CN108472171B

CN108472171B - Disposable diaper having a disposable diaper

Info

Publication number: CN108472171B
Application number: CN201680074542.0A
Authority: CN
Inventors: 深山拓也; 坂口智; 山中康弘; 辻井真纪
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2015-12-22
Filing date: 2016-11-21
Publication date: 2021-10-29
Anticipated expiration: 2036-11-21
Also published as: TW201733543A; CN108472171A; JP2017113153A; KR20180098319A; WO2017110336A1; JP6420754B2; TWI716504B

Abstract

A disposable diaper (10) is provided with a front waistline region (20), a rear waistline region (30), a crotch region (25), a pair of fastening tapes (90), an absorbent core (40a), a waistline stretch unit (85) which is arranged at the rear end edge of the disposable diaper and stretches and contracts in the width direction, a sheet which is arranged to overlap the waistline stretch unit, and a joint unit row (87L) in which joint units (87) which join the waistline stretch unit and the sheet are arranged at intervals in the longitudinal direction. The plurality of joint portion rows are arranged with an interval in the width direction. A disposable diaper has: a 1 st region (R1) extending inward in the width direction from both outer edges of the waist stretch units, the 1 st region having no line of bonds; a 2 nd region (R2) extending rearward from the front end edge of the waist stretchable panel, the 2 nd region having no line of joined portions; and a 3 rd region (R3) located on the inner side in the width direction than the 1 st region and located on the rear side of the 2 nd region, the 3 rd region having the joint line. The 1 st region is located further outward in the width direction than the absorbent core.

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

A disposable diaper having an embossed pattern between fastening tapes in a rear waistline region has been disclosed. The ginning rows extend in the longitudinal direction and are arranged in plurality at intervals in the width direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2004-90902

Disclosure of Invention

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, in the disposable diaper of patent document 1, wrinkles are formed by the embossed rows. Since the irregularities due to the wrinkles are formed between the fastening tapes, a gap due to the irregularities is formed between the rear end edge of the disposable diaper and the body. Since a gap is formed between the rear end edge of the disposable diaper and the body, leakage of excrement may occur on the back side of the wearer.

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

The disposable diaper (disposable diaper 10) of the present disclosure has: a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and a crotch region (crotch region 25) located between the front waistline region and the rear waistline region; a longitudinal direction (longitudinal direction L) from the front waistline region toward the rear waistline region, and a width direction (width direction W) orthogonal to the longitudinal direction; a pair of fastening tapes (fastening tapes 90) extending in the width direction in the rear waistline region and fastened to the front waistline region; an absorbent core (absorbent core 40a) spanning the crotch region and extending toward at least one of the front waistline region and the back waistline region; a waist stretchable unit (waist stretchable unit 85) which is disposed at a rear end edge of the disposable diaper and is stretchable in the width direction; a sheet disposed so as to overlap the waist stretchable portion; and a joint line (joint line 87L) in which joints (joints 87) for joining the waist elastics and the sheet are arranged at intervals in the longitudinal direction, and a plurality of the joint lines are arranged at intervals in the width direction, the disposable diaper including: a 1 st region (1 st region R1) extending from both outer edges of the waist stretchable panel inward in the width direction, the 1 st region not having the line of joined portions; a 2 nd region (a 2 nd region R2) extending rearward from the front end edge of the waist stretchable panel, the 2 nd region not having the line of joined portions; and a 3 rd region (a 3 rd region R3) located inward in the width direction of the 1 st region and rearward of the 2 nd region, the 3 rd region having the line of joined portions, the 1 st region being located outward in the width direction of the absorbent core.

According to the present disclosure, the fitting property of the rear end edge of the disposable diaper can be improved, and leakage on the back side of the wearer can be suppressed.

Drawings

Fig. 1 is a developed plan view of the disposable diaper of the present embodiment.

Fig. 2 is a cross-sectional view of the disposable diaper taken along line F1-F1 shown in fig. 1.

Fig. 3 is a cross-sectional view of the disposable diaper taken along line F2-F2 shown in fig. 1.

Fig. 4 is an enlarged developed plan view of the rear end edge of the disposable diaper shown in fig. 1.

Fig. 5 is an enlarged developed plan view of the rear end edge of the disposable diaper according to the modification.

Detailed Description

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, the drawings are schematic, and it should be noted that the scale of each dimension and the like may be different from those in reality.

Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings also include portions having different dimensional relationships and ratios from each other.

(1) Overall schematic structure of disposable diaper

Fig. 1 is a developed plan view of a disposable diaper 10 of the present embodiment. Fig. 2 is a cross-sectional view of the disposable diaper taken along line F1-F1 shown in fig. 1. Fig. 3 is a cross-sectional view of the disposable diaper taken along line F2-F2 shown in fig. 1. Fig. 4 is an enlarged plan view of the rear end edge of the disposable diaper shown in fig. 1. The developed views shown in fig. 1 and 4 are views in which the elastic members of the leg stretch units 75 and the leg-side stretch units 80 are stretched to a state where no wrinkles are formed in the top sheet 50, the side flaps 70, and the like constituting the disposable diaper.

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 that contacts the front waistline portion (abdomen portion) of the wearer. The back waistline region 30 is a portion that contacts the back waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the rear waistline region 30.

The disposable diaper 10 is formed with a pair of leg openings 35. The leg openings 35 are provided at the side end portions in the width direction of the disposable diaper, and are portions arranged along the leg circumferences 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 toward the rear 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 absorbent core 40a and a core wrap 40 b. The absorbent core 40a extends from the crotch region 25 toward at least either one of the front waistline region 20 and the back waistline region 30 across the crotch region 25.

As in the case of a conventional disposable diaper, the absorbent core 40a can be suitably configured using a known member or material such as ground pulp or a super absorbent polymer. The absorbent core 40a is wrapped by a sheet-like core wrap 40 b. The core clad 40b is a sheet that covers the absorbent core 40 a. The rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b substantially coincide with each other, and the front end edge of the absorbent core 40a and the front end edge of the core wrap 40b substantially coincide with each other. More specifically, the distance between the rear end edge of the absorbent core 40a and the rear end edge of the core cladding 40b is 5mm or less, and the distance between the front end edge of the absorbent core 40a and the front end edge of the core cladding 40b is 5mm or less.

As shown in fig. 4, the absorbent core 40a is formed with a low basis weight region 110 in which the basis weight of the absorbent material is lower than the basis weight of the absorbent material in other portions of the absorbent core 40 a. The low basis weight region 110 is located at the center in the width direction of the rear end edge of the absorbent core 40 a. The width of the low basis weight region 110 in the width direction W increases toward the rear end edge of the absorbent core 40 a. More specifically, the low basis weight region 110 has a wedge shape in a plan view of the disposable diaper 10. When the waist stretchable portion 85 described later is contracted in the width direction, the low-basis-weight region 110 is more likely to contract than the surroundings, and the rear end portion of the absorbent core 40a is formed into a cup shape extending along the hip of the wearer.

A liquid-permeable top sheet 50 is provided on the front side (skin-facing side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back surface side (non-skin-facing surface side) of the absorber 40. An outer sheet 60 is provided on the back surface side of the base sheet 60 a. The front end edge of the backsheet is positioned rearward of the front end edge of the disposable diaper, and the rear end edge of the backsheet is positioned forward 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. The side flaps 70 are arranged on the outer side in the width direction of the absorber 40 across the front waistline region 20, the crotch region 25, and the rear waistline region 30. The side flaps 70 are formed of one or more stacked multiple sheets of nonwoven fabric. The side flaps 70 are positioned closer to the skin-facing surface side than the absorbent core 40a, and extend further outward in the width direction than the absorbent core 40 a.

The side flap 70 is provided with a pair of leg stretching portions 75, and the leg stretching portions 75 are disposed on the inner side in the width direction than the leg opening 35 and are stretchable in the longitudinal direction L. The leg stretching portions 75 are respectively disposed at positions inward in the width direction of the left and right leg openings. The leg stretch unit 75 is made of a stretchable sheet, a rubber band, or the like. The leg stretch units 75 of the present embodiment are formed of 3 rubber bands on the left and right, respectively, but may be formed of a stretchable sheet made of a nonwoven fabric. The leg stretching portion 75 may be configured to be capable of stretching the leg opening 35 in the longitudinal direction.

The position of the leg stretch unit 75 in the width direction may be changed. Specifically, the interval between the inner ends of the pair of right and left leg stretch units in the product widthwise direction W is preferably increased as going from the crotch region 25 toward the front waistline region 20, and is preferably increased as going from the crotch region 25 toward the rear waistline region 30. By arranging the leg stretch units in a shape that is narrow in the crotch portion and widened toward the front and rear waistlines, the leg stretch units can be made to follow the lines of the body more, and the leg stretch units can be appropriately arranged around the legs of the wearer in an extended manner.

A pair of leg-side stretchable portions 80 extending in the longitudinal direction L are provided on the inner sides in the width direction of the pair of leg stretchable portions 75. The leg side stretchable component 80 includes an elastic member 81 disposed at the inner end of the side flap 70 in the width direction and stretchable in the longitudinal direction, and the leg side stretchable component 80 is a stretchable gather having a standing property.

The disposable diaper 10 further includes a crotch stretch unit 200, and the crotch stretch unit 200 is disposed in a region overlapping with the absorber in the crotch region 25. The crotch stretch unit 200 is configured to be able to maintain a flat shape in a part of the crotch region 25 when the disposable diaper is worn, as compared with other parts of the absorber 40. The crotch stretch unit 200 is configured to be stretchable at least in the longitudinal direction L or the width direction W.

The absorbent core 40a in the crotch region 25 is formed with a 1 st notch 115 and a 2 nd notch 125. The 1 st notch 115 and the 2 nd notch 125 are slits formed in the absorbent core 40 a. The slits are portions where no absorbent material is present. The 1 st notch 115 and the 2 nd notch 125 are each a notch shape extending from the outer edge of the absorbent core 40a toward the inside in the width direction.

The pair of fastening tapes 90 extend in the width direction W in the rear waistline region 30, and the disposable diaper 10 is held on the body of the wearer by fixing the fastening tapes 90 to the non-skin-facing surface of the front waistline region 20. The fastening tape 90 is attached to a region of the side flap 70 corresponding to the rear waistline region 30. The hook and loop fastener 90 includes a base sheet 91 coupled to the side flap 70 and a hook sheet 92 provided with a plurality of engaging hooks (not shown) and fixed to the base sheet 91. The hook piece 92 is a region provided with an engaging hook.

The target portions 95 are provided on the surface of the outer sheet 60 of the front waistline region 20 on the non-skin-facing side. The target portion 95 is configured to be hooked by an engagement hook of the hook and loop fastener 90, and functions as a loop of a hook-and-loop engagement system. As the target portion 95, for example, a hot air nonwoven fabric can be used. The disposable diaper may not have the target portion, and the fastening tape 90 may be configured to be fixed to the outer sheet 60 in the front waistline region 20.

The disposable diaper 10 has a waist stretchable unit stretchable in the width direction. The waist stretchable unit 85 is disposed in the rear waist region. The waist stretchable unit 85 is disposed between the pair of fastening tapes 90 in the width direction, and is configured to contract the fastening tapes 90 in the width direction. The front end edge of the waist stretchable panel 85 is curved so that the center in the width direction is recessed rearward.

In the present embodiment, the waist stretchable unit is made of a stretchable sheet, and for example, a stretchable film, a stretchable nonwoven fabric, and polyurethane can be used. The waist stretchable section 85 is preferably made of a stretchable nonwoven fabric. The waist stretchable portion 85 made of a stretchable nonwoven fabric is easier to maintain the air permeability of the waist of the infant than the waist stretchable portion made of a stretchable film. The waist stretchable unit is a portion substantially stretchable in the width direction, and is a concept other than a portion where the stretchable sheet is arranged in a state where the stretchable force is not exerted. Therefore, the outer edge of the waist stretchable panel described later is not the outer edge of the stretchable sheet but the outer edge of the stretchable portion. In the present embodiment, the waist stretchable panel has a basis weight of 20g/m²～45g/m²The stretch film of (1). However, the waist stretchable unit 85 may be formed of another structure such as a plurality of rubber bands. The waist stretchable unit is stretched to a predetermined magnification with respect to the length in a non-stretched state (natural state), and then is bonded to the chassis 60a with a hot melt adhesive, heat treatment, or the like. The waist stretchable unit will be described in detail later.

Further, the disposable diaper is provided with a plurality of joining portions for joining the waist stretchable panel and the sheet. The joining portion 87 joins the waist stretchable panel 85 and the sheet material overlapping the waist stretchable panel 85. The joint is described in detail later.

The outer edge of the rear waistline region of the outer sheet is positioned further outward in the width direction than the outer edge of the front waistline region of the outer sheet. The outer side edge of the outer sheet is the outer side edge of the disposable diaper in the region other than the fastening tape. The length of the outer sheet in the width direction of the rear waistline region is longer than the length of the outer sheet in the width direction of the front waistline region. Therefore, when the fastening tape is fastened to the front waistline region, the outer edge of the rear waistline region is easily pulled toward the front side of the body of the wearer. By pulling the outer edge of the rear waistline region toward the front side of the body of the wearer, the waistline stretch unit is extended, and the rear end edge of the disposable diaper can be fitted to the body of the wearer.

The width-directional length of the outer sheet increases from the crotch region toward the rear end edge of the disposable diaper. More specifically, the length of the outer sheet in the width direction in the region where the pair of fastening tapes are arranged is longer than the length of the outer sheet in the width direction in the region forward of the low basis weight region 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 easily positioned on the outer side in the width direction than the absorbent core even when the waist stretchable portion is contracted. The absorbent core is the area where the wearer is positioned when worn. By disposing the hook and loop fastener on the outer side in the width direction of the absorbent core, the hook and loop fastener can be prevented from being disposed between the body of the wearer and the absorbent core, and irritation of the skin by the hook and loop fastener can be suppressed.

(2) Structure of waist stretch unit and joint unit

The waist stretchable unit 85 extends from the center in the width direction of the disposable diaper toward both outer sides in the width direction, and is made of a stretchable sheet extending in the width direction. The waist stretchable unit of the present embodiment is configured to stretch in the width direction, but may be configured to stretch in the width direction and the longitudinal direction.

The rear end edge of the waist stretchable panel 85 coincides with the rear end edge of the disposable diaper. The front end edge of the waist stretch unit 85 is positioned on the front side of the rear end edge of the absorbent core 40a and on the front side of the rear end edge of the core wrap 40 b. At least a part of the waist stretch unit 85 overlaps the absorbent core 40a in a plan view of the disposable diaper. The waist stretchable panel 85 extends beyond the rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b to the front side of the rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40 b. The outer edge of the waist stretch unit 85 is positioned inward in the width direction from the inner edge (inner end in the width direction) of the fastening tape. The waist stretchable portion 85 and the fastening tape 90 are separated in the width direction. By separating the waist stretching portion 85 and the fastening tape 90 in the width direction, the wearer can easily grasp the amount of extension of the waist stretching portion, and can easily operate the fastening tape.

The waist stretchable unit is positioned on the non-skin-facing surface side of the absorbent core 40 a. In the present embodiment, the waist elastics are disposed between the outer sheet 60 and the chassis 60 a. The position of the waist stretch unit is not particularly limited. Further, the absorbent core may be disposed between the side flaps 70 and the backsheet 60a or the outer sheet 60 in a region where the absorbent core is not disposed. In the present embodiment, the skin-facing surface sheet positioned on the skin-facing surface side of the waist stretch unit includes the topsheet 50, the side flaps 70, and the backsheet 60 a. The non-skin surface sheet positioned on the non-skin-facing surface side of the waist stretch unit includes an outer sheet 60.

A joint portion is formed in a region where the waist stretchable portion is arranged. The joint portions are formed in the regions where the waist elastics 85 are arranged. The joining portion 87 joins the waist elastics 85 and the sheet overlapping the waist elastics 85 by heat sealing. The joint portion may be a portion joined by heat sealing, or may be a portion joined by another welding method such as ultrasonic welding or an adhesive.

The sheet materials are specifically a topsheet 50, a side flap 70, a backsheet 60a and an outer cover 60. In the region where the topsheet 50 and the waist elastics overlap, the joining section joins the topsheet 50, the waist elastics, the backsheet 60a, and the outer sheet 60. In the region where the side flap 70 and the waist elastics overlap, the joining section joins the side flap 70, the waist elastics, the backsheet 60a, and the outer sheet 60.

The joint 87 is in a dot shape when viewed from above the disposable diaper. The joint formed by heat sealing is made thin, and the air permeability of the part is reduced. By arranging the joint portions in a dot shape, air permeability can be secured in the peripheral region of the joint portions, and a decrease in air permeability of the waist can be suppressed. The engagement portions 87 are aligned along the longitudinal direction L. The joining portions include a central joining portion 871 disposed in a 4 th region R4 described later and side joining portions 872 disposed in a 3 rd region R3 described later. The center joining portions 871 are displaced in the longitudinal direction with respect to the center joining portions 871 adjacent in the width direction. That is, the central engagement portion 871 is arranged in a zigzag shape. The portion provided with the joint portion is higher in rigidity than the portion not provided with the joint portion, and the stretchability of the waist stretchable portion is reduced. By arranging the center joining portions 871 in a zigzag shape, it is possible to suppress a decrease in stress in the width direction and improve rigidity in the longitudinal direction, as compared with a structure in which the center joining portions 871 are arranged continuously.

The side joining portions 872 are aligned with the longitudinal positions of the side joining portions 872 adjacent in the width direction. The center joining portion 871 and the side joining portions 872 are disposed with a gap in the longitudinal direction L and the width direction W. The longitudinal interval D1 of the center joining portion 871 is larger than the longitudinal interval D2 of the side joining portions 872. The widthwise interval D3 of the center joining portion 871 is larger than the widthwise interval D4 of the side joining portions 872. The longitudinal interval D1 of the center joint portion 871 coincides with the width interval D3 of the center joint portion. The longitudinal interval D2 of the side joint portion coincides with the width interval D4 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. The plurality of joint portion rows 87L are provided with a space in the width direction. The front end edge of the joint portion row 87L coincides with the rear end edge of the 2 nd region R2. The rear end edge of the joint portion row 87L is disposed at the rear end edge of the disposable diaper. The joint portion row 87L includes a center joint portion row 871L in which the center joint portions 871 are arranged with a space therebetween, and a side joint portion row 872L in which the side joint portions 872 are arranged with a space therebetween. A plurality of center joint portion rows 871L are arranged with an interval in the width direction. The widthwise interval of the center joining portion rows 871L is larger than the widthwise interval of the side joining portion rows 872L.

The disposable diaper includes a pair of 1 st regions R1 extending inward in the width direction from both outer edges of the waist elastics 85, a 2 nd region R2 extending rearward from the front end edge of the waist elastics 85, a plurality of 3 rd regions R3 located inward in the width direction from the 1 st region R1 and located rearward from the 2 nd region R2, a 4 th region R4 extending outward in the width direction from the center of the disposable diaper in the width direction at a position inward in the width direction from the 3 rd region R3, and a plurality of 5 th regions R5 located between the 3 rd region R3 and the 4 th region R4. In fig. 4, the 1 st region R1, the 2 nd region R2, the 3 rd region R3, the 4 th region R4, and the 5 th region R5 are indicated by different oblique lines. The disposable diaper of the present embodiment may have at least the 1 st region R1, the 2 nd region R2, and the 3 rd region R3.

The 1 st region R1 is disposed over the entire length of the outer edge of the waist stretch unit 85 and extends inward in the width direction from the outer edge. The inner edge of the 1 st region R1 coincides with the outer edge of the 2 nd region R2, and coincides with the outer edge of the 3 rd region R3 (the outer edge of the 3 rd region R3 located outermost in the width direction in a configuration in which a plurality of the 3 rd regions R3 are arranged). The 1 st region R1 is located further outward in the width direction than the outer edge of the absorbent core 40 a. The rear end edge of the 1 st region R1 coincides with the rear end edge of the waist stretchable panel 85. The front end edge of the 1 st region R1 coincides with the front end edge of the waist stretchable panel 85. The 1 st region R1 is located further outward in the width direction than the absorbent core 40 a. Further, the engaging portion 87 is not provided in the 1 st region R1. Since the joint portions 87 are not provided in the 1 st region R1, the stretchability of the waist stretchable panel 85 in the 1 st region R1 is maintained.

At least a part of the 1 st region R1 is disposed in a region extending in the longitudinal direction from the leg stretching portion 75. The region extending in the longitudinal direction from the leg stretch unit 75 is a region sandwiched between two extension lines extending in the longitudinal direction from the rubber bands located on both outer sides in the width direction out of the 3 rubber bands.

The 2 nd region R2 is disposed between the pair of 1 st regions R1. The 2 nd 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 end edge of the 2 nd region R2 coincides with the front end edge of the 3 rd region R3, with the front end edge of the 4 th region R4, and with the front end edge of the 5 th region R5. The front end edge of the 2 nd region R2 coincides with the front end edge of the waist stretchable panel 85. At least a part of the 2 nd region R2 overlaps with the region of relatively high basis weight of the absorbent core 40a (region other than the low basis weight region) and the low basis weight region 110 of the absorbent core 40 a. At least a part of the 2 nd region R2 including the rear end edge of the 2 nd region R2 is positioned rearward of the absorbent core 40 a. The outer edge of the 2 nd region R2 is located further outward in the width direction than the absorbent core 40 a. The joint 87 is not provided in the 2 nd region R2. Since the joint portions 87 are not provided in the 2 nd region R2, the stretchability of the waist stretchable section 85 in the 2 nd region R2 is maintained.

The 3 rd region R3 extends inward in the width direction from the inner edge of the 1 st region R1. The inner edge of the 3 rd region R3 coincides with the outer edge of the 5 th region R5. The 3 rd region R3 spans the outer side edge of the absorbent core 40a in the width direction. The rear end edge of the 3 rd region R3 coincides with the rear end edge of the waist stretchable panel 85. The front end edge of the 3 rd region R3 coincides with the rear end edge of the 2 nd region R2. The 3 rd region R3 is located rearward of the absorbent core 40 a. The 3 rd region R3 is provided with a side joint portion row 872L. The waist stretchable portion 85 is joined to the sheet via the side joining portions 872, and the stretchability is reduced in the side joining portions 872. Therefore, the stretchability of the waist stretchable section 85 in the 3 rd region R3 is lower than the stretchability of the regions (the 1 st region R1, the 2 nd region R2, and the 5 th region R5) where no joint is provided.

The 4 th region R4 is disposed between the pair of 5 th regions R5. The outer edge of the 4 th region R4 coincides with the inner edge of the 5 th region R5. The rear end edge of the 4 th region R4 coincides with the rear end edge of the waist stretchable panel 85. The front end edge of the 4 th region R4 coincides with the rear end edge of the 2 nd region R2. The 4 th region R4 is located rearward of the absorbent core 40 a. The 4 th region R4 is provided with a center joint portion row 871L. The stretchability of the waist stretchable section 85 in the 4 th region R4 is lower than the stretchability of the regions (the 1 st region R1, the 2 nd region R2, and the 5 th region R5) where no joint is provided.

The area of the central joining portion 871 is larger than the area of the side joining portions 872. The 3 rd region R3 is provided with side joint portions 872, and the 4 th region R4 is provided with a center joint portion 871. The area of the joint per unit area of the 3 rd region R3 is larger than the area of the joint per unit area of the 4 th region R4. That is, the area density of the junctions of the 3 rd region R3 is higher than the area density of the junctions of the 4 th region R4.

The 5 th region R5 is disposed between the pair of 3 rd regions R3. The rear end edge of the 5 th region R5 coincides with the rear end edge of the waist stretchable panel 85. The front end edge of the 5 th region R5 coincides with the rear end edge of the 2 nd region R2. The 5 th region R5 is located rearward of the absorbent core 40 a. The 4 th region R4 and the 5 th region R5 are located inward in the width direction from the outer edge of the absorbent core 40 a. The joint 87 is not provided in the 5 th region R5. Since the joint portions 87 are not provided in the 5 th region R5, the stretchability of the waist stretchable portion 85 in the 5 th region R5 is maintained.

The waist stretchable panel 85 has a region with a high elongation and a region with a low elongation. Specifically, a high elongation region having a relatively high elongation is disposed at the center in the width direction of the waist stretchable panel 85, a low elongation region having a relatively low elongation is disposed at the outer side in the width direction of the high elongation region, and a high elongation region is disposed at the outer side in the width direction of the low elongation region. The outer end edge of the high elongation region at the center in the width direction is the outer end edge of the 5 th region. That is, the 4 th region and the 5 th region are high elongation regions. The outer edge of the low elongation region is the outer edge of the 3 rd region. That is, the 3 rd region is a low elongation region. Further, the 1 st region is a high elongation region.

The stretch ratio of the waist stretchable portion 85 changes depending on the difference in the stretch ratio of the waist stretchable portion and the presence or absence of the joint portion 87. Since the 1 st and 5 th regions are high stretch regions and are not provided with a joint portion, the waist stretchable portion 85 has the highest stretch ratio. The 4 th region is a high stretch region, but is provided with a joint portion, and the stretchability of the waist stretchable portion 85 is lower than that of the 1 st region and the 5 th region because the joint portion lowers the stretchability. Further, since the 3 rd region is a low elongation region and is provided with a joint portion, the expansion and contraction rate is lower than that of the 4 th region because the joint portion causes a decrease in expansion and contraction rate.

Further, since the 2 nd region is not provided with the joint portions, the stretch ratio changes only due to the difference in the stretch ratio of the waist stretchable portion. Specifically, the center in the width direction (the range in the width direction of the 4 th region) is a high elongation region, and the expansion and contraction ratio is high. On the other hand, the widthwise outer side (the widthwise range of the 3 rd region and the 5 th region) is a low elongation region, and the expansion and contraction ratio is low.

(3) Method for manufacturing disposable diaper

Next, an example of the method for manufacturing the absorbent article of the present embodiment will be described. In addition, a conventional method can be used as a method not described in this embodiment. The following manufacturing method is an example, and the present invention may be manufactured by other manufacturing methods. The method for manufacturing the absorbent article includes at least a component forming step, a component mounting step, a joint forming step, a leg-surrounding forming step, and a cutting step.

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

In the component mounting step, the components constituting the disposable diaper 10, such as the stretchable sheet constituting the waist stretchable section 85, another fabric sheet such as the fabric sheet constituting the top sheet, the leakproof sheet, the absorber, and the leg stretchable section 75, are mounted on the fabric sheet constituting the back sheet. In the component mounting step, the stretchable sheet constituting the waist stretchable unit 85 is disposed. The disposable diaper is formed into a continuous body which is continuous in the longitudinal direction by placing the component in the component placement step.

Further, as a method of changing the elongation of the waist stretchable panel 85, for example, the following method can be cited. The waist elastics 85 are stretched in the width direction by gears before the waist elastics 85 are attached to the chassis 60a or the like. When the gear is used for stretching, the gear stretching in a region (for example, 2 nd region) where the elongation is reduced is weakened. Enhancing gear stretching in the areas of increased elongation (e.g., areas 1 and 3). The strength of gear extension can be adjusted by changing the depth of the convex part of the gear, the pitch of the convex part of the gear, and the number of times of gear extension. The elongation of the more strongly stretched region becomes relatively high, and the elongation of the less strongly stretched region becomes relatively low.

In the joint forming step, the joint is formed by heat sealing.

In the leg-surrounding forming step, the top sheet 50, the exterior sheet 60, and the bottom sheet 60a are cut. Thereby, the leg openings 35 arranged around the legs of the wearer are formed. The joint portion forming step may be performed after the leg hole forming step.

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 into a size of one product along the width direction W. Thus, the disposable diaper 10 is manufactured by arranging the front waist stretching units in the front waist region 20 and the waist stretching units in the rear waist region 30.

(4) Action and Effect

Since the 3 rd region R3 has a relatively high stiffness portion formed in the longitudinal direction by the joint line, and the region in which the joint line is arranged is contracted in the width direction by the waist stretching portion 85, a plurality of gathers extending in the longitudinal direction are provided at intervals in the width direction. Since the wrinkles extending in the longitudinal direction are formed, the wrinkles extending in the width direction are not easily formed. When the wrinkles extending in the width direction are formed, a bending start point extending in the width direction is formed, and the rear end edge of the diaper may be lifted up to cause leakage of excrement. However, since wrinkles extending in the width direction are not easily formed, the rear end edge of the diaper can be suppressed from lifting.

Further, since the wrinkles 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 curve of the waist. In addition, although the irregularities are formed by the gathers extending in the longitudinal direction, since the irregularities can be attached to the body by the waist stretchable and contractible portion 85, no gap is formed by the irregularities, and leakage on the back side of the wearer can be suppressed. Further, since the waist stretchable and contractible portion is disposed at the rear end edge of the disposable diaper, the rigidity of the rear end edge of the disposable diaper can be increased, and the rear end edge of the disposable diaper can be prevented from being accidentally rolled up.

The 1 st region R1 located on the widthwise outer side of the absorbent core 40a is disposed at a position corresponding to the lumbar bone of the side portion of the wearer. Since the 1 st region R1 has no joint line and the stretching force of the waist stretchable panel is maintained, the stretching force is higher than that of the 3 rd region R3 having a joint line. The first region R1 strongly fits to the lumbar bones of the side portions of the wearer, thereby improving the fit of the waist. The gap between the body and the disposable diaper can be reduced, and leakage of excrement can be suppressed.

Since the 2 nd region R2 does not have the joint 87 and maintains the stretching force of the waist stretchable panel 85, the stretching force is higher than that of the 3 rd region R3 having the joint row. The 2 nd region R2 is relatively easy to stretch and contract, and can absorb the deformation from the absorbent core 40a side by the 2 nd region R2, and suppress the propagation of the deformation of the absorbent core 40a to the 3 rd region R3 and the rear end edge of the disposable diaper. Therefore, the fitting property of the rear end edge of the disposable diaper can be maintained.

The rear end edge of the joint portion row 87L is preferably disposed at the rear end edge of the disposable diaper. By making the gathers extending in the longitudinal direction reach the rear end edge of the disposable diaper, it is difficult to form a fold starting point extending in the width direction at the rear end edge of the disposable diaper or the vicinity thereof. Therefore, the rear end edge of the disposable diaper can be prevented from being lifted by the folding start point extending in the width direction.

At least a part of the 2 nd region R2 is preferably arranged rearward of the absorbent core 40 a. At least a part of the 2 nd region R2 is disposed between the 3 rd region R3 and the absorber. The region located rearward of the absorbent core 40a is not deformed together with the absorbent body, and the deformation of the absorbent body is not easily transmitted directly. The 2 nd region R2 can absorb the deformation occurring from the absorbent core 40a side, and the propagation of the deformation of the absorbent core 40a to the 3 rd region R3 can be effectively suppressed.

The sheet joined to the waist stretching portion by the joining portion preferably includes a skin-facing sheet (topsheet 50, side flaps 70, and backsheet 60a) positioned on the skin-facing surface side of the waist stretching portion, and a non-skin-facing sheet (outer sheet 60) positioned on the non-skin-facing surface side of the waist stretching portion. The skin surface sheet, the waist-stretching portion, and the non-skin surface sheet are joined together by a joining portion. Wrinkles caused by the rows of the joint portions are formed on both the skin-facing sheet and the non-skin-facing sheet, and the skin-facing sheet can be prevented from lifting at the rear edge of the diaper, or the non-skin-facing sheet can be prevented from lifting at the rear edge of the diaper. Further, by having the skin surface sheet, the skin touch feeling of the surface in contact with the skin of the infant can be improved.

The 1 st region R1 is preferably disposed in a region extending in the longitudinal direction from the leg stretching portion. In the production of a disposable diaper, an elastic member constituting a leg stretch unit is stretched in a product longitudinal direction in a continuous state, and the stretched elastic member is joined to a fabric sheet (a backsheet, an outer sheet, or the like) to produce a continuous body of the disposable diaper in the longitudinal direction. In this manufacturing method, the continuous body is cut, whereby the elastic member in an extended state contracts in the product longitudinal direction, and only the portion joined to the vicinity of the leg hole opening portion remains. In this manufacturing method, the leg stretch units are disposed in the regions extending in the longitudinal direction from the leg stretch units during manufacturing, but the leg stretch units are not disposed in the product state, and the fabric pieces sandwiching the leg stretch units are not joined to each other.

Since the 1 st region R1 having relatively high stretchability (having no joint) is disposed in the region extending in the longitudinal direction from the leg stretch units, the region where the skin-side sheet and the non-skin-side sheet are not joined can be attached to the body, and leakage of SAP from this region and overflow of SAP from the absorbent core can be suppressed.

The 5 th region R5 and the 4 th region R4 are preferably located further inward in the width direction than the outer edge of the absorbent core 40 a. The 1 st region R1 having no bond line, the 3 rd region R3 having a bond line, the 5 th region R5 having no bond line, and the 4 th region R4 having a bond line are arranged from the outer edge of the waist stretch unit 85 toward the inside in the width direction. Since the regions having a high stretch ratio and the regions having a low stretch ratio are alternately arranged, fit can be improved while suppressing excessive tightening of the wearer.

More specifically, the fitting property can be improved when the disposable diaper is worn. When the disposable diaper is worn, the body of the wearer is placed in the rear waistline region of the disposable diaper in a state where the disposable diaper is unfolded. At this time, the body of the wearer is placed in such a manner as to cover the entire width of the absorbent core 40 a. 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 attempts to fix it to the front waistline region. At this time, the 1 st region R1 located on the widthwise outer side of the absorbent core 40a is stretched and elongated outward in the widthwise direction. On the other hand, the 4 th region R4 and the 5 th region R5 located inward in the width direction from the 1 st region R1 are located inward in the width direction from the outer edge of the absorbent core 40a, and are hardly stretched in the width direction due to the body pressure of the wearer. In the 3 rd region R3, the portion on the inner side in the width direction than the outer edge of the absorbent core 40a does not extend, and the portion on the outer side in the width direction than the outer edge of the absorbent core 40a extends. Therefore, in the waist stretchable panel in a state before the disposable diaper is worn and the wearer is lifted, a part of the 1 st region R1 and the 3 rd region R3 is stretched, and the other part of the 3 rd region R3, the 4 th region R4, and the 5 th region R5 are hardly stretched.

When the wearer is raised after wearing the disposable diaper, the body pressure applied to the absorbent core 40a is reduced. Therefore, the other portions of the 3 rd region R3, the 4 th region R4, and the 5 th region R5 are more easily stretched than the state before the wearer stands up. At this time, since the 1 st region R1 of the waist stretchable and contractible portion has been stretched and the 4 th region R4 is easily stretched as compared with the 5 th region R5, the 4 th region R4 is stretched and stretched by the 5 th region R5. As a result, the 4 th region R4 of the waist stretching unit in the standing state of the wearer is fitted to the body of the wearer with a weak force. Similarly, the 3 rd region R3 is also attached to the body of the wearer with a weak force. Since the region having a relatively high stretch ratio and the region having a relatively low stretch ratio are provided, fit can be improved while excessive tightening of the wearer is suppressed.

The 2 nd region R2 is preferably disposed across the center of the disposable diaper in the width direction. The spine is disposed in the center of the back of the wearer and is recessed more ventrally than the left and right parts. The recessed portion (the mie-diamond-shaped pit) is a recess of a lumbar vertebra portion, and the 2 nd region R2 is disposed in the recessed portion. A portion contracted by the 2 nd region R2 is arranged in a recessed portion of the wearer. Therefore, it is possible to prevent a gap from being generated between the center of the back of the wearer and the disposable diaper, and to more reliably prevent leakage from the recessed portion on the back side.

It is preferable that the area density of the junction of the 3 rd region R3 is higher than that of the junction of the 4 th region R4. Since the area of the joint per unit area in the 3 rd region R3 is larger than the area of the joint per unit area in the 4 th region R4, the joints of the 3 rd region R3 are arranged relatively closely to the 4 th region R4. However, since the elongation of the waist stretchable panel of the 4 th region is higher than that of the 3 rd region, the stretchability of the waist stretchable panel of the 4 th region R4 is higher than that of the 3 rd region R3. A region contracted by the 4 th region is disposed in a recess of a lumbar vertebra portion of a wearer. Therefore, it is possible to prevent a gap from being generated between the center of the back of the wearer and the disposable diaper, and to more reliably prevent leakage from the recessed portion on the back side.

(5) Modification example

Next, a disposable diaper according to a modification will be described with reference to fig. 5. Fig. 5 is an enlarged plan view of the rear end edge of the disposable diaper 10A according to the modification. In the disposable diaper of the modified example, the same components as those of the disposable diaper of the embodiment are denoted by the same reference numerals, and the description thereof is omitted. The disposable diaper 10A of the modification has a plurality of 3 rd regions R3 and a plurality of 5 th regions R5. Therefore, at the rear end edge of the disposable diaper, the 4 th region R4 with a relatively low expansion ratio, the 5 th region R5 with a relatively high expansion ratio, the 3 rd region R3 with a relatively low expansion ratio, the 5 th region R5 with a relatively high expansion ratio, the 3 rd region R3 with a relatively low expansion ratio, and the 1 st region R1 with a relatively high expansion ratio of the waist stretchable unit 85 are arranged in this order from the center of the disposable diaper in the width direction toward the outside.

With the disposable diaper according to this modification, wrinkles extending in the longitudinal direction are formed at the rear end edge of the disposable diaper, and the rear end edge of the disposable diaper is prevented from lifting up, and the back-side attachment is maintained. Further, since the irregularities can be fitted to the body by the waist stretchable portion, no gap due to the irregularities is formed, and leakage on the back side of the wearer can be suppressed. In the disposable diaper of the modified example, the 5 th region R5 is disposed on the extension line in the longitudinal direction of the elastic member 81 of the leg side stretch unit 80. Since the joint portion is not disposed on the extension line extending in the longitudinal direction from the elastic member 81, the elastic member 81 can be disposed in a state of being contracted in the longitudinal direction without being fixed by the joint portion at the time of manufacturing.

As described above, the contents of the present invention are disclosed by the embodiments of the present invention, but the discussion and the drawings forming a part of the disclosure should not be construed as limiting the present invention. Various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art in light of this disclosure. Accordingly, the scope of the present invention is to be determined only by the technical features of the proper claims that follow from the above description.

The entire contents of Japanese patent application No. 2015-250041 filed on 12/22/2015 are incorporated herein by reference.

Industrial applicability

A disposable diaper capable of improving the fit of the rear end edge of the disposable diaper and suppressing leakage on the back side of the wearer can be provided.

Description of the reference numerals

10. A disposable diaper; 20. a front waistline region; 25. a crotch region; 30. a rear waist region; 40. an absorbent body; 40a, an absorbent core; 40b, a core cladding layer; 50. a top sheet (sheet); 60. exterior sheets (sheets); 60a, a backsheet (sheet); 70. side flaps (sheets); 85. a waist-stretching portion; 87. a joint portion; 87L, a joint row; 871. a central joining portion; 871L, a center joint portion row; 872. a side joint part; 872L, side joint part row; 90. a hook and loop fastener; l, the length direction; w, width direction; r1, region 1; r2, region 2; r3, region 3.

Claims

1. A disposable diaper having:

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 waistline region toward the rear waistline region, and a width direction orthogonal to the longitudinal direction;

a pair of fastening tapes extending in the width direction in the rear waistline region and fixed to the front waistline region;

an absorbent core spanning the crotch region and extending toward at least one of the front and back waist regions;

a waist stretchable unit which is disposed at a rear end edge of the disposable diaper and is stretchable in the width direction;

a sheet material that is disposed so as to overlap the waist stretching portion and includes a skin surface sheet positioned on a skin-facing surface side of the waist stretching portion; and

a joint line in which joint portions for joining the waist stretchable panel and the sheet are arranged at intervals in the longitudinal direction,

a plurality of the joint line is arranged with an interval in the width direction, wherein,

the disposable diaper comprises:

a 1 st region extending inward in the width direction from both outer edges of the waist stretchable panel and having no line of the joint portions;

a 2 nd region extending rearward from a front end edge of the waist stretchable panel and having no line of the joint portions; and

a 3 rd region located inward in the width direction from the 1 st region and rearward from the 2 nd region, the 3 rd region having the joint line,

the 1 st region is located further outward in the width direction than the absorbent core,

the waist stretchable unit is disposed on a non-skin-facing surface side of the absorbent core.

2. The disposable diaper according to claim 1,

the rear end edge of the joint line is disposed at the rear end edge of the disposable diaper.

3. The disposable diaper according to claim 1 or 2,

at least a part of the 2 nd region is disposed rearward of the absorbent core.

4. The disposable diaper according to claim 1 or 2,

the sheet further includes a non-skin surface sheet positioned on a non-skin-facing surface side of the waist stretchable portion.

5. The disposable diaper according to claim 4,

the disposable diaper has a leg stretch unit which is disposed around the legs of a wearer and stretches in the longitudinal direction,

at least a part of the 1 st region is disposed in a region extending in the longitudinal direction from the leg stretching portion.

6. The disposable diaper according to claim 1 or 2,

the disposable diaper comprises:

a 4 th region extending from the center of the disposable diaper in the width direction to the outside in the width direction at a position inward in the width direction than the 3 rd region, the 4 th region having the joint line; and

a 5 th region located between the 3 rd region and the 4 th region, the 5 th region not having the joint,

the 5 th region and the 4 th region are located inward in the width direction from the outer edge of the absorbent core.

7. The disposable diaper according to claim 1 or 2,

the 2 nd region is disposed across the center of the width direction of the disposable diaper.

8. The disposable diaper according to claim 1 or 2,

the disposable diaper comprises:

a 4 th region having the joint line; and

the 5 th region not having the joint portion,

the 3 rd region, the 5 th region, and the 4 th region are alternately arranged in the width direction in this order from the width direction outer side toward the width direction inner side, and the 3 rd region to the 5 th region are all arranged at a position rearward of the 2 nd region, and the 3 rd region to the 5 th region are positioned inward in the width direction from the outer edge of the absorbent core.