KR20180098319A - Disposable diapers - Google Patents

Abstract

The disposable diaper 10 includes a front waist region 20, a rear waist region 30, a crotch region 25, a pair of fastening tapes 90, an absorbent core 40a, A waist-surrounding stretchable and contractible portion 85 disposed at the rear edge of the diaper and extending and contracting in the widthwise direction, a seat member disposed overlappingly with the waist-surrounding stretchable portion, and a joint portion 87 joining the waist- And a joining portion row 87L arranged at intervals in the longitudinal direction. A plurality of joint rows are arranged at intervals in the width direction. The disposable diaper includes a first region (R1) extending from both outer edges of the waist elastic member and extending inward in the width direction, and having no joint row, and a second region (R1) extending rearward from the front edge of the waist elastic member And a third region (R3) located on the inner side in the width direction than the first region and located behind the second region and having a row of junctions. The first region is located on the outer side in the width direction with respect to the absorbent core.

Description

Disposable diapers

The present invention relates to a disposable diaper.

Disclosed is a disposable diaper having an embossed heat between fastening tapes of a rear waist region. The embossing rows are arranged along the longitudinal direction and are arranged in plural in the width direction.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-90902

In the disposable diaper disclosed in Patent Document 1, the rigidity of the region where the embossed heat is provided is higher than the rigidity of the region where the embossed heat is not provided. Therefore, in the disposable diaper disclosed in Patent Document 1, wrinkles are formed by the embossed heat. The gap between the fastening tapes formed by the wrinkles is formed by the unevenness between the trailing edge of the disposable diaper and the body. A gap is formed between the rear end edge of the disposable diaper and the body, and there is a possibility that the excretion leaks from the back of the wearer.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-described problems, and it is an object of the present invention to increase the fit of the rear edge of the disposable diaper and to prevent leakage from the back of the wearer.

The disposable diaper (disposable diaper 10) according to the present disclosure has a front waist region (front waist region 20), a rear waist region (rear waist region 30) A crotch region (crotch region 25) positioned between the front waist region and the rear waist region and a crotch region (crotch region 25) positioned between the rear waist region and the rear waist region, A pair of fastening tapes (fastening tape 90) extending along the width direction in the rear waist region and fixed to the front waist region, (Absorbent core (40a)) extending toward the at least one of the front waist region and the rear waist region over the crotch region, and an absorbent core (40b) disposed at the rear end edge of the disposable diaper Waist circumference (Joint portion (87)) for joining the waist elastic stretchable portion and the sheet member to each other is disposed in the longitudinal direction of the waist elastic stretchable portion (The joining portion row 87L) arranged in the widthwise direction of the waist-opening stretchable portion, wherein the joining portion rows are disposed in plural in the width direction with a space therebetween, And a second region extending from the front edge of the waist elastic expanding portion toward the rear and having no joining portion row (second region (second region (R1) And a third region (third region (R3)) located on the inner side in the width direction than the first region and located behind the second region and having the junction row, wherein the first region Region, And that located on the outer side in the width direction as a base.

According to the present disclosure, the fit of the rear edge of the disposable diaper is improved, and leakage from the back of the wearer can be suppressed.

1 is an exploded plan view of a disposable diaper according to the present embodiment.
Fig. 2 is a 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 along the line F2-F2 shown in Fig.
4 is an exploded plan view showing an enlarged rear edge of the disposable diaper shown in Fig.
5 is an exploded plan view showing an enlarged rear edge of a disposable diaper according to 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 the proportions of the respective dimensions and the like are different from the reality.

Therefore, specific dimensions and the like should be judged based on the following description. Also, the drawings may include mutually different portions or proportions of the dimensions.

(1) Overall outline configuration of disposable diaper

1 is an exploded plan view of the disposable diaper 10 according to the present embodiment. Fig. 2 is a sectional view of the disposable diaper taken along line F1-F1 shown in Fig. 1. Fig. 3 is a sectional view of the disposable diaper taken along the line F2-F2 shown in Fig. Fig. 4 is an enlarged plan view of the rear end edge of the disposable diaper shown in Fig. 1; Fig. The developed view shown in Figs. 1 and 4 shows the leg stretchable and contractible portion 75 and the leg side stretchable and contractible portion 80 until the wrinkles of the top sheet 50, the side flaps 70 and the like constituting the disposable diaper are not formed, In which the elastic member of FIG.

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

A pair of leg openings 35 are formed in the disposable diaper 10. The leg openings 35 are provided at side end portions in the width direction of the disposable diaper and are disposed along the wearer's legs in a state in which the disposable diaper is worn by the wearer.

In the present embodiment, the direction from the front waist region 20 toward the rear waist region 30 is referred to as the longitudinal direction L, and the direction orthogonal to the longitudinal direction L is referred to as the lateral direction W I call it.

The disposable diaper 10 has an absorbent body 40. The absorbent body 40 has an absorbent 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 waist region 20 and the rear waist region 30. [

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

4, a low-unit weight region 110 having a lower unit weight of the absorbent material than other portions of the absorbent core 40a is formed in the absorbent core 40a. The low unit weight region 110 is located at the center in the width direction of the rear edge of the absorbent core 40a. The width of the low unit weight region 110 in the width direction W is widened toward the rear end edge of the absorbent core 40a. More specifically, the low-unit weight area 110 is wedge-shaped when the disposable diaper 10 is flat. The lower unit weight region 110 is more likely to be contracted than the peripheral portion when the waist expanding and contracting portion 85 described later contracts in the width direction so that the rear end of the absorbent core 40a becomes a cup shape along the buttocks of the wearer.

A liquid permeable top sheet 50 is provided on the surface side (skin facing surface side) of the absorber 40. In addition, a back sheet 60a of liquid-permeable permeability is provided on the back side (the skin non-facing side) of the absorber 40. [ An outer sheet 60 is provided on the back side of the back sheet 60a. The front end edge of the back sheet is positioned behind the front edge of the disposable diaper and the rear edge of the back sheet is positioned forward of the rear edge of the disposable diaper.

Side flaps 70 are provided on the outer edge (outer edge in the width direction) of the absorber 40, respectively. The side flaps 70 are arranged on the outer side in the width direction with respect to the absorbent body 40 across the front waist region 20, the crotch region 25 and the rear waist region 30. The side flaps 70 are composed of one nonwoven fabric or a plurality of two or more nonwoven fabrics. The side flaps 70 are located on the skin-facing side of the absorbent core 40a and extend outward in the width direction from the absorbent core 40a.

The side flaps 70 are provided with a pair of leg stretchable and contractible portions 75 that are disposed inside the leg openings 35 in the width direction and extendable and retractable in the longitudinal direction L. [ The leg stretchable and contractible portions 75 are arranged on the inner side in the width direction than the left and right leg openings. The leg stretchable and contractible portion 75 is composed of a stretchable sheet, a thread rubber, or the like. The leg stretchable and contractible portion 75 of the present embodiment is constituted by three left and right threaded rubbers, but may be constituted by a stretchable sheet made of a nonwoven fabric. The leg stretchable and contractible portion 75 may be configured so that the leg opening portion 35 can be stretched and contracted in the longitudinal direction.

The position of the leg stretchable and contractible portion 75 in the width direction may be changed. Specifically, the interval between the inner ends of the pair of left and right leg stretchable and contractible portions in the product width direction W is widened toward the front waist region 20 from the crotch region 25, To the rear waist region 30, as shown in Fig. By arranging the leg stretchable and contractible portion in a shape that is narrow in the crotch portion and widened in the waist-circumferential direction of the front and back, the leg stretchable and contractible portion can follow the line of the body, and the leg stretchable portion is stretched and arranged appropriately around the wearer's leg.

A pair of leg-stretchable and contractible portions 80 are provided on the inner side in the width direction of the pair of leg-stretchable and contractible portions 75, each extending along the longitudinal direction L. The leg side stretchable and contractible portion 80 has an elastic member 81 disposed at the inner side end in the width direction of the side flap 70 and extending and contracting in the longitudinal direction.

The disposable diaper 10 further includes a crotch stretchable and contractible portion 200 disposed in a region overlapping the absorbent body of the crotch region 25. [ The crotch stretchable and contractible portion 200 is constructed so as to be able to maintain a flat shape in a part of the crotch region 25 at the time of wearing the disposable diaper than other portions of the absorbent body 40. [ The crotch stretchable and contractible portion 200 is configured to be stretchable in at least a longitudinal direction L or a width direction W. [

In the absorbent core 40a of the crotch region 25, the first notch 115 and the second notch 125 are formed. The first cutout 115 and the second cutout 125 are slits formed in the absorbent core 40a. The slit is the portion where no absorbent 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 inside in the width direction.

The fastening tapes 90 are a pair and extend along the width direction W in the rear waist region 30 and are fixed to the skin non-facing surfaces of the front waist region 20, whereby the disposable diapers 10 ) To the wearer's body. The fastening tape 90 is attached to the area of the side flap 70 corresponding to the rear waist region 30. [ The fastening tape 90 has a base sheet 91 connected to the side flap 70 and a hook sheet 92 provided with a plurality of coupling hooks (not shown) and fixed to the base sheet 91 do. The hook sheet 92 is a region provided with a coupling hook.

The target portion 95 is provided on the surface of the outer sheet 60 of the front waist region 20 facing the skin. The target portion 95 is configured to catch the coupling hook of the fastening tape 90 and functions as a loop of the coupling system of the hook and the loop. As the target portion 95, for example, an air through nonwoven fabric may be used. The disposable diaper may be configured so as not to have a target portion but to fix the fastening tape 90 to the outer sheet 60 of the front waist region 20.

The disposable diaper 10 has a waist elastic stretchable portion that is stretchable in the width direction. The waist elastic portion 85 is disposed in the rear waist region. The waist elastic members 85 are disposed between a pair of fastening tapes 90 in the width direction and are contracted in the width direction between the fastening tapes 90. The front end edge of the waist elastic expanding / contracting portion 85 has a curved shape in which the center in the width direction is recessed toward the rear.

In the present embodiment, the waist-surrounding stretchable and contractible portion is constituted by a stretchable sheet, and for example, a stretchable film, stretchable nonwoven fabric and urethane can be used. The waist-opening stretchable and contractible portion 85 may be constituted by a stretchable nonwoven fabric. The waist elastic stretchable portion 85 made of a stretchable nonwoven fabric is easier to maintain the breathability around the waist of the infant and the baby as compared with the waist elastic stretchable portion made of the stretchable film. The waist-surrounding stretchable and contractible portion is a portion that substantially extends and contracts in the width direction, and is a concept excluding a portion where the stretchable sheet is disposed in a state in which the stretchable and contractible force is not exerted. Therefore, the outer edge of the waist elastic member described later is not the outer edge of the stretchable sheet, but the outer edge of the stretchable and contractible portion. In the present embodiment, a stretchable film having a unit weight of 20 to 45 g / m < 2 > is used as the waist elastic stretching portion. However, the waist elastic member 85 may be constituted by a different structure such as a plurality of thread rubbers. The waist stretchable and contractible portion is stretched at a predetermined ratio with respect to the length in the non-stretched state (natural state), and then adhered to the back sheet 60a by hot melt adhesive, heat treatment or the like. The waist elastic stretching portion will be described later in detail.

Further, the disposable diaper is provided with a plurality of joint portions for joining the waist elastic portion and the sheet member. The joining portion 87 joins the waist-surrounding stretchable and contractible portion 85 and the waist-surrounding stretchable and contractible portion 85 with sheet materials overlapping each other. The joining portion will be described later in detail.

The outer edge of the rear waist region of the outer sheet is located on the outer side in the width direction than the outer edge of the front waist region of the outer sheet. The outer edge of the outer sheet is the outer edge of the area of the disposable diaper excluding the fastening tape. The length in the width direction of the rear waist region of the outer sheet is longer than the length in the width direction of the front waist region of the outer sheet. Therefore, when fixing the fastening tape to the front waist region, it is easy to pull the outer edge of the rear waist region toward the front of the wearer's body. By pulling the outer edge of the rear waist region toward the front of the wearer's body, the waist elastic stretchable portion can be stretched to fit the rear edge of the disposable diaper to the wearer's body.

The length of the outer sheet in the width direction is elongated from the crotch region toward the trailing edge of the disposable diaper. More specifically, the length in the width direction of the outer sheet in the region where the pair of fastening tapes are arranged is longer than the width in the width direction of the outer sheet in the region in front of the low unit weight region of the absorbent core. The region where the fastening tape is disposed is relatively long in the width direction so that the fastening tape is liable to be located outside the absorbent core in the width direction even if it is contracted by the waist elastic stretching portion. The absorbent core is a region in which the wearer is put on the wearer. The fastening tape is disposed outside the absorbent core in the width direction, thereby preventing the fastening tape from being disposed between the wearer's body and the absorbent core, and skin irritation by the fastening tape can be suppressed.

(2) Constitution of waist circumferential stretching part and joining part

The waist elastic member 85 is composed of a stretchable sheet extending in the width direction from the center in the width direction of the disposable diaper toward both outer sides and extending in the width direction. The waist elastic expanding and contracting portion according to the present embodiment is configured to expand and contract in the width direction, but the waist expanding and contracting portion may be configured to expand and contract in the width direction and the longitudinal direction.

The rear edge of the waist elastic portion 85 coincides with the rear edge of the disposable diaper. The front end edge of the waist elastic expanding portion 85 is located forward of the rear end edge of the absorbent core 40a and is located forward of the rear end edge of the core wrap 40b. At least a part of the waist elasticizing part 85 overlaps the absorbent core 40a in a plan view of the disposable diaper. The waist stretchable and contractible portion 85 is formed so as to extend from the trailing edge of the absorbent core 40a and the trailing edge of the core wrap 40b to the trailing edge of the absorbent core 40a and to the front edge of the core wrap 40b . The outer edge of the waist-opening stretchable and contractible portion 85 is located inward in the width direction than the inner edge (inner edge in the width direction) of the fastening tape. The waist elastic stretching part 85 and the fastening tape 90 are spaced from each other in the width direction. Since the waist-surrounding stretchable and contractible portion 85 and the fastening tape 90 are spaced from each other in the width direction, the wearer can easily grasp the stretch allowable portion in which the waist-surrounding stretchable portion can expand and contract, and the fastening tape can be easily manipulated.

The waist-surrounding stretchable and contractible portion is located closer to the skin-facing surface than the absorbent core 40a. In the present embodiment, the waist elastic stretching portion is disposed between the outer sheet 60 and the back sheet 60a. The position of the waist elastic portion is not particularly limited. Further, in the region where the absorber is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the outer sheet 60. In the present embodiment, the skin surface sheet positioned on the skin-facing side of the waist elastic expanding and contracting portion includes a top sheet 50, a side flap 70 and a back sheet 60a. The non-skin surface sheet located on the skin non-facing surface side of the waist elastic portion includes the outer sheet (60).

In the region where the waist elastic stretching portion is disposed, a joining portion is formed. The abutment portion is formed in the region where the waist elastic member 85 is disposed. The joining portion 87 joins the waist-surrounding stretchable portion 85 and the waist-surrounding stretchable portion 85 with the sheet material overlapping by the heat seal. The joining portion may be a portion bonded by heat sealing, as well as another joining method such as ultrasonic welding or an adhesive.

The sheet material is specifically a top sheet 50, a side flap 70, a back sheet 60a, and an outer sheet 60. In the region where the top sheet 50 and the waist elastic stretching portion overlap each other, the joining portion joins the top sheet 50, the waist elastic stretchable portion, the back sheet 60a, and the outer sheet 60 together. In the region where the side flap 70 and the waist elastic stretching portion overlap each other, the joining portion joins the side flap 70, the waist elastic stretchable portion, the back sheet 60a, and the outer sheet 60 together.

The abutting portion 87 is pointed in the plan view of the disposable diaper. The joint portion formed by the heat seal becomes a film, and the air permeability of the portion is lowered. By arranging the joints in a point shape, the air permeability can be ensured in the region around the joint portion, and the decrease in the air permeability around the waist can be suppressed. The joining portions 87 are arranged along the longitudinal direction L. As shown in Fig. The joining portion has a center joining portion 871 disposed in a fourth region R4 described later and a side joining portion 872 disposed in a third region R3 described later. The center joining portion 871 is shifted in the longitudinal direction with respect to the center joining portion 871 adjacent in the width direction. That is, the center joint portions 871 are arranged in a staggered manner. The portion provided with the joined portion has a higher rigidity than the portion not provided with the joined portion and the stretchability of the waist elastic stretchable portion is lowered. By arranging the center joint portions 871 in a staggered arrangement, the rigidity along the longitudinal direction can be improved while suppressing the decrease in the stress in the width direction, as compared with the structure in which the center joint portions 871 are continuously arranged.

The side joint portions 872 are aligned in the longitudinal direction with the side joint portions 872 that are adjacent in the width direction. The center joining portion 871 and the side joining portion 872 are spaced apart in the longitudinal direction L and the width direction W. [ The longitudinal distance D1 between the center joints 871 is greater than the longitudinal distance D2 between the side joints 872. [ The widthwise spacing D3 of the center joining portions 871 is greater than the spacing D4 of the side joining portions 872 in the width direction. The longitudinal distance D1 of the center joining portion 871 coincides with the widthwise distance D3 of the center joining portion. In addition, the longitudinal distance D2 of the side joints coincides with the lateral distance D4 of the side joints.

The joining portion row 87L is a row of a plurality of joining portions arranged at intervals in the longitudinal direction L. A plurality of joining portion rows 87L are provided at intervals in the width direction. The front edge of the joining portion row 87L coincides with the rear edge of the second region R2. The rear end edge of the joining portion row 87L is disposed at the rear end edge of the disposable diaper. The joining portion row 87L has a center joining portion row 871L in which the center joining portions 871 are spaced apart and a side joining portion row 872L in which the side joining portions 872 are spaced apart. A plurality of the center joint row 871L are arranged at intervals in the width direction. The interval in the width direction of the center joint row 871L is larger than the interval in the widthwise 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 expanding and contracting portion 85 and a pair of first regions R1 extending rearward from the front edge of the waist elastic expanding and contracting portion 85 A plurality of third regions R3 positioned on the inner side in the width direction with respect to the first region R1 and located behind the second region R2 and a plurality of second regions R2 arranged on the third region R3 A fourth region R4 extending outward in the width direction from the center in the width direction of the disposable diaper on the inner side in the width direction and a fourth region R4 extending between the third region R3 and the fourth region R4, 5 region R5. In Fig. 4, different slant lines are shown for each of the first region R1, the second region R2, the third region R3, the fourth region R4 and the fifth region R5. The disposable diaper according to the present embodiment may have at least the first region R1, the second region R2 and the third region R3.

The first region R1 is disposed in the entire lengthwise direction of the outer edge of the waist elastic expandable portion 85 and extends inward in the width direction from the 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 (The outer edge of the third region R3 located outside the direction). The first region R1 is located on the outer side in the width direction than the outer edge of the absorbent core 40a. The rear edge of the first region R1 coincides with the rear edge of the waist elastic expanding and contracting portion 85. The front edge of the first region R1 coincides with the front edge of the waist elastic expanding / contracting portion 85. The first region R1 is located on the outer side in the width direction than the absorbent core 40a. In addition, the bonding region 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 stretchable portion 85 of 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 and contractible portion 75. [ The region extending in the longitudinal direction from the leg stretchable and contractible portion 75 is a region sandwiched between two extension lines extending in the longitudinal direction from the thread rubbers located on both outer sides in the width direction of the three thread rubbers.

The second region R2 is disposed between the pair of first regions R1. The second region R2 is disposed over 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 trailing edge of the second area R2 coincides with the front edge of the third area R3 and coincides with the front edge of the fourth area R4 and coincides with the front edge of the fifth area R5 . The front edge of the second region R2 coincides with the front edge of the waist elastic expanding and contracting portion 85. [ At least a part of the second region R2 overlaps with a region where the unit weight of the absorbent core 40a is relatively high (a region other than the low unit weight region) and a low unit weight region 110 of the absorbent core 40a . At least a part of the second region R2 including the trailing 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 second region R2 is not provided with the joining portion 87. [ Since the joining portion 87 is not provided in the second region R2, the stretchability of the waist elastic stretchable portion 85 of 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 extends across the outer edge of the absorbent core 40a in the width direction. The rear edge of the third region R3 coincides with the rear edge of the waist elastic expanding and contracting portion 85. [ The front edge of the third area R3 coincides with the rear edge of the second area 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 stretchable and contractible waist portion 85 is bonded to the sheet member through the side bonding portion 872, and the stretchability of the side bonding portion 872 is lowered. Therefore, the stretchability of the waist elastic stretchable portion 85 of the third region R3 is lower than the stretchability of the region where no joint is 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 edge of the fourth region R4 coincides with the rear edge of the waist elastic expanding and contracting 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. The fourth region R4 is provided with a center joint row 871L. The stretchability of the waist elastic expanding portion 85 of the fourth region R4 is lower than the elasticity of the region where the joined portion is not provided (the first region R1, the second region R2 and the fifth region R5).

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

The fifth region R5 is disposed between the pair of third regions R3. The rear edge of the fifth region R5 coincides with the rear edge of the waist elastic expanding and contracting 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 inward in the width direction from the outer edge of the absorbent core 40a. The joint region 87 is not provided in the fifth region R5. Since the fifth region R5 is not provided with the joining portion 87, the stretchability of the waist elastic stretchable portion 85 of the fifth region R5 is maintained.

Further, the waist elastic member 85 has a region having a high elongation and a region having a low elongation. Specifically, a high elongation area having a relatively high elongation is arranged at the center in the width direction of the waist elasticizer 85, a low elongation area having a relatively low elongation is arranged outside the high elongation area in the width direction, And a high elongation area is disposed on the outer side. The outer end edge of the high elongation area at the center in the width direction is the outer end edge of the fifth area. That is, the fourth region and the fifth region are high elongation regions. The outer end edge of the short length region is the outer end edge of the third region. That is, the third region is a short-length region. The first region is a high elongation region.

The expansion / contraction ratio of the waist elastic expanding / contracting portion 85 varies depending on the difference in elongation percentage of the waist elastic stretching portion and the presence or absence of the joining portion 87. Since the first region and the fifth region are high elongation regions and the joint portion is not provided, the stretchability of the waist-opening stretchable portion 85 is high. Although the fourth region is a high elongation region, the stretching ratio of the waist elastic stretching portion 85 is lower than that of the first region and the fifth region because the abutting portion is provided and the stretching ratio is lowered by the abutting portion. In addition, the third region is a short-length region, and since the joining portion is provided and the expansion ratio is lowered by the joining portion, the expansion ratio is lower than that of the fourth region.

Further, the second region is not provided with the joining portion, and therefore the expansion / contraction ratio changes only by the difference in the elongation percentage of the waist elastic stretching portion. Specifically, the center in the width direction (the range in the width direction of the fourth region) is a high elongation region, and the expansion / contraction ratio is high. On the other hand, the outside in the width direction (the range in the width direction of the third region and the fifth region) is a short-length region, and the expansion / contraction ratio is low.

(3) Manufacturing method of disposable diaper

Next, an example of a method of manufacturing the absorbent article according to the present embodiment will be described. As for the method not described in the present embodiment, an existing method can be used. In addition, the production method described below is an example, and the production method can also be produced by another manufacturing method. A method of manufacturing an absorbent article includes at least a component forming step, a component part placing step, a joining part forming step, a leg-hole forming step, and a cutting step.

In the constituent part forming step, constituent parts constituting the absorbent article are formed. Concretely, for example, the absorber 40 is formed by laminating the absorbing material, or the fastening tape 90 is formed.

In the constituent component placement process, on the web constituting the back sheet, a stretchable sheet constituting the waist elastic member 85, another web such as a web constituting the top sheet, a leak-barrier sheet, an absorbent body, a leg stretchable and contractible portion 75 are placed on the disposable diaper 10. In the component component placement process, the elastic sheet constituting the waist elastic member 85 is arranged. By disposing the component parts by the constituent component placement process, a continuum is formed in which the disposable diaper is continuous in the longitudinal direction.

As a method of changing the extension ratio of the waist elastic expanding portion 85, for example, the following methods can be mentioned. Before the waist elastic member 85 is joined to the back sheet 60a or the like, the waist elastic member 85 is extended in the width direction by a gear. (For example, the second region) in which the elongation is lowered when the gear is extended by the gear. (For example, the first region and the third region) in which the elongation percentage is increased. The strength of the gear extension can be adjusted by changing the depth of the convex portion of the gear, the pitch of the convex portion of the gear, and the number of times of gear extension. The elongation of the strongly stretched region is relatively high and the elongation of the slightly stretched region is relatively low.

In the joining portion forming step, a joining portion is formed by heat sealing.

The leg circumference forming process cuts the top sheet 50, the outer sheet 60, and the back sheet 60a. Thereby, the leg openings 35 disposed around the wearer's legs are formed. After the leg-hole forming step, the joining portion forming step may be performed.

In the cutting step, a continuous body in which the topsheet 50, the backsheet 60a, the absorbent body 40, and the like are disposed is cut into one product size along the width direction W. Thus, the front waist region stretchable portion is disposed in the front waist region 20 and the waist elastic stretchable portion is disposed in the rear waist region 30, thereby manufacturing the disposable diaper 10.

(4) Action and effect

The region having relatively high rigidity is formed along the longitudinal direction by the joining portion row of the third region R3 and the region where the joining portion row is disposed is contracted in the width direction by the waist elastic expanding and contracting portion 85, A plurality of elongated wrinkles are formed at intervals in the width direction. Since wrinkles extending in the longitudinal direction are formed, wrinkles extending in the width direction are hardly formed. When the wrinkles extending in the width direction are formed, a bending fulcrum extending in the width direction is formed, and the rear edge of the diaper rises to cause leakage of the excretion. However, it is difficult to form wrinkles extending in the width direction, so that the rear edge of the diaper can be prevented from rising.

Further, since the wrinkles extending in the longitudinal direction are formed, a plurality of bending fulcrums are formed at intervals in the width direction, and it is easy to arrange them along the roundness around the waist. Further, the concave and convex portions are formed by the wrinkles extending in the longitudinal direction, but the concave and convex portions can be fitted to the body by the waist expandable and contractible portion 85, so that a gap due to the unevenness is not formed, . Further, since the waist elastic stretchable 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 unintentionally bent.

The first region (R1) located on the outer side in the width direction of the absorbent core (40a) is disposed at a position abutting against the waist bones of the wearer's side. The first region R1 is not provided with a joining portion row, and the stretching force is higher than that of the third region R3 provided with the joining portion row because the stretching force of the waist stretchable portion is maintained. The fit of the waist around the wearer's waist is strengthened by the first region R1. The gap between the body and the disposable diaper is reduced, and the leakage of the excretion can be suppressed.

The second region R2 is not provided with the joining portion 87 and the stretching force of the waist stretchable and contractible portion 85 is maintained so that the second region R2 is higher in stretching force than the third region R3 provided with the joining portion row. The deformation of the absorbent core 40a is absorbed by the second region R2 and the deformation of the absorbent core 40a is absorbed by the third region R3 and the second region R2, Propagation to the rear edge can be suppressed. Therefore, the fitability of the trailing edge of the disposable diaper can be maintained.

The rear end edge of the joining portion row 87L may be disposed at the rear end edge of the disposable diaper. It is difficult for the wrinkle extending in the longitudinal direction to reach the trailing edge of the disposable diaper so that it is difficult to form the trailing edge of the disposable diaper or a bending origin extending in the width direction. Therefore, it is possible to prevent the trailing edge of the disposable diaper from rising due to the bending fulcrum extending in the width direction.

At least a part of the second region R2 may be arranged 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 on the rear side of the absorbent core 40a is not deformed together with the absorbent body, and the deformation of the absorbent body is hardly propagated directly. It is possible to effectively suppress the deformation of the absorbent core 40a from being absorbed by the second region R2 and propagating the deformation of the absorbent core 40a to the third region R3.

The sheet material joined to the waist elastic expanding and contracting portion by the abutment portion includes a skin surface sheet (the top sheet 50, the side flap 70 and the back sheet 60a) positioned on the skin facing side of the waist elastic stretching portion, Skin surface sheet (outer sheet 60) located on the side of the negative skin non-facing surface. The skin cotton sheet, the waist elastic stretchable portion and the non-skin cotton sheet are joined together through the joint portion. It is possible to prevent the skin surface sheet from rising from the rear edge of the diaper or from floating the non-skin surface sheet from the rear edge of the diaper, because wrinkles are formed on both the skin surface sheet and the non- Further, by having the skin surface sheet, it is possible to improve the tactile feeling of the surface of the infant and the skin in contact with the skin.

The first region R1 may be disposed in a region extending in the longitudinal direction from the leg stretchable and contractible portion. When the disposable diaper is manufactured, the elastic members constituting the leg stretchable and contractible portion are stretched in the longitudinal direction of the product in a continuous state, and the elastic members in the stretched state are joined to the web (back sheet, external sheet or the like) After the continuous continuum is produced, the continuum is cut along the product width direction for each individual product length. According to the above production method, by cutting the continuum, the elastic member in the elongated state contracts in the longitudinal direction of the product, leaving only the portion bonded in the vicinity of the leg-openings. In this manufacturing method, the leg stretching portion is arranged at the time of manufacturing in the region extending in the longitudinal direction from the leg stretching and shrinking portion, but the leg stretching portion is not disposed in the product state and the webs sandwiching the leg stretching portion are not joined .

Since the first region R1 (having no joining portion) having a relatively high elasticity is disposed in the region extending in the longitudinal direction from the leg stretchable and contractible portion, the region where the skin surface sheet and the non- It is possible to prevent leakage of the SAP from the absorbent core due to leaking in the region.

The fifth region R5 and the fourth region R4 may be located inside the width direction than the outer edge of the absorbent core 40a. A first region R1 having no joining portion row, a third region R3 having a joining portion row, and a fifth region R5 having no joining portion row from the outer edge of the waist- And a fourth region R4 having a row of junctions. Since the region having a high expansion / contraction ratio and the region having a low expansion / contraction ratio are alternately arranged, it is possible to increase the fitting performance while restraining the wearing of the wearer excessively.

More specifically, it is possible to improve the fitting property at the time of disposing the disposable diaper. When the disposable diaper is mounted, the body of the wearer is put on the rear waist region of the disposable diaper in a state in which the disposable diaper is deployed. At this time, the body of the wearer is wrapped so as to cover the full width of the absorbent core 40a. The wearer wants to fasten the fastening tape to the front waist region in a state where the wearer's body is loaded on the full width of the absorbent core 40a. At this time, the first region (R1) located outside the absorbent core (40a) in the width direction is stretched outward in the width direction and stretched. On the other hand, the fourth region R4 and the fifth region R5 located inside the width direction than the first region R1 are located on the inner side in the width direction than the outer edge of the absorbent core 40a, So that it is hardly elongated in the width direction. In the third region R3, the inner portion in the width direction than the outer edge of the absorbent core 40a is not elongated, and the outer portion in the width direction is elongated from the outer edge of the absorbent core 40a. Therefore, the waist elastic stretching portion in the state before wearing the disposable diaper and causing the wearer to stretch a part of the first region R1 and the third region R3, and the other portion of the third region R3, The fourth region R4 and the fifth region R5 were hardly elongated.

When the wearer is caused to wear after wearing the disposable diaper, the body pressure applied to the absorbent core 40a is reduced. Therefore, the other portion of the third region R3, the fourth region R4, and the fifth region R5 are easier to expand and contract as compared with the state before the wearer is caused. At this time, since the first region R1 of the waist elastic expanding portion is already elongated and the fourth region R4 is more likely to elongate than the fifth region R5, the fourth region R4 is the fifth region R5 ) And stretched. As a result, the fourth region R4 of the waist elastic expanding portion in the state of causing the wearer is fitted to the wearer's body with a weak force. Likewise, the third region R3 is also fitted to the wearer's body with a weak force. Since the region having a relatively high expansion / contraction ratio and the region having a relatively low expansion / contraction ratio are provided, it is possible to enhance the fitting performance while suppressing excessive fastening of the wearer.

The second region R2 may be disposed over the center in the width direction of the disposable diaper. The center of the back of the wearer is arranged with the backbone, and is recessed to the abdomen than the right and left parts. The recessed portion is a recessed portion of the neck portion, and the second recessed portion R2 is formed in the recessed portion. A portion contracted by the second region R2 is disposed at the wearer's recessed portion. Therefore, it is possible to suppress the occurrence of a gap between the center of the back of the wearer and the disposable diaper, and more reliably prevent leakage from the back side of the back portion.

The area density of the bonding portion of the third region R3 may be higher than the area density of the bonding portion of the fourth region R4. Since the area of the bonding area per unit area in the third area R3 is higher than the area of the bonding area per unit area in the fourth area R4, the bonding area of the third area R3 is dense compared to the fourth area R4 Respectively. However, since the elongation percentage of the waist circumferential stretchable portion of the fourth region R4 is higher than the elongation percentage of the waist circumferential stretchable portion of the third region R4, the elongation percentage of the waist- The stretching ratio of the stretching portion is higher than that of the stretching portion. The portion contracted by the fourth region is disposed in the wearer's neck portion. Therefore, it is possible to suppress the occurrence of a gap between the center of the back of the wearer and the disposable diaper, and more reliably prevent leakage from the back side of the back portion.

(5) Modifications

Next, a disposable diaper according to a modified example will be described with reference to Fig. 5 is an enlarged plan view of a rear end edge of the disposable diaper 10A according to a modification. In the disposable diaper according to the modified example, the same reference numerals as those of the disposable diaper according to the embodiment are used to denote the same reference numerals, and a description thereof will be omitted. The disposable diaper 10A according to the modified example has a plurality of third regions R3 and a plurality of fifth regions R5. Therefore, in the rear end edge of the disposable diaper, the fourth region R4 having a comparatively low expansion / contraction ratio of the waist elastic expanding / contracting portion 85 toward the outside from the widthwise center of the disposable diaper, A third region R3 having a relatively low expansion / contraction ratio, a third region R3 having a relatively low expansion / contraction ratio, a fifth region R5 having a relatively high expansion / contraction ratio, a third region R3 having a relatively low expansion / Respectively.

Also in the disposable diaper according to the modified example, wrinkles extending in the longitudinal direction are formed at the rear end edge of the disposable diaper so that the rear end edge of the disposable diaper is prevented from rising, and the durability of the back can be maintained. Further, since the waist-surrounding stretchable and contractible portion can fit the unevenness to the wearer's body, a gap due to the unevenness can not be formed, and leakage from the back of the wearer can be suppressed. In the disposable diaper according to the modified example, the fifth region R5 is disposed on an extension of the elastic member 81 of the leg side stretchable and contractible portion 80 in the longitudinal direction. The elastic member 81 is not fixed by the joining portion at the time of manufacture and the elastic member 81 is contracted in the longitudinal direction because the joining portion is not disposed on the extension extending in the longitudinal direction from the elastic member 81 Can be deployed.

As described above, the contents of the present invention have been disclosed through the embodiments of the present invention, but it should not be understood that the description and the drawings constituting a part of this disclosure are intended to limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. Accordingly, the technical scope of the present invention is determined only by the inventive particulars of the relevant patent claims from the above description.

Further, the entire contents of Japanese Patent Application No. 2015-250041 filed on December 22, 2015 are incorporated herein by reference.

It is possible to provide a disposable diaper capable of increasing the fitting property of the trailing edge of the disposable diaper and suppressing leaking from the back of the wearer.

10: Disposable diapers
20: front waist region
25: Crotch area
30: rear waist region
40: absorber
40a: absorbent core
40b: core wrap
50: Top sheet (sheet material)
60: outer sheet (sheet material)
60a: back sheet (sheet material)
70: Side flap (sheet material)
85: waist elastic stretching part
87:
87L: Junction column
871: Central joint
871L: central joining column
872: side joint
872L: side joining column
90: Fastening tape
L: longitudinal direction
W: width direction
R1: first region
R2: second region
R3: third region

Claims (7)

A front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region,
A longitudinal direction extending from the front waist region to the rear waist region, a width direction orthogonal to the longitudinal direction,
A pair of fastening tapes extending along the width direction in the rear waist region and fixed to the front waist region,
An absorbent core extending across the crotch region toward one or both of the front waist region and the rear waist region,
A waist elastic stretching portion disposed at a rear end edge of the disposable diaper and extending and contracted in the width direction,
A sheet member arranged to overlap with the waist elastic member,
And a joining portion joining the waist-opening stretchable portion and the sheet member to each other is disposed at an interval in the longitudinal direction,
The disposable diaper according to any one of claims 1 to 3,
A first region extending inwardly in the width direction from both outer edges of the waist elastic expanding and contracting portion,
A second region extending rearward from a front edge of the waist elastic expanding and contracting portion and having no joint portion;
And a third region located on the inner side in the width direction than the first region and located behind the second region and having the junction row,
Wherein the first region is located on the outer side in the width direction with respect to the absorbent core. The disposable diaper according to claim 1, wherein a trailing edge of the row of abutments is disposed at a trailing edge of the disposable diaper. The disposable diaper according to any one of claims 1 to 5, wherein part or all of the second region is disposed behind the absorbent core. The disposable diaper according to claim 1 or 2, wherein the sheet material is a disposable diaper comprising a skin surface sheet positioned on the skin-facing side of the waist elastic stretching portion and a non-skin surface sheet positioned on the skin non- diaper. [5] The apparatus according to claim 4, further comprising a leg stretchable portion disposed around the wearer's leg and extending and contracting in the longitudinal direction,
And a part or all of the first region is disposed in a region extending in the longitudinal direction from the leg stretching and shrinking portion. The disposable diaper according to claim 1 or 2, further comprising: a fourth region extending outward in the width direction from the center in the width direction of the disposable diaper in the width direction than the third region,
A fifth region located between the third region and the fourth region and having no junction,
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. 3. The disposable diaper according to claim 1 or 2, wherein the second region is disposed over a center in the width direction of the disposable diaper.

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