JP5249461B1 - Disposable diapers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a front waist area of a disposable diaper while suppressing a gap generated between the disposable diaper and a wearer when the disposable diaper is sealed in a package in a folded state. And the disposable diaper which makes it possible to also suppress the shift | offset | difference to the crotch direction of a back waist area is provided.
A disposable diaper 10 has a crotch stretchable part 200 formed at a position overlapping an absorbent body 40 in a crotch region 25. Crotch stretch unit 200 is formed astride a virtual product center line VL _T, and overlaps the folded line FL. Virtual crotch center line VL _C is provided in front of the imaginary product centerline VL _T, 2 fold line FL is provided on the rear side of the imaginary product centerline VL _T.
[Selection] Figure 1

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 including an absorbent body extending in the front waistline region and the back waistline region Are known.

  In such disposable diapers, various devices have been devised in order to realize good comfort while preventing leakage of excrement. For example, there is a structure in which the absorbent body is divided into three parts in the product longitudinal direction, and an elastic member (for example, leg gathers or three-dimensional gathers) that is extended along the product longitudinal direction is disposed outside the absorbent body in the product width direction. Known (for example, Patent Document 1).

  According to such a disposable diaper, when the absorbent body divided into three parts is worn, the disposable diaper fits the wearer by close contact with the adjacent absorbent body. A gap between the disposable diaper and the wearer is suppressed.

  By the way, when enclosing a disposable diaper in a package, a disposable diaper is folded so that a skin contact surface may become inside (for example, patent document 2).

JP 2004-141270 A JP-A-2005-329106

  In the disposable diaper described above, the entire product width direction of the disposable diaper contracts in the product longitudinal direction due to the contraction force of an elastic member such as a leg gather or a three-dimensional gather, and the disposable diaper comes into close contact with the wearer. As a result, the front waistline region and the back waistline region of the disposable diaper are easily pulled down in the crotch direction. In particular, after the disposable diaper absorbs the excrement, the front waist area and the back waist area of the disposable diaper are displaced in the crotch direction, and an unnecessary gap is created between the wearer's legs and the disposable diaper. Cheap.

  The disposable diaper is folded and sealed in a package, and a certain pressure is applied to the disposable diaper. The disposable diaper is folded so that the skin contact surface is on the inside. Therefore, the disposable diaper is formed with a fold having a convex shape in a direction away from the wearer. Due to such creases, a gap is formed between the disposable diaper and the wearer, and the gap generated between the disposable diaper and the wearer when the disposable diaper is worn is promoted. In order to suppress the gap generated between the disposable diaper and the wearer due to the crease, it is conceivable to increase the contraction force of the elastic member, but in the crotch direction of the front waist region and the back waist region of the disposable diaper The gap will be larger.

  Therefore, the present invention has been made to solve the above-described problems, and even when the disposable diaper is enclosed in a package in a folded state, the disposable diaper and the wearer when wearing the disposable diaper An object of the present invention is to provide a disposable diaper that can suppress a gap in the crotch direction of the front waistline region and the back waistline region of the disposable diaper while suppressing a gap generated between the disposable diaper.

  The disposable diaper according to the first feature has a front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region, and from the front waistline region to the back waistline region And a product width direction perpendicular to the product longitudinal direction. The disposable diaper is formed at the position overlapping the absorber in the crotch region, and the absorbent body extending over at least one of the front waistline region and the rear waistline region, straddling the crotch region, and having elasticity Crotch expansion and contraction part. The crotch stretchable part is formed in a stretched state of the disposable diaper, straddling a virtual product center line extending along the product width direction through the center of the disposable diaper in the product longitudinal direction, and In the natural state of the disposable diaper, the front waistline region and the rear waistline region overlap with each other in a crotch region and a double fold line extending along the product width direction. When the disposable diaper is in an extended state, a virtual crotch center line that passes through the center of the crotch stretchable part in the product longitudinal direction and extends along the product width direction is provided in front of the virtual product center line. The two-fold line is provided behind the virtual product center line in the product longitudinal direction.

  According to the present invention, even when the disposable diaper is enclosed in a package in a folded state, the disposable diaper is suppressed while suppressing a gap generated between the disposable diaper and the wearer when the disposable diaper is worn. It is possible to provide a disposable diaper that can suppress a shift in the crotch direction of the front waistline region and the back waistline region.

FIG. 1 is a developed plan view of a disposable diaper 10 according to the first embodiment. FIG. 2 is a cross-sectional view of the disposable diaper 10 taken along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along line F2-F2 shown in FIG. FIG. 4 is a cross-sectional view of the disposable diaper 10 according to the first modification. FIG. 5 is a developed plan view of the disposable diaper 10 according to the second modification.

  Hereinafter, a disposable diaper according to an embodiment of 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. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
The disposable diaper according to the embodiment has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the rear waistline region, and travels from the front waistline region to the rear waistline region. It has a product longitudinal direction and a product width direction orthogonal to the product longitudinal direction. The disposable diaper is formed at the position overlapping the absorber in the crotch region, and the absorbent body extending over at least one of the front waistline region and the rear waistline region, straddling the crotch region, and having elasticity Crotch expansion and contraction part. The crotch stretchable part is formed in a stretched state of the disposable diaper, straddling a virtual product center line extending along the product width direction through the center of the disposable diaper in the product longitudinal direction, and In the natural state of the disposable diaper, the front waistline region and the rear waistline region overlap with each other in a crotch region and a double fold line extending along the product width direction. When the disposable diaper is in an extended state, a virtual crotch center line that passes through the center of the crotch stretchable part in the product longitudinal direction and extends along the product width direction is provided in front of the virtual product center line. The two-fold line is provided behind the virtual product center line in the product longitudinal direction.

  In the embodiment, the crotch stretchable part is formed at a position overlapping the absorber in the crotch region. The crotch expansion / contraction part is formed across the virtual product center line and overlaps with the double fold line. Therefore, even when the gap between the disposable diaper and the wearer generated when the disposable diaper is worn is suppressed by the contraction force of the elastic member such as the leg gather or the three-dimensional gather, the absorbent body (that is, from other parts) Also, recumbent ribs are not randomly formed in a portion having high rigidity. Further, the crotch stretchable part has stretchability and is formed at a position overlapping the absorber. Thereby, in a state where the front waistline region and the back waistline region are held on the wearer's body, the crotch region including the double fold line is lifted together with the absorbent body so as to approach the wearer's body by contraction of the crotch expansion and contraction part. Therefore, the gap between the disposable diaper 10 and the wearer is suppressed at the folding line.

  Thus, even when the disposable diaper is enclosed in a package in a folded state, while suppressing the gap generated between the disposable diaper and the wearer when wearing the disposable diaper, the front waistline of the disposable diaper Deviation in the crotch direction of the region and the rear waistline region can also be suppressed.

  In the embodiment, the virtual crotch center line is provided in front of the virtual product center line, and the fold line is provided in rear of the virtual product center line. That is, the crotch expansion / contraction part is provided to be biased to the front side of the disposable diaper in the product longitudinal direction. Therefore, in the state where the disposable diaper is attached to the wearer, it is easy to align the height of the front end portion of the front waistline region with the height of the rear end portion of the rear waistline region, and the crotch is located at a position corresponding to the crotch region of the wearer. A telescopic part is arranged.

[First Embodiment]
(1) Schematic configuration of disposable diaper Hereinafter, a schematic configuration of the disposable diaper will be described. FIG. 1 is a developed plan view of a disposable diaper 10 according to the first embodiment. FIG. 2 is a cross-sectional view of the disposable diaper 10 taken along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along line F2-F2 shown in FIG. The developed plan view shown in FIG. 1 is a state in which the elastic members 71 such as the leg stretchable portion 75 and the leg side gathers 80 are stretched until the top sheet 50 constituting the disposable diaper 10 and the side flap 70 are not formed with the heel. 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). Moreover, the back waistline area 30 is a part which contacts a wearer's back waistline part (back part). The crotch region 25 is located between the front waistline region 20 and the rear waistline region 30.

  Further, the disposable diaper 10 is formed with a pair of leg-hole openings 35. The leg opening 35 is provided at the side end of the disposable diaper 10 in the product width direction W, and is disposed along the wearer's leg in a state where the disposable diaper 10 is worn by the wearer. It is.

  In the first 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 absorber 40 that straddles the crotch region 25 and extends to at least one of the front waistline region 20 and the rear waistline region 30. The absorber 40 is comprised by the absorptive core 40a and the core wrap 40b.

  The absorbent core 40a is similar to a conventional disposable diaper, and is composed of an absorbent polymer (SAP) and a predetermined fiber. The predetermined fiber is, for example, pulp fiber or thermoplastic fiber. 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, the mass of about 10 to 30 g / ^{m 2} of air-through fibrous nonwoven fabric, spunbonded nonwoven fabric, SMS (spunbond - meltblown - spunbonded) can be used nonwoven, or mass of about 10 to 30 g / ^{m 2} tissue sheet.

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

  A pair of side flaps 70 are provided on the side edges of the absorbent body 40 in the product width direction W, respectively. 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 to hold 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 fixed to each other.

  In the first 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 portion extending along the product width direction W 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 portion that extends along the product width direction W from the region where the target portion 95 is provided.

  Moreover, the disposable diaper 10 is formed in the position which overlaps with the absorber 40 in the crotch region 25, and is provided with the crotch expansion-contraction part 200 which has a stretching property. The configuration of the crotch expansion / contraction unit 200 will be described in detail later.

  The front surface side (top sheet 50 side) of the absorber 40 is formed around the leg opening 35 and is provided with a pair of leg stretchable portions 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 the product longitudinal direction L, may be arrange | positioned along the leg periphery opening part 35, and one part is leg periphery opening. You may arrange | position in the state inclined with respect to the part 35. FIG.

  The leg stretchable portion 75 is a portion that is substantially contracted in the product longitudinal direction L 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 contractile force is not exerted. In addition, the structure of the leg expansion-contraction part 75 is demonstrated 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 ends of the side flaps 70 in the product width direction W, and are upright stretchable gathers that are disposed on the inner side of the leg stretchable parts 75 in the product width direction W. The leg side gathers 80 are arranged inside the leg stretchable part 75 in the product width direction W. Leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be configured by a sheet material different from the side flap 70.

  The side flaps 70 are folded back toward the top sheet 50 at the inner end in the product width direction W, and two layers are laminated. An elastic member 71 (see FIG. 2) is provided between the two side flaps 70 in a state of being extended in the product longitudinal direction L. A leg side gather 80 is formed by the side flap 70 and the elastic member 71.

  The leg side gather 80 has a joining 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 product longitudinal direction L including the crotch region 25 is contracted in the product longitudinal direction L by the elastic member 71 to form a contracted portion 84. The leg side gather 80 rises with the joint portion 81 as a base end portion when worn, and the contraction portion 84 of the free end portion 82 contacts the wearer's skin as an 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 L 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, a joining portion 81 where the side flap 70 and the top sheet 50 (or the back sheet 60a or the like) are joined in the leg side gather 80 is shown by hatching (see FIG. 1).

  A plurality of joining portions 81 are provided, the first joining portion 81A is disposed outside the contracting portion 84 in the product longitudinal direction L, and the second joining portion 81B is located more than the contracting portion 84 in the product width direction W. Arranged outside. Therefore, the leg side gathers 80 are configured such that the center portion in the product longitudinal direction L including the crotch region 25 rises toward the wearer.

  Of the joint portions 81 of the leg side gathers 80, the first joint portion 81 </ b> A disposed outside the contraction portion 84 in the product longitudinal direction L is joined to the top sheet 50.

  Among the joint portions 81 of the leg side gathers 80, the second joint portion 81 </ b> B disposed outside the contraction portion 84 in the product width direction W is the crotch stretch portion 200 and the leg stretch portion 75 in the product width direction W. It is arranged between. The second joining portion 81B is joined to the back sheet 60a (and the exterior sheet 60 in part) with the entire length in the product longitudinal direction L. In addition, the back sheet 60a is arrange | positioned 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. For example, the joining portion 81 may be a portion that extends from the crotch region 25 to the front waistline region 20 and the back waistline region 30 in the product longitudinal direction L and is joined to the top sheet 50, or is absorbent in the product width direction W. It may be a portion joined to the back sheet 60a or the exterior sheet 60 outside the core 40a, and is configured to be an upright base end.

  In addition, the leg side gather 80 may be an upright gather that is disposed on the inner side of the leg stretchable part 75 in the product width direction W, and is not limited to the above-described configuration, and has a conventionally known leg side gather configuration. Of course, it can be adopted.

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

  In the first embodiment, the waist elastic part 85 is constituted by an elastic sheet. The member constituting the waist elastic part 85 is not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width entering rate. By configuring the waist stretchable portion 85 with a material having low bending rigidity, the waist stretchable portion 85 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 shrinkage of the disposable diaper 10 in the product longitudinal direction L when the disposable diaper extends in the product width direction W is suppressed, and the waist circumference of the wearer The disposable diaper 10 can be prevented from being pulled down to the crotch side.

In the first 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 to 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 first 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 from the absorbent core 40a in the product longitudinal direction L, the waist stretchable portion 85 is between the core wrap 40b and the back sheet 60a (or the exterior sheet 60). It may be arranged. The position of the waist elastic part 85 is not particularly limited. Moreover, in the area | region where the absorber 40 is not arrange | positioned, you may arrange | position between the side flap 70 and the back seat | sheet 60a (or exterior sheet | seat 60).

  The waist stretchable portion according to the first embodiment is configured to be stretched in the product width direction W, but the waist stretchable portion 85 is configured to be stretched in the product width direction W and the product longitudinal direction L. May be.

<Notch of absorber>
The basis weight of the part provided in the rear waistline region 30 of the absorber 40 is lower than the basis weight of parts provided outside the rear waistline region 30. Or the absorber 40 has the notch 110 for forming the low rigidity area | region in which the absorptive core 40a does not exist. The notch 110 is formed at the center of the rear end of the absorber 40 in the product width direction W. The width of the notch 110 in the product width direction W has a wedge shape that gradually decreases toward the front side. Further, the boundary between the absorbent core 40a and the notch 110 is formed as an arc that is convex toward the center in the product width direction W. The absorbent body 40 outside the notch 110 in the product width direction W has a trapezoidal shape that is convex 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 first embodiment, the waist stretchable portion 85 is disposed so as to overlap a part of the notch 110, but the waist stretchable portion 85 may be disposed so as to overlap the notch 110. .

  By forming such a notch 110, expansion and contraction of the waist stretchable portion 85 is not hindered, and even when the waist stretchable portion 85 contracts, the notch 110 narrows and the notch in the product width direction W is notched. Since the interval between the absorbers outside 110 is narrowed, the absorber 40 is unlikely to rise in an unintended shape. Note that the cutout 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 outside the notch 110 is narrowed in the product width direction W, the rear waist region of the notch 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 waist area 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 elastic part 85 and the wedge-shaped notch 110 that can be expanded and contracted in the product width direction W, 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. .

  Further, in the first embodiment, the notch 110 does not have the absorbent core 40a, and the waist stretchable portion 85 exists so as to overlap with the notch 110. Therefore, the rear waistline region 30 side in the product longitudinal direction L is present. The portion closer to the end of the core 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 can be formed more stably. .

  In 1st Embodiment, since the waist extension-contraction part 85 exists beyond the side edge in the product width direction W of the absorptive core 40a, while forming the disposable diaper 10 in a cup shape, the back waistline in the product longitudinal direction L About the absorptive core 40a of a position from the edge part side by the side of the area | region 30, it can be made to follow a wearer's body positively. Furthermore, at least a part of the waist elastic part 85 and the notch 110 exists in a region extending along the product width direction W from the pair of fastening tapes 90. Therefore, even when the disposable diaper 10 is worn while the disposable diaper 10 is 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 waistline stretchable portion 85 extends, and it becomes easier to position the body more reliably than the cup-shaped waist side.

  In 1st Embodiment, the absorptive core 40a outside the notch 110 in the product width direction W is convex toward the rear waistline region. For this reason, in addition to facilitating the formation of a cup shape in which the disposable diaper 10 swells on the non-skin surface side as described above, the surface area of the absorbent core 40a is maintained, so excretion from the end of the absorbent core 40a It can prevent leakage of things.

  In the first embodiment, the notch 110 has a wedge shape, and the boundary between the absorbent core 40 a 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 non-linearly toward the rear side in the product longitudinal direction L, and the rise of the rear waistline region 30 becomes more remarkable, so that the cup shape is more stable. Easy to form. Further, since the boundary between the absorbent core 40a and the cutout 110 is an arc that protrudes toward the crotch region 25, the rear waistline region 30 becomes a rounded cup shape due to the shrinkage of the cutout 110, and the wearer The shape is easy to follow along the rounded buttocks.

  In addition, since the notch 110 is formed, the rear end portion of the absorber 40 has a convex shape on the rear side outside the notch 110 in the product width direction W. Since the shape of the absorbent body 40 is reminiscent of placing a butt, the user can easily adjust the diaper to the correct position for the wearer.

<Bending stiffness of absorber>
The bending stiffness in the first 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 score coincides with the center score of the pendulum, 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) × 9.8 × 1 × 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.

<Fastening tape and target configuration>
The fastening tape 90 is attached to the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 includes a base sheet 91 connected to the side flaps 70, and an engagement hook (not shown) as a plurality of engaging members, and a hook sheet 92 fixed to the base sheet 91. Prepare. The hook sheet 92 is a part provided with an engaging member, and the above-described waistline holding portion is a part extending from the hook sheet 92 along 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 fastening tape 90 does not have an unnecessarily high rigidity. 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, the nonwoven fabric manufactured by manufacturing methods, such as a spun bond (SB) or a spun bond-melt blown-spun bond (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 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 engagement 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.

  For 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 the non-woven fabric surface from fluffing may be used.

  Further, the exterior sheet 60 of the disposable diaper is formed of a non-woven fabric, and a pattern 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 pattern sheet is printed on the back sheet. It can also be set as a target part by arrange | positioning to the non-skin contact side of 60a or the exterior sheet 60. FIG.

(2) Leg stretchable part Below, the leg stretchable part 75 is demonstrated.

  The leg stretchable part 75 is disposed along the leg opening 35 provided outside the absorber 40 in the product width direction W, and is configured to be stretchable in the product longitudinal direction L. The leg expansion / contraction part 75 has the width direction inner end part 75I in which the position in the product width direction W is located on the innermost side in the crotch region 25. The leg opening 35 and the leg stretchable part 75 extend toward the outer side in the product width direction W from the crotch region 25 toward the outer side in the product longitudinal direction L, particularly in the rear waistline region. In addition, the width direction inner end portion 75I of the leg stretchable part 75 may be arranged continuously in the product longitudinal direction L or may not be continued in the product longitudinal direction L. In the first embodiment, the position where the position of the leg opening 35 in the product width direction W is located on the innermost side in the crotch region 25 coincides with the width direction inner end portion 75I of the leg stretchable part 75, but not necessarily It does not have to match.

  The leg expansion / contraction part 75 of 1st 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-extensible sheet that has been cut or weakened can be used.

  Moreover, you may comprise the leg expansion-contraction part 75 by arrange | positioning one or more thread-like / strip-like elastic members which consist of a polyurethane elastic fiber or natural rubber instead of this elastic sheet.

  The leg stretchable part 75 is disposed between the side flap 70 and the exterior sheet 60. Or the leg expansion-contraction part 75 is arrange | positioned between the back sheet 60a and the side flap 70 in the site | part with which the back sheet 60a arrange | positioned between the absorber 40 and the exterior sheet 60 is provided.

  The stretchable sheet constituting the leg stretchable portion 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 most 45 mm, more preferably at least 12.5 mm and not more than 35 mm, at least in the crotch region 25. Preferably there is. 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 partial tightening does not concentrate by being substantially along 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 W, the region along the leg circumference becomes too wide, and the elastic sheet is easily wound around the wearer's body or turned up.

  The stretch rate of the leg stretchable part 75 is preferably 1.5 to 2.2 times. In the first embodiment, the extension rate 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 interval between the inner ends of the pair of left and right leg stretchable portions 75 in the product width direction W becomes wider as it goes from the crotch region 25 to the front waistline region 20, and as it goes from the crotch region 25 to the rear waistline region 30. And become wider. When wearing a diaper on the wearer's body, it is possible to make the leg stretchable part more in line with the body line by placing the leg stretchable part in a shape that is narrow in the crotch region 25 and widens toward the front and rear waistline The leg stretchable part is suitably extended around the 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. In addition, the said space | interval is the inner end in the product width direction W of a pair of left-right leg expansion-contraction part 75, after expanding and holding the disposable diaper 10 in the product longitudinal direction L and the product width direction W in the state which is not wrinkled from a natural state. The distance between them is measured.

  The elongation of the skin surface of the wearer's body is particularly large at the buttocks, and is prominent at a position closer to the outside in the product width direction W. Moreover, the leg expansion-contraction part 75 is closely_contact | adhered to a wearer's body. Therefore, by setting D2> D1, even when the wearer's movement 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 product longitudinal direction L toward the product width direction W, the leg opening and the leg along the wearer's leg roll. Since the stretchable part 75 can be arranged and local stress concentration can be suppressed, it can be in close contact with the wearer at a relatively low elongation rate, and the burden on the skin can be reduced.

  The leg expansion / contraction part 75 is comprised so that a disposable diaper may be curved along a wearer's leg periphery and it may shrink | contract. The ends of the leg stretchable parts 75 in the product longitudinal direction L are arranged so as to spread in the product width direction W, and are arranged in the vicinity of the waistline 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 product width direction W with a trunk periphery holding part.

(3) Shape of Crotch Stretchable Part Hereinafter, the shape of the crotch stretchable part 200 will be described. The crotch expansion / contraction part 200 is configured to maintain a flat shape in a part of the crotch region 25 of the wearer when the disposable diaper 10 is worn rather than the other part of the absorber 40. The crotch stretchable part 200 is configured to be stretchable at least in the product longitudinal direction L or the product width direction W.

  In the first embodiment, in the product longitudinal direction L, the length of the crotch stretchable part 200 is the same as the length of the crotch region 25. Therefore, in the product longitudinal direction L, the length of the front waistline region 20 is the length from the front end of the crotch stretchable part 200 to the front end of the front waistline 20. Similarly, in the product longitudinal direction L, the length of the rear waistline region 30 is the length from the rear end portion of the crotch stretchable portion 200 to the rear end portion of the rear waistline region 30.

In the first embodiment, the crotch stretch unit 200 is formed astride a virtual product centerline VL _T. Virtual product center line VL _T passes through the center C _T of the disposable diaper 10 in the product longitudinal direction L, and a virtual line extending along the product width direction W.

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

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

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

In such a case, ± = [[L _H −Af (t−1) / t] − [L _H −Ab (t−1) / t]} × 1/2 × t from a position satisfying the relationship A fold line FL is preferably formed within the range of P. In the state where the disposable diaper 10 is folded in two by forming the double fold line FL at a position satisfying the above-described relationship, the height of the rear end portion of the rear waistline region 30 and the front side of the front waistline region 20 The height of the end is aligned.

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

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

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

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

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

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

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

  Here, at the position overlapping with the double fold line FL, the width of the crotch stretchable part 200 in the product width direction W is ½ or more of the width of the absorbent core 40a in the product width direction W.

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

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

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

  Thus, in the first embodiment, the width of the crotch expansion / contraction part 200 in the product width direction W is ½ or more of the width of the absorbent core 40a in the product width direction W at the position overlapping the double fold line FL. . Accordingly, the crotch expansion / contraction part 200 contracts a certain width or more of the portion where the absorbent core 40a is disposed, so that the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body. By realizing such lifting of the absorbent core 40a at a position overlapping with the double fold line FL, the gap between the disposable diaper 10 and the wearer can be reduced. When the width of the crotch stretchable part 200 in the product width direction W is 80% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W at the position overlapping the double fold line FL, the disposable diaper 10 And the gap between the wearer and the wearer can be further reduced.

  Furthermore, if the width of the crotch stretchable part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a described above. On the other hand, if the width of the crotch expansion / contraction part 200 is too wide compared to the width of the absorbent core 40a, the part where the absorbent core 40a is not disposed contracts, and the outside of the crotch expansion / contraction part 200 in the product width direction W is contracted. The rigidity of the part increases. Accordingly, the crotch stretchable part 200 is easily caught on the wearer's thigh. Moreover, when the crotch expansion / contraction part 200 is provided in the site | part in which the absorptive core 40a is not arrange | positioned, the site | part in which the absorptive core 40a is not arranged than the site | part in which the absorptive core 40a is arrange | positioned. The disposable diaper 10 is mounted in a contracted state. As a result, the members constituting the portion where the absorbent core 40a is not disposed overlap each other, the crotch stretchable portion 200 becomes hard, and the comfort of the disposable diaper 10 is impaired.

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

The narrowest part width of the absorbent core 40a in the product widthwise direction W is is preferably provided in 10~60mm front with respect to the virtual product centerline VL _T. Preferably, the width is the narrowest portion of the absorbent core 40a in the product width direction W is provided 20~40mm front with respect to the virtual product centerline VL _T. It is preferable that the crotch stretchable part 200 is formed so as to straddle a portion where the width of the absorbent core 40a is the narrowest in the product width direction W.

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

  The absorbent core 40 a located in the front waistline region 20 and the rear waistline region 30 located outside the crotch stretchable part 200 in the product longitudinal direction L is not contracted by the crotch stretchable part 200. Therefore, the crotch stretchable part 200 maintained in a flat shape in the crotch region 25 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, The crotch expansion / contraction part 200 is appropriately disposed along the body.

  In addition, when the crotch stretchable part 200 is stretchable along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are easily raised due to the shrinkage of the crotch stretchable part 200. A flat crotch region 25 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 region 25 of the wearer by the contraction of the crotch stretchable part 200.

  The crotch stretchable part 200 is preferably constituted by 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 the crotch region 25 of the disposable diaper 10 together with the absorbent core 40a is the wearer's body. The gap between the disposable diaper 10 and the wearer can be suppressed. In addition, an elastic sheet can be comprised with the elastic sheet similar to the leg expansion-contraction 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 / strip-like elastic members made of polyurethane elastic fiber or natural rubber. In this case, in order to uniformly shrink the absorbent core 40a by the crotch stretchable portion 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 for the difference of the space | interval of an adjacent elastic member to be 2 mm or less.

Specifically, the expansion rate of the crotch stretchable part 200 is preferably 1.2 times or more and 1.8 times or less. In the first 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 the expansion / contraction direction (product longitudinal direction L in the first embodiment). The degree of expansion of the crotch expansion / contraction part 200 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.

  1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package, and it is 60 in the atmosphere of 20 degreeC +/- 2 degreeC and relative humidity 60% +/- 5% RH in the state. Leave for a minute and measure the length of the crotch stretch along the stretch direction. This length is defined as “the length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the natural state”.

  Second, the length in the stretch direction of the desired region in such a state (ie, the natural state), and the length in the stretch direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness. This length is defined as “the length in the expansion / contraction direction of the crotch expansion / contraction part 200 in the maximum extension 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, when the expansion rate of the crotch expansion / contraction part 200 is 1.2 times or less, the crotch expansion / contraction part 200 is not sufficiently contracted in the natural state, and the disposable diaper 10 is compared with the case where the crotch expansion / contraction part 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 stretchable part 200 is larger than 1.8 times, the shrinkage dimension in the shrinking direction of the crotch stretchable part 200 becomes too large, so that the region where the crotch stretchable 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).

  When this inventor makes the shrinkage | contraction amount in the product longitudinal direction L of the crotch expansion-contraction part 200 to 2-8% of the length in the product longitudinal direction L of the disposable diaper 10, the process of mounting | wearing the wearer with the disposable diaper 10 with respect to a wearer. In the above, it was confirmed that the crotch stretchable part 200 is preferably 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 length of the disposable diaper 10 in the product longitudinal direction L is insufficient. It becomes difficult to attach the diaper 10 to the wearer's body, or the disposable diaper 10 and the wearer's body are in close contact with each other in the crotch region 25 and are likely to be displaced.

  On the other hand, if the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is smaller than 2%, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 close to the wearer's body is hardly exhibited.

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

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

  In the first embodiment, the absorber 40 is formed with a first inflection portion 41 and a second inflection portion 42. The first inflection part 41 and the second inflection part 42 extend along the product width direction W. The second inflection part 42 is located behind the first inflection part 41. The first inflection part 41 and the second inflection part 42 serve as a bending base point of the disposable diaper 10.

  The part sandwiched between the first inflection part 41 and the second inflection part 42 is provided with a crotch expansion / contraction part 200 configured to maintain a flat shape more easily than other parts of the absorber 40. The first inflection part 41 and the second inflection part 42 are formed by a difference in rigidity between a part contracted by the crotch expansion / contraction part 200 and a part other than the part to be contracted. As a result, a flat “bottom” is formed in the disposable diaper 10.

  In the first embodiment, a notch 115 (notch 125) is formed in the vicinity of the first inflection part 41 (second inflection part 42). The notch 115 is formed in a region corresponding to the first inflection portion 41. Similarly, the notch 125 is formed in a region corresponding to the second inflection part 42. The notch 115 and the notch 125 are regions where the absorbent core 40 a constituting the absorber 40 is not present. In 1st Embodiment, the notch 115 and the notch 125 correspond to the low-rigidity part whose fabric weight of the absorptive core 40a is lower than the other part of the absorptive 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 are formed to make the first inflection part 41 and the second inflection part 42 in a better state. In the first embodiment, the notch 115 and the notch 125 exist along the edge in the product longitudinal direction L of the crotch stretchable part 200. Even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 and the absorbent core 40a located in the crotch region 25 are completely separated. It is preferable that it is continuous without being generated.

  The lengths in the product longitudinal direction L of the notch 115 and the notch 125 become wider as going outward in the product width direction W. With such a shape, the outer side of the rear waist region 30 of the absorbent core 40a is more easily contracted, so that a flat “bottom” is formed on the disposable diaper 10. Further, 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” and rise to the wearer's body. It becomes easy to curve along the roundness of (abdomen and buttocks).

  An edge 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.

  The crotch expansion / contraction part 200 is provided independently from the front waistline area 20, the rear waistline area 30, and the fastening tape 90 that constitute the waistline holding part.

(4) Shape of disposable diaper in product longitudinal direction Hereinafter, the shape of the disposable diaper 10 in the product longitudinal direction L will be described. In the following, it should be noted that the length in the natural state, that is, the contracted state will be described.

In the product longitudinal direction L, the length L _R of the back waistline region 30 is longer than the length L _F of the front waistline region 20. Specifically, the length _{L R} of the back waistline region 30 is preferably equal to or less than 1.6 times 1.1 times the length _{L F} of the front waistline region 20. Preferably, the length _{L R} of the back waistline region 30 is 1.5 times or less than 1.2 times the length _{L F} of the front waistline region 20.

Here, the length L _R of the back waistline region 30 exceeds 1.6 times the length L _F of the front waistline region 20, out of balance between the dorsal and ventral side of the disposable diaper 10, crotch of the wearer When the crotch stretchable part 200 is placed along the area, the front waistline area 20 is excessively in close contact with the wearer, or the back waistline area 30 jumps out of the wearer. Thereby, the clearance gap produced between the disposable diaper 10 and a wearer arises.

In detail, as a shape of the wearer's body, generally, the buttocks protrude more than the lower abdomen. When placed along the crotch stretch unit 200 in the crotch region of the wearer, by setting the aforementioned range of the ratio of the length L _F of the length L _R and the front waistline region 20 of the back waistline region 30, wear The shape of the disposable diaper 10 suitable for the shape of the person's body is realized.

  That is, the protrusion of the disposable diaper 10 due to insufficient dimensions and the generation of unnecessary gaps between the disposable diaper 10 and the wearer's body due to excessive dimensions are suppressed.

In particular, for infants before or after the start of walking, it is preferable to take a posture in which the body is curled toward the ventral side. In such a position, by setting tends to condition the skin extending the hip side, the ratio of the length L _F of the length L _R and the front waistline region 20 of the back waistline region 30 on the above-mentioned range, The shape of the disposable diaper 10 suitable for the infant's body is realized.

For example, in the extended state, the total length _{L T} of the disposable diaper 10 in the product longitudinal direction L (i.e., 2L _H) when it is 400 mm, length before _{L F} of the waistline region 20 is 130 mm, the crotch stretch unit 200 the length _{L C} is 80 mm, it is preferred length _{L R} of the back waistline region 30 is 190 mm.

According to such dimensions, the length L _R of the back waistline region 30 is about 1.46 times the length L _F of the front waistline region 20. Thereby, it is possible to wear the disposable diaper 10 along the wearer's body as the entire disposable diaper 10 in the product longitudinal direction L as well as the crotch stretchable part 200.

(5) Manufacturing method of disposable diaper An example of the manufacturing method of the absorbent article which concerns on 1st Embodiment is demonstrated. In addition, about the method which is not demonstrated in 1st Embodiment, the existing method can be used. 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, a cutting step, and a fold line forming step.

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

  In the component mounting step, on the web constituting the back sheet, the elastic sheet constituting the crotch stretchable part 200, the stretchable sheet constituting the leg stretchable part 75, the other web such as the web constituting the top sheet, Components constituting the disposable diaper 10 such as a leak-proof sheet and an absorber are placed.

  For example, the stretchable sheet constituting the crotch stretchable part 200 is conveyed in a non-stretched state, and the stretchable sheet is stretched due to a difference in rotational speed between two rotating rolls. Preferably, the stretchable sheet is stretched twice or more. Subsequently, the stretchable sheet is stretched to a desired magnification by the speed difference between the belt conveyor that conveys the stretchable sheet and the intermittent drum. Cut stretchable sheets into individual product lengths on an 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 crotch expansion / contraction part 200 can be arranged.

  Further, the stretchable sheet constituting the leg stretchable part 75 is extended, further transferred to the intermittent drum while being displaced in the product width direction W, and the stretchable sheet is 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 part 75 can be arranged in a curved shape.

  In the leg periphery forming step, the top sheet 50 exterior sheet 60 and the back sheet 60 a are cut along the end of the leg stretchable part 75 in the product width direction W. Thereby, the leg periphery 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.

In the fold line forming step, the fold line FL is formed by applying a line-shaped pressure along the product width direction W to the disposable diaper 10 from the skin surface side toward the non-skin surface side. Specifically, the double fold line FL is, as described above, X = {[L _H −Af (t−1) / t] − [L _H −Ab (t−1) / t]} × 1/2. It is preferably formed within a range of ± P from a position satisfying the relationship of xt.

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  Specifically, in the first modification, the thickness of the rear waistline region 30 varies depending on the part. FIG. 4 is a diagram illustrating a state in which the disposable diaper 10 is folded into two with respect to the double fold line FL. In detail, FIG. 4 has shown the cross section of the disposable diaper 10 along the F3-F3 line | wire shown in FIG.

  As shown in FIG. 4, the rear waistline region 30 has a facing part 30 </ b> X and the other part 30 </ b> Y that face the crotch stretchable part 200. The other part 30Y is a part that is continuous to the facing part 30X and has a substantially constant thickness.

  The thickness of the facing part 30X is thinner than the thickness of the other part 30Y. Thereby, since the thickness increased by the crotch stretchable part 200 is relieved by the facing portion 30X, even if a plurality of disposable diapers 10 are stacked, the increase in thickness accompanying the formation of the crotch stretchable part 200 can be relieved as a whole. .

  It should be noted that the height of the rear end of the rear waistline region 30 and the height of the front end of the front waistline region 20 are uniform as shown in FIG.

<Measurement of thickness>
The thickness of the target part (for example, the rear waistline region 30) can be measured as follows. Specifically, the thickness of the target site was measured using a PEACOCK dial thickness gauge manufactured by Ozaki Mfg. Co., Ltd. in a state where a load of 2.5 gf / cm ² was applied to the target site in a 10 mm diameter circle. Moreover, such a measurement of thickness is performed in the state which extended | stretched the disposable diaper from the natural state to the state by which the wrinkles by an elastic member cannot be visually confirmed on a non-stretch sheet | seat.

[Modification 2]
Hereinafter, Modification Example 2 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  Specifically, in 1st Embodiment, the leg expansion-contraction part 75 is comprised by the elastic sheet. In other words, in 1st Embodiment, the leg expansion-contraction part 75 is comprised by the strip | belt-shaped elastic member. On the other hand, in the second modification, the leg stretchable part 75 is configured by a thread-like elastic member as shown in FIG.

  L ... Product longitudinal direction, W ... Product width direction, 10 ... Disposable diaper, 20 ... Front waistline region, 25 ... Inseam region, 30 ... Rear waistline region, 35 ... Opening around leg, 40 ... Absorber, 40a ... Absorbent Core, 40b ... Core wrap, 41 ... First inflection part, 42 ... Second inflection part, 50 ... Top sheet, 60 ... Exterior sheet, 60a ... Back sheet, 70 ... Side flap, 71 ... Elastic member, 75 ... Leg Expansion / contraction part, 75I ... width direction inner end part, 80 ... leg side gather, 81 ... joining part, 81A ... first joining part, 81B ... second joining part, 82 ... free end part, 84 ... contraction part, 85 ... waist Rotating elastic part, 90 ... Fastening tape, 91 ... Base sheet, 92 ... Hook sheet, 95 ... Target part, 110 ... Notch, 115 ... Notch, 125 ... Notch, 200 ... Crotch elastic part

Claims (8)

A front waistline region, a back waistline region, a crotch region located between the front waistline region and the back waistline region, a product longitudinal direction from the front waistline region toward the back waistline region, and the product longitudinal direction A disposable diaper having a product width direction orthogonal to the direction,
An absorbent body straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region;
It is formed at a position overlapping the absorber in the crotch region, and includes a crotch stretchable part having stretchability,
The crotch stretchable part is formed in a stretched state of the disposable diaper, straddling a virtual product center line extending along the product width direction through the center of the disposable diaper in the product longitudinal direction, and In the natural state of the disposable diaper, a fold line extending along the product width direction and the inseam so that the height of the front end of the front waistline region and the height of the rear end of the rear waistline are aligned Overlap in the area,
When the disposable diaper is in an extended state, a virtual crotch center line that passes through the center of the crotch stretchable part in the product longitudinal direction and extends along the product width direction is provided in front of the virtual product center line. The disposable diaper is characterized in that the double fold line is provided behind the virtual product center line in the product longitudinal direction. The absorber has an absorbent core composed of an absorbent polymer and predetermined fibers,
The absorbent core has an overlapping part overlapping the crotch stretchable part, a front part provided in front of the overlapping part, and a rear part provided in rear of the overlapping part. ,
In the product width direction, the width of the overlapping portion of the absorbent core is smaller than the width of the front portion and the width of the rear portion,
The width of the crotch expansion / contraction part in the product width direction is a half or more of the width of the absorbent core in the product width direction at a position overlapping with the double fold line. Disposable diapers.   The shrinkage amount of the crotch stretchable part in the product longitudinal direction is 2% or more and 8% or less with respect to the total length of the disposable diaper in the product longitudinal direction. Disposable diapers. The rear waistline region has a facing part and other parts facing the crotch stretchable part in a state where the disposable diaper is folded in two with the folding line as a base point,
The disposable diaper according to claim 1, wherein a thickness of the facing part is thinner than a thickness of the other part.   The length of the rear waistline region in the product longitudinal direction is 1.1 times or more and 1.6 times or less of the front waistline region in the product longitudinal direction. Disposable diapers.   The length of the rear waistline region in the product longitudinal direction is 1.2 times or more and 1.5 times or less of the front waistline region in the product longitudinal direction. Disposable diapers.   2. The disposable diaper according to claim 1, wherein the disposable diaper is enclosed in a package in a state where the disposable diaper is folded in two with respect to the folding line. When the disposable diaper is in an extended state, in the product longitudinal direction, the length from the virtual product center line to the end of the rear waistline region is represented by LH, and the crotch expansion and contraction from the virtual product center line The length from the virtual product center line to the rear end of the crotch expansion / contraction part is represented by Ab and is folded in half from the virtual product center line. The length to the line is represented by X,
The elongation ratio of the crotch stretchable part is represented by t,
The product thickness of the portion overlapping the half-fold line is represented by P,
The fold line is ± P from a position satisfying a relationship of X = {[LH-Af (t-1) / t]-[LH-Ab (t-1) / t]} × 1/2 × t. The disposable diaper according to claim 1, wherein the disposable diaper is provided within a range.

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