JP5904863B2 - Disposable diaper and method for manufacturing disposable diaper - Google Patents

Description

  The present invention relates to a disposable diaper and a method for manufacturing a disposable diaper.

  Conventionally, it has a front waistline region, a rear waistline region, and a crotch region, and has a pair of leg-hole openings, and has an absorbent body that straddles the crotch region and extends to the front waistline region and the back waistline region. There is known a disposable diaper in which a leg stretchable part that stretches and contracts is arranged along the leg opening.

  The leg stretchable part of the disposable diaper of Patent Document 1 is formed of a stretchable material such as rubber or an elastomer material, or a web constituent material such as a composite web such as a stretchable film or a stretchable nonwoven fabric. This web component has a predetermined length in the product width direction and can be stretched throughout. Therefore, the leg periphery opening part of a disposable diaper is arrange | positioned in planar shape along a wearer's leg periphery.

JP-T-2004-505725 (FIGS. 4 and 7, paragraphs 0012 and 0017)

However, the disposable diaper described above has the following problems.
The leg stretchable part is composed of a non-stretchable sheet material (a sheet material constituting a top sheet or a backsheet) and a stretchable web constituent material, and a non-stretchable sheet by contraction of the web constituent material. The material also shrinks. Therefore, wrinkles are formed on the non-stretchable sheet material, and irritation to the skin may occur.

  Moreover, since the leg expansion-contraction part of patent document 1 is comprised by the web structural material which has predetermined length in a product width direction, compared with the leg expansion-contraction part comprised by the thread-like elastic member, it has a larger area. Shrink non-stretchable sheet material. Therefore, the wrinkle formed on the non-stretchable sheet material is larger than that of the thread-like elastic member, and the wrinkle is increased, which may increase the irritation to the wearer's skin.

  Then, this invention is made | formed in view of the above-mentioned subject, The manufacture of the disposable diaper and disposable diaper which can be arrange | positioned planarly along a wearer's leg periphery, and can suppress irritation | stimulation to skin. It aims to provide a method.

  A disposable diaper according to the present disclosure (disposable diaper 10) is located between a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and the front waistline region and the rear waistline region. A product longitudinal direction (product longitudinal direction L) from the front waistline region to the rear waistline region, and a product width direction (product width direction W) orthogonal to the product longitudinal direction. An absorber (absorbent body 40) extending across the crotch region and extending from the crotch region toward at least one of the front waistline region and the rear waistline region, and the product width direction than the absorber A disposable diaper that is disposed along a leg opening provided on the outside and includes a leg stretchable part (leg stretchable part 75) that is stretchable along the longitudinal direction of the product. The leg elastic part is the crotch Extends toward the outside in the product width direction from the outside in the product longitudinal direction, and the leg stretchable portion is a belt-like first leg stretchable material (first leg stretchable material having a predetermined length in the product width direction) 76), and a second leg stretchable material that is arranged in the first stretchable material placement region where the first leg stretchable material is placed and is shorter in the product width direction than the first leg stretchable material (Second leg stretchable material 77), and on the skin contact surface side of the first leg stretchable material and the second leg stretchable material, the first leg stretchable material and / or the second leg stretchable material. A non-stretchable sheet material (side flap 70) joined to the material is provided, and the elongation ratio of the second leg stretchable material in the product longitudinal direction is the product longitudinal direction of the first leg stretchable material. The gist is that it is higher than the elongation rate.

  Moreover, the manufacturing method of the disposable diaper which concerns on this indication is the 1st which comprises the leg expansion-contraction part arrange | positioned along a leg periphery opening part on the web conveyed in the state in which the component which comprises a disposable diaper was continuous. It is a manufacturing method of an absorptive article which attaches a leg elastic material and the 2nd leg elastic material, Comprising: The conveyance which conveys the continuous belt-like 1st leg elastic material and the continuous thread-like 2nd leg elastic material separately A stretching step of stretching the first leg stretchable material and the second leg stretchable material in the transport direction in a state where the first leg stretchable material and the second leg stretchable material are merged with each other; A swinging process of transporting the first leg stretchable material and the second leg stretchable material while displacing them in a crossing direction perpendicular to the transport direction, and cutting the first leg stretchable material and the second leg stretchable material by a product length. Cut off A step of attaching the cut first leg elastic material and the second leg elastic material to the web, and the conveying step extends the two leg elastic material in the conveying direction, And it makes it a summary to convey a said 1st leg elastic material and a 2nd leg elastic material in the state whose elongation rate of a said 2nd leg elastic material is higher than the elongation rate of a said 1st leg elastic material.

  According to the disposable diaper which concerns on this indication, the manufacturing method of the disposable diaper which can be arrange | positioned planarly along a wearer's leg periphery, and can suppress irritation | stimulation to skin can be provided.

It is an expanded top view of the disposable diaper concerning this embodiment. 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 a figure which shows the state which mounted | wore the wearer with the disposable diaper which concerns on this embodiment. It is a side view which shows the manufacturing apparatus of the absorbent article which concerns on embodiment.

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

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

(1) Whole schematic structure of disposable diaper FIG.1 and FIG.2 is an expansion | deployment top view of the disposable diaper 10 which concerns on this embodiment. FIG. 3 is a cross-sectional view of the disposable diaper 10 taken along the line F1-F1 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. The disposable diaper 10 is formed with a pair of leg-hole openings 35 (see FIG. 4). 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 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.

  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 20 is a range extending in the width direction from the region where the engaging portion of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 30 is a range extending in the width direction from the region where the target portion 95 is provided.

  The disposable diaper 10 includes a crotch stretchable part 200a formed in the crotch region 25 and stretchable in the product longitudinal direction L. Specifically, the crotch expansion / contraction portion 200a is disposed in the crotch portion 200 formed in the crotch region 25. The configurations of the crotch unit 200 and the crotch expansion / contraction unit 200a will be described in detail later.

  The surface side (top sheet 50 side) of the absorber 40 is provided around a leg opening 35 and is provided with a pair of leg stretchable parts 75 that can be stretched in the product longitudinal direction L.

  The leg stretchable part 75 is longer than the crotch stretchable part 200a in the product longitudinal direction L, and is provided outside the crotch stretchable part 200a in the product width direction W. The configuration of the leg expansion / contraction part 75 will be described in detail later.

  A pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). The leg side gathers 80 are provided at the inner end in the product width direction of the side flaps 70, and are stand-up stretchable gathers that are arranged on the inner side in the product width direction than the leg stretchable parts. The leg side gathers 80 are arranged on the inner side in the product width direction with respect to the leg stretchable part 75 and function as a legside stretchable part.

  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. 3) 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 developed plan view of the disposable diaper shown in FIG. 1 is a state in which the elastic member 71 of the leg side gather 80 is contracted, and the developed plan view of the disposable diaper in FIG. Indicates the state.

  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 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 joint portions 81 of the leg side gathers 80, the second joint portion 81B disposed on the outer side in the product width direction with respect to the contraction portion 84 is between the crotch stretch portion 200a 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 over the entire length in the product longitudinal direction. The back sheet 60a is disposed between the absorber 40 and the exterior sheet 60, and functions as a leak-proof sheet.

  Of the joined portions 81 of the leg side gathers 80, the first joined portions 81A arranged on the outer side in the product longitudinal direction from the contracted portion 84 are joined to the top sheet 50.

  The joining portion 81 of the leg side gather 80 can employ various configurations. The joining portion may be, for example, a portion that extends from the crotch part to the front waistline region and the back waistline region in the product longitudinal direction and is joined to the top sheet, or liquid-impermeable on the outer side in the width direction than the absorbent core 40a. It may be a part joined to a conductive back sheet or exterior sheet, and is configured to be a standing base end part.

  Further, the leg side gathers only need to be an upright gather disposed on the inner side in the product width direction with respect to the leg stretchable part, and are not limited to the above configuration, and it is possible to adopt a conventionally known leg side gather configuration. It is.

  Further, between the pair of fastening tapes in the product width direction, a waist stretchable portion 85 that can be stretched in the product width direction is provided. The waist stretchable portion 85 is disposed between the pair of fastening tapes in a plan view and contracts between the fastening tapes in the width direction. The waist elastic part 85 is disposed on the surface of the top sheet on the skin contact side, and 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. 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 extension / contraction part is not particularly limited, but is preferably disposed closer to the non-skin contact surface than the absorber 40. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.

  The waist stretchable portion according to the present embodiment is configured to stretch in the product width direction, but the waist stretchable portion may be configured to stretch in the product width direction and the product longitudinal direction. Good.

(2) Leg stretchable part Next, the leg stretchable part 75 will be described in detail. The leg stretchable part 75 is arranged along the leg opening 35 provided on the outer side in the product width direction with respect to the absorbent body 40, and is configured to be stretchable along the product longitudinal direction L. The leg opening 35 and the leg expansion / contraction part 75 have a width direction inner end region 75I whose position in the width direction is located at the innermost side in the crotch region, and the product width from the crotch region 25 toward the product longitudinal direction outer side. It extends toward the outside in the direction. 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.

  The leg stretchable part 75 of the present embodiment includes a strip-shaped first leg stretchable material 76 having a predetermined length in the product width direction, and a thread-like second length that is shorter in the product width direction than the first leg stretchable material 76. Leg elastic members 77.

  The 1st leg elastic material 76 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 first leg stretchable member 76 may be configured by arranging a band-like elastic member made of polyurethane elastic fiber or natural rubber.

  The first leg elastic member 76 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in the region where the back sheet 60 a disposed between the absorber 40 and the exterior sheet 60 is provided, the first leg stretchable material 76 is disposed between the exterior sheet 60 a and the side flap 70.

  The stretchable sheet constituting the first leg stretchable material 76 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 that 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 first leg stretch member 76 is preferably 1.4 to 2.2 times. In the present embodiment, the elongation rate of the first leg stretch member 76 is set to 1.7 times. The elongation rate means the degree of elongation of the first leg stretch material 76 or the second leg stretch material 77 and is defined as follows.
Elongation rate of the first leg stretchable material = (length of the first leg stretchable material in the stretched state) ÷ (length of the first leg stretchable material in the natural state), or
Elongation rate of second leg stretchable material = (length of second leg stretchable material in stretched state) ÷ (length of second leg stretchable material 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 1st leg elastic material is cut out. At this time, the non-stretchable sheet joined to the first leg stretchable material is cut out. Furthermore, it cuts out along the 2nd leg elastic material in the 0.5-1.0mm position on the product width direction outer side of the 2nd leg elastic material. The elongation rate of the sample of only the first leg stretchable material after cutting is measured, and the elongation rate of the first leg stretchable material is measured. Moreover, the elongation rate of the sample containing the 2nd leg elastic material after cut out is measured, and the elongation rate of the 2nd leg elastic material 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 lengths of the first leg stretch material and the second leg stretch material are measured along the stretch direction. This length is defined as “the length of the first leg elastic material in the natural state” and “the length of the second leg elastic material 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 first leg stretchable material in the extended state” and “the length of the second leg stretchable material in the stretched state”.
Using these measurement results, the elongation percentage is measured by calculating with the above formula.

  Further, the distance between the inner ends in the product width direction W of the pair of left and right leg expansion / contraction portions 75 becomes wider from the crotch region 25 toward the front waistline region 20, and as the distance from the crotch region 25 toward the rear waistline region 30 increases. And become wider. When wearing a diaper on the wearer's body, it is possible to make the leg stretchable part follow the body line more by placing the leg stretchable part in a shape that narrows at the crotch and spreads toward the front and rear waistline, A leg expansion-contraction part will be suitably extendedly arranged around a wearer's leg.

  Further, the distance (D1 in the figure) at the end of the front waistline region 20 of the pair of left and right leg stretchable parts 75 is the distance (D2 in the figure) at the end of the rear waistline area 30 of the pair of left and right leg stretchable parts 75. Narrower than. The interval is defined as the inner end in the product width direction W of the pair of left and right leg stretchable parts 75 after the disposable diaper 10 is expanded and held in the product longitudinal direction L and the product width direction W in a state where there is no wrinkle from the natural state. The distance between them is measured.

  The elongation of the skin surface of the wearer's body is particularly large in the buttocks, and is prominent at positions closer to the outside in the width direction. Further, the leg stretchable part 75 is in close contact with the wearer's body. Therefore, by setting D2> D1, even when the movement of the wearer is applied to the disposable diaper 10, the leg stretchable part 75 on the buttock side can be stretched while being in close contact, and even if the amount of change in stretch is large, the leg The elastic part 75 does not stretch. Therefore, the displacement of the disposable diaper 10 by the leg expansion / contraction part 75 can be suppressed.

  The second leg stretchable material 77 is disposed in the first stretchable material placement region where the first leg stretchable material is placed, and is placed so as to overlap the first leg stretchable material 76. The second leg stretchable material is disposed along the inner end in the width direction of the first leg stretchable material 76.

  The second leg stretchable member 77 is composed of a thread-like elastic member. For example, an elastic member having a thickness of 340 to 940 dtex can be used. Further, the elongation rate of the second leg stretchable material 77 is configured to be higher than the stretch rate of the first leg stretchable material 76. Specifically, the elongation ratio of the second leg stretchable material 77 is preferably 1.7 to 2.5 times. In the present embodiment, the elongation rate of the second leg elastic member 77 is set to 2.2 times.

  The second leg stretch member 77 is disposed between the first leg stretch member 76 and the exterior sheet 60. In the case where the exterior sheet 60 is not provided, it may be disposed between the first leg stretchable material 76 and the back sheet 60a.

  Although the second leg stretchable material 77 of the present embodiment is disposed on the non-skin contact surface side of the first leg stretchable material 76, the second leg stretchable material 77 according to the present invention is the first leg stretchable material 77. The elastic member 76 may be disposed on the skin contact surface side. In the state where the second leg stretchable material 77 is disposed on the skin contact surface side of the first leg stretchable material 76, the side seat as the non-stretchable sheet material is the first leg stretchable material 76 and the second leg stretchable material. It is arranged on the skin contact surface side of 77.

  Moreover, the state arrange | positioned at the non-skin contact surface side of the 1st leg elastic material 76 is not only the state contact | abutted on the non-skin contact surface of the 1st leg elastic material 76, but the 1st leg elastic material 76. This is a concept including a state of being indirectly arranged with respect to the first leg stretchable material 76 on the non-skin contact surface side. Furthermore, the state of being arranged on the skin contact surface side of the first leg elastic member 76 is not only the state of contacting the skin contact surface of the first leg elastic member 76 but also the skin of the first leg elastic member 76. It is a concept that includes a state of being indirectly arranged with respect to the first leg stretchable material 76 on the contact surface side.

  However, when the second leg stretchable material is disposed on the skin contact surface side of the first leg stretchable material, the portion contracted by the second leg stretchable material is likely to hit the skin, and the skin may be strongly stimulated. Therefore, it is preferable to arrange the second leg stretchable material on the non-skin contact surface side of the first leg stretchable material, and according to this configuration, the portion contracted by the second leg stretchable material is prevented from directly hitting the skin. it can.

  Furthermore, the first leg elastic member 76 is disposed on the skin contact surface side, and the second leg elastic member 77 is disposed on the non-skin contact surface side. , Each other's joining pattern is joined in a discontinuous and intermittent joining pattern (for example, a coating pattern in which both the non-existing part of the adhesive and the existing part of the adhesive exist by spiral coating, etc.) On the other hand, the second leg stretchable material has a continuous bonding pattern (for example, slit coating on the thread rubber or bead coating in accordance with the thread rubber existing section). It is more preferable that it is joined by such a coating pattern.

  As a result, the texture on the skin contact surface side can be made more flexible, and the second leg elastic material on the non-skin contact surface side is continuously stretched with the sheet of the first leg elastic material while relaxing the irritation to the skin. Since it can join, the wrinkles which generate | occur | produce with a 2nd leg elastic material can also be made smaller, and the irritation | stimulation to skin can be eased.

  The leg stretchable portion 75 is a portion that substantially contracts in the longitudinal direction of the product due to 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.

  Drawing 4 is a figure showing typically the state where the disposable diaper concerning an embodiment was equipped, and it is the figure seen from the wearer's front. As shown in FIG. 4, the leg opening of the disposable diaper is arranged along the leg by the leg stretchable part 75. At this time, since the first leg stretchable material has a band shape, the leg opening 35 of the disposable diaper can be arranged in a plane around the wearer's leg.

  In addition, a thread-like second leg elastic member 77 having a shorter width than the first leg elastic member 76 is disposed, and the elongation rate of the second leg elastic member 77 is larger than the elongation rate of the first leg elastic member 76. Since it is high, the non-stretchable side flap 70 can be shrunk by the second leg stretchable material 77. However, since the first leg stretchable material 76 having a large contact area with the skin has a relatively low elongation rate, wrinkles in the entire leg stretchable portion 75 that is the first stretchable material placement region can be suppressed.

  By providing the first leg elastic material and the second leg elastic material together, the second leg elastic material 77 partially contracts the non-elastic side sheet, and wrinkles are generated in the entire leg elastic part 75. And the entire leg stretchable part 75 can be arranged in a planar shape around the leg of the wearer by the first leg stretchable material 76.

  Moreover, since the 2nd leg elastic material is arrange | positioned along the inner side edge part of the product width direction of a 1st leg elastic material, the product width direction of the 1st leg elastic material which is a location closely_contact | adhered to a wearer's leg periphery. It can suppress that the outer side edge part of this part adheres too much, and the irritation | stimulation to the skin by a leg periphery opening part can be reduced.

  Furthermore, in order to reduce irritation | stimulation to the skin of a leg periphery opening part, it is desirable for the 2nd leg elastic material to be arrange | positioned rather than the center of the 1st leg elastic material in the product width direction. Since the most contracting part of the leg stretchable part is located inward in the width direction from the center of the leg stretchable part 75 in the width direction, the inner end of the leg stretchable part 75 in the product width direction is the product width of the leg stretchable part 75. Shrinks more strongly than the outer edge of the direction.

  Since the part of the first leg stretchable material near the outer end in the product width direction is a part that is closer to the wearer's leg than the part near the inner end, the second leg is located near the inner end. By arrange | positioning an elastic material, it can suppress that the contact | abutting to the skin of a leg periphery opening part becomes strong.

  Thereby, the part of the width direction outer side from the 2nd leg elastic material 77 can fit a wearer from the 2nd leg elastic material 77 as a starting point. A state in which the leg stretchable part 75 can be more closely attached to the wearer's legs while maintaining the length (width) in the product width direction by widening the portion of the first leg stretchable material 76 that is closer to the outside in the product width direction. Therefore, the fit of the leg stretchable part 75 to the wearer can be enhanced.

  The inner end of the first leg stretchable material in the product width direction and the outer end of the first leg stretchable material in the product width direction are arranged in parallel, and the length of the first leg stretchable material in the product width direction. Is substantially constant. When the length of the first leg stretchable material in the product width direction is not constant, the contraction force on the wearer's leg is not constant, and stress may concentrate locally. However, since the length of the first leg stretchable material in the product width direction is constant, the leg stretchable portion 75 can be arranged so as to be in contact with the same region along the wearer's leg.

  The end of the second leg stretchable material in the product longitudinal direction may be arranged on the inner side in the product longitudinal direction of the end of the first leg stretchable material in the product longitudinal direction. The end of the first leg stretchable material in the product longitudinal direction and the end of the second leg stretchable material in the product longitudinal direction are portions that serve as a base point for shrinkage, and the thickness of the portion compared to the adjacent non-stretchable portion. Therefore, a gap may be formed between the wearer's legs when worn. Further, when the end of the first leg stretchable material in the product longitudinal direction and the end of the second leg stretchable material in the product longitudinal direction coincide with each other, the shrinkage of the portion becomes stronger, and the non-stretchable portion and the stretchable portion There is a possibility that the difference in thickness of the material becomes larger.

  In order to eliminate such inconveniences, it is desirable to displace the end portion of the first leg stretchable material in the product longitudinal direction and the end portion of the second leg stretchable material in the product longitudinal direction, and further, By disposing the second stretchable material having a high elongation rate on the inner side in the longitudinal direction, shrinkage can be made in stages, and wrinkles due to local shrinkage can be suppressed.

  A non-stretchable backsheet 60a and an exterior sheet 60 are laminated on the non-skin contact surface side of the leg stretchable portion. The outer end of the outer sheet 60 in the product width direction is disposed along the leg opening, and the entire leg stretchable part and the outer sheet 60 overlap in the thickness direction. On the other hand, the outer end of the back sheet 60a in the product width direction is linear along the product longitudinal direction, and a part of the leg stretchable part and the back sheet 60a overlap in the thickness direction.

  In the leg stretchable part, the front waistline region is positioned on the inner side in the width direction than the rear waistline region, so that the region where the front waistline region overlaps the back sheet 60a is wider than the rear waistline region side.

  Further, the leg stretchable portion 75 is disposed on the outer side in the product width direction than the second joint portion 81B of the leg side gather. The leg side gather is configured such that the contraction portion 84 on the inner side in the width direction from the second joint portion 81B rises toward the wearer with the second joint portion 81B as a base point.

  For example, if the leg stretchable part 75 is arranged on the inner side in the width direction than the second joint part 81B, the inner side in the width direction rises by the leg stretchable part 75 from the second joint part 81B, and the contraction part 84 is on the outer side in the width direction. You may stand up. When the contraction portion 84 rises outward in the width direction, there is a possibility that body fluid leaks outward in the width direction. However, by disposing the leg stretchable portion 75 on the outer side in the width direction from the second joint portion 81B, the contraction portion 84 is easily raised on the wearer side.

(3) Shape of Crotch Portion Next, the shape of the crotch portion 200 will be described. As described above, the crotch unit 200 includes the crotch expansion / contraction unit 200a. The crotch expansion / contraction part 200a is configured to maintain a flat shape in a part of the crotch region when the disposable diaper is worn rather than other parts of the absorber 40. The crotch part 200 includes a crotch expansion / contraction part 200a that can expand and contract at least in the product longitudinal direction L or the product width direction W.

  The crotch stretchable portion 200a is provided separately from the leg stretchable portion 75 and overlaps the absorbent core 40a (in this embodiment, between the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a). Position), 60% or more of the length in the width direction of the absorbent core 40a at the overlapping position is contracted. In this way, by contracting the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200a, the absorbent core 40a contracts, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not contract. Become.

  On the other hand, the absorbent core 40a located in the front waist region and the rear waist region located outside the product longitudinal direction from the crotch stretch part 200a is not shrunk by the crotch stretch part 200a. The crotch part 200 that is maintained in a flat shape at the crotch part of the disposable diaper in a state of being held around the waist does not excessively adhere to the body, and as a result, the crotch part 200 is appropriately disposed along the body. .

  In addition, since the crotch part 200 can be expanded and contracted along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are likely to rise due to the shrinkage of the crotch part 200. Form a flat crotch region along the body. Since the front waistline region and the back waistline region rise from the crotch stretchable part 200a, the fit of the disposable diaper 10 to the wearer is improved.

  The crotch stretchable part 200a is preferably composed of a stretchable sheet. By configuring the crotch stretchable portion 200a 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 200a may be configured by arranging a plurality of thread-like or 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 expansion / contraction part 200a, 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 200a is preferably 1.2 times or more and 1.8 times or less. In the present embodiment, the expansion rate of the crotch expansion / contraction part 200a is set to 1.4 times. The elongation rate means the degree of expansion in the expansion / contraction direction (product longitudinal direction L) of the crotch expansion / contraction part 200a, and is defined as follows.

The elongation rate means the degree of expansion of the crotch expansion / contraction part 200a in the expansion / contraction direction (product longitudinal direction L in the present embodiment), and is defined as follows.
Elongation rate = (length in the expansion / contraction direction of the crotch expansion / contraction part 200a in the maximum expansion state) / (length in the expansion / contraction direction of the crotch expansion / contraction part 200a 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 200a in the natural state”.

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

  Further, the center of the crotch stretchable part 200a in the product longitudinal direction L is arranged on the front waistline region 20 side of the center of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200a 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 in the product longitudinal direction L of the crotch 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 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 with reference to FIG. 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 placing step, the first leg stretch material 76 and the second leg stretch material 77 constituting the leg stretchable portion 75, the other web such as the web constituting the top sheet, the anti-rotation, etc. The components constituting the disposable diaper 10 such as a leakage sheet and an absorbent body are placed.

  In the leg periphery forming step, the top sheet 50, the exterior sheet 60, and the like are cut along the recesses forming the leg periphery region. Thereby, the leg opening part 35 arrange | positioned around a wearer's leg is formed.

  In the continuous body cutting step, the continuous body in which the top sheet 50, the exterior sheet 60, the absorbent body 40, the first leg elastic material 76 and the second leg elastic material 77 are arranged is made into a size of one product along the width direction W. Disconnect. Thereby, the disposable diaper 10 is manufactured.

  Next, the structure of the manufacturing apparatus of the absorbent article used in the component mounting process which arrange | positions the leg expansion-contraction part 75 among the manufacturing methods mentioned above is demonstrated in detail. FIG. 5 is a side view showing the absorbent article manufacturing apparatus 100 according to the embodiment. The absorbent article manufacturing apparatus 100 includes a supply mechanism 110, a swing mechanism 120, a guide mechanism 130, a cutting mechanism 140, an installation mechanism 150, and an adhesive application mechanism 160. The absorbent article manufacturing apparatus 100 is an apparatus that attaches a leg stretchable portion 75 that is continuously conveyed onto a web that is conveyed in a state in which component parts constituting the absorbent article are continuous.

The component placing process for arranging the leg expansion / contraction part 75 includes a conveying process, an extending process, a swinging process, a leg cutting process, and a pasting process.
A conveyance process conveys the continuous belt-like 1st leg elastic material 76 and the continuous thread-like 2nd leg elastic material 77 separately.

  In the extension process, the first leg elastic member 76 and the second leg elastic member 77 are conveyed in a state where the first leg elastic member 76 and the second leg elastic member 77 are joined by the supply mechanism 110 and the swing mechanism 120. Stretch in the direction. In the present embodiment, the first leg elastic member 76 and the second leg elastic member 77 are joined and joined, and the first leg elastic member 76 and the second leg elastic member 77 are extended in the transport direction in the joined state. It is configured as follows.

  Specifically, the second leg stretchable material 77 extended in the transport direction is continuously transported upstream of the supply mechanism 110 in the transport direction. An adhesive is applied to the second leg stretchable material 77 by an adhesive application mechanism 160. The adhesive application mechanism 160 is a spray-type device that applies an adhesive (for example, a hot-melt adhesive), and applies the adhesive to the second leg stretchable material 77 being conveyed.

  Next, the second leg stretchable material 77 coated with an adhesive is affixed to the first leg stretchable material 76 that is continuously conveyed. Thereby, the 1st leg elastic material 76 and the 2nd leg elastic material 77 are integrated and joined. At this time, the first leg elastic material 76 is not extended (or extended so as to have a lower elongation ratio than the second leg elastic material 77), so that the elongation rate of the second leg elastic material 77 is set to the first leg elastic material. It can be higher than 76 elongation.

  Note that the adhesive may be applied to the first leg stretchable material 76 without applying the adhesive to the second leg stretchable material 77. However, by applying the adhesive to the second leg stretchable member 77 having a relatively short width, the amount of adhesive applied can be suppressed. Moreover, you may comprise so that an adhesive agent may be apply | coated to the 1st leg expansion-contraction material 76 and the 2nd leg expansion-contraction agent 77, respectively.

  Next, the first leg elastic member 76 and the second leg elastic member 77 are conveyed by the supply mechanism 110, and the first leg elastic member 76 and the second leg elastic member 77 are sent out toward the swing mechanism 120. The supply mechanism 110 includes a first rotation mechanism 111, a first roller 112, a belt member 113, and a nip roller 114. The first rotating mechanism 111 is configured to convey the leg-hole elastic member along the outer circumferential surface in the conveying direction MD with the first rotating shaft 111a as the turning center. The belt member 113 is disposed on the outer peripheral surface of the first rotation mechanism 111, and the first leg elastic member 76 and the second leg elastic member 77 are arranged on the outer periphery of the first rotation mechanism 111 via the belt member 113. It is conveyed along the surface.

  The first roller 112 is disposed upstream of the first rotating mechanism 111 in the transport direction MD. The belt member 113 is an endless belt that turns between the first rotation mechanism 111 and the first roller 112. The first leg elastic member 76 and the second leg elastic member 77 are conveyed by the belt member 113 in contact with the outer peripheral surface of the belt member 113. The nip roller 114 is disposed to face the outer peripheral surface of the first rotation mechanism 111. The first leg elastic member 76 and the second leg elastic member 77 pass between the belt member 113 and the nip roller 114.

  The first rotation mechanism 111 and the first roller 112 rotate counterclockwise as shown in FIG. 5, and the belt member 113 moves counterclockwise. The first leg elastic member 76 and the second leg elastic member 77 are transported from the first roller side to the first rotating mechanism side, and are then separated from the outer peripheral surface of the first rotating mechanism to perform the second rotation of the swing mechanism 120. It is conveyed toward the mechanism 121.

  The rotation speed of the second rotation mechanism 121 is configured to be higher than the rotation speed of the first rotation mechanism 111. The first leg elastic member 76 and the second leg elastic member 77 are transported in the process of being guided from the first rotating mechanism 111 to the second rotating mechanism 121 due to the speed difference between the first rotating mechanism 111 and the second rotating mechanism 121. It is comprised so that it may be expand | extended. The 1st leg elastic material 76 and the 2nd leg elastic material 77 conveyed by a 1st rotation mechanism are comprised so that the elongation rate of a 2nd leg elastic material may become higher than the elongation rate of a 1st leg elastic material. In this state, the second leg stretchable member 77 is configured so that the stretch rate of the second leg stretchable member 77 is higher than the stretch rate of the first leg stretchable member 76 even when reaching the second rotating mechanism 121.

  In addition, in this Embodiment, although comprised so that the leg expansion-contraction part 75 may be conveyed by the supply mechanism 110, the 1st leg elastic material and the 2nd leg elastic material were bonded together without providing the supply mechanism 110. It may be configured such that the leg expansion / contraction part 75 is guided to the swing mechanism 120 later.

  In the swinging step, the swinging mechanism 120 transports the extended first leg stretchable material 76 and the second leg stretchable material 77 while displacing them in the crossing direction perpendicular to the transporting direction. The swing mechanism 120 includes a second rotation mechanism 121, a third rotation mechanism 122, and a connecting arm 123. The second rotating mechanism 121 conveys the leg expansion / contraction part supplied from the first rotating mechanism 111 along the outer peripheral surface around the second rotating shaft 121a, and conveys it toward the fourth rotating mechanism 131 described later. To do.

The second rotating mechanism 121 is connected via a connecting arm 123 to a third rotating mechanism 122 that rotates about a third rotating shaft 122a. One end 123c of the connecting arm 123 is connected to the outer peripheral surface of the third rotating mechanism 122, and the other end 123d of the connecting arm 123 is connected to the second rotating shaft 121a of the second rotating mechanism 121. When the third rotation mechanism 122 is driven to rotate, the second rotation mechanism 121 swings in the width direction orthogonal to the transport direction MD. The second rotating mechanism 121 sends out the first leg elastic member 76 and the second leg elastic member 77 toward the guide mechanism 130 while swinging in the width direction at a predetermined cycle. The leg elastic material is conveyed toward the guide mechanism 130 while being displaced in the width direction, and the first leg elastic material 76 and the second leg elastic material 77 sent out from the swing mechanism 120 are on the outer peripheral surface of the guide mechanism 130. Are arranged in a curved line.
Part 75

  The guide mechanism 130 installs the first leg elastic member 76 and the second leg elastic member 77 while maintaining the shapes of the first leg elastic member 76 and the second leg elastic member 77 supplied from the swing mechanism 120. A fourth rotating mechanism 131 that feeds the head toward the head. The fourth rotation mechanism 131 has a plurality of holding members (not shown), and conveys the first leg elastic member 76 and the second leg elastic member 77 via the holding member.

  In the leg cutting process, the cutting mechanism 140 cuts the first leg stretch material 76 and the second leg stretch material 77 with the product length. The cutting mechanism 140 cuts the first leg elastic member 76 and the second leg elastic member 77 for each holding member. The first leg stretchable material 76 and the second leg stretchable material 77 cut by the cutting mechanism 140 become the installation length of the leg stretchable portion 75 in each product.

  In the pasting step, the cut first leg stretch material 76 and second leg stretch material 77 are pasted to the web by the installation mechanism 150. The installation mechanism 150 includes a plurality of rollers, and joins the components by sandwiching the components between the rollers. Specifically, for example, the first leg elastic member 76 and the second leg elastic member 77 cut by the cutting mechanism 140 are intermittently installed on the outer sheet web 60W to which the outer sheet 60 is continuously conveyed. . Through the above steps, the leg elastic portion 75 can be disposed on the web.

  In the installation mechanism 150, the first leg stretch member 76 and the second leg stretch member 77 are bonded to the exterior sheet web, and then the absorber 40 and the top sheet 50 to which the adhesive is applied by the adhesive application mechanism 160 are continuously connected. Affix the top sheet web 50W. In this way, a continuous body in which the disposable diaper is continuous in the product longitudinal direction L is formed. Next, the continuous body is cut into the size of one product along the product width direction W. Thereby, the disposable diaper 10 is manufactured.

  In this embodiment, the leg stretchable part 75 is installed on the exterior sheet web 60W, but the present invention is not limited to this configuration, and in an absorbent article having a side sheet, the leg is formed on the web constituting the side sheet. The stretchable part 75 may be disposed, or a leg-hole elastic member may be disposed on another web.

In the present embodiment, the first leg elastic member 76 and the second leg elastic member 77 are transported in a joined state, but the first leg elastic member 76 and the second leg elastic member 77 are not joined. It may be configured to be conveyed to each other in a state and individually extended or rocked.
Further, the leg cutting step may be performed after the swinging step, or the swinging step may be performed after the leg cutting step.

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

  In the continuous body 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 and effect
In the disposable diaper according to the present embodiment, the first leg stretchable material and the second leg stretchable material are provided together to partially contract the non-stretchable side sheet by the second leg stretchable material 77, and the leg It is possible to suppress the generation of wrinkles in the entire stretchable portion 75 and to arrange the entire leg stretchable portion 75 in a planar shape around the wearer's leg by the first leg stretchable material 76.

  Moreover, since the 2nd leg elastic material is arrange | positioned along the inner side edge part of the product width direction of the 1st leg elastic material located inside the product width direction center of a 1st leg elastic material, it is a wearer's leg. It can suppress that the outer edge part of the product width direction of the 1st leg elastic material which is a place closely_contact | adhered around is sticking too much, and the irritation | stimulation to the skin by a leg periphery opening part can be reduced.

  Since the length of the first leg elastic material in the product width direction is constant, the leg elastic part 75 can be arranged so as to contact the same area along the wearer's leg, and the leg elastic part 75 is locally around the leg. It can prevent sticking to.

  Since the 2nd leg elastic material 77 is arrange | positioned at the non-skin contact surface side of the 1st leg elastic material 76, the part contracted with the 2nd leg elastic material becomes difficult to hit skin directly. Reduces irritation to the skin caused by wrinkles.

  The leg expansion / contraction part 75 is arrange | positioned rather than the 2nd junction part 81B of leg side gathers in the product width direction outer side. For example, if the leg stretchable part 75 is arranged on the inner side in the width direction than the second joint part 81B, the inner side in the width direction rises by the leg stretchable part 75 from the second joint part 81B, and the contraction part 84 is on the outer side in the width direction. You may stand up. However, by disposing the leg stretchable portion 75 on the outer side in the width direction from the second joint portion 81B, the contraction portion 84 is easily raised on the wearer side.

(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 2nd leg elastic material may not be arrange | positioned along the 1st leg elastic material, and may be arrange | positioned partially shifted.
The length of the first leg stretchable material in the product width direction is not necessarily constant, and the length in the product width direction may be partially different.
The outer end portion in the product longitudinal direction of the first leg stretchable material and the outer end portion in the product longitudinal direction of the second leg stretchable material may coincide with each other.

  The leg stretchable part 75 may coincide with the joint part of the leg side gathers in the product width direction, or may be arranged on the inner side in the product width direction than the joint part of the leg side gathers.

  Moreover, although embodiment mentioned above demonstrated as an example the open-type disposable diaper, this invention can also be applied to a pants-type disposable diaper. For pants-shaped diapers having a waistline opening and a pair of leghole openings by joining the left and right edges of the outer layer sheet forming the front waistline and the back waistline, the outer layers of the front waistline and the back waistline The sheet has an elastic element that can be contracted and extended in the product width direction W, and the disposable diaper is held around the waist of the wearer by contracting them. That is, the range where the left and right side edges extending in the product longitudinal direction L are joined is the waistline holding portion.

  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 flaps
71 ... Elastic member
75 ... Leg stretchable part
75F… The front waistline side of the leg expansion / contraction part
75I ... Inner width region of leg expansion / contraction part
75R ... Leg waist part
76 ... 1st leg elastic
77 ... 2nd leg elastic
80… Legside gather
81 ... Junction
81A ... 1st joint part
81B ... Second joint
82 ... Free end
84 ... contraction
85 ... Hip elastic part
90 ... Fastening tape
95 ... Target section
115 ... Notch
125 ... Notch
200 ... Crotch part
200a ... Crotch expansion / contraction part
L: Product longitudinal direction
W ... Product width direction

Claims (10)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
An absorbent body straddling the crotch region and extending from the crotch region toward at least one of the front waistline region and the rear waistline region;
A disposable diaper provided with a leg stretchable part arranged along a leg opening provided on the outer side in the product width direction than the absorbent body and stretchable along the product longitudinal direction,
The leg opening and the leg stretchable part extend toward the product width direction outer side from the crotch region toward the product longitudinal direction outer side,
The leg stretchable part is disposed in a first leg stretchable material placement region in which the first leg stretchable material having a predetermined length in the product width direction and the first leg stretchable material are disposed, and the first A thread-like second leg stretchable material having a shorter length in the product width direction than the one leg stretchable material,
A non-stretchable sheet material joined to the first leg stretchable material and / or the second leg stretchable material on the skin contact surface side from the first leg stretchable material and the second leg stretchable material, Is provided,
The elongation rate in the product longitudinal direction of the second leg stretchable material is higher than the elongation rate in the product longitudinal direction of the first leg stretchable material,
Wherein said product longitudinal end of the second leg elastics, the said product longitudinal ends are located in the product longitudinal direction inner side than, Operation s discarded diaper of the first leg elastics. A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
An absorbent body straddling the crotch region and extending from the crotch region toward at least one of the front waistline region and the rear waistline region;
A disposable diaper provided with a leg stretchable part arranged along a leg opening provided on the outer side in the product width direction than the absorbent body and stretchable along the product longitudinal direction,
The leg opening and the leg stretchable part extend toward the product width direction outer side from the crotch region toward the product longitudinal direction outer side,
The leg stretchable part is disposed in a first leg stretchable material placement region in which the first leg stretchable material having a predetermined length in the product width direction and the first leg stretchable material are disposed, and the first A thread-like second leg stretchable material having a shorter length in the product width direction than the one leg stretchable material,
A non-stretchable sheet material joined to the first leg stretchable material and / or the second leg stretchable material on the skin contact surface side from the first leg stretchable material and the second leg stretchable material, Is provided,
The elongation rate in the product longitudinal direction of the second leg stretchable material is higher than the elongation rate in the product longitudinal direction of the first leg stretchable material,
A plurality of non-stretchable sheet materials are laminated on the non-skin contact surface side of the leg stretchable part,
The number of layers of the sheet material on the front waistline region side from the center in the product longitudinal direction of the leg stretchable part is greater than the number of layers of the sheet material on the rear waistline region side from the center in the product longitudinal direction of the leg stretchable part. often, use had discarded diapers. The disposable diaper according to claim 1 or 2 , wherein the second leg stretchable material is disposed along an inner end portion of the first leg stretchable material in the product width direction. The elongation rate of the first leg stretchable material is 1.4 to 2.2 times,
It said extension of the second leg elastics are 1.7-2.5 times, disposable diaper according to any one of claims 1 to 3. The disposable diaper according to any one of claims 1 to 4 , wherein the second leg stretchable material is disposed on the non-skin contact surface side of the first leg stretchable material.   The disposable diaper according to any one of claims 1 to 5, wherein the second leg stretchable material is disposed on the inner side in the product width direction than the center of the first leg stretchable material in the product width direction. It is disposed on the inner side in the product width direction than the leg stretchable part, and includes a standing leg side stretchable part having a shrinkable part that can be stretched along the product longitudinal direction.
The disposable diaper according to any one of claims 1 to 6 , wherein the leg stretchable part is disposed on the outer side in the product width direction with respect to a rising base end part of the leg side stretchable part. An inner end portion of the product width direction of the first leg elastics, said the outer end portions of the product width direction of the first leg elastics are disposed in parallel, of claims 1 to 7 The disposable diaper described in any one. Absorbency for attaching the first leg elastic material and the second leg elastic material constituting the leg elastic part arranged along the leg opening on the web which is conveyed in a state in which the components constituting the disposable diaper are continuous. A method for manufacturing an article, comprising:
A conveying step of separately conveying the continuous first belt-shaped first leg elastic material and the continuous thread-shaped second leg elastic material;
In the state where the first leg elastic material and the second leg elastic material are merged, an extension step of extending the first leg elastic material and the second leg elastic material in the conveying direction;
A swinging process for transporting the first leg stretchable material and the second leg stretchable material in an extended state while displacing them in a crossing direction perpendicular to the transport direction;
A cutting step of cutting the first leg stretchable material and the second leg stretchable material by a product length;
A pasting step of pasting the cut first leg stretch material and the second leg stretch material on the web;
In the transporting step, the first leg stretchable material and the second leg stretchable material are stretched in the transport direction and the stretch rate of the second leg stretchable material is higher than the stretch rate of the first leg stretchable material. The manufacturing method of an absorbent article characterized by conveying a 2nd leg elastic material. The extending step extends the first leg stretchable material and the second leg stretchable material in the transport direction in a state where the first leg stretchable material and the second leg stretchable material are joined. Item 10. A method for producing an absorbent article according to Item 9 .

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