line FL, the width of the crotch stretchable 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.

  Preferably, the width of the crotch expansion / contraction part 200 in the product width direction W is 80% or more of the width of the absorbent core 40a in the product width direction W at a position overlapping the fold line FL. Thereby, in the position which overlaps with the double fold line FL, the absorptive core 40a can be lifted by the contraction force of the crotch expansion / contraction part 200, and the clearance gap between the disposable diaper 10 and a wearer can be reduced more reliably. In addition, it is preferable that the space | interval mentioned above is provided in the outer side of the crotch expansion-contraction part 200 in the product width direction W equally.

  In the part where the crotch stretchable part 200 and the absorbent core 40a overlap, the width of the crotch stretchable part 200 in the product width direction W is preferably narrower than the width of the absorbent core 40a in the product width direction W. Accordingly, the end of the absorbent core 40a in the product width direction W is unlikely to contract due to the contraction force of the crotch expansion / contraction part 200. Accordingly, the flexibility of the end portion of the absorbent core 40a in the product width direction W is relatively maintained, and the end portion of the absorbent core 40a also hits the wearer's leg in the product width direction W. It is difficult for the wearer to remember the uncomfortable feeling associated with the shrinkage.

  For example, when the width of the absorbent core 40a is 120 mm at the position overlapping with the double fold line FL, the width of the crotch stretchable part 200 is preferably 60 to 110 mm. More preferably, the width of the crotch expansion / contraction part 200 is 90 to 110 mm.

  Thus, in the first embodiment, the width of the crotch expansion / contraction 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 at the position overlapping the double fold line FL. . 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. By realizing such lifting of the absorbent core 40a at a position overlapping with the double fold line FL, the gap between the disposable diaper 10 and the wearer can be reduced. When the width of the crotch stretchable part 200 in the product width direction W is 80% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W at the position overlapping the double fold line FL, the disposable diaper 10 And the gap between the wearer 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 described above. On the other hand, if the width of the crotch expansion / contraction part 200 is too wide compared to the width of the absorbent core 40a, the part where the absorbent core 40a is not disposed contracts, and the outside of the crotch expansion / contraction part 200 in the product width direction W is contracted. The rigidity of the part increases. Accordingly, the crotch stretchable part 200 is easily caught on the wearer's thigh. Moreover, when the crotch expansion / contraction part 200 is provided in the site | part in which the absorptive core 40a is not arrange | positioned, the site | part in which the absorptive core 40a is not arrange | positioned rather than the site | part in which the absorptive core 40a is arrange | positioned. The disposable diaper 10 is mounted in a contracted state. 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.

  The interval in the product width direction W between the end portion in the product width direction W of the absorbent core 40a and the inner end portion in the product width direction W of the leg stretch portion 75 in the arrangement region of the crotch stretchable portion 200 is 30 to 60 mm. Preferably there is. As a result, when the crotch stretchable part 200 approaches the wearer's body, the leg stretchable part 75 also easily fits around the leg (body), and even if the wearer moves, the crotch stretchable part 200 and the wearer's body The gap between the body is difficult to occur.

The narrowest part width of the absorbent core 40a in the product widthwise direction W is is preferably provided in 10~60mm front with respect to the virtual product centerline VL _T. Preferably, the width is the narrowest portion of the absorbent core 40a in the product width direction W is provided 20~40mm front with respect to the virtual product centerline VL _T. 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.

  Here, the position where the left and right thighs of the wearer are closest to each other is the front side 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.

    Here, the tension coefficient of the crotch expansion / contraction part 200 may be configured to be larger than the tension coefficient of the leg expansion / contraction part 75.

  The tensile coefficient is a coefficient that defines how much each part is easily stretched. For example, the tensile modulus can be calculated by the following method.

  First, from the product to be measured (disposable diaper 10), the part to be measured (crotch stretchable part 200 and leg stretchable part 75) is cut out as a sample as it is.

  Specifically, the non-stretchable member joined to the crotch stretchable part 200 and the leg stretchable part 75 is cut out. Here, in the area | region where the absorber is arrange | positioned, it cuts out with the absorber.

  Secondly, the cut sample is left in a natural state at 20 ° C. in a 60 RH atmosphere for 60 minutes without applying a tensile load.

  Third, a line L is drawn at the center position in the width direction perpendicular to the stretching direction along the stretching direction of the sample, and the length of the line L in the natural state is measured. At this time, a line L is drawn on a horizontal trapezoid as much as possible without applying a load to the sample, and the length of the line L is measured. Here, let the length of the line L be the initial length “A”.

  In addition, it is preferable to draw the line L so as to be as long as possible in the sample in order to reduce the measurement error, but it is necessary to prevent the line L from being overlapped with the portion sandwiched by the chuck of the next tensile tester. There is.

  Fourth, the tensile tester such as an autograph manufactured by Shimadzu Corporation holds both ends of the sample in the direction of expansion and contraction, and the sample is extended until a load of 0.8 N is applied. And measure the length of the line L in such a state as “A ′”.

  For example, in a tensile tester, the sample is pulled along the stretching direction of the sample at a pulling speed of 100 mm / min (pulling vertically upward with respect to the horizontal plane).

  Fifth, the tensile modulus is calculated by the following formula.

Tensile modulus = (A'-A) / A
Here, the end E2 on the front waistline region 20 side in the range that can be expanded and contracted in the leg stretchable part 75 is more than the end E3 on the front waistline region 20 side in the range that can be expanded and contracted in the crotch stretchable part 200. You may be comprised so that it may adjoin to the edge part E4 by the side of the front waist area 20 side.

  Further, the end E5 on the rear waistline region 30 side in the range that can be expanded and contracted in the leg stretchable part 75 is behind the disposable diaper 10 than the end E6 on the rear waistline area 30 in the range that can be expanded and contracted in the crotch stretchable part 200. You may be comprised so that it may adjoin to the edge part E7 by the side of the waist area 30. FIG.

  Thus, by defining the relationship between the tensile coefficient and the end portions E2 to E7, when the disposable diaper 10 is pulled in the product longitudinal direction L, the leg stretchable portion 75 is stretched while the crotch stretchable portion 200 is stretched. The state which does not carry out can be maintained.

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, disposable diapers such as a stretchable sheet constituting the leg stretchable part 75, another web such as a web constituting the top sheet, a leakproof sheet, an absorber, etc. on the web constituting the backsheet The component which comprises 10 is mounted.
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, the exterior sheet 60, and the back sheet 60a are cut along the outer end in the width direction 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.

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
65 Indicator
70 ... side flap
71 ... Elastic member
75 ... Leg stretchable part
75I ... Inner width region of leg expansion / contraction part
80… Legside gather
81 ... Junction
81A ... 1st joint part
81B ... Second joint
82 ... Free end
84 ... contraction
85 ... Hip elastic part
90 ... Fastening tape
91 ... Base sheet
92 ... Hook sheet
95 ... Target section
110 ... Notch
115 ... Notch
125 ... Notch
200 ... Crotch expansion / contraction part
L: Product longitudinal direction
W ... Product width direction

Claims (10)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
The product longitudinal direction from the front waistline region to the rear waistline region, and the 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;
In the front waistline region and the rear waistline region, a waistline holding portion that extends along the product width direction and holds the disposable diaper on a wearer's body;
A pair of leg openings,
A leg stretchable part formed so as to extend from the front waistline area to the rear waistline area across the crotch area along the leg opening.
A pair of crotch expansion and contraction portions disposed on both outer sides of the product width direction with respect to the center of the product width direction of the absorbent body in the crotch region, and capable of expanding and contracting in the product longitudinal direction or the product width direction,
The crotch stretchable part is provided separately from the waistline holding part and the leg stretchable part,
A disposable diaper in which a low expansion / contraction region having a lower expansion / contraction rate than the crotch expansion / contraction part is formed between the leg expansion / contraction part and the crotch expansion / contraction part. It is equipped with an indicator that is configured to change visually when in contact with moisture,
The disposable diaper according to claim 1, wherein at least a part of the indicator is disposed between the pair of crotch stretchable parts.   The disposable diaper according to claim 1 or 2, wherein a length of each crotch stretchable part in the product width direction is 25 mm or more in an extended state where the disposable diaper is extended.   The disposable diaper according to any one of claims 1 to 3, wherein a length of the pair of crotch stretchable regions in the product width direction is 10 mm or more and 30 mm or less in an extended state where the disposable diaper is extended. Leg side gathers extending along the longitudinal direction of the product,
A top sheet provided on the skin contact surface side of the absorbent body,
The leg side gather has a joining portion joined to the absorber, and a free end portion located on the opposite side of the joining portion and provided with an elastic member,
The end portion in the product longitudinal direction of the free end portion is joined to the top sheet,
The disposable diaper according to any one of claims 1 to 4, wherein the joint portion is disposed between the crotch stretchable portion and the leg stretchable portion in the product width direction.   The disposable diaper according to any one of claims 1 to 4, wherein an expansion / contraction ratio of each crotch expansion / contraction part is 1.2 times or more and 1.8 times or less.   The disposable amount according to any one of claims 1 to 4, wherein a shrinkage amount of each of the crotch stretchable parts in the product longitudinal direction is 2% or more and 8% or less of a length of the disposable diaper in the product longitudinal direction. Diapers. Fastening tape extending in the product width direction in the rear waistline region,
A target portion that is disposed on the non-skin contact surface of the front waistline region and to which the fastening tape is fastened;
With
The waistline holding portion in the rear waistline region is a range extending in the product width direction from a region where an engagement member of the fastening tape is provided.
The waistline holding portion in the front waistline region is a range extending in the product width direction from a region where the target portion is provided,
5. The center according to claim 1, wherein a center of the crotch stretchable part in the product longitudinal direction is disposed closer to the front waistline region than a center of the disposable diaper in the product longitudinal direction. Disposable diapers. The crotch stretchable part is formed across the virtual product center line extending along the product width direction through the center of the disposable diaper in the product longitudinal direction in the extended state of the disposable diaper, and In the natural state of the disposable diaper, the front end of the front waistline region and the rear end of the rear waistline region are aligned with each other in a crotch region and a double fold line extending along the product width direction. ,
When the disposable diaper is in an extended state, a virtual crotch center line that passes through the center of the crotch stretchable part in the product longitudinal direction and extends along the product width direction is provided in front of the virtual product center line. The disposable diaper according to any one of claims 1 to 4, wherein the two-fold line is provided on the rear side of the virtual product center line in the product longitudinal direction. The front waistline side end of the range that can be expanded and contracted in the leg stretchable part is closer to the front waistline side of the disposable diaper than the end of the front waistline side of the range that can be expanded and contracted in the crotch stretchable part. Is configured to be close to the end of the
The rear waistline side end of the range that can be expanded and contracted in the leg stretchable part is closer to the back waistline side of the disposable diaper than the end on the back waistline side of the range that can be stretched in the crotch stretchable part Is configured to be close to the end of the
The disposable diaper in any one of Claims 1-4 comprised so that the tension coefficient of the said crotch expansion-contraction part may become larger than the tension coefficient of the said leg expansion-contraction part.

Images