WO2017110336A1

WO2017110336A1 - Disposable diaper

Info

Publication number: WO2017110336A1
Application number: PCT/JP2016/084417
Authority: WO
Inventors: 拓也深山; 坂口　智; 山中　康弘; 真紀辻井
Original assignee: ユニ・チャーム株式会社
Priority date: 2015-12-22
Filing date: 2016-11-21
Publication date: 2017-06-29
Also published as: TWI716504B; JP2017113153A; CN108472171A; TW201733543A; KR20180098319A; JP6420754B2; CN108472171B

Abstract

A disposable diaper (10) includes: a front waist area (20); a back waist area (30); a crotch area (25); a pair of fastening tapes (90); an absorbent core (40a); a waist-encircling elastic portion (85) which is disposed at the rear edge of the disposable diaper and extends and retracts in the width direction; a sheet material disposed overlapping the waist-encircling elastic portion; and a joint portion row (87L) in which joint portions (87) which join the waist-encircling elastic portion to the sheet material are disposed spaced apart in the longitudinal direction. A plurality of the joint portion rows are disposed spaced apart in the width direction. The disposable diaper includes first regions (R1) which extend from both outside ends of the waist-encircling elastic portion toward the inside in the width direction, and which do not include the joint portion rows; a second region (R2) which extends rearward from the front edge of the waist-encircling elastic portion, and which does not include the joint portion rows; and third regions (R3) which are located to the inside of the first regions, in the width direction, are located further to the rear than the second region, and include the joint portion rows. The first regions are located further to the outside, in the width direction, than the absorbent core.

Description

Disposable diapers

The present invention relates to a disposable diaper.

A disposable diaper having an embossed row between fastening tapes around the rear waist is disclosed. A plurality of the embossed rows are arranged along the longitudinal direction at intervals in the width direction.

JP 2004-90902 A

In the disposable diaper of Patent Document 1, the rigidity of the region where the embossed rows are provided is higher than the rigidity of the region where the embossed rows are not provided. Therefore, the disposable diaper of patent document 1 is formed with a ridge by the embossed row. By forming irregularities due to scissors between the fastening tapes, gaps due to irregularities are formed between the rear edge of the disposable diaper and the body. By forming a gap between the rear edge of the disposable diaper and the body, there is a risk of excrement leaking on the back side of the wearer.

Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to improve the fit of the rear edge of the disposable diaper and suppress the leakage on the back side of the wearer.

The disposable diaper (disposable diaper 10) according to the present disclosure includes a front waistline region (front waistline region 20), a back waistline region (rear waistline region 30), the front waistline region, and the back waistline region. A crotch region (inseam region 25) located between the longitudinal direction (longitudinal direction L) from the front waistline region to the back waistline region, and a width direction (width direction W) orthogonal to the longitudinal direction A pair of fastening tapes (fastening tape 90) extending along the width direction in the rear waist region and fastened to the front waist region, and straddling the crotch region, the front waist region and the rear An absorption core (absorption core 40a) extending toward at least one of the waist area, a waist extension part (waist extension part 85) disposed at a rear edge of the disposable diaper and extending in the width direction, A sheet material arranged to overlap the waist elastic part and the waist extension A joint portion (joint portion 87) for joining the sheet portion and the sheet material, and a joint portion row (joint portion row 87L) arranged at intervals in the longitudinal direction, the joint portion row having the width A plurality of disposable diapers arranged at intervals in the direction, extending from both outer edges of the waist elastic part to the inner side in the width direction, and having no joint row (first region) R1), a second region (second region R2) that extends rearward from the front edge of the waist elastic part, and does not have the joint row, and is located on the inner side in the width direction than the first region. And a third region (third region R3) located behind the second region and having the joint row, wherein the first region is located on the outer side in the width direction than the absorbent core. The gist is to do.

According to the present disclosure, it is possible to improve the fit of the rear end edge of the disposable diaper and suppress leakage on the wearer's back side.

It is an expanded top view of the disposable diaper concerning this embodiment. It is sectional drawing of the disposable diaper along the F1-F1 line | wire shown in FIG. It is sectional drawing of the disposable diaper along the F2-F2 line | wire shown in FIG. It is the expansion | deployment top view which expanded the rear end edge of the disposable diaper shown in FIG. It is the expansion | deployment top view which expanded the rear-end edge of the disposable diaper which concerns on a modification.

Next, an embodiment of the disposable diaper 10 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.

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

(1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG. FIG. 4 is an enlarged plan view in which a rear end edge of the disposable diaper shown in FIG. 1 is enlarged. 1 and 4 show a state in which the elastic members of the leg stretchable part 75 and the leg side stretchable part 80 are extended until the top sheet 50, the side flap 70, etc. constituting the disposable diaper are not formed. FIG.

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

A pair of leg openings 35 are formed in the disposable diaper 10. The leg opening 35 is provided at the side end in the width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer in a state where the disposable diaper is worn by the wearer.

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

The disposable diaper 10 has an absorber 40. The absorber 40 has an absorption core 40a and a core wrap 40b. The absorbent core 40a extends over the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the back waistline region 30.

The absorbent core 40a is the same as a conventional disposable diaper, and can be appropriately configured using known members and materials such as pulverized pulp and high-absorption polymer. The absorption core 40a is wrapped by a sheet-like core wrap 40b. The core wrap 40b is a sheet that covers the absorbent core 40a. The rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b substantially coincide, and the front end edge of the absorbent core 40a and the front end edge of the core wrap 40b substantially coincide. More specifically, the distance between the rear edge of the absorbent core 40a and the rear edge of the core wrap 40b is 5 mm or less, and the distance between the front edge of the absorbent core 40a and the front edge of the core wrap 40b is 5 mm or less. .

As shown in FIG. 4, the absorbent core 40a is formed with a low basis weight area 110 having a lower basis weight of the absorbent material than other portions of the absorbent core 40a. The low weight area 110 is located at the center in the width direction of the rear end edge of the absorbent core 40a. The width of the low weight area 110 in the width direction W becomes wider toward the rear end edge of the absorbent core 40a. More specifically, the low basis weight area 110 has a wedge shape in the plan view of the disposable diaper 10. When contracted in the width direction by the waist elastic section 85, which will be described later, the low weight area 110 is more easily contracted than the periphery, and the rear end of the absorbent core 40a has a cup shape along the wearer's buttocks.

A liquid-permeable top sheet 50 is provided on the surface side (skin facing surface side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back side (non-skin facing side) of the absorber 40. An exterior sheet 60 is provided on the back side of the back sheet 60a. The front end edge of the back sheet is located behind the front end edge of the disposable diaper, and the rear end edge of the back sheet is located ahead of the rear end edge of the disposable diaper.

Side flaps 70 are provided on the outer edges (outer ends in the width direction) of the absorber 40, respectively. The side flap 70 straddles the front waistline region 20, the crotch region 25, and the back waistline region 30, and is disposed on the outer side in the width direction than the absorber 40. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets. The side flap 70 is located on the skin facing surface side with respect to the absorbent core 40a, and extends outward in the width direction with respect to the absorbent core 40a.

The side flap 70 is provided with a pair of leg stretchable parts 75 that are disposed on the inner side in the width direction than the leg opening 35 and can be stretched in the longitudinal direction L. The leg expansion / contraction portions 75 are respectively arranged on the inner side in the width direction than the left and right leg openings. The leg expansion / contraction part 75 is comprised with the elastic sheet, the rubber thread, etc. The leg stretchable part 75 of the present embodiment is composed of three pieces of left and right thread rubber, but may be composed of a stretchable sheet made of a nonwoven fabric. The leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a longitudinal direction.

The position in the width direction of the leg expansion / contraction part 75 may have changed. Specifically, the distance between the inner ends of the pair of left and right leg stretchable parts in the product width direction W becomes wider from the crotch region 25 toward the front waistline region 20 and from the crotch region 25 to the back waistline region 30. It may be widened as you head for. By arranging the leg stretchable part in a shape that narrows at the crotch and spreads around the front and rear torso, it becomes possible for the leg stretchable part to follow the body line more, and the leg stretchable part suitably around the leg of the wearer The part will be extended.

A pair of leg side stretchable parts 80 extending along the longitudinal direction L are provided inside the pair of leg stretchable parts 75 in the width direction. The leg side stretchable portion 80 is an upright stretchable gather having an elastic member 81 that is disposed at the inner end in the width direction of the side flap 70 and stretches in the longitudinal direction.

In addition, the disposable diaper 10 includes a crotch expansion / contraction part 200 disposed in a region overlapping the absorber in the crotch region 25. The crotch stretchable part 200 is configured to maintain a flat shape in a part of the crotch region 25 when the disposable diaper is worn rather than the other part of the absorber 40. The crotch stretchable part 200 is configured to be stretchable in at least the longitudinal direction L or the width direction W.

A first notch 115 and a second notch 125 are formed in the absorption core 40a of the crotch region 25. The first notch 115 and the second notch 125 are slits formed in the absorbent core 40a. The slit is a portion where no absorbing material exists. The first notch 115 and the second notch 125 each have a notch shape extending from the outer edge of the absorbent core 40a toward the inner side in the width direction.

The fastening tape 90 is a pair and extends along the width direction W in the rear waistline region 30, and is fastened to the non-skin facing surface of the front waistline region 20, thereby disposing the disposable diaper 10 on the wearer's body. Hold on. The fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 includes a base sheet 91 connected to the side flap 70 and a hook sheet 92 provided with a plurality of engagement hooks (not shown) and fixed to the base sheet 91. The hook sheet 92 is an area where an engagement hook is provided.

The target portion 95 is provided on the non-skin facing surface of the exterior sheet 60 in the front waist area 20. The target portion 95 is configured so that the engaging hook of the fastening tape 90 is hooked, and functions as a loop of a hook and loop locking system. As the target portion 95, for example, an air-through nonwoven fabric can be used. The disposable diaper may be configured such that the fastening tape 90 is fixed to the exterior sheet 60 in the front waistline region 20 without having a target portion.

Disposable diaper 10 has a waist elastic part that can expand and contract in the width direction. The waist elastic part 85 is disposed in the rear waist area. The waist elastic part 85 is disposed between the pair of fastening tapes 90 in the width direction, and contracts between the fastening tapes 90 in the width direction. The front end edge of the waist elastic part 85 has a curved shape in which the center in the width direction is recessed rearward.

In this embodiment, the waist elastic part is constituted by an elastic sheet, and for example, an elastic film, an elastic nonwoven fabric, and urethane can be used. The waist elastic part 85 may be formed of an elastic nonwoven fabric. The waist elastic part 85 made of an elastic nonwoven fabric makes it easier to maintain the breathability around the waist of the infant compared to the waist elastic part made of an elastic film. Note that the waist elastic part is a part that substantially expands and contracts in the width direction, and is a concept that excludes a part where the elastic sheet is disposed in a state where the elastic force is not exhibited. Therefore, the outer edge of the waist elastic part which will be described later is not the outer edge of the elastic sheet, but the outer edge of the part that expands and contracts. In the present embodiment, a stretchable film having a basis weight of 20 to 45 g / m2 is used as the waist stretchable portion. However, the waist elastic part 85 may be configured by other configurations such as a plurality of thread rubbers. The waist stretchable portion is stretched to a predetermined magnification with respect to the length in the non-stretched state (natural state), and then adhered to the backsheet 60a by a hot melt adhesive or heat treatment. The waist elastic part will be described in detail later.

Also, the disposable diaper is provided with a plurality of joints for joining the waist elastic part and the sheet material. The joining portion 87 joins the waist elastic portion 85 and the sheet material overlapping the waist elastic portion 85. The joint portion will be described in detail later.

The outer edge of the outer waist area of the exterior sheet is located on the outer side in the width direction than the outer edge of the front waist area of the exterior sheet. The outer edge of the exterior sheet is the outer edge of the area excluding the fastening tape in the disposable diaper. The length in the width direction of the rear waist area of the exterior sheet is longer than the length in the width direction of the front waist area of the exterior sheet. Therefore, when fastening the fastening tape to the front waist area, the outer edge of the back waist area can be easily pulled toward the front side of the wearer's body. By pulling the outer edge of the rear waist area toward the front side of the wearer's body, the waist elastic part can be extended, and the rear edge of the disposable diaper can be fitted to the wearer's body.

The length of the exterior sheet in the width direction is longer from the crotch region toward the rear edge of the disposable diaper. More specifically, the length in the width direction of the exterior sheet in the region where the pair of fastening tapes is disposed is longer than the length in the width direction of the exterior sheet in the region ahead of the low weight area of the absorbent core. Since the region in which the fastening tape is disposed has a relatively long length in the width direction, the fastening tape is likely to be positioned on the outer side in the width direction than the absorbent core even when contracted by the waist elastic part. The absorbent core is an area on which the wearer is placed when worn. By disposing the fastening tape on the outer side in the width direction than the absorbent core, it is possible to prevent the fastening tape from being disposed between the wearer's body and the absorbent core, and to suppress irritation to the skin by the fastening tape.

(2) Configuration of waist elastic part and joint part The waist elastic part 85 extends from the center in the width direction of the disposable diaper toward both outer sides in the width direction, and is constituted by an elastic sheet extending in the width direction. Yes. Although the waist stretchable portion according to the present embodiment is configured to stretch in the width direction, the waist stretchable portion may be configured to stretch in the width direction and the longitudinal direction.

The rear edge of the waist elastic part 85 coincides with the rear edge of the disposable diaper. The front end edge of the waist elastic part 85 is located in front of the rear end edge of the absorbent core 40a and in front of the rear end edge of the core wrap 40b. At least a part of the waist elastic part 85 overlaps the absorbent core 40a in a plan view of the disposable diaper. Further, the waist elastic portion 85 straddles the rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b, and extends forward of the rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b. The outer edge of the waist elastic part 85 is located on the inner side in the width direction than the inner edge (the inner edge in the width direction) of the fastening tape. The waist elastic part 85 and the fastening tape 90 are separated in the width direction. Since the waist stretchable portion 85 and the fastening tape 90 are separated from each other in the width direction, the wearer can easily grasp the stretch margin that the waist stretchable portion can be stretched and operate the fastening tape.

The waist elastic part is located on the non-skin facing side of the absorbent core 40a. In the present embodiment, the waist elastic part is disposed between the exterior sheet 60 and the back sheet 60a. The position of the waist elastic part is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60. In the present embodiment, the skin sheet positioned on the skin facing surface side of the waist elastic part includes a top sheet 50, a side flap 70, and a back sheet 60a. The non-skin surface sheet positioned on the non-skin facing surface side of the waist elastic part includes an exterior sheet 60.

In the region where the waist elastic part is arranged, a joint is formed. The joint portion is formed in a region where the waist elastic portion 85 is disposed. The joining part 87 joins the waist elastic part 85 and the sheet material overlapping the waist elastic part 85 by heat sealing. In addition, the part joined not only by the part joined by heat sealing but the other welding methods, such as ultrasonic welding, and the adhesive agent may be sufficient as a junction part.

Specifically, the sheet material includes a top sheet 50, a side flap 70, a back sheet 60a, and an exterior sheet 60. In the region where the top sheet 50 and the waist elastic part overlap, the joining part joins the top sheet 50, the waist elastic part, the back sheet 60a, and the exterior sheet 60. In the region where the side flap 70 and the waist elastic part overlap, the joint part joins the side flap 70, the waist elastic part, the back sheet 60a, and the exterior sheet 60.

接合 Junction 87 is point-like in a plan view of disposable diapers. The joined portion formed by heat sealing is turned into a film, and the air permeability of the portion is lowered. By arranging the joints in a dot shape, air permeability can be ensured in a region around the joints, and deterioration of the air permeability around the waist can be suppressed. The joint portions 87 are arranged along the longitudinal direction L. The joint portion includes a center joint portion 871 disposed in a fourth region R4, which will be described later, and a side joint portion 872 disposed in a third region R3, which will be described later. The central joint 871 is displaced in the longitudinal direction from the central joint 871 adjacent in the width direction. That is, the central joint 871 is arranged in a staggered manner. The portion where the joint portion is provided has higher rigidity than the portion where the joint portion is not provided, and the stretchability of the waist elastic portion is reduced. By arranging the central joints 871 in a staggered manner, the rigidity in the longitudinal direction is improved while suppressing the decrease in the stress in the width direction compared to the configuration in which the central joints 871 are continuously arranged. it can.

The side joint portion 872 has the same position in the longitudinal direction as the side joint portion 872 adjacent in the width direction. The central joint portion 871 and the side joint portion 872 are arranged with a gap in the longitudinal direction L and the width direction W. A distance D1 in the longitudinal direction of the central joint 871 is larger than a distance D2 in the longitudinal direction of the side joint 872. A distance D3 in the width direction of the central joint portion 871 is larger than a distance D4 in the width direction of the side joint portion 872. A distance D1 in the longitudinal direction of the central joint 871 coincides with a distance D3 in the width direction of the central joint. Further, the distance D2 in the longitudinal direction of the side joint portion coincides with the distance D4 in the width direction of the side joint portion.

The joint portion row 87L is a row of a plurality of joint portions arranged at intervals in the longitudinal direction L. A plurality of the joint rows 87L are provided at intervals in the width direction. The front end edge of the joint row 87L coincides with the rear end edge of the second region R2. The rear end edge of the joint line 87L is disposed at the rear end edge of the disposable diaper. The joint portion row 87L includes a central joint portion row 871L in which the central joint portions 871 are arranged at intervals, and a side joint portion row 872L in which the side joint portions 872 are arranged at intervals. A plurality of center joint rows 871L are arranged at intervals in the width direction. The interval in the width direction of the central joint row 871L is larger than the interval in the width direction of the side joint row 872L.

The disposable diaper includes a pair of first regions R1 extending inward in the width direction from both outer edges of the waist elastic part 85, a second region R2 extending rearward from the front edge of the waist elastic part 85, A plurality of third regions R3 located on the inner side in the width direction than the first region R1 and located behind the second region R2, and the center in the width direction of the disposable diaper on the inner side in the width direction than the third region R3 A fourth region R4 extending outward in the width direction from the first region, and a plurality of fifth regions R5 located between the third region R3 and the fourth region R4. In FIG. 4, the first region R1, the second region R2, the third region R3, the fourth region R4, and the fifth region R5 are indicated by different oblique lines. In addition, the disposable diaper of this Embodiment should just have 1st area | region R1, 2nd area | region R2, and 3rd area | region R3.

1st area | region R1 is arrange | positioned in the longitudinal direction whole region of the outer edge of the waist circumference expansion-contraction part 85, and is extended inside the width direction from the said outer edge. The inner edge of the first region R1 coincides with the outer edge of the second region R2, and the outer edge of the third region R3 (in the configuration in which a plurality of third regions R3 are arranged, the outermost edge in the width direction) The outer edge of the third region R3). 1st area | region R1 is located in the outer side of the width direction rather than the outer edge of the absorption core 40a. The rear end edge of the first region R1 coincides with the rear end edge of the waist elastic part 85. The front end edge of the first region R1 is coincident with the front end edge of the waist elastic part 85. The first region R1 is located on the outer side in the width direction than the absorbent core 40a. In addition, the bonding portion 87 is not provided in the first region R1. Since the joining portion 87 is not provided in the first region R1, the stretchability of the waist elastic portion 85 in the first region R1 is maintained.

At least a part of the first region R1 is arranged in a region extending in the longitudinal direction from the leg stretchable part 75. The region extending in the longitudinal direction from the leg stretchable portion 75 is a region sandwiched by two extension lines respectively extending in the longitudinal direction from the thread rubbers located on both outer sides in the width direction among the three thread rubbers.

The second region R2 is disposed between the pair of first regions R1. The second region R2 is disposed across the center in the width direction of the disposable diaper, and extends outward in the width direction from the center in the width direction of the disposable diaper. The rear edge of the second region R2 coincides with the front edge of the third region R3, coincides with the front edge of the fourth region R4, and coincides with the front edge of the fifth region R5. The front edge of the second region R2 coincides with the front edge of the waist elastic part 85. At least a part of the second region R2 overlaps a region where the weight of the absorbent core 40a is relatively high (a region other than the low weight region) and a low weight region 110 of the absorbent core 40a. At least a part of the second region R2 including the rear end edge of the second region R2 is located behind the absorbent core 40a. The outer edge of the second region R2 is located on the outer side in the width direction than the absorbent core 40a. The junction area 87 is not provided in the second region R2. Since the joining portion 87 is not provided in the second region R2, the stretchability of the waist elastic portion 85 in the second region R2 is maintained.

The third region R3 extends inward in the width direction from the inner edge of the first region R1. The inner edge of the third region R3 coincides with the outer edge of the fifth region R5. The third region R3 straddles the outer edge of the absorbent core 40a in the width direction. The rear end edge of the third region R3 coincides with the rear end edge of the waistline stretchable portion 85. The front edge of the third region R3 coincides with the rear edge of the second region R2. The third region R3 is located behind the absorbent core 40a. In the third region R3, a side joint row 872L is provided. The waist elastic portion 85 is joined to the sheet material via the side joint portion 872, and the stretchability of the side joint portion 872 is reduced. Therefore, the stretchability of the waist stretchable portion 85 in the third region R3 is lower than the regions where the joint portion is not provided (the first region R1, the second region R2, and the fifth region R5).

The fourth region R4 is disposed between the pair of fifth regions R5. The outer edge of the fourth region R4 coincides with the inner edge of the fifth region R5. The rear end edge of the fourth region R4 coincides with the rear end edge of the waistline stretchable portion 85. The front edge of the fourth region R4 coincides with the rear edge of the second region R2. The fourth region R4 is located behind the absorbent core 40a. In the fourth region R4, a central joint row 871L is provided. The stretchability of the waist stretchable portion 85 in the fourth region R4 is lower than the regions where the joint portion is not provided (the first region R1, the second region R2, and the fifth region R5).

The area of the central joint 871 is larger than the area of the side joint 872. A side junction 872 is provided in the third region R3, and a central junction 871 is provided in the fourth region R4. The area of the junction per unit area in the third region R3 is higher than the area of the junction per unit area in the fourth region R4. That is, the surface density of the joint portion in the third region R3 is higher than the surface density of the joint portion in the fourth region R4.

The fifth region R5 is disposed between the pair of third regions R3. The rear end edge of the fifth region R5 coincides with the rear end edge of the waistline stretchable portion 85. The front edge of the fifth region R5 coincides with the rear edge of the second region R2. The fifth region R5 is located behind the absorbent core 40a. The fourth region R4 and the fifth region R5 are located on the inner side in the width direction than the outer edge of the absorbent core 40a. The junction area 87 is not provided in the fifth region R5. Since the junction 87 is not provided in the fifth region R5, the stretchability of the waist elastic portion 85 in the fifth region R5 is maintained.

Further, the waist elastic part 85 has a region with a high elongation rate and a region with a low elongation rate. Specifically, a high stretch region with a relatively high stretch rate is arranged at the center in the width direction of the waist stretchable portion 85, and a low stretch region with a relatively low stretch rate is placed outside the high stretch region in the width direction. The high extension region is disposed outside the extension region in the width direction. The outer edge of the high extension region at the center in the width direction is the outer edge of the fifth region. That is, the fourth region and the fifth region are high elongation regions. The outer edge of the low extension region is the outer edge of the third region. That is, the third region is a low extension region. The first region is a high extension region.

The stretch rate of the waist stretchable portion 85 changes depending on the difference in stretch rate of the waist stretchable portion and the presence or absence of the joint 87. The first region and the fifth region are high-elongation regions and are not provided with a joint portion, and therefore, the stretch rate of the waist elastic unit 85 is the highest. The fourth region is a high elongation region, but since the joint portion is provided and the stretch rate is reduced by the joint portion, the stretch rate of the waist stretchable portion 85 is higher than that of the first region and the fifth region. Low. In addition, the third region is a low-elongation region, where a joint portion is provided, and the stretch rate is reduced by the joint portion, and thus the stretch rate is lower than that of the fourth region.

In the second region, since the joint portion is not provided, the expansion / contraction rate changes only by the difference in the expansion rate of the waist stretchable portion. Specifically, the center in the width direction (the range in the width direction of the fourth region) is a high stretch region and has a high stretch rate. On the other hand, the outer side in the width direction (range in the width direction of the third region and the fifth region) is a low extension region and has a low expansion / contraction rate.

(3) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the absorbent article which concerns on this embodiment is demonstrated. In addition, about the method which is not demonstrated in this 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 forming step, a component mounting step, a joint forming step, a leg circumference forming step, and a cutting step.

In the component forming process, the components constituting the absorbent article are formed. Specifically, for example, the absorbent body 40 is molded by laminating absorbent materials, or the fastening tape 90 is formed.

In the component placement process, on the web that constitutes the back sheet, the elastic sheet that constitutes the waist stretchable part 85, other webs such as the web that constitutes the top sheet, leak-proof sheet, absorber, leg stretch The components constituting the disposable diaper 10 such as the portion 75 are placed. In the component mounting step, the stretchable sheet that constitutes the waist stretchable portion 85 is disposed. By placing the component parts in the component part placing step, a continuous body in which the disposable diapers are continuous in the longitudinal direction is formed.

In addition, as a method of changing the expansion | extension rate of the waist periphery expansion-contraction part 85, the following method is mentioned, for example. Before the waist stretchable portion 85 is bonded to the backsheet 60a or the like, the waist stretchable portion 85 is stretched by a gear in the width direction. When stretching by the gear, gear stretching in a region (for example, the second region) where the elongation rate is lowered is weakened. Gear stretching is strengthened in a region (for example, the first region and the third region) where the elongation rate is increased. The strength of the gear extension can be adjusted by changing the depth of the gear protrusion, the pitch of the gear protrusion, and the number of times of gear extension. The stretch rate of the strongly stretched region is relatively high, and the stretch rate of the weakly stretched region is relatively low.

In the joint formation process, the joint is formed by heat sealing.

In the leg circumference forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut. Thereby, the leg opening part 35 arrange | positioned around a wearer's leg is formed. In addition, you may perform a junction part formation process after a leg periphery formation process.

In the cutting step, the continuous body in which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut along the width direction W into the size of one product. Thus, the front waistline stretchable part is disposed in the front waistline region 20, and the waistline stretchable part is disposed in the rear waistline region 30, whereby the disposable diaper 10 is manufactured.

(4) Action / Effect A portion having relatively high rigidity is formed along the longitudinal direction by the joint portion row in the third region R3, and the region where the joint portion row is disposed is contracted in the width direction by the waist elastic portion 85. Therefore, a plurality of ridges extending in the longitudinal direction are provided at intervals in the width direction. Since the ridge extending in the longitudinal direction is formed, the ridge extending in the width direction is hardly formed. When the wrinkle extending in the width direction is formed, a bending start point extending in the width direction is formed, and the rear end edge of the diaper may be lifted to cause excrement leakage. However, since it is difficult to form a ridge extending in the width direction, it is possible to suppress the rear edge of the diaper from being lifted.

Also, since the ridges extending in the longitudinal direction are formed, a plurality of bending start points are formed at intervals in the width direction, and are easily arranged along the roundness around the waist. In addition, the unevenness is formed by the heel extending in the longitudinal direction, but since the unevenness can be fitted to the body by the waist elastic part 85, the gap due to the unevenness is not formed, and leakage on the back side of the wearer can be suppressed. . In addition, since the waist stretchable part is placed at the rear edge of the disposable diaper, the rigidity of the rear edge of the disposable diaper can be increased and the rear edge of the disposable diaper can be prevented from being turned unintentionally. Can do.

1st area | region R1 located in the width direction outer side of the absorption core 40a is arrange | positioned in the position which hits a wearer's side hipbone. The first region R1 is not provided with a joining portion row, and the stretching force of the waist stretchable portion is maintained. Therefore, the first region R1 has a higher stretching force than the third region R3 provided with the joining portion row. The fit around the waist is enhanced by a strong fit to the hip bone next to the wearer by the first region R1. The gap between the body and the disposable diaper can be reduced, and excrement leakage can be suppressed.

The second region R2 is not provided with the joining portion 87, and the stretching force of the waist elastic portion 85 is maintained, so that the second region R2 has a higher stretching force than the third region R3 provided with the joining portion row. The second region R2 is relatively easy to expand and contract, the deformation from the absorption core 40a side is absorbed by the second region R2, and the deformation of the absorption core 40a is prevented from propagating to the third region R3 and the rear edge of the disposable diaper. it can. Therefore, the fit of the rear edge of the disposable diaper can be maintained.

The rear end edge of the joint row 87L may be disposed on the rear end edge of the disposable diaper. When the heel extending in the longitudinal direction reaches the rear end edge of the disposable diaper, it is difficult to form a folding point extending in the width direction at the rear end edge of the disposable diaper or in the vicinity thereof. Therefore, it is possible to prevent the rear end edge of the disposable diaper from being lifted by the folding point extending in the width direction.

At least a part of the second region R2 may be disposed behind the absorbent core 40a. At least a part of the second region R2 is disposed between the third region R3 and the absorber. The region located behind the absorbent core 40a does not deform together with the absorber, and the deformation of the absorber is difficult to propagate directly. It is possible to effectively suppress the deformation from the absorption core 40a side by the second region R2 and effectively propagate the deformation of the absorption core 40a to the third region R3.

The sheet material joined to the waist elastic part by the joint part is a skin sheet (top sheet 50, side flap 70 and back sheet 60a) located on the skin facing surface side of the waist elastic part, and the waist elastic part. And a non-skin surface sheet (exterior sheet 60) positioned on the non-skin facing surface side. The skin sheet, the waist elastic part, and the non-skin sheet are joined via the joint. Both the skin sheet and the non-skin sheet are formed with wrinkles due to the joint row, and the skin sheet floats at the rear edge of the diaper, or the non-skin sheet floats at the rear edge of the diaper. Can be suppressed. Moreover, the touch of the surface which contacts the skin of an infant can be improved by having a skin sheet.

1st area | region R1 may be arrange | positioned in the area | region extended in a longitudinal direction from a leg expansion-contraction part. When producing a disposable diaper, the elastic member constituting the leg stretchable part is continuously extended in the product longitudinal direction, and the elastic member in the extended state is joined to a web (back sheet, exterior sheet, etc.), and the disposable diaper is After the continuous body continuous in the longitudinal direction is manufactured, the continuous body is cut along the product width direction for each individual product length. According to the manufacturing method, by cutting the continuous body, the elastic member that has been stretched contracts in the product longitudinal direction, and only the portion joined in the vicinity of the leg-hole opening remains. In such a manufacturing method, in the region extending in the longitudinal direction from the leg stretchable part, the leg stretchable part is disposed at the time of production, but the leg stretchable part is not disposed in the product state, and the webs sandwiching the leg stretchable part are Not joined.

A region where the skin sheet and the non-skin sheet are not joined because the first region R1 (which does not have a joint portion) having a relatively high stretchability is disposed in a region extending in the longitudinal direction from the leg stretchable portion. Can be fitted to the body to suppress leakage in the region and spillage of SAP from the absorption core.

5th area | region R5 and 4th area | region R4 may be located inside the width direction rather than the outer edge of the absorption core 40a. From the outer edge of the waist elastic part 85 to the inner side in the width direction, the first region R1 having no joint row, the third region R3 having the joint row, the fifth region R5 having no joint row, and the joint A fourth region R4 having a partial row is arranged. Since the area | region with a high expansion / contraction rate and the area | region with a low expansion / contraction rate are arrange | positioned alternately, fitting property can be improved, suppressing overtightening of a wearer.

More specifically, the fit can be improved when the disposable diaper is worn. When wearing the disposable diaper, the wearer's body is placed on the rear waist area of the disposable diaper with the disposable diaper deployed. At this time, the wearer's body is placed so as to cover the entire width of the absorbent core 40a. The wearer pulls the fastening tape in a state where the wearer's body is placed on the entire width of the absorbent core 40a, and tries to stop it in the area around the front waist. At this time, the first region R1 located on the outer side in the width direction than the absorbent core 40a is pulled outward in the width direction and extends. On the other hand, the fourth region R4 and the fifth region R5 located on the inner side in the width direction than the first region R1 are located on the inner side in the width direction with respect to the outer edge of the absorbent core 40a, and the wearer's body pressure is applied. Therefore, it hardly extends in the width direction. In the third region R3, the inner portion in the width direction from the outer edge of the absorbent core 40a does not extend, and the outer portion in the width direction extends from the outer edge of the absorbent core 40a. Therefore, in the waist stretchable part before wearing the disposable diaper and waking up the wearer, a part of the first region R1 and the third region R3 extends, and the other part of the third region R3, the fourth region R4 and the fifth region R5 are hardly extended.

When the wearer is raised after wearing the disposable diaper, the body pressure applied to the absorbent core 40a is reduced. Therefore, the other part of the third region R3, the fourth region R4, and the fifth region R5 are easily expanded and contracted as compared with the state before waking up the wearer. At this time, since the first region R1 of the waist elastic part is already extended and the fourth region R4 is easier to extend than the fifth region R5, the fourth region R4 is pulled and extended by the fifth region R5. As a result, the fourth region R4 of the waist elastic part in a state where the wearer is raised fits the wearer's body with a weak force. Similarly, the third region R3 fits the wearer's body with a weak force. Since the area | region with a comparatively high expansion / contraction rate and the area | region with a comparatively low expansion / contraction rate are provided, fitting property can be improved, suppressing overtightening of a wearer.

The second region R2 may be disposed across the center in the width direction of the disposable diaper. In the center of the wearer's back, the spine is arranged and is recessed on the ventral side from the left and right parts. The concave portion (Michael's rhombus) is a dent of the sacrum, and the second region R2 is disposed in the concave portion. A portion contracted by the second region R2 is disposed in the recessed portion of the wearer. Therefore, it can suppress that a clearance gap produces between the center of a wearer's back, and a disposable diaper, and can prevent more reliably the leak from the site | part which is dented in the back side.

The surface density of the joint in the third region R3 may be higher than the surface density of the joint in the fourth region R4. Since the area of the junction per unit area in the third region R3 is higher than the area of the junction per unit area in the fourth region R4, the junction of the third region R3 is denser than the fourth region R4. Placed in. However, since the stretch rate of the waist stretchable portion in the fourth region is higher than the stretch rate of the waist stretchable portion in the third region, the stretch rate of the waist stretchable portion in the fourth region R4 is that of the third region R3. It becomes higher than the expansion / contraction rate of the waist elastic part. A portion contracted by the fourth region is disposed in the dent in the wearer's sacrum. Therefore, it can suppress that a clearance gap produces between the center of a wearer's back, and a disposable diaper, and can prevent more reliably the leak from the site | part which is dented in the back side.

(5) Modification Next, the disposable diaper which concerns on a modification based on FIG. 5 is demonstrated. FIG. 5 is an enlarged plan view of the rear end edge of the disposable diaper 10A according to the modification. In addition, in the disposable diaper which concerns on a modification, about the structure similar to the disposable diaper of embodiment, description is abbreviate | omitted using a same sign. The disposable diaper 10A according to the modified example has a plurality of third regions R3 and a plurality of fifth regions R5. Therefore, at the rear edge of the disposable diaper, from the center in the width direction to the outer side of the disposable diaper, the fourth region R4 has a relatively low expansion rate of the waist elastic unit 85, and the fifth region R5 has a relatively high expansion rate. The third region R3 having a relatively low expansion rate, the fifth region R5 having a relatively high expansion rate, the third region R3 having a relatively low expansion rate, and the first region R1 having a relatively high expansion rate are arranged in this order. .

Also with the disposable diaper according to the modified example, a ridge extending in the longitudinal direction is formed on the rear end edge of the disposable diaper, and the rear end edge of the disposable diaper is prevented from being lifted, and the back-side fit can be maintained. Moreover, since the unevenness | corrugation can be fitted to a body by the waist expansion-contraction part, the clearance gap by an unevenness | corrugation is not formed and the leak in a wearer's back side can be suppressed. In the disposable diaper according to the modification, the fifth region R5 is disposed on the extension line in the longitudinal direction of the elastic member 81 of the leg side stretchable part 80. Since the joining portion is not arranged on the extension line extending in the longitudinal direction from the elastic member 81, the elastic member 81 is not fixed by the joining portion at the time of manufacturing, and the elastic member 81 can be arranged in a contracted state in the longitudinal direction.

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

Note that the entire content of Japanese Patent Application No. 2015-250041 filed on December 22, 2015 is incorporated herein by reference.

The disposable diaper which can raise the fit nature of the back end edge of a disposable diaper, and can control the leak in a wearer's back side can be provided.

10… Disposable diaper 20… Front waist area 25… Inseam area 30… Back waist area 40… Absorber 40a… Absorbing core 40b… Core wrap 50… Top sheet (sheet material)
60… Exterior sheet (sheet material)
60a ... Back sheet (sheet material)
70… Side flap (sheet material)
85 ... waist elastic part 87 ... joint 87L ... joint row 871 ... center joint 871L ... center joint row 872 ... side joint 872L ... side joint row 90 ... fastening tape L ... longitudinal direction W ... width direction R1 ... first region R2 ... second region R3 ... third region

Claims

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A longitudinal direction from the front waist area to the rear waist area, and a width direction orthogonal to the longitudinal direction;
A pair of fastening tapes extending along the width direction in the rear waistline region and fastened to the front waistline region;
An absorbent core that straddles the crotch region and extends toward at least one of the front waistline region and the back waistline region;
A waist elastic part that is arranged at the rear edge of the disposable diaper and expands and contracts in the width direction,
A sheet material arranged to overlap the waist elastic part,
A joint part that joins the waist elastic part and the sheet material with a joint line arranged at intervals in the longitudinal direction; and
The joint row is a disposable diaper, a plurality of which are arranged at intervals in the width direction,
A first region extending from both outer edges of the waist stretchable portion toward the inside in the width direction and not having the joint portion;
A second region extending rearward from the front edge of the waist elastic part and not having the joint;
A third region located on the inner side in the width direction than the first region and located rearward of the second region, and having the joint row,
The said 1st area | region is a disposable diaper located in the outer side of the width direction rather than the said absorption core.
The disposable diaper according to claim 1, wherein a rear end edge of the joint row is arranged at a rear end edge of the disposable diaper.
The disposable diaper according to claim 1 or 2, wherein at least a part of the second region is arranged behind the absorbent core.
The said sheet | seat material contains the skin surface sheet located in the skin opposing surface side of the said waist elastic part, and the non-skin surface sheet located in the non-skin opposing surface side of the said waist elastic part. The disposable diaper according to claim 3.
It is arranged around the leg of the wearer and has a leg stretchable part that stretches in the longitudinal direction,
The disposable diaper according to claim 4, wherein at least a part of the first region is disposed in a region extending in a longitudinal direction from the leg stretchable portion.
A fourth region extending outward in the width direction from the center of the disposable diaper in the width direction inside the third region, and having the joint row;
A fifth region that is located between the third region and the fourth region and does not have the joint,
The disposable diaper according to any one of claims 1 to 5, wherein the fifth region and the fourth region are located on the inner side in the width direction than the outer edge of the absorbent core.
The disposable diaper according to any one of claims 1 to 6, wherein the second region is disposed across the center in the width direction of the disposable diaper.