JP6240411B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper including a fastening tape in one of a front waistline region and a rear waistline region.

  The open-type disposable diaper includes a front waistline region, a crotch region, and a rear waistline region, and includes a fastening tape that detachably fastens the front waistline region and the rear waistline region. In the disposable diaper provided with such a fastening tape, a structure in which the fastening tape is softened by making the rigidity of the outer portion in the product width direction of the fastening tape lower than the rigidity of the inner portion is known (for example, patent) Reference 1). According to such a fastening tape, even when a wearer such as an infant moves, the fastening tape does not easily come off from the target portion.

Japanese Patent Laying-Open No. 2005-7159 (page 6, FIG. 2)

  In the open-type disposable diaper as described above, a tab for picking without a hook sheet provided with an engagement hook is often provided at the outer end of the fastening tape in the product width direction. When such a tab is in a floating state, the end portion of the fastening tape is easily peeled off from the target portion. Further, when the wearer is an infant, the tab may be pulled carelessly, and the fastening tape may come off the target portion.

  In addition, in recent years, the absorbent body including the absorbent core and the like is thin with the soft fastening tape as described above, and the absorbent body is more flexible than the conventional one, so the fastening tape cannot follow the deformation of the absorbent body, Fastening tape is easy to come off the target part.

  Therefore, the present invention has been made in view of such circumstances, and disposable diapers that can prevent the fastening tape from being inadvertently peeled off from the target portion while ensuring the flexibility of the entire disposable diaper. For the purpose of provision.

A feature of the present invention is that it is composed of a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and a crotch region (inseam region 25), and includes a vertically long absorption including a liquid-retaining absorbent core. A body (absorber 40), a side flap (side flap 70) provided on at least a part of a side edge in the width direction of the absorber, and the front waistline region or the rear waistline region attached to the side flap A pair of fastening tapes (fastening tape 90) configured to extend from one side of the absorbent body to the outside in the product width direction (product width direction W) and to be fixed to the other of the front waistline region or the rear waistline region A disposable diaper (disposable diaper 10) comprising: a base sheet (base sheet 91) extending from the side flap; and a skin contacting surface of the base sheet. A hook sheet (hook sheet 92) provided with a plurality of engagement hooks, the hook sheet being provided up to an end of the base sheet in the product width direction, KES bending rigidity value per unit length in the product width direction of the fastening tape in the hook sheet existent region that is present (hook sheet existent region SHS) is state, and are less 0.015974 N · cm ² / cm, the skin of the fastening tape The contact surface is formed with embossed squeezed from the skin contact surface side toward the non-skin contact surface side, and the density of the emboss in the hook sheet existing area is determined from the product width direction inner side to the product width. The gist is that the bending rigidity of the hook sheet increases as it goes outward in the direction, and the bending rigidity of the hook sheet decreases as it goes from the inner side in the product width direction to the outer side in the product width direction .

  According to the features of the present invention, it is possible to provide a disposable diaper that can prevent the fastening tape from being inadvertently detached from the target portion while ensuring the flexibility of the entire disposable diaper.

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. FIG. 3 is an enlarged plan view of a fastening tape 90 according to an embodiment of the present invention. It is sectional drawing of the fastening tape 90 along the F3-F3 line | wire shown in FIG. It is a top view by the side of the skin contact surface of fastening tape 90A concerning the example of a change of the present invention. It is a top view of the skin contact surface side of the fastening tape 90B which concerns on the example of a change of this invention.

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

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

(1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper 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. Developed plan view shown in FIG. 1, the topsheet 50 constituting the disposable diaper, to a state in which wrinkles such as side flaps 70 are not formed, the state of being stretched elastic member 71 of the leg stretch unit 75 and the leg side gathers 80 FIG.

  4 is an enlarged plan view of the fastening tape 90, and FIG. 5 is a cross-sectional view of the fastening tape 90 along line F3-F3 shown in FIG.

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

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

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

  The disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 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.

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

  The surface side (top sheet 50 side) of the absorbent body 40 is formed along a leg opening 35 that is recessed toward the center in the product width direction W of the absorbent body 40, and a pair of stretchable in the product longitudinal direction L. A leg expansion / contraction part 75 is provided.

  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 stretchable part 75 is curved from the crotch region 25 toward the fastening tape 90.

  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.

<Legside gather>
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.

  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.

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

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

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

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

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

  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.

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

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

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

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

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

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

  In the present embodiment, the waist stretchable portion 85 exists beyond the side edge in the product width direction W of the absorbent core 40a, so that the rear waistline region in the product longitudinal direction L while forming the disposable diaper 10 in a cup shape. About the absorptive core 40a of a position from the edge part side of 30 side, it can be made to follow a wearer's body positively. Furthermore, at least a part of the waist elastic part 85 and the low rigidity region 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 from the notch 110 is convex toward the rear waistline region. Therefore, as described above, in addition to facilitating the formation of a cup shape in which the disposable diaper 10 swells on the non-skin surface side, the surface area of the absorbent core 40a is maintained, so excretion from the end of the absorbent core 40a It can prevent leakage of things.

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

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

<Bending stiffness of absorber>
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) x (Auxiliary weight coefficient) x 9.81 x 10 ^-2
If the test piece cannot be 38 mm wide, convert it to a 38 mm wide bending moment.

  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.

<Fastening tape and target configuration>
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 connected to the side flap 70, and is provided with a base sheet 91 extending from the side flap 70 and engagement hooks (not shown) as a plurality of engaging members, and fixed to the base sheet 91. Hook sheet 92 is provided. The fastening tape 90 has a tapered shape in which the width in the product longitudinal direction L becomes narrower toward the outside in the product width direction W.

  The hook sheet 92 is an area provided on a part of the skin contact surface of the base sheet 91 and provided with a plurality of engagement hooks. The above-described waistline holding portion extends from the hook sheet 92 in the width direction. It is. Further, the hook sheet 92 is provided to the end of the base sheet 91 outside the product width direction W. Furthermore, in the present embodiment, the hook sheet 92 is provided up to the end of the base sheet 91 outside the product longitudinal direction L. That is, the hook sheet 92 is provided over the entire area of the base sheet 91 in the outer portion of the fastening tape 90 in the product width direction W.

  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.

  In the present embodiment, the portion of the side flap 70 to which the fastening tape 90 is joined can be configured by an element that can be expanded and contracted along the product width direction W. Furthermore, an element that can be expanded and contracted along the product width direction W is provided between one of the pair of left and right fastening tapes 90 and the other of the fastening tapes 90. Specifically, a stretchable nonwoven fabric can be used as the stretchable element. For example, a thermoplastic elastomer resin such as urethane or styrene is melted to form a film-like stretchable film, a nonwoven fabric made of those stretchable fibers, or a stretchable film or stretchable nonwoven fabric that is partially cut or weakened. A composite sheet obtained by laminating a non-stretchable sheet that has been made can be used. Instead of the stretchable sheet, a stretchable nonwoven sheet constituted by arranging polyurethane elastic elements in parallel on a non-stretchable nonwoven fabric may also be used.

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 (the total basis weight in the case of a plurality of sheets) is 30 to 100 g / m ² , preferably 40 to 90 g / m ² .

Further, the KES bending rigidity value per unit length in the product width direction W of the fastening tape 90 in the hook sheet existence area SHS where the hook sheet 92 exists is 0.015974 N · cm ² / cm or less.

Here, Table 1 shows the configuration of the base sheet 91 and the KES bending stiffness value according to the examples and comparative examples of the fastening tape 90.

  The bending rigidity value of the fastening tape 90 was measured using a KES bending measuring machine manufactured by Kato Tech Co., Ltd. Specifically, the B value was measured.

  Specifically, the details of the KES method are explained in "Standardization and Analysis of Texture Evaluation" 2nd Edition (issued by the Japan Textile Machinery Society, Texture Measurement and Standardization Research Committee issued on July 10, 1980). ing. Therefore, only the measurement conditions related to this measurement will be described with respect to the measurement method for each mechanical property.

  KES flexural rigidity value is fixed between each chuck using KES-FB2 manufactured by Kato Tech Co., Ltd. (with the skin side (inside) of the fastening tape in diapers facing downward), maximum curvature + 2.5cm- It was measured by bending to the front side up to 1 and then bending back to the maximum curvature of -2.5 cm-1 before returning. Table 1 measures both the bending stiffness value in the product longitudinal direction L and the bending stiffness value in the product width direction W, and shows a larger value of both measured values.

  Further, the engaging force of the fastening tape 90 is preferably set to 0.3 N / 30 mm or more and 1.5 N / 30 mm or less. The engagement force can be measured using an autograph tester (AG-X10plus) manufactured by Shimadzu Corporation. Specifically, a sample cut out from the fastening tape to be measured with a hook sheet and a base sheet of 30 mm in width (if it is impossible to cut out with a width of 30 mm, the result is converted per 30 mm width) prepare. Similarly, a sample is prepared by cutting out the target tape to which the fastening tape is locked in a size larger than the hook sheet.

  Next, a 700 g roller (85 mm in diameter and 45 mm in width) is moved at a speed of 5 mm / min along the direction of attaching and detaching the main fastening tape to crimp both samples. Set both the crimped samples on an autograph testing machine and measure the engaging force of both samples at a pulling speed of 300 mm / min (unit: N / 30 mm). At this time, the pulling direction is set so that the hook sheet surface is at an angle of 135 ° with respect to the target tape surface. The peel direction of the hook sheet is the main attaching / detaching direction when operating (attaching / detaching) the fastening tape.

  It has been confirmed that when the engaging force of such a fastening tape is too large, the tester (a mother with an infant) tends to have an impression that it is difficult to attach and detach. On the other hand, if the engagement force is too small, the fastening tape gives an impression that it is difficult to engage with the disposable diaper main body. In fact, even if the fastening tape does not come off, there is an impression that the fastening tape will come off. I understand that. Therefore, in the examples and comparative examples shown in Table 1, the engagement force of the fastening tape 90 was adjusted to be 0.3 N / 30 mm or more and 1.5 N / 30 mm or less.

  The “test result” shown in Table 1 indicates a result as to whether or not the end of the fastening tape 90 in the product width direction W is in a state where it can be touched by an infant. In this test, the disposable diaper 10 provided with the fastening tape 90 according to the example or the comparative example is attached to an infant, and the attached disposable diaper 10 is used as usual, and the fastening tape 90 is replaced when the disposable diaper 10 is replaced. The presence or absence of lifting from the target portion 95 at the end in the product width direction W was visually confirmed. Ten disposable diapers 10 samples were provided for each of 10 test subjects, for a total of 100 samples.

  Of the 100 samples, samples with two or less floats were rated as “good”, and samples with three or more floats were rated as “bad”.

  In addition, as described above, by making the number of sheets (nonwoven fabrics) of the base sheet 91 a plurality of sheets instead of one, the weight of each sheet is lowered, and the strength of the fastening tape 90 is increased while reducing the thickness. Can be made flexible.

  On the other hand, in the case of a single sheet, it is necessary to secure strength while reducing the basis weight of the sheet and increasing the flexibility by reducing the thickness, for example, embossing the nonwoven sheet Is mentioned. In this case, the embossing is preferably a line embossing rather than a point embossing (however, not all embossing needs to be connected). In addition, by arranging the line embosses so as not to cross each other, the strength can be increased while maintaining more flexibility.

Further, in the relationship between the inner bending (the bending in the direction in which the engaging element (hook sheet 92) side of the fastening tape 90 approaches) and the outer bending, the fastening tape 90 can be made the same by making the outer bending easier than the inner bending. Even when it has flexibility, it is easier to follow the change of the disposable diaper 10. By making the sheet thickness of the inner layer (hook sheet 92 side) of the nonwoven fabric thicker than that of the outer layer, it becomes easier to bend outwardly than inwardly. The sheet thickness (thickness of the nonwoven fabric) can be measured by using, for example, a Peacock dial thickness gauge manufactured by Ozaki Seisakusho Co., Ltd., and adjusting the diameter of the circular probe to 10 mm and a load of 3.0 g / cm ^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.

(2) Leg expansion / contraction part The leg expansion / contraction part 75 is arrange | positioned along the leg periphery opening part 35 provided in the product width direction outer side rather than the absorber 40, and is comprised so that expansion-contraction in the product longitudinal direction L is possible. The leg stretchable part 75 has a width direction inner end region 75I whose position in the width direction is located on the innermost side in the crotch region. The leg opening 35 and the leg stretchable part 75 extend toward the outer side in the product width direction from the crotch region 25 toward the outer side in the product longitudinal direction, particularly in the rear waistline region. The width direction inner end region 75I of the leg stretchable part 75 may be arranged continuously in the product longitudinal direction or may not be continued in the product longitudinal direction. In the present embodiment, the region in which the position in the width direction of the leg opening 35 is located on the innermost side in the crotch region coincides with the width direction inner end region 75I of the leg stretchable portion 75, but does not necessarily coincide. It does not have to be.

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

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

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

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

  The elongation ratio of the leg stretchable part 75 is preferably 1.5 to 2.2 times. In this embodiment, the expansion ratio of the leg stretchable part 75 is set to 1.8 to 2.0 times. The elongation rate means the degree of elongation of the leg stretchable part, 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. 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.

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

  The crotch stretchable part 200 is provided independently of the front waistline area 20 and the back waistline area 30, and the leg stretchable part 75. In the position where the crotch stretchable part 200 overlaps with the absorbent core 40a (in this embodiment, the position between the core wrap 40b wrapping the absorbent core 40a and the backsheet 60a), the width direction of the absorbent core 40a at the overlapping position It is configured to shrink more than 60% of its length. That is, the crotch stretchable part 200 is preferably formed in a region of 60% or more of the width in the product width direction W of the absorbent core 40a.

  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.

  In the present embodiment, the width of the crotch stretchable part 200 in the disposable diaper 10 is not less than ½ of the width of the absorbent core 40a in the product width direction W in the region where the crotch stretchable part 200 of the absorbent core 40a exists. It is. Therefore, the crotch expansion / contraction part 200 contracts a certain width or more of the portion where the absorbent core 40a is disposed, so that the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body.

  By realizing the lifting of the absorbent core 40a in the crotch region 25, the gap between the disposable diaper 10 and the wearer can be reduced. When the width of the crotch stretchable part 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W, more preferably 80% or more, disposable diapers The gap between 10 and the wearer can be further reduced.

  Furthermore, if the width of the crotch expansion / contraction part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a described above. On the other hand, when the width of the crotch stretchable part 200 is too wide compared to the width of the absorbent core 40a, the portion where the absorbent core 40a is not disposed contracts more than the portion where the absorbent core 40a is disposed The disposable diaper 10 is attached. As a result, the members constituting the portion where the absorbent core 40a is not disposed are overlapped, the crotch stretchable portion 200 is hardened, and the comfort of the disposable diaper 10 is impaired.

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

  Further, the portion where the width of the absorbent core 40a is the narrowest in the product width direction W is preferably provided 10 to 60 mm in front of the center line CL in the product longitudinal direction L, and the width of the absorbent core in the product width direction W The narrowest part is preferably provided on the front side by 20 to 40 mm with respect to the center line CL. The crotch expansion / contraction part 200 is preferably formed across a region where the width of the absorbent core 40a is narrowest in the product width direction W.

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

  The crotch stretchable part 200 as described above 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 the elongation rate is defined as follows. 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.

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

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

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

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

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

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

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

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

  In the component mounting step, disposable diapers such as a stretchable sheet constituting the leg stretchable part 75, another web such as a web constituting the top sheet, a leakproof sheet, an absorber, etc. on the web constituting the backsheet The component which comprises 10 is mounted.

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

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

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

(5) Action / Effect According to the disposable diaper 10 described above, the hook sheet 92 having a plurality of engagement hooks is provided to the end of the base sheet 91 outside the product width direction W. Further, the KES bending rigidity value per unit length in the product width direction W of the fastening tape 90 in the hook sheet existence area SHS where the hook sheet 92 exists is 0.015974 N · cm 2 / cm or less.

  For this reason, the outer end of the fastening tape 90 in the product width direction W is difficult to come off from the target portion 95, and even when the wearer is an infant, the fastening tape 90 (tab) is inadvertently pulled, and the fastening tape becomes the target tape. Can be prevented from coming off. Further, since the fastening tape 90 has a low KES bending rigidity and is soft like the absorber 40, the fastening tape 90 easily follows the deformation of the absorber 40, and the fastening tape 90 does not easily come off the target portion 95. That is, according to the disposable diaper 10, it is possible to prevent the fastening tape 90 from being inadvertently peeled off from the target portion 95 while ensuring the flexibility of the entire disposable diaper.

  In the present embodiment, a pair of leg stretchable parts 75 that extend along the leg opening 35 and can be stretched along the product longitudinal direction L are provided, and the leg stretchable part 75 extends from the crotch region 25 to the fastening tape. Curved toward 90. The fastening tape 90 is attached to the stretchable nonwoven fabric that constitutes the side flap 70.

  For this reason, when the disposable diaper 10 is worn, the fastening tape 90 is pulled to the proximal end side of the fastening tape 90, and the fastening tape 90 is more strongly engaged on the proximal end side. On the other hand, the distal end side is pulled toward the proximal end side, so that a load is applied in the direction in which the fastening tape 90 is prevented from bending toward the disposable diaper 10 side, and the distal end side is easily separated. In the embodiment, since the hook sheet 92 exists up to the front end portion of the fastening tape 90 and is flexible, it is difficult to disengage the hook sheet 92 on the front end side. That is, the engagement property of the fastening tape 90 as a whole is enhanced, and it is possible to more reliably prevent the fastening tape 90 from being detached due to the movement of the wearer and the wearing tape 90 being inadvertently removed by the wearer.

  In the present embodiment, the fastening tape 90 has a tapered shape in which the width in the product longitudinal direction L becomes narrower toward the outside in the product width direction W. For this reason, the front end portion side of the fastening tape 90 can be more strongly engaged with the target portion 95, and the fastening tape 90 can be further reliably prevented from coming off.

  In the present embodiment, since the engaging element (hook sheet 92) is present up to the product width direction W of the fastening tape 90, when the disposable diaper 10 is worn, the product longitudinal direction of the region where the crotch stretchable part 200 is formed. The fastening tape 90 is engaged with an extended region along L (on the absorbent core 40a). When the fastening tape 90 is engaged in this way, the region from the abdominal side of the absorbent core 40a lifted along the wearer's body by the crotch stretchable part 200 is reliably pressed by the fastening tape 90, and the wearer Displacement around the waist is difficult to occur.

  In particular, the baby's abdomen tends to jump out greatly after meals, and the crotch part of the absorbent core 40a is lifted and the abdomen side is pressed with the left and right fastening tapes 90. By following along the body, it is possible to reduce the gap between the ventral side and the disposable diaper 10 and the body. Further, even if force is applied to the end portion of the fastening tape 90, the end portion is pressed down, so that it is easy to maintain the wearing state of the disposable diaper 10 that is not displaced even when the wearer moves.

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

  For example, the embodiment of the present invention can be modified as follows. FIG. 6 is a plan view of the skin contact surface side of the fastening tape 90A according to the modified example of the present invention. As shown in FIG. 6, the skin contact surface (inner surface) of the fastening tape 90 </ b> A is formed with an emboss 120 squeezed from the skin contact surface side toward the non-skin contact surface (outer surface) side. Yes. The emboss 120 is formed so as to straddle part of the hook sheet 92 and the boundary B between the hook sheet 92 and the base sheet 91. According to such a fastening tape 90A, since the emboss 120 compressed from the skin contact surface side toward the non-skin contact surface (outer surface) side is formed, the rigidity is higher than that of the base sheet 91. The high hook sheet 92 can easily follow the bending of the base sheet 91, and as a result, the bending rigidity of the fastening tape 90 as a whole can be suppressed.

  FIG. 7 is a plan view of the skin contact surface side of a fastening tape 90B according to another modification of the present invention. In the fastening tape 90B, the density of the emboss 120, that is, the density of the emboss 120, increases from the inner side in the product width direction W toward the outer side in the product width direction W. The density of the emboss 120 can be indicated by the ratio of the area of the emboss 120 forming area in a predetermined area in the fastening tape 90B. According to the fastening tape 90B, since the bending rigidity decreases as it goes outward in the product width direction W of the fastening tape 90B, it is particularly effective that the outer end of the fastening tape 90B in the product width direction W is detached from the target portion 95. Can be prevented. Although the emboss 120 pattern shown in FIGS. 6 and 7 is a lattice shape, the pattern is not limited to such a pattern, and may be a dot shape or a stripe shape.

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

10 ... disposable diapers
20 ... Front waist area
25 ... Inseam
30 ... rear waist area
35… Leg opening
40 ... absorber
40a… absorbent core
40b ... Core wrap
50… Top sheet
60… Exterior sheet
60a… Back sheet
70 ... side flap
71 ... Elastic member
75 ... Leg stretchable part
75I ... Inner width region of leg stretchable part
80… Legside gather
81 ... Junction
81A ... 1st joint part
81B ... Second joint
82 ... Free end
84 ... contraction
85 ... Hip elastic part
90, 90A, 90B… Fastening tape
91 ... Base sheet
92 ... Hook sheet
95 ... Target section
110 ... Notch
115 ... Notch
120 ... Emboss
125 ... Notch
200 ... Crotch expansion / contraction part

Claims (11)

A vertically long absorbent body composed of a front waistline region, a back waistline region, and a crotch region, including a liquid-retaining absorbent core ;
A side flap provided on at least a part of a side edge in the width direction of the absorber;
Attached to the side flaps, extends from one of the front waistline region or the rear waistline region to the outside in the product width direction of the absorber, and is fixed to the other of the front waistline region or the rear waistline region A disposable diaper comprising a pair of fastening tapes,
The fastening tape includes a base sheet extending from the side flap, and a hook sheet provided on a part of the skin contact surface of the base sheet and provided with a plurality of engagement hooks,
The hook sheet is provided up to the outer end of the base sheet in the product width direction,
KES bending rigidity value per unit length in the product width direction of the fastening tape in the hook sheet existent region of the hook sheet is present state, and are less 0.015974N · cm ² / cm,
On the skin contact surface of the fastening tape, an embossed squeezed from the skin contact surface side toward the non-skin contact surface side is formed,
The density of the embossment in the hook sheet presence area increases from the product width direction inner side to the product width direction outer side,
The disposable diaper , wherein the bending rigidity of the hook sheet existing area decreases as it goes from the inner side in the product width direction to the outer side in the product width direction . The disposable diaper according to claim 1, wherein the embossing of the fastening tape serves as a base point for bending deformation of the fastening tape.   The disposable diaper according to claim 1 or 2, wherein a portion of the side flap to which the fastening tape is joined is configured by an element that can be expanded and contracted in the product width direction. The absorbent body has a pair of leg stretchable parts extending in the product longitudinal direction along the leg-hole opening recessed toward the center in the product width direction of the absorbent body, and at least partially stretchable along the product longitudinal direction. ,
The disposable diaper according to any one of claims 1 to 3, wherein the leg stretchable part is curved from the crotch region toward the fastening tape. Wherein is formed at a position overlapping with the previous Ki吸 Osamusei core in the crotch region, and a crotch stretch unit having elasticity,
The crotch stretchable part is
Formed in a region of 60% or more of the width in the product width direction of the absorbent core,
The disposable diaper of Claim 4 provided independently from the said front waist area and the said back waist area, and the said leg expansion-contraction part. The disposable diaper according to any one of claims 1 to 5 , wherein the emboss is formed so as to straddle at least a part of the hook sheet and a boundary between the hook sheet and the base sheet. The disposable diaper according to any one of claims 1 to 6 , wherein the fastening tape has a tapered shape in which the width in the product longitudinal direction becomes narrower toward the outside in the product width direction. The disposable diaper according to any one of claims 1 to 7 , wherein the hook sheet is provided up to an end of the base sheet in the product longitudinal direction. The disposable diaper as described in any one of Claims 1 thru | or 8 with which the element which can be expanded-contracted along the product width direction is provided between one side of the said fastening tape, and the other side of the said fastening tape. The disposable diaper according to any one of claims 1 to 8 , wherein a portion of the side flap to which the fastening tape is connected is configured by an element that can be expanded and contracted along a product width direction. The disposable diaper according to any one of claims 1 to 10 , wherein an engaging force of the fastening tape is 0.3 N / 30 mm or more and 1.5 N / 30 mm or less.

Images