JP6181407B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper.

  Conventionally, a disposable diaper having a front waistline region, a rear waistline region, and a crotch region, having a pair of leg hole openings and straddling the crotch region, and having an absorbent body extending to the front waistline region and the rear waistline region Are known.

  In general, the navel part of an infant (particularly, a newborn) is in a wound-like state because the skin surface is not dry. There was concern that the baby could hurt the baby's navel or hurt the baby.

  Therefore, in such a disposable diaper, in order to protect such a delicate baby's navel, in the front waist area of the disposable diaper, a U-shaped or V-shaped projecting toward the center in the product width direction of the disposable diaper A structure for forming a notch having a shape is known (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 1-162806 Japanese Patent Laid-Open No. 62-199802

  In general, when an infant has an abdomen around and the front end of the disposable diaper is located on the belly bulge, the belly bulge may not be properly covered by the disposable diaper. In order to properly cover the bulge of the stomach while protecting the wearer's navel, in the disposable diaper with fastening tape, the fastening position of the fastening tape is stopped on the crotch side and in the width direction, and the front waistline area is raised. It can be considered to be mounted while being pulled outward in the width direction.

  When worn with the front waist area pulled up and pulled outward in the width direction, the front waist area of the disposable diaper has a notch that extends outward in the width direction, protecting the wearer's navel and It is arranged along the bulge. However, since the rear waistline area of the disposable diaper is pulled toward the front waistline area, the rear waistline is stretched against the body, and the wearing feeling may deteriorate.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the disposable diaper which can cover the swelling of a wearer's belly appropriately, protecting a wearer's navel. To do.

  The disposable diaper (disposable diaper 10) according to the present disclosure is located between a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and the front waistline region and the rear waistline region. Inseam area (inseam area 25), product longitudinal direction from the front waistline area to the rear waistline area (product longitudinal direction L), product width direction orthogonal to the product longitudinal direction (product width direction W), and An absorbent body that straddles the crotch region and extends in at least one of the front waistline region and the rear waistline region, and extends in the product width direction in the front waistline region and the rear waistline region, and disposes the disposable diaper on the wearer's body. A disposable diaper comprising: a waistline holding portion to hold; and a pair of fastening tapes (fastening tape 90) that extend outward from the rear waistline region in the product width direction and fasten to the front waistline region, In the region A front notch (front notch 31) is formed in a region including the center in the product width direction and including the end in the product longitudinal direction, and the product width direction in the rear waistline region is formed. A rear notch (rear notch 32) is formed in an area including the end in the product longitudinal direction at the center, and the rear notch is on the outer side in the product longitudinal direction than the waistline holding portion. The gist of the present invention is that it is provided apart from the waistline holding portion.

  It is possible to provide a disposable diaper that can appropriately cover the wearer's belly bulge while protecting the wearer's navel.

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 enlarged view of the product longitudinal direction outer side edge part of the disposable diaper in the expansion | deployment top view shown in FIG. (A) has shown the rear side edge part of the disposable diaper, (b) has shown the front side edge part of the disposable diaper. It is the figure which showed typically the wearing state of a disposable diaper. It is the figure which showed typically the deformation | transformation state of the rear notch part. (A) has shown the state before a deformation | transformation, (b) has shown the state after a deformation | transformation.

  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, air-through nonwoven fabric of weight approximately 10 to 30 g / m ^2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet mass about 10 to 30 g / m ^2,.

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

  Side flaps 70 are respectively provided on the side edges of the absorbent body 40 in the product width direction W. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets. The pair of side flaps 70 are each provided with a fastening tape 90.

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

  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. In FIG. 1, the waistline holding portion is indicated by hatching.

  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.

  The disposable diaper is formed with a front notch 31 and a rear notch 32. The front notch 31 protrudes from the front end portion 10F of the disposable diaper toward the rear waist. The front notch 31 is formed in a region including the center in the product width direction and the end of the disposable diaper in the product longitudinal direction within the front waistline region. Since the front notch 31 is formed across the center of the disposable diaper in the product width direction, the wearing assistant grasps the center in the width direction of the front waistline using the front notch 31 as a mark. be able to. Therefore, the front waist area can be correctly applied to the wearer's abdomen when the disposable diaper is worn.

  The rear notch 32 is formed in the rear waistline region in a region including the center of the disposable diaper in the product width direction and including the end of the disposable product in the longitudinal direction. The rear notch 32 projects from the rear end 10R of the disposable diaper toward the front waist. Since the rear notch 32 is formed across the center in the product width direction of the disposable diaper, the wearing assistant grasps the center in the width direction of the rear waist area using the rear notch 32 as a mark. be able to. Therefore, when deploying a disposable diaper and putting a wearer on it, a wearer's buttocks can be easily arranged at a correct position. The notch will be described 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 can be moved along the body without applying a load to the wearer's body. Can be fitted. In addition, by configuring the waist stretchable portion 85 with a material having a small width, the shrinkage 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 waist of the wearer. Can be prevented from being pulled down to the crotch side.

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

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

  In the present embodiment, the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist stretchable portion 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. It may be. The position of the waist elastic part is not particularly limited. 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 85 is arranged in the crotch region side of the rear notch 32 in the rear waist region. The rear end of the waist extension / contraction part 85 is located on the front side of the rear notch 32, and the front end of the waist extension / contraction part 85 is arranged on the crotch region side than the rear end of the absorber. ing. Therefore, the waist stretchable portion 85 partially overlaps the absorber.

  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 low-rigidity portion 110 as a low-rigidity region that has a lower basis weight than other parts of the absorber or does not have the absorbent core 40a. The low-rigidity portion 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 low-rigidity portion 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 low-rigidity portion 110 has a trapezoidal shape that is convex toward the end on the rear waistline region side.

  A part of the low-rigidity part 110 is disposed so as to overlap with the waist elastic part 85 in a plan view of the disposable diaper. In this embodiment, the waist extension / contraction part 85 is arranged so as to overlap with a part of the low rigidity part 110, but all of the waist extension / contraction part 85 and the low rigidity part 110 may be arranged so as to overlap. Good.

  By forming such a low-rigidity part 110, the low-rigidity part 110 is narrowed, even if the waist-shrinking elastic part 85 contracts, without inhibiting the expansion and contraction of the waist elastic part 85. In addition, since the interval between the absorbent bodies on both sides in the product width direction is narrowed, the absorbent body 40 does not easily rise in an unintended shape. The low-rigidity part 110 is preferably narrower than the width of the waist elastic part 85 in consideration of prevention of excrement leakage.

  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 in the product width direction becomes narrower than the low rigidity portion 110, the rear waist area of the low rigidity portion 110 Since the part near the end on the 30 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 is caused between the part on the rear waistline 30 side and the part near the crotch area 25. A difference in amount occurs, and the rear waistline region 30 comes to stand.

  That is, since it has the waist stretchable portion 85 that can be stretched in the product width direction W and the wedge-shaped low-rigidity portion 110, a cup shape in which the disposable diaper 10 swells on the non-skin surface side is formed when the disposable diaper 10 is attached. easy.

  In the present embodiment, the low-rigidity part 110 does not have the absorbent core 40a, and the waist elastic part 85 exists so as to overlap the low-rigidity part 110, so the rear waistline region 30 in the product longitudinal direction L The part 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, so the cup shape is formed more stably. obtain.

  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 low rigidity part 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 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 than the low-rigidity portion 110 has a convex shape 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 this embodiment, the low-rigidity portion 110 has a wedge shape, and the boundary between the absorbent core 40a and the low-rigidity portion 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 in the product width direction W of the low-rigidity portion 110 increases nonlinearly as it goes to the end 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. Therefore, it is easy to form the cup shape more stably. Furthermore, since the boundary between the absorbent core 40a and the low-rigidity portion 110 is an arc that protrudes toward the crotch region 25, the rear waistline region 30 becomes a round cup shape due to the shrinkage of the low-rigidity portion 110, The shape is easy to follow along the rounded buttocks of the wearer.

  Further, since the low-rigidity portion 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. 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.

  Furthermore, since the low rigidity portion 110 is provided, the thickness of the absorber becomes thinner toward the rear end portion of the absorber. Therefore, the center of the product width direction at the rear end of the absorber becomes easier to follow along the body.

  Further, the absorber 40 in the front waistline region is provided with a low-rigidity portion 111 as a low-rigidity region that has a lower basis weight than other parts of the absorber or does not have the absorbent core 40a. The low-rigidity portion 111 has a shape in which the length in the product width direction gradually decreases from the product width direction center of the end portion of the absorber 40 on the front waistline region side toward the rear waistline region side.

  By providing the low rigidity portion 111, the thickness of the absorber becomes thinner toward the front end portion of the absorber. Therefore, in the state where the fastening tape 90 is fixed to the target portion 95, the center in the product width direction at the front end portion of the absorber becomes easier to follow.

  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 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 expansion / contraction part 75 of this Embodiment is comprised with 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 portion 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W.

  The crotch stretchable part 200 is provided separately from the leg stretchable part 75 and overlaps the absorbent core 40a (in this embodiment, between the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a). Position), 60% or more of the length in the 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.

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

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

  That is, the disposable diaper 10 can be stably mounted so that the crotch region 25 of the disposable diaper 10 is disposed in the crotch part of the wearer by 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. 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.

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

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

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

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

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

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

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

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

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

  Further, an absorber notch 115 (absorber notch 125) is formed in the crotch region 25 of the absorber 40. The absorber notch 115 and the absorber notch 125 are regions where the absorbent core 40a constituting the absorber 40 is not present. In the present embodiment, the absorbent body cutout 115 and the absorbent body cutout 125 correspond to a low-rigidity portion in which the basis weight of the absorbent core 40a is lower than other portions of the absorbent core 40a. Instead of forming the absorber notch 115 and the absorber notch 125, the area of the absorber notch 115 and the absorber notch 125 is different from that of the absorbent core 40a. You may make it make it lower than a part.

  The absorber notch 115 and the absorber notch 125 exist along the edge in the product longitudinal direction L of the crotch stretchable part 200. Even if the absorber cutout 115 and the absorber cutout 125 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 and the absorbent core 40a located in the crotch region 25 are It is preferable that it is continuous in the width direction without being completely separated.

  The absorber notch 115 and the absorber notch 125 increase in length 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 absorber notch 115 and the absorbent core 40a located closer to the rear waistline region 30 than the absorber notch 125 rise from the “bottom”. Since it becomes easy to curve along the roundness of the wearer's body (abdomen and buttocks), the shape of the disposable diaper itself can be closer to the shape of the wearer's body.

  Moreover, the edge part near the front waist area 20 (rear waist area 30) of the absorber notch 115 (absorber notch 125) has an arc shape. The edge of the absorber notch 115 (absorber 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.

  Subsequently, the wearing state of the disposable diaper comprised in this way is demonstrated. Drawing 4 is a figure showing typically the wearing state of a disposable diaper. When wearing, the fastening tape engaging member is fastened to the target portion, and the disposable diaper is held around the wearer's waist. At this time, the front notch part 31 formed in the front side edge part of a disposable diaper is arrange | positioned at a wearer's navel part. Therefore, it can suppress that a disposable diaper hits a wearer's navel part, and can suppress irritation | stimulation with respect to a navel.

  In general, when an infant has an abdomen around and the front end of the disposable diaper is located on the belly bulge, the belly bulge may not be properly covered by the disposable diaper. As shown in Fig. 4, the fastening position of the fastening tape is stopped on the crotch side and the inner side in the width direction, and the front taper area is pulled up and pulled out in the width direction to protect the wearer's navel. While properly covering the bulge of the stomach.

  Specifically, when worn while pulling up the front waist area and pulled outward in the width direction, the front waist area of the disposable diaper protects the wearer's navel by spreading the notch portion outward in the width direction. Can be placed along the bulge of the wearer's belly.

  On the other hand, the rear waist area of the disposable diaper is pulled toward the front waist area, so that it may be stretched against the body, and the wearing feeling may be deteriorated. Since the notch 32 is formed, when pulling the fastening tape of the rear waistline to the front waistline, it is held on the waist around the wearer's waist by the waistline holder, and the product longitudinally outside of the waistline holder The rear notch portion 32 located at the front is widened, and the rear waistline region can be drawn toward the front waistline region side. FIG. 6A shows the rear notch 32 before the disposable diaper is attached, and FIG. 6B shows the rear notch 32 after the disposable diaper is attached.

  Since the waistline holding part is a part that holds the disposable diaper on the wearer's body, for example, when the waistline holding part and the rear cutout part 32 overlap, the fastening tape is pulled outward in the product width direction at the time of wearing. At this time, the rear notch 32 may extend in the product width direction at the waistline holding portion, and the backside waistline holding portion may be difficult to be held by the wearer. However, since the waistline holding part and the rear cutout part 32 are separated from each other, in the state where the position of the waistline is maintained, only the area located on the outer side in the longitudinal direction is drawn toward the front waistline area side of the fastening tape. The fastening position can be attached to the crotch side and to the inner side in the width direction and pulled up in the width direction while pulling up the front waistline region. As a result, even an infant whose belly circumference protrudes can properly cover the bulge of the belly.

  A waistline elastic part 85 is provided between the rear cutout part 32 and the waistline holding part. Since the waist stretchable portion 85 is provided, when the fastening tape 90 is engaged with the target portion 95, the waistline holding portion is maintained at the waistline position of the wearer, and is positioned on the outer side in the longitudinal direction than that. The fit of the area to be worn is enhanced by the contraction of the waist elastic part 85, and it becomes easy to maintain the waist circumference position of the wearer. Further, after the fastening tape 90 is engaged with the target portion 95, the front waistline region side is easily pulled to the rear waistline position by the shrinkage of the waist stretchable portion 85.

  In addition, when the fastening tape is fastened to the crotch side and to the inner side in the width direction and the front waistline is pulled up and pulled out to the outer side in the width direction, the waist elastic part 85 is attached to the wearer's back. The front waistline region can be pulled toward the rear waistline side by the waist stretchable portion 85, and as a result, the front waistline region can be pulled up around the wearer's stomach.

  Further, the expansion / contraction rate of the waist elastic part 85 can be set as appropriate. By appropriately setting the expansion / contraction ratio of the waist extension / contraction part 85, the contraction state of the rear notch part 32 on the crotch region side changes. Therefore, the shape of the rear notch 32 is changed in the natural state of the diaper. This makes it possible to clarify the difference between the shape of the back notch 32 on the back side and the shape of the front notch 31 on the abdomen in the natural state of the diaper (when taken out of the package and unfolded). It becomes possible to recognize the front and back more easily.

  The product width direction length of the waist elastic part is longer than the product width direction length of the absorbent body. The region where the absorber is disposed has relatively high rigidity and is difficult to expand and contract. The length of the stretchable portion in the width direction is longer than the length of the absorbent body in the width direction, and the region extending outward in the width direction from the absorber extends and contracts, so that the region extending outward in the width direction from the absorber Can be drawn to the front waistline side.

  Moreover, when mounting a tape-type disposable diaper, since a wearer is mounted on the said disposable diaper in the state which expand | deployed the disposable diaper, it becomes easy to be in the state by which an absorber is spread under a wearer's body. By stretching the waist stretchable part outside the absorbent body in the product width direction, when the fastening tape is pulled, the region extending from the waist stretchable part absorbent body can be stretched in the product width direction. Since the front waistline region can be drawn toward the wearer's back side while the rear waistline region is in close contact with the side portion from the wearer's backside waistline, the back waistline region can be more closely attached to the wearer's stomach side.

  In the extended state of the disposable diaper, the angle α formed by the front end portion of the disposable diaper and the side portion extending in the product longitudinal direction from the front end portion in the front notch portion 31 is as shown in FIG. It is an obtuse angle. Further, in the extended state of the disposable diaper, the angle β formed by the rear end portion of the disposable diaper and the side portion extending in the product longitudinal direction from the rear end portion in the rear notch portion 32 is shown in FIG. As shown, it is an acute angle. Specifically, the angle α is 105 degrees and the angle β is 75 degrees. Further, the front notch portion 31 and the rear notch portion 32 are curved in a plan view. In addition, the expansion | extension state of a disposable diaper is the state which extended the disposable diaper until the wrinkle by the leg expansion-contraction part etc. of a disposable diaper is not formed.

  The front notch 31 is a portion that is disposed on the wearer's belly when worn, and is a portion that is easily visible to the wearer. Therefore, for example, if the front notch 31 has an acute angle portion, the wearing assistant may recognize the front notch 31 as a stimulus and cannot obtain a sense of security for the disposable diaper.

  Further, if the front notch 31 has an acute angle, it is difficult to grasp the standard of the front end of the disposable diaper, and the mounting position is not stable, which causes a re-mounting or a positional shift.

  The region on the crotch side of the rear notch 32 is contracted by the waist elastic part 85, and the front end of the rear notch 32 extends outward in the product width direction. Furthermore, as shown in FIG. 6B, the front waistline is drawn to the front waistline via the fastening tape, so that the front end of the rear notch 32 extends outward in the product width direction. Therefore, the fastening tape of the disposable diaper when worn even if the angle β formed by the side portion extending in the product longitudinal direction from the rear end portion in the rear notch 32 is an acute angle in the extended state of the disposable diaper before wearing. At the stage of fixing the skin, the angle β is increased, and the skin irritation can be suppressed.

  In the extended state of the disposable diaper, the length of the front notch 31 in the product longitudinal direction is 10 mm or more and 30 mm or less. The length in the product longitudinal direction of the rear notch 32 is 3 mm or more and 15 mm or less.

  The disposable diaper is lifted by the front notch and the rear notch so that the front waistline approaches the navel side. At this time, since the length of the front notch in the product longitudinal direction is 10 mm or more, interference with the navel can be suppressed even when the disposable diaper is mounted at an appropriate position. On the other hand, if the length of the front notch portion in the product longitudinal direction is longer than 30 mm, the front end portion of the front waistline region is directed outward by the front notch portion even after fastening the fastening tape to the front waistline region. It will be easy to fold and may not be able to cover the wearer's abdomen.

  The length L31 of the front notch 31 in the product longitudinal direction is longer than the length L32 of the rear notch 32 in the product longitudinal direction. When the disposable diaper is attached, the front waistline is lifted by the spread of the rear notch. Therefore, for example, if the length in the product longitudinal direction of the rear notch portion 32 of the disposable diaper is longer than the length in the product longitudinal direction of the front notch portion, the rear notch portion is likely to spread during mounting, as shown in FIG. In the state where the fastening tape shown is fastened, the angle of the fastening tape is more easily attached. When the angle of the fastening tape is further increased, the front end portion of the front waistline region may be easily folded outward. However, by making the length L31 in the product longitudinal direction of the front notch 31 longer than the length L32 in the product longitudinal direction of the rear notch 32, the front end portion of the front waistline is folded outward. Can be suppressed.

  The length W32 in the product width direction of the rear notch 32 is 20 mm or more and 90 mm or less.

  A length W31 in the product width direction of the front notch 31 is 20 mm or more and 90 mm or less.

  The length of the rear notch 32 in the product width direction is preferably 1/3 or less of the length in the width direction of the rear waistline region (the length not including the fastening tape). According to this configuration, a region where a flat shape can be easily maintained exists beyond the region in the width direction of the rear notch 32 on the outer side in the width direction of the rear notch 32. Therefore, the region outside in the width direction from the rear notch 32 can be arranged along the body.

  The absorbent body is formed with a low-rigidity portion including the rear end portion of the absorbent body in which the absorbent core constituting the absorbent body does not exist or the basis weight of the absorbent core is lower than that of other portions. The rear notch 32 is disposed on the outer side in the product longitudinal direction than the low rigidity portion.

  By providing a low-rigidity portion at the rear end of the absorber, the flexibility of the rear end of the absorber is enhanced, and when the rear waistline side is drawn toward the front waistline side, The rear end portion is also easily spread in the width direction.

  The front notch 31 and the rear notch 32 are formed in a region where at least two or more nonwoven fabric sheets are arranged.

  For example, the front notch part 31 and the rear notch part 32 are formed in the area | region where the top sheet 50 and the exterior sheet 60 are arrange | positioned as at least 2 or more nonwoven fabric sheets.

  Here, from the viewpoint of air permeability and flexibility, the front notch portion 31 and the rear notch portion 32 are formed in a region where only two nonwoven fabric sheets, that is, the top sheet 50 and the exterior sheet 60 are disposed. It is preferable.

  According to this configuration, since the film sheet is not disposed in the region where the front notch portion 31 and the rear notch portion 32 are formed, the hardness in the region can be reduced.

  When the back sheet 60a is a non-woven sheet, the front notch portion 31 and the rear notch portion 32 start from the region where the top sheet 50 and the exterior sheet 60 are arranged, the top sheet 50, the back sheet 60a. And it may be formed over the area | region where the exterior sheet 60 is arrange | positioned.

  However, when the back sheet 60a is not a nonwoven fabric sheet but a film sheet or the like, the front notch 31 and the rear notch 32 should not be formed in the region where the back sheet 60a is disposed. .

  Further, the front notch 31 and the rear notch 32 have a convex shape toward the center of the disposable diaper 10 in the product width direction W. When the disposable diaper 10 is viewed in plan, the front notch 31 And the notch line of the rear notch part 32 may have a meandering shape.

  In other words, when the disposable diaper 10 is viewed in plan, the notch line of the front notch portion 31 and the rear notch portion 32 is a curved line having a convex shape stacked in two steps, and the convex shape of the second step The apex of the shape may be arranged at the center in the product width direction W.

  Here, if the notch line of the front notch part 31 and the rear notch part 32 is a curved line having a single convex shape, the front waistline area 20 and the rear waistline area of the disposable diaper 10 are deeply cut out. Give an impression.

  For example, when forming the front notch 31 and the rear notch 32 having a length of 20 mm in the product longitudinal direction L at the center in the product width direction W, the front notch is formed by a curved line having a single convex shape. When the 31 and the rear notch 32 are formed, an impression that anxiety about leakage occurs is given, but when the front notch 31 and the rear notch 32 are formed by a curved line formed by a two-tiered convex shape. It is possible to avoid a situation in which the disposable diaper 10 and the baby's navel portion are scraped without giving an impression that anxiety about leakage occurs.

  In addition, when the front notch 31 and the rear notch 32 are formed by a curved line made of a convex shape stacked in two steps, when the disposable diaper 10 is separated from the wearer's abdomen, in the product width direction W By forming a notch line provided with a plurality of length change points in the product longitudinal direction L, the gap between the wearer's abdomen or back and the disposable diaper 10 can be reduced, and the gap is made conspicuous. Can be eliminated.

Further, in the disposable diaper 10 according to the present embodiment, the number of sheets arranged sequentially increases from the front end portion 10F of the front waistline region 20 toward the center in the product longitudinal direction L of the disposable diaper 10. The number of sheets arranged may increase sequentially from the rear end portion 10R of the rear waistline region 30 toward the center in the product longitudinal direction L of the disposable diaper 10. For example, in the disposable diaper 10 according to the present embodiment, first, the top sheet 50 and the exterior sheet 60 are arranged in the peripheral region of the front end portion 10F in the front waistline region 20. .

  Second, in a region adjacent to the peripheral region of the front end portion 10F of the front waistline region 20, the top sheet 50, the back sheet 60a, and the exterior sheet 60 are disposed.

  Thirdly, in the region including the center in the product longitudinal direction L in the front waistline region 20, the top sheet 50, the core wrap 40b, the back sheet 60a, and the exterior sheet 60 are arranged.

  As described above, when the front notch portion 31 is provided, the front notch portion 31 becomes an inflection starting point, and when a gap is generated between the disposable diaper 10 and the wearer's body (around the abdomen and waist), the front notch A wrinkle extending from the notch 31 in the product longitudinal direction L is likely to occur.

  In addition, as a physique characteristic peculiar to newborn infants and young infants, the circumference of the abdomen protrudes outward, and the change in inclination from the navel to the crotch is larger.

  Therefore, from the target part 95 to the front end part 10F side of the front waistline area 20 from time to time so that the end part of the front waistline area 20 side of the disposable diaper 10 is more along the body with such body characteristics By making the thickness of the disposable diaper 10 main body thinner, the periphery of the front notch 31 for the navel portion is easily along the body of the wearer (newborn, etc.), and the disposable diaper 10 and the wearer It becomes difficult to create a gap between the body and the body.

  Further, in the disposable diaper 10 according to this embodiment, the fibers in the top sheet 50 and the exterior sheet 60 are compressed at the front end portion 10F of the front waistline region 20, and the top sheet is configured to reduce the bulk. The fibers in the 50 and the exterior sheet 60 may be joined by being entangled without being dissolved.

  Here, since the front side end portion 10F of the front waistline region 20 is composed of only a non-woven sheet (fiber layer) without a film sheet, it is lower than the melting point of the fibers constituting the front side end portion 10F. By cutting with a temperature cutter, the fibers in the top sheet 50 and the exterior sheet 60 can be joined in a state of being entangled without being dissolved.

  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 process, the rear cutout portion 32 and the front cutout portion 31 are formed in the continuous body in which the top sheet 50, the backsheet 60a, the absorber 40, and the like are arranged, and then the continuous body is along the product width direction W. And cut into the size of one product. Thereby, the disposable diaper 10 is manufactured. When forming the rear notch 32 and the front notch 31, the rear notch 32 of one disposable diaper and the front notch 31 of another disposable diaper adjacent to the one disposable diaper, An integrated opening is formed. Next, the opening is divided by cutting the continuous body into the size of one product along the product width direction W, and a rear notch 32 is formed in one disposable diaper, and adjacent to the one disposable diaper. A front notch 31 is formed in another disposable diaper.

  Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  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.

10: disposable diapers
10F: Front end
10R: Rear end
20: Front waist area
25: Inseam area
30: Rear waist area
35: Leg opening
40: Absorber
40a: Absorbent core
40b: Core wrap
50: Top sheet
60: exterior sheet
60a: Back sheet
70: Side flap
71: Elastic member
75: Leg stretchable part
75I: Inner edge area in the width direction
80: Legside gather
81: Joint part
81A: First joint
81B: Second joint part
82: Free end portion
84: Contraction
85: waist elastic part
90: Fastening tape
91: Base sheet
92: Hook sheet
95: Target section
110: Low rigidity part
115: Absorber notch
125: Absorber notch
200: Crotch expansion / contraction part
L: Product longitudinal direction
W: Product width direction α: Angle β: Angle

Claims (8)

A front waistline region, a back waistline region, a crotch region located between the front waistline region and the back waistline region;
Product longitudinal direction from the front waistline region to the rear waistline region,
A product width direction orthogonal to the product longitudinal direction;
Straddling the crotch region, an absorber 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 the wearer's body;
A disposable diaper comprising a pair of fastening tapes extending from the rear waistline region to the outside in the product width direction and fastened to the front waistline region,
In the front waistline region, a front notch is formed in a region including the center in the product width direction and the end in the product longitudinal direction,
A rear notch is formed in a region including the end in the product longitudinal direction in the center of the product width direction in the rear waistline region,
The rear notch portion is provided on the outer side in the product longitudinal direction from the waistline holding portion, and is separated from the waistline holding portion ,
Between the rear notch part and the waistline holding part, there is provided an elastic part that expands and contracts at least in the product width direction,
The disposable diaper , wherein the stretchable part and the rear notch part are separated in the product longitudinal direction .   A top sheet made of non-woven fabric, disposed on the skin-facing surface side of the absorbent body;
  A back sheet that is disposed on the non-skin facing surface side of the absorbent body and functions as a leak-proof sheet;
  An exterior sheet made of non-woven fabric, disposed on the non-skin facing surface side of the back sheet,
  The disposable diaper according to claim 1, wherein the rear notch and the front notch are formed in a region where the back sheet is not disposed and the top sheet and the exterior sheet are disposed. The disposable diaper according to claim 1 or 2, wherein a length of the stretchable part in the product width direction is longer than a length of the absorbent body in the product width direction. In the extended state of the disposable diaper, the angle formed by the front end portion of the disposable diaper and the side portion extending in the product longitudinal direction from the front end portion in the front notch portion is an obtuse angle,
The angle formed by the rear end portion of the disposable diaper and the side portion extending in the product longitudinal direction from the rear end portion in the rear notch portion is an acute angle. The disposable diaper described in Crab. In the extended state of the disposable diaper, the length in the product longitudinal direction of the front notch is 10 mm or more and 30 mm or less,
The disposable diaper in any one of Claims 1-4 whose length of the said product longitudinal direction of the said rear notch part is 3 mm or more and 15 mm or less.   The disposable diaper according to claim 5, wherein a length of the front notch portion in the product longitudinal direction is longer than a length of the rear notch portion in the product longitudinal direction. In the absorbent body, there is no absorbent core constituting the absorbent body, or a low-rigidity part having a lower basis weight of the absorbent core than other parts is formed including the rear end of the absorbent body,
The disposable diaper according to any one of claims 1 to 6, wherein the rear notch is disposed on the outer side in the product longitudinal direction with respect to the low rigidity portion.   The disposable diaper according to any one of claims 1 to 7, wherein the notch line of the front notch is a curved line having a convex shape stacked in two steps in plan view.

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