JP5797295B1 - Disposable diapers - Google Patents

Abstract

Disclosed is a disposable diaper capable of maintaining comfort after excretion while ensuring absorption performance after excretion. A crotch expansion / contraction part 130 that expands / contracts in the product longitudinal direction is disposed on the inner side in the product width direction than the leg expansion / contraction part 75 of the disposable diaper. The absorbent core 40a includes a narrow portion 41 having the shortest length in the product width direction of the absorbent core, and a wide portion 42 positioned on the outer side in the product width direction than the narrow portion. The crotch stretchable part and the narrow part are located on the inner side in the product longitudinal direction than the waistline holding part. At least a part of the crotch stretchable part is located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction. [Selection] Figure 1

Description

  The present invention relates to a disposable diaper having a crotch stretchable part disposed on the inner side in the product width direction than the leg-surrounding stretchable part.

  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 disposed along an opening around a leg so that a compression mark by the elastic member is less likely to be attached to the wearer's body (for example, see Patent Document 1).

  In the disposable diaper of Patent Literature 1, an elastic member disposed along the leg opening and another elastic member are disposed along the waist opening. Therefore, the disposable diaper of patent document 1 can clamp the periphery of a leg periphery opening part, and the periphery of a trunk periphery opening part. With such a structure, even if the disposable diaper absorbs excrement or the wearer moves violently, the disposable diaper can be prevented from sagging.

  Patent Document 2 discloses a disposable diaper in which an elastic member that expands and contracts in the front-rear direction is disposed in a region that overlaps the absorber. The said elastic member is arrange | positioned ranging over the crotch part arrange | positioned at a wearer's crotch, and the trunk periphery part arrange | positioned around a wearer's trunk | drum. Moreover, the disposable diaper of patent document 2 has joined the outer edge of the waist part of the front side, and the outer edge of the waist part of the rear side.

JP 2001-37807 A International Publication No. 2006/118214

However, the conventional disposable diaper described above has the following problems.
The disposable diaper of patent document 1 is a structure which mainly clamps the periphery of a leg periphery opening part, and the periphery of a trunk periphery opening part. However, when the body fluid discharged from the wearer is absorbed by the absorbent body, the absorbent body is pulled down by the weight of the body fluid. Therefore, it may move away from the absorbent body from the wearer's crotch and the absorption performance may deteriorate.

  In the disposable diaper of Patent Document 2, since the outer edge of the front waistline portion and the outer edge of the rear waistline portion are joined, the entire waistline portion is in close contact with the wearer's body. Moreover, as for the disposable diaper of patent document 2, an absorber is pushed up to a wearer side by shrinkage | contraction of an elastic member. This elastic member straddles the crotch portion and the waist portion. Therefore, an absorber adheres not only to a wearer's inseam but also to a wearer's torso. In particular, after excretion, if the absorbent body that has absorbed bodily fluid adheres closely to the wearer's crotch and torso, there is a risk of discomfort due to stuffiness.

  Then, this invention is made | formed in view of such a condition, and it aims at provision of the disposable diaper which can maintain the comfort after excretion, ensuring the absorption performance after excretion.

  The disposable diaper according to the present disclosure is located between a front waistline area (front waistline area 20), a back waistline area (rear waistline area 25), and the front waistline area and the back waistline area. An inseam area (inseam area 30), a product longitudinal direction (product longitudinal direction L) from the front waist area to the rear waist area, and a product width direction (product width direction W) orthogonal to the product longitudinal direction A pair of leg-hole openings (leg-hole openings 35), an absorbent core (absorbent core 40a) extending across at least one of the front waist area and the rear waist area, straddling the crotch area, A waistline holding portion that extends in the product width direction and holds the disposable diaper on the wearer's body in the front waistline region and the back waistline region, and a pair of legs around the leg periphery opening A disposable diaper having a stretchable part (a leg-surrounding stretchable part 75); A crotch stretchable part (crotch stretchable part 130) that expands and contracts in the product longitudinal direction is disposed inside the product width direction, and the absorbent core has the shortest width in the product width direction of the absorbent core. A narrow part (narrow part 41) and a wide part (wide part 42) located on the outer side in the product width direction than the narrow part, and the crotch stretch part and the narrow part are It is located inside the product longitudinal direction from the waistline holding part, and at least a part of the crotch stretchable part is located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction. Is the gist.

  ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which can maintain the comfort after excretion can be provided, ensuring the absorption performance after excretion.

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 sectional drawing which shows the mounting state of a disposable diaper in FIG. It is an expansion | deployment top view of the disposable diaper which concerns on a modification.

  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 the side elastic members of the leg-surrounding stretchable part 75, the crotch stretchable part 130, and the leg side stretchable part 80 until the top sheet 50 constituting the disposable diaper, the side flap 70 and the like are not formed. It is a figure of the expansion | extension state which expanded 71. FIG.

  The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a back waistline region 30. The front waistline region 20 is a portion in contact with the front waistline portion (abdomen portion) of the wearer. Further, the rear waist region 30 is a portion in contact with the rear waist 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 the outer edge of the disposable diaper, and is a portion that is disposed along the circumference of the wearer's leg when the disposable diaper is worn by the wearer. The outer edge is an outer end in the product width direction, and the inner edge is an inner end in the product width direction.

  In the present embodiment, a direction from the front waistline region 20 to the back 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 back 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 outer edges of the absorber 40. 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 waist area 30 and is fastened to the non-skin contact surface of the front waist area 20, thereby holding the disposable diaper 10 on the wearer's body. To do.

  The target portion 95 is disposed on the non-skin contact surface in the front waist area, and is configured so that the pair of fastening tapes 90 are fixed to each other.

  In the present embodiment, the front waistline region 20, the back 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 a 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. In addition, the trunk periphery holding | maintenance part in a pants type disposable diaper is an area | region extended in the product width direction from the part where the front waist area and the back waist area were joined.

  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 extension / contraction parts 75 that can extend and contract in the product longitudinal direction L.

  The leg-surrounding expansion / contraction part 75 only needs to be configured so that the leg-surrounding opening 35 can be expanded / contracted in the product longitudinal direction, and may be arranged along the leg-surrounding opening 35, or a part thereof It may be arranged in an inclined state with respect to the part 35, or may extend linearly along the product longitudinal direction. Further, the leg-surrounding stretchable portion 75 is a portion that substantially shrinks in the product longitudinal direction by a 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.

  Further, a pair of leg side stretchable parts 80 extending along the product longitudinal direction L are provided inside the pair of leg-around stretchable parts 75 (near the center in the product width direction W). The leg side stretchable part 80 is an upright stretchable gather that is provided on the inner edge of the side flap 70 in the product width direction and is arranged on the inner side in the product width direction than the leg-around stretchable part 75. The leg side stretchable part 80 is disposed on the inner side in the product width direction than the leg-around stretchable part 75. The leg-side stretchable part 80 can adopt a conventionally well-known configuration. Specifically, the leg-side stretchable part 80 may be composed of a sheet material different from the side flap 70.

  The side flap 70 is folded back to the top sheet side at the inner edge, and two layers are laminated. A side 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 flap 70 and the side elastic member 71 form a leg side stretchable part 80.

  The leg side stretchable part 80 includes a joining portion 81 to be joined to a back side member positioned on the non-skin contact surface side of the leg side stretchable part 80, such as the top sheet 50 or the back sheet 60a, and a side elastic member 71. And a contraction portion 84 that is not joined to the back surface side member and contracts in the product longitudinal direction by the side elastic member 71. The joint portion 81 includes a first joint portion 81A located on the outer side in the product width direction from the contraction portion 84, and a second joint portion 81B located on the outer side in the product longitudinal direction from the contraction portion 84.

  The back side member may be a member located on the non-skin contact surface side with respect to the leg side stretchable part 80, and examples thereof include the top sheet 50, the back sheet 60a, and the exterior sheet 60. The leg side stretchable part 80 rises with the joint part 81 as the base end part when worn, and the contraction part 84 contacts the wearer's skin with the apex part. 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 side elastic member 71, and is a concept excluding a portion where the side elastic member 71 is disposed in a state where the contraction force is not exerted. Further, in FIG. 1, in the leg side stretchable portion, 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 on the outer side in the product width direction with respect to the contraction portion 84, and the second joint portion 81B is disposed on the outer side in the product longitudinal direction with respect to the contraction portion 84. ing. Therefore, the leg side stretchable part 80 is configured such that the center part in the product longitudinal direction including the crotch region 25 stands on the wearer side.

  Of the joint portions 81 of the leg side stretchable portion 80, the first joint portion 81A disposed on the outer side in the product width direction than the contracted portion 84 is, in the product width direction W, the narrow portion 41 and the leg-hole stretchable portion 75. It is arranged between. The first joining portion 81A is joined to the back sheet 60a (and part of the exterior sheet 60) in 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 joint portion 81 of the leg side stretchable portion 80, the second joint portion 81B disposed on the outer side in the product longitudinal direction from the contraction portion 84 is joined to the top sheet 50.

  Note that various configurations can be employed for the joint portion 81 of the leg side stretchable portion 80. The joint portion may be, for example, a portion that extends from the crotch portion to the front waistline region and the back waistline region in the product longitudinal direction and is joined to the top sheet, or the liquid portion outside the absorbent core 40a in the width direction. It may be a part joined to an impermeable back sheet or an exterior sheet, and is configured to be a standing base end part.

  Moreover, the leg side elastic part should just be an upright gathering arrange | positioned inside a product width direction rather than the leg circumference elastic part, and is not limited to the said structure, The structure of a conventionally well-known leg side elastic part is employ | adopted. Of course you can.

  Further, between the pair of fastening tapes in the product width direction, there is provided a waist elastic unit 85 that can be expanded and contracted in the product width direction. 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 member constituting the waist elastic part 85 is 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 entering rate. By configuring the waist stretchable portion 85 with a material having low bending rigidity, the waist stretchable portion 85 is easily bent along the body, and the waist stretchable portion 85 is moved along the body without applying a load to the wearer's body. Can be fitted. In addition, by configuring the waist elastic part 85 with a material with 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 around the waist of the wearer Can be prevented from being pulled down to the crotch side.

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

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

  In the present embodiment, the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist elastic part 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 elastic part according to the present embodiment is configured to expand and contract in the product width direction, but the waist elastic part may be configured to expand and contract in the product width direction and the product longitudinal direction. Good.

  The absorbent core 40a of the absorbent body 40 includes a narrow portion 41 having the shortest length in the product width direction of the absorbent core, and a wide portion 42 positioned on the outer side in the product width direction than the narrow portion 41. The wide portion 42 of the absorbent core 40a is provided in a region extending from the front end edge of the absorbent core 40a to the rear side and a region extending from the rear end edge of the absorbent core 40a to the front side. The narrow portion 41 is disposed between the wide portions 42 disposed in the front-rear direction. The length of the wide portion 42 in the product width direction is gradually shortened from the outer end edge of the wide portion 42 in the product longitudinal direction toward the inner end edge of the wide portion (the outer end edge of the narrow portion). The shape of the absorbent core 40a in plan view is an hourglass shape. The shape of the absorber 40 including the core wrap 40b as well as the absorbent core 40a may be an hourglass shape. The outer end edge is an outer end in the product longitudinal direction, and the inner end edge is an inner end in the product longitudinal direction.

  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 center in the product width direction of the rear end edge of the absorber 40 toward the front waistline region. 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 rear edge.

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

  By forming such a notch 110, the expansion and contraction of the waist elastic part 85 is not hindered, 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 elastic part 85 in consideration of prevention of excrement leakage.

  Further, when the absorbent body 40 is contracted in the product width direction W by the waist elastic part 85 and the interval between the absorbent bodies on both sides in the product width direction becomes narrower than the notch 110, the rear waist area 30 of the notch 110 Because the part near the end on the side is closer to the center of the product width direction W than the part near the crotch area 25, the contraction in the product width direction W occurs at the part around the back waist area 30 and the part near the crotch area 25. A difference in amount occurs, and the rear waist area 30 rises.

  That is, since it has the waist elastic part 85 and the wedge-shaped notch 110 that can be expanded and contracted in the product width direction W, when the disposable diaper 10 is mounted, a cup shape in which the disposable diaper 10 swells easily on the non-skin surface side is easily formed.

  Further, in this 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. The cup shape can be formed more stably because the rise of the rear waistline region 30 is made more conspicuous in the product width direction W center.

  In the present embodiment, since the waist elastic part 85 exists beyond the outer edge of the absorbent core 40a, the rear end edge side portion of the absorbent core 40a is worn by the wearer while forming the disposable diaper 10 in a cup shape. Can follow the body positively. Furthermore, at least a part of the waist elastic part 85 and the notch 110 exists 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 placed underneath, the waist elastic part 85 that extends beyond the outer edge of the absorbent core 40a is below the wearer's body. Not laid. Therefore, by pulling the fastening tape 90, the outer edge of the waist elastic part 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 than the notch 110 has a convex shape toward the rear waistline region. For this reason, in addition to facilitating the formation of a cup shape in which the disposable diaper 10 swells on the non-skin surface side as described above, the surface area of the absorbent core 40a is maintained, and therefore, from the rear edge of the absorbent core 40a Leakage of excrement can be prevented.

  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 rear edge, and the rise of the rear waist area 30 becomes more prominent, so the cup shape is formed more stably. Easy to do. Further, since the boundary between the absorbent core 40a and the notch 110 is an arc that protrudes toward the inseam area 25, the rear waist area 30 becomes a round cup shape due to the shrinkage of the notch 110, and is worn The shape is easy to follow along the person's rounded buttocks.

  Further, since the notch 110 is formed, the rear end edge of the absorber 40 is formed with a convex shape toward the rear periphery 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.

  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.

  Even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waistline region 20 and the back waistline region 30 and the absorbent core 40a located in the crotch region 25 are completely It is preferable that it is continuous in the width direction without being separated.

  In addition, an 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) rather than the edge. With such a shape, deformation along the roundness of the wearer's body is easier and more likely to occur.

  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 of the nonwoven fabric constituting the base sheet 91 (total basis weight in the case of a plurality of sheets) is 30 to 120 g / m ² , preferably 40 to 90 g / m ² .

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

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

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

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

  The leg circumference stretchable part 75 is arranged along the leg circumference opening 35 provided outside the absorbent body 40 in the product width direction, and is configured to be stretchable in the product longitudinal direction L. The leg opening 35 and the leg elastic part 75 have a width direction inner end region 75I in which the position in the width direction is located on the innermost side in the crotch region. The leg opening 35 and the leg elastic part 75 extend toward the product width direction outer side from the crotch region 25 toward the product longitudinal direction outer side, particularly in the rear waist area. In addition, the width direction inner end region 75I of the leg-circular stretchable part 75 may be continuously arranged in the product longitudinal direction or may not be continuous in the product longitudinal direction. In the present embodiment, the region in which the position in the width direction of the leg periphery opening 35 is located on the innermost side in the crotch region coincides with the width direction inner end region 75I of the leg periphery expansion / contraction part 75, but does not necessarily match. It does not have to be.

  The leg-hole stretchable part 75 of the present embodiment is configured by a stretchable 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-hole stretchable portion 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-circular stretchable part 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in the region where the back sheet 60a disposed between the absorbent body 40 and the exterior sheet 60 is provided, the leg-hole stretchable part 75 is disposed between the back sheet 60a and the side flap 70.

  The elastic sheet constituting the leg elastic part 75 is at least in the crotch region 25 and has a width of 5 mm (width in the product width direction W in the natural state of the disposable diaper 10) or more and 45 mm or less, more preferably 12.5 mm or more and 35 mm or less. Preferably there is. If it is less than 5mm, the effect of lowering the load on the skin due to the elastic element does not appear because the force to tighten partially does not concentrate by following the circumference of the wearer's leg substantially on the surface, and if it exceeds 45mm 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-surrounding stretchable part 75 is preferably 1.6 to 2.3 times. In the present embodiment, the expansion ratio of the leg-hole stretchable part 75 is set to 1.8 to 2.0 times. The extension rate means the degree of extension of the leg-surrounding extension and is defined as follows.
Elongation rate = (length of stretchable part around leg in stretched state) ÷ (length of stretchable part around leg 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 the leg periphery expansion-contraction part is cut out. At this time, it cuts out also including the exterior sheet | seat joined to a leg periphery expansion-contraction part. The elongation rate of the sample around the leg stretchable part after the cut 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 stretchable part around the leg is measured along the stretch direction. This length is referred to as “the length of the elastic part around the leg 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-surrounding stretchable part in the extended state”.
Using these measurement results, the elongation percentage is measured by calculating with the above formula.

  In addition, the distance between the inner ends of the pair of left and right leg elastic parts 75 in the product width direction W increases from the crotch area 25 to the front waist area 20, and from the crotch area 25 to the rear waist area 30. It gets wider as you go. When wearing a diaper on the wearer's body, placing the leg stretchable part in a shape that narrows at the crotch and widens around the front and back torso, so that the leg stretchable part can follow the body line more It becomes possible, and a leg periphery expansion-contraction part will be suitably elongately arranged around a wearer's leg.

  Furthermore, the interval (D1 in the drawing) at the front end edge of the pair of left and right leg-hole stretchable portions 75 is narrower than the gap (D2 in the drawing) at the rear end edge of the pair of left and right leg-hole stretchable portions 75. In addition, the interval is the inside 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 from a natural state to a state without wrinkles. The distance between the edges 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-circular 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-around elastic part 75 on the buttock side can be stretched while being in close contact, and even if the amount of change in elongation is large The leg elastic part 75 does not stretch. Accordingly, the displacement of the disposable diaper 10 due to the leg-circular stretchable 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. The leg opening and the leg elastic part 75 have a shape extending from the crotch region toward the outer side in the longitudinal direction toward the outer side in the width direction. 75 can be disposed and local stress concentration can be suppressed, so that it can be in close contact with the wearer at a relatively low elongation rate, and the burden on the skin can be reduced.

  The leg-circular stretchable part 75 is configured to bend and contract the disposable diaper along the circumference of the wearer's leg. The outer end edge (the outer end in the longitudinal direction) of the leg-circular stretchable part 75 is disposed so as to extend in the width direction, and is disposed in the vicinity of the waistline holding part. Therefore, the outer end edge (outer end in the product longitudinal direction) of the leg-circular stretchable part 75 acts so as to contract in the width direction together with the waistline holding part.

  The crotch stretchable part 130 is disposed on the outer side in the product width direction than the absorbent core 40a and on the inner side in the product width direction than the leg-around stretchable part 75. The crotch stretchable part 130 includes a first crotch stretchable part 131 and a second crotch stretchable part 132 positioned on the outer side in the product width direction than the first crotch stretchable part 131 on the left and right sides. The 1st crotch elastic part 131 and the 2nd crotch elastic part 132 are arrange | positioned so that it may not overlap with an absorptive core in the thickness direction of a disposable diaper. The crotch stretchable part 130 is composed of a plurality of thread-like elastic members. The crotch elastic part 130 is disposed between the top sheet 50 and the back sheet 60a. Note that the crotch stretchable portion 130 may be disposed between the exterior sheet 60 and the backsheet 60a.

  The length of the second fork stretchable part 132 in the product longitudinal direction is longer than the length of the first fork stretchable part 131 in the product longitudinal direction. As a modification, the length of the second fork stretchable part 132 in the product longitudinal direction and the length of the first fork stretchable part 131 in the product longitudinal direction may be the same length. Further, the length of the crotch stretchable portion 130 in the product longitudinal direction is shorter than the length of the leg-around stretchable portion 75 in the product longitudinal direction.

  In the present embodiment, the configuration in which the lengths of the stretchable portions such as the crotch stretchable portion 130 and the leg-surrounding stretchable portion 75 are the same is the effective length (other members constituting the stretchable portion and the disposable diaper are adhesives. The difference between the lengths of the parts bonded together is within 10%.

  The crotch stretchable part 130 is arranged to be biased toward the front waist region in the product longitudinal direction. In other words, the product longitudinal direction center of the crotch stretchable part 130 is located in front of the product longitudinal direction center of the disposable diaper.

  At least a part of the crotch stretchable part 130 is located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction in the extended state of the disposable diaper. The at least part of the crotch stretchable part 130 means one of the first crotch stretchable part 131 and the second crotch stretchable part 132 or a part of the first crotch stretchable part 131 (second crotch stretchable part 132). .

  Therefore, in the present embodiment, both the first crotch elastic part 131 and the second crotch elastic part 132 are located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction. The disposable diaper which concerns on this invention is not restricted to the said structure. It suffices that at least one of the first crotch elastic part 131 and the second crotch elastic part 132 is located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction. Alternatively, a part of the first crotch stretch part 131 or a part of the second crotch stretch part 132 may be partially located between the side edge of the wide part and the side edge of the narrow part.

  The 1st crotch elastic part 131 is arrange | positioned along the narrow part of an absorptive core. The first crotch stretchable part is located on the inner side in the product width direction than the line FL1 that passes through the center of the wide part in the product width direction and extends in the product longitudinal direction. The center in the product width direction of the wide portion is the center between the outer edge of the wide portion and the outer edge of the wide portion.

  The expansion ratio of the crotch stretchable part 130 is preferably 1.2 to 2.5 times. In this embodiment, the expansion rate of the crotch stretchable part 130 is set to 1.3 to 1.9 times. The elongation rate means the degree of elongation of the crotch stretchable portion 130, and can be defined in the same manner as the stretch rate of the leg-around stretchable portion. When the expansion rate of the crotch stretchable part 130 is higher than 2.5 times, the crotch stretchable part contracts too much, and the absorbent core is separated from the body at the crotch part. On the other hand, if the expansion rate of the crotch stretchable part 130 is lower than 1.2 times, the absorbent core cannot be lifted so as to approach the body.

  Subsequently, the wearing state of the disposable diaper comprised in this way is demonstrated. FIG. 4 is a cross-sectional view of the disposable diaper in a worn state. The cross-sectional view shown in FIG. 4 shows a mounting state in a cross-section based on the F1-F1 line shown in FIG.

  In general, the crotch region 25 of the disposable diaper 10 hangs downward when worn and easily separates from the wearer's body. However, as shown in FIG. 4, the disposable diaper 10 according to the present embodiment can pull up the absorbent core 40 a toward the wearer's crotch side by contraction of the crotch stretchable part 130. Therefore, it can suppress that a disposable diaper and a wearer's body leave | separate. Since the absorbent core 40a can continue to be pulled up to the inseam of the wearer by the crotch stretchable part 130, the absorbent core 40a is separated from the wearer even when the weight of the body fluid is applied to the absorbent core 40a. This can be suppressed. Therefore, absorption performance can be secured even after excretion.

  Moreover, a waist circumference holding | maintenance part is a part which hold | maintains a disposable diaper around a wearer's waist, and closely_contact | adheres to a wearer's body. When the waistline holding part and the crotch stretchable part 130 overlap, the absorbent core 40a not only to the wearer's inseam but also to the wearer's waistline by the shrinkage of the crotch stretchable part 130 and the waistline holding part. Is in close contact. Therefore, after excretion, the absorbent core 40a that has absorbed bodily fluids may come into close contact with the wearer's crotch and around the waist, which may cause discomfort due to stuffiness.

  However, since the crotch stretchable part 130 is located on the inner side in the product longitudinal direction of the waistline holding part in the extended state of the disposable diaper, the waistline holding part and the crotch stretchable part 130 can function separately. That is, the disposable diaper can be brought into close contact with the wearer's torso by the torso holding part, and the absorbent core in the inseam area can be pulled up to the inseam of the wearer by the crotch stretchable part 130. Therefore, the comfort after excretion can be maintained while ensuring the absorption performance after excretion.

  Further, since the notches 115 and 125 are arranged in the region extending in the product width direction from the crotch stretchable portion 130, the pulling effect by the crotch stretchable portion 130 is further exhibited. Further, the absorbent core is partially bent by the crotch stretchable part 130 in a state where the disposable diaper is attached to the wearer. Since the absorptive core is formed, the way of bending of the absorptive core becomes smooth, and the uncomfortable feeling at the time of wearing can be reduced.

  In the extended state of the disposable diaper, the crotch stretchable part 130 is located on the inner side in the product width direction with respect to a line passing through the center of the wide part in the product width direction and extending in the product longitudinal direction. The region inside the product width direction from the line passing through the center in the product width direction of the wide portion and extending in the product longitudinal direction is a portion where the width of the absorbent core is relatively short and is a portion applied to the inseam of the wearer is there. By disposing the crotch stretchable part 130 in the part, the absorbent core in the part that hits the wearer's crotch can be raised.

  In the extended state of the disposable diaper, the length of the crotch stretchable portion in the product longitudinal direction is shorter than the length of the leg stretchable portion in the product longitudinal direction. The leg-surrounding stretchable part 75 is arranged so as to cover the circumference around the wearer's leg, and the disposable diaper is arranged along the entire circumference of the wearer's leg. On the other hand, the crotch elastic part 130 arrange | positions only a part arrange | positioned to a wearer's crotch among an absorptive core so that a wearer's body may be followed. For example, when the length of the product in the longitudinal direction of the crotch stretchable part 130 is the same as the length of the product around the leg stretchable part 75 in the product longitudinal direction, the entire absorbent core is in close contact with the wearer's body, There is a risk of discomfort. However, since the product length of the crotch stretchable part 130 is shorter than the product length of the leg stretchable part, only the necessary part of the absorbent core can be placed along the wearer's body, Etc. can be suppressed.

  The first crotch stretchable part passes through the center in the product width direction and is located on the inner side in the product width direction than the line extending in the product longitudinal direction, and the second crotch stretchable part passes through the center in the product width direction of the wide part and It is located on the inner side in the product width direction than the line extending in the product longitudinal direction. In the extended state of the disposable diaper, the length of the second fork stretchable part 132 in the product longitudinal direction is longer than the length of the first fork stretchable part 131 in the product longitudinal direction. The side edge portion of the absorber is positioned on the outer side in the product longitudinal direction as it goes outward in the width direction. According to the said structure, the change of the shape of the side edge part of this absorber and the change of the length of the longitudinal direction of a crotch expansion-contraction part correspond, and the effect which lifts an absorptive core becomes remarkable.

  In the extended state of the disposable diaper, the crotch stretchable part 130 is arranged biased toward the front waist region in the product longitudinal direction. In general, an infant's body is in a state where the buttocks protrude more than the lower abdomen. Since the crotch stretchable part 130 is biased toward the front waistline region, the part pulled up to the wearer by the crotch stretchable part 130 can be matched with the wearer's crotch. Therefore, a disposable diaper can be arrange | positioned with good balance according to a wearer's body.

  In the extended state of the disposable diaper, the crotch stretchable part 130 does not overlap the absorbent core in the thickness direction of the disposable diaper. For example, when the crotch stretchable portion 130 and the absorbent core overlap, the front and back absorbent cores having higher rigidity than the nonwoven fabric approach each other. Therefore, the absorbent core may be closed in the crotch region, and the absorbent core may not be deformed so as to approach the body, and the absorbent core may protrude. However, by disposing the crotch stretchable portion 130 and the absorbent core so as not to overlap, the absorbent core becomes difficult to bend excessively. Therefore, it is easy to realize a state in which the absorbent core is lifted to the body side and approaches the absorbent core.

  Subsequently, the disposable diaper which concerns on a modification is demonstrated based on FIG. In the description of the modification, the same reference numerals are used for the same configurations as those in the embodiment, and the description is omitted. FIG. 5 is a developed plan view of a disposable diaper according to a modification. Three crotch stretchable portions 130 of the disposable diaper 10A according to the modification are arranged on each of the left and right sides.

  The first crotch stretch part 131 located on the outer side of the absorbent core in the product width direction, the second crotch stretch part 132 located on the outer side in the product width direction than the first crotch stretch part 131, and the first crotch stretch part 131 A third crotch stretchable part 133 located on the inner side in the product width direction.

  The first crotch stretch part 131 and the second crotch stretch part 132 do not overlap the absorbent core in the thickness direction of the disposable diaper. On the other hand, the 3rd crotch elastic part 133 has overlapped with the absorptive core in the thickness direction of a disposable diaper.

  The length in the product longitudinal direction of the first fork stretchable part 131, the length in the product longitudinal direction for the second fork stretchable part 132, and the length in the product longitudinal direction for the third fork stretchable part 133 are the same length.

  Of the plurality of crotch stretchable parts, the third crotch stretchable part 133 is configured to overlap the absorbent core in the thickness direction of the disposable diaper. According to the said structure, an absorptive core can be pulled up more effectively by the 3rd crotch elastic part 133 which overlaps with an absorptive core.

  It goes without saying that the present invention includes various embodiments 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.

20: Front waist area
25: Inseam area
30: Rear waist area
35: Leg opening
40: Absorber
40a: Absorbent core
40b: Core wrap
41: Narrow part
42: Wide part
50: Top sheet
60: exterior sheet
60a: Back sheet
70: Side flap
71: Side elastic member
75: Leg extension / contraction
75I: Inner edge area in the width direction
80: Leg side stretchable part
81: Joint part
81A: First joint
81B: Second joint part
84: Contraction
85: waist elastic
90: Fastening tape
91: Base sheet
92: Hook sheet
95: Target section
110: Notch
130: Crotch stretch
131: 1st crotch elastic part
132: 2nd crotch elastic part
133: 3rd crotch elastic part
L: Product longitudinal direction
W: Product width direction

Claims (6)

A front waistline region, a back waistline region, a crotch region located between the front waistline region and the back waistline region;
The product longitudinal direction from the front waist area to the rear waist area,
Product width direction orthogonal to the product longitudinal direction;
A pair of leg openings,
An absorbent core that straddles the crotch region and extends to at least one of the front waistline region and the back waistline region;
In the front waistline region and the back waistline region, a waistline holding portion that extends in the product width direction and holds the disposable diaper on the wearer's body;
A disposable diaper having a pair of leg elastic parts arranged along the leg circumference opening,
A crotch expansion / contraction part that expands / contracts in the product longitudinal direction is arranged on the inner side in the product width direction than the leg extension / contraction part,
The absorbent core has a narrow portion where the length of the absorbent core in the product width direction is the shortest, and a wide portion located on the outer side in the product width direction than the narrow portion,
The crotch stretchable part and the narrow part are located on the inner side in the product longitudinal direction than the waistline holding part,
At least a portion of said crotch elastic portion, in the product width direction is located between the outer edge of the outer edge and the narrow part of the wide portion,
The crotch stretchable part has a first crotch stretchable part and a second crotch stretchable part located on the outer side in the product width direction than the first crotch stretchable part,
The first crotch stretchable part is located on the inner side in the product width direction than a line that passes through the center of the wide part in the product width direction and extends in the product longitudinal direction,
The second crotch stretchable part is located on the inner side in the product width direction with respect to a line passing through the center of the wide part in the product width direction and extending in the product longitudinal direction,
The disposable diaper in which the length of the product longitudinal direction of the second crotch stretchable part is longer than the length of the first crotch stretchable part of the product longitudinal direction . A front waistline region, a back waistline region, a crotch region located between the front waistline region and the back waistline region;
The product longitudinal direction from the front waist area to the rear waist area,
Product width direction orthogonal to the product longitudinal direction;
A pair of leg openings,
An absorbent core that straddles the crotch region and extends to at least one of the front waistline region and the back waistline region;
In the front waistline region and the back waistline region, a waistline holding portion that extends in the product width direction and holds the disposable diaper on the wearer's body;
A disposable diaper having a pair of leg elastic parts arranged along the leg circumference opening,
A crotch expansion / contraction part that expands / contracts in the product longitudinal direction is arranged on the inner side in the product width direction than the leg extension / contraction part,
The absorbent core has a narrow portion where the length of the absorbent core in the product width direction is the shortest, and a wide portion located on the outer side in the product width direction than the narrow portion,
The crotch stretchable part and the narrow part are located on the inner side in the product longitudinal direction than the waistline holding part,
At least a part of the crotch stretchable part is located between the outer edge of the wide part and the outer edge of the narrow part in the product width direction,
The crotch stretchable part is a disposable diaper arranged in a biased manner toward the front waist region in the product longitudinal direction. The disposable diaper according to claim 2 , wherein the crotch stretchable part is located on the inner side in the product width direction with respect to a line passing through a center of the wide part in the product width direction and extending in the product longitudinal direction. Wherein said product longitudinal length of the crotch elastic portion, said shorter than the product longitudinal length of the leg-surrounding stretchable portion, the disposable diaper according to any one of claims 1 to 3. The disposable diaper according to any one of claims 1 to 4 , wherein the crotch stretchable portion does not overlap the absorbent core in the thickness direction of the disposable diaper. A plurality of the crotch stretchable parts are provided,
Some crotch stretchable parts of the plurality of crotch stretchable parts overlap the absorbent core in the thickness direction of the disposable diaper, and other crotch stretchable parts of the plurality of crotch stretchable parts in the thickness direction of the disposable diaper The disposable diaper in any one of Claims 1-4 which does not overlap with the said absorptive core.

Images