TW201733543A - Disposable diaper - Google Patents

Abstract

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

Description

Disposable disposable diaper

This invention relates to disposable diapers.

A disposable diaper is disclosed which has an embossed row between the fastening strips in the back waist region. The embossed array is arranged in plural along the longitudinal direction at intervals in the width direction.

Advanced technical literature Patent literature

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

In the disposable disposable diaper of Patent Document 1, the rigidity of the region in which the embossed row is provided is higher than the rigidity in the region in which the embossed row is not provided. Therefore, the disposable disposable diaper of Patent Document 1 is wrinkled by the embossed column. Since the adhesive tape forms irregularities due to wrinkles, a gap is formed between the trailing edge of the disposable diaper and the body due to the unevenness. Due to use A gap is formed between the rear end edge of the disposable diaper and the body, and there is a flaw that causes excretion to leak out on the back side of the wearer.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to improve the adhesion of the trailing edge of a disposable disposable diaper and to suppress leakage of the back side of the wearer.

The disposable disposable diaper (the disposable disposable diaper 10) of the present invention mainly has a front waistline region (front waistline region 20), a rear waistline region (rear waist region 30), and a lower armpit region (underarm a 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 (bonding tapes 90) extending in the width direction of the rear waist region and fixed to the front waistline region; an absorbent core (absorbent core 40a) spanning the underarm region toward the front waistline At least one of the region and the rear waistline region extends; the waist stretchable portion (waist stretchable portion 85) is disposed at the rear end edge of the disposable disposable diaper, and expands and contracts in the width direction; the sheet material is superposed on the waist circumference a joint portion (joining portion row 87L), and a joint portion (joining portion 87) that joins the waist stretchable portion and the sheet material are arranged at intervals in the longitudinal direction; and the joint portion row is along the width The disposable disposable diaper 10 has a first region (R1) extending from the outer side edges of the waist elastic-contracting portion toward the inner side in the width direction, and does not have the joint portion row; The second region (R2) extends rearward from the front end edge of the waist elasticized portion, and does not have the joint portion row; The third region (R3) is located on the inner side in the width direction of the first region and behind the second region, and has the joint portion row; the first region is located outside the absorbent core in the width direction.

According to the present invention, the adhesion of the rear end edge of the disposable disposable diaper can be improved, and leakage of the back side of the wearer can be suppressed.

10‧‧‧Disposable disposable diapers

20‧‧‧ Front waist area

25‧‧‧胯下区域区

30‧‧‧After waist area

40‧‧‧ absorber

40a‧‧‧Absorbent core

40b‧‧‧ core cladding

50‧‧‧Top sheet (sheet)

60‧‧‧Outer sheets (sheets)

60a‧‧‧Back sheet (sheet)

70‧‧‧Flanking (sheet material)

85‧‧‧Waist expansion and contraction

87‧‧‧ joints

87L‧‧‧ joint section

871‧‧‧Central Joint

871L‧‧‧Center joint column

872‧‧‧ Side joints

872L‧‧‧ side joint column

90‧‧‧Buckle belt

L‧‧‧ Length direction

W‧‧‧Width direction

R1‧‧‧1st area

R2‧‧‧2nd area

R3‧‧‧3rd area

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

Figure 2 is a cross-sectional view of the disposable disposable diaper taken along line F1-F1 of Figure 1.

Figure 3 is a cross-sectional view of the disposable disposable diaper taken along line F2-F2 of Figure 1.

Figure 4 is an enlarged plan view showing the rear end edge of the disposable disposable diaper shown in Figure 1.

Fig. 5 is an enlarged plan view showing an enlarged rear end edge of the disposable diaper after the modification.

Next, an embodiment of the disposable disposable diaper 10 of the present invention will be described with reference to the drawings. In the following description, the same or similar components are given the same or similar symbols. However, the drawing is a schematic diagram, and it should be noted that the ratio of each dimension is different from the actual one.

Therefore, the specific dimensions and the like should be judged based on the following description. Moreover, the drawings may also include portions having different dimensional relationships or ratios from each other.

(1) Overall outline of the disposable disposable diaper

Fig. 1 is a developed plan view of the disposable disposable diaper 10 of the present embodiment. Figure 2 is a cross-sectional view of the disposable disposable diaper taken along line F1-F1 of Figure 1. Figure 3 is a cross-sectional view of the disposable disposable diaper taken along line F2-F2 of Figure 1. Figure 4 is an enlarged plan view showing the rear end edge of the disposable disposable diaper shown in Figure 1. The development diagrams shown in Fig. 1 and Fig. 4 are used to elasticize the leg stretch portion 75 and the leg side stretch portion 80 until the top sheet 50, the side flaps 70, and the like which constitute the disposable paper diaper are not wrinkled. A diagram of the state of the member's elongation.

The disposable 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 is in contact with the front waistline (abdominal portion) of the wearer. Further, the rear waistline region 30 is a portion that is in contact with the wearer's rear waistline portion (back portion). The crotch region 25 is located between the front waistline region 20 and the rear waistline region 30.

The disposable disposable diaper 10 forms a pair of leg openings 35. The leg opening portion 35 is provided at the side end portion in the width direction of the disposable disposable diaper, and the disposable diaper is worn in the state of the wearer after use, and is disposed along the leg circumference of the wearer. .

Further, in the present embodiment, the direction from the front waistline region 20 toward the rear waistline region 30 is referred to as the longitudinal direction L, and the longitudinal direction is positive. The direction of intersection is called the width direction W.

The disposable disposable diaper 10 has an absorbent body 40. The absorber 40 has an absorbent core 40a and a core cladding 40b. The absorbent core 40a extends across the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30.

The absorbent core 40a can be suitably formed using a well-known member or material such as pulverized pulp or a superabsorbent polymer, similarly to the conventional disposable diaper. The absorbent core 40a is covered by a sheet-like core cladding 40b. The core cladding 40b is a sheet covering the absorbent core 40a. The rear end edge of the absorbent core 40a and the rear end edge of the core clad 40b substantially coincide, and the front end edge of the absorbent core 40a and the front end edge of the core clad 40b substantially coincide. More specifically, the distance between the rear end edge of the absorbent core 40a and the rear end edge of the core clad layer 40b is 5 mm or less, and the distance between the front end edge of the absorbent core 40a and the front end edge of the core clad layer 40b is 5 mm or less.

As shown in FIG. 4, the absorbent core 40a is formed with a low basis weight region 110 having a lower basis weight of the absorbent material than other portions of the absorbent core 40a. The low basis weight region 110 is located at the center in the width direction of the rear end edge of the absorbent core 40a. The width of the low basis weight region 110 in the width direction W is widened toward the rear end edge of the absorbent core 40a. More specifically, when the disposable diaper 10 is used in a plan view, the low basis weight region 110 has a wedge shape. When contracting in the width direction by the waist elastic portion 85 to be described later, the low basis weight region 110 is more easily contracted than the circumference, and the rear end portion of the absorbent core 40a is formed in a cup shape along the buttocks of the wearer.

It is provided on the surface side (the opposite side of the skin) of the absorber 40 Liquid permeable top sheet 50. Further, a back sheet 60a which is liquid-impermeable is provided on the back side (non-skin facing side) of the absorber 40. An exterior sheet 60 is provided on the back side of the back sheet 60a. The front end edge of the back sheet is located further rearward than the front end edge of the disposable disposable diaper, and the rear end edge of the back sheet is located further forward than the trailing edge of the disposable disposable diaper.

The side edges 70 are provided in the outer edge (outer end in the width direction) of the absorber 40, respectively. The side flaps 70 straddle the front waistline region 20, the crotch region 25, and the rear waistline region 30, and are disposed outside the absorbent body 40 in the width direction. The side flaps 70 are constituted by one or two or more sheets of non-woven fabrics that are overlapped. The side flap 70 is located on the skin facing surface side of the absorbent core 40a, and extends outward in the width direction from the absorbent core 40a.

The side flap 70 is provided with a pair of leg stretchable portions 75 that are disposed on the inner side in the width direction of the leg opening portion 35 and that can expand and contract in the longitudinal direction L. The leg stretchable portions 75 are disposed on the inner side in the width direction of the left and right leg openings, respectively. The leg stretchable portion 75 is composed of a stretchable sheet, a rubber thread, or the like. The leg stretchable portion 75 of the present embodiment is composed of three rubber threads on the left and right sides, and may be formed of a stretchable sheet made of a nonwoven fabric. The leg stretch portion 75 is configured to extend the leg opening portion 35 so as to be expandable and contractable in the longitudinal direction.

The position of the leg stretch portion 75 in the width direction may also be changed. Specifically, the interval between the inner ends of the pair of left and right leg stretchable portions in the product width direction W is preferably as widened from the underarm region 25 toward the front waistline region 20, and with the waistline from the underarm region 25 toward the back waistline The area 30 is widened. To arrange the leg expansion and contraction portion to be narrowed in the lower part of the crotch and widened toward the front and rear waist circumferences The shape further enables the leg stretch portion to follow the line of the body, and the leg stretch portion is appropriately extended to be disposed around the wearer's leg.

A pair of leg side expansion and contraction portions 80 extending in the longitudinal direction L are provided on the inner side in the width direction of the pair of leg stretchable portions 75. The leg side expansion-contraction part 80 is arrange|positioned at the inner side edge part of the width direction of the side flap 70, and has the elastic member 81 which expands and expands in the longitudinal direction, and the upright expansion|contraction wrinkles.

Further, the disposable disposable diaper 10 includes a crotch elasticized portion 200 disposed in a region overlapping the absorbent body of the crotch region 25. The crotch stretchable portion 200 is configured to maintain a flat shape in a portion of the crotch region 25 when worn, as compared with other portions of the absorbent body 40. The crotch stretch unit 200 is configured to be expandable and contractable at least in the longitudinal direction L or the width direction W.

The first notch 115 and the second notch 125 are formed in the absorbent core 40a of the crotch region 25. The first notch 115 and the second notch 125 are formed in the gap of the absorbent core 40a. The gap is the portion where the absorbing material does not exist. The first notch 115 and the second notch 125 are each formed in a notch shape extending from the outer edge of the absorbent core 40a toward the inner side in the width direction.

The fastening tape 90 is a pair and extends in the width direction W in the rear waistline region 30 and is fixed to the non-skin opposing surface of the front waistline region 20, thereby holding the disposable disposable diaper 10 to the wearer's body. The fastening strip 90 is mounted in the region of the side flaps 70 corresponding to the rear waistline region 30. The fastening tape 90 includes a base sheet 91 that is coupled to the side flaps 70, and a hook sheet 92 that is fixed to the base sheet 91 by a plurality of engagement hooks (not shown). The hook sheet 92 is provided with a region in which the hook is engaged.

The target portion 95 is provided on the non-skin opposing side surface of the exterior sheet 60 of the front waistline region 20. The target portion 95 is configured to engage the engagement hook of the fastening tape 90 as a function of the loop of the hook and loop locking system. The target portion 95 can use, for example, a hot air non-woven fabric. Further, the disposable disposable diaper may be configured to fix the fastening tape 90 to the exterior sheet 60 of the front waistline region 20 without having a target portion.

The disposable disposable diaper 10 has a waist elasticized portion that can expand and contract in the width direction. The waist elasticized portion 85 is disposed in the rear waist region. The waist elastic-contraction portion 85 is disposed between the pair of fastening tapes 90 in the width direction, and is contracted in the width direction between the fastening tapes 90. The front end edge of the waist elasticized 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 elasticized portion is formed of a stretchable sheet, and for example, a stretch film, a stretchable nonwoven fabric, and a urethane can be used. The waist elasticized portion 85 can also be constituted by a stretchable nonwoven fabric. The waist elastic portion 85 composed of the stretchable nonwoven fabric is more likely to maintain the air permeability around the waist of the infant than the waist stretchable portion formed of the stretch film. Further, the waist elastic-contracting portion is a portion that substantially expands and contracts in the width direction, and removes the concept of the portion in which the stretchable sheet is disposed without exhibiting the expansion and contraction force. Therefore, the outer edge of the waist stretchable portion to be described later is not the outer edge of the stretch sheet, but the outer edge of the portion that expands and contracts. In the present embodiment, a stretchable film having a basis weight of 20 to 45 g/m ² is used for the waist stretchable portion. However, the waist elastic-contraction portion 85 may be configured by other structures such as a plurality of rubber threads. The waist stretchable portion is attached to the back sheet 60a by a hot melt adhesive or heat treatment after being stretched to a predetermined magnification with respect to the length of the non-stretched state (natural state). The waist expansion and contraction portion will be described in detail later.

Further, in the disposable disposable diaper, a plurality of joint portions for joining the waist elasticized portion and the sheet member are provided. The joint portion 87 joins the waist stretchable portion 85 and the sheet material that overlaps the waist stretchable portion 85. The joint portion will be described in detail later.

The outer edge of the rear waistline region of the outer sheet is located outside the outer edge of the front waistline region of the outer sheet in the width direction. The outer edge of the outer sheet is the outer edge of the area after the disposable diaper is removed to remove the adhesive strip. The length of the rear waistline region of the outer sheet in the width direction is longer than the length of the front waistline region of the outer sheet in the width direction. Therefore, when the fastening tape is fixed to the front waistline region, the outer edge of the rear waistline region is easily pulled closer to the front side of the wearer's body. By pulling the outer edge of the rear waist region to the front side of the wearer's body, the waist stretchable portion is extended, and the rear end edge of the disposable disposable diaper can be attached to the wearer's body.

The length of the outer sheet in the width direction is lengthened from the crotch region toward the rear end edge of the disposable disposable diaper. More specifically, the length of the outer sheet in the region in which the pair of fastening tapes are disposed is longer in the width direction of the outer sheet than in the region lower than the low basis weight region of the absorbent core. Since the length of the region in which the fastening tape is disposed is long in the width direction, even if the waist elastic portion contracts, the fastening tape is likely to be located outside the width direction of the absorbent core. The absorbent core is the area where the wearer is placed when installed. By arranging the adhesive tape on the outer side in the width direction of the absorbent core, the adhesive tape is prevented from being disposed between the wearer's body and the absorbent core, and the adhesive tape is prevented from causing irritation to the skin.

(2) The composition of the waist expansion joint and the joint

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

The rear end edge of the waist elastic portion 85 coincides with the rear end edge of the disposable disposable diaper. The front end edge of the waist stretchable portion 85 is located on the front side of the rear end edge of the absorbent core 40a, and is located on the front side of the rear end edge of the core wrap 40b. At least a portion of the waist stretchable portion 85 overlaps the absorbent core 40a in a plan view of the disposable disposable diaper. Further, the waist stretchable portion 85 extends across the rear end edge of the absorbent core 40a and the rear end edge of the core wrap 40b, and extends further toward the front side than the rear end edge of the absorbent core 40a and the rear end edge of the core clad 40b. The outer edge of the waist elasticized portion 85 is located on the inner side in the width direction of the inner edge (the inner end in the width direction) of the fastening tape. The waist elastic portion 85 and the fastening tape 90 are separated in the width direction. By separating the waist elastic-contraction portion 85 and the fastening tape 90 in the width direction, it is easier for the wearer to grasp the room for the waist-contracting portion to expand and contract, and it is easier to operate the fastening tape.

The waist elasticized portion is located on the non-skin opposing side of the absorbent core 40a. In the present embodiment, the waist stretchable portion is disposed between the exterior sheet 60 and the back sheet 60a. The position of the waist elasticized portion is not particularly limited. Further, the region where the absorber is not disposed may be disposed between the side flaps 70 and the back sheet 60a or the exterior sheet 60. In this embodiment, it is located at the waist The skin surface sheet on the skin facing side of the surrounding stretchable portion includes a top sheet 50, side flaps 70, and a back sheet 60a. The non-skin surface sheet on the non-skin facing surface side of the waist elasticized portion includes the exterior sheet 60.

A joint portion is formed in a region where the waist elasticized portion is disposed. The joint portion is formed in a region where the waist elastic portion 85 is disposed. The joint portion 87 is a heat-sealed joint of the waist stretchable portion 85 and the sheet material that overlaps the waist stretchable portion 85. Further, the joint portion is not only a portion joined by heat sealing, but may be a portion joined by another welding 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 exterior sheet 60. In the region where the top sheet 50 and the waist stretch unit overlap, the joint portion joins the top sheet 50, the waist stretch unit, the back sheet 60a, and the exterior sheet 60. The joint portion joins the side flap 70, the waist stretchable portion, the back sheet 60a, and the exterior sheet 60 in a region where the side flap 70 and the waist stretchable portion overlap.

The joint portion 87 has a dot shape in a plan view of the disposable paper diaper after use. The joint formed by heat sealing is thinned, so that the air permeability of the portion is lowered. By arranging the joint portion in a dot shape, it is possible to ensure air permeability in the peripheral region of the joint portion and to suppress a decrease in the air permeability of the waist circumference. The joint portions 87 are arranged side by side in the longitudinal direction L. The joint portion has a center joint portion 871 disposed in a fourth region R4 to be described later, and a side joint portion 872 disposed in a third region R3 to be described later. The central joint portion 871 is displaced from the center joint portion 871 adjacent to the width direction in the longitudinal direction. That is, the center joint portion 871 is arranged in a lattice shape. Compared with the part provided with the joint The portion where the joint portion is not provided has high rigidity and the stretchability of the waist stretchable portion is lowered. Since the center joint portion 871 is arranged in a lattice shape, compared with the configuration in which the center joint portion 871 is continuously disposed, the stress reduction in the width direction can be suppressed and the rigidity in the longitudinal direction can be improved.

The side joint portion 872 is aligned with the side joint portion 872 adjacent to the width direction in the longitudinal direction. The center joint portion 871 and the side joint portion 872 are disposed at intervals along the longitudinal direction L and the width direction W. The interval D1 in the longitudinal direction of the center joint portion 871 is larger than the interval D2 in the longitudinal direction of the side joint portion 872. The interval D3 in the width direction of the center joint portion 871 is larger than the interval D4 in the width direction of the side joint portion 872. The interval D1 in the longitudinal direction of the center joint portion 871 coincides with the interval D3 in the width direction of the center joint portion. Further, the interval D2 in the longitudinal direction of the side joint portion coincides with the interval D4 in the width direction of the side joint portion.

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

The disposable disposable diaper has a pair of first region R1, The two outer edges of the waist elastic-contraction portion 85 extend toward the inner side in the width direction; the second region R2 extends rearward from the front end edge of the waist elastic-contraction portion 85; and the plurality of third regions R3 are located wider than the first region R1. The inner side is located further rearward than the second region R2, and the fourth region R4 extends outward in the width direction from the center in the width direction of the disposable disposable diaper on the inner side in the width direction of the third region R3; A plurality of fifth regions R5 are located between the third region R3 and the fourth region R4. In FIG. 4, the first region R1, the second region R2, the third region R3, the fourth region R4, and the fifth region R5 are respectively given oblique lines. Further, the disposable disposable diaper of the present embodiment preferably has 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 elasticized portion 85, and extends from the outer edge toward the inner side in the width direction. 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 third region R3 located at the outermost side in the width direction in the configuration in which the plurality of third regions R3 are disposed) The outer edge of the outer edge is consistent. The first region R1 is located outside the outer edge of the absorbent core 40a in the width direction. The rear end edge of the first region R1 coincides with the rear end edge of the waist elasticized portion 85. The front end edge of the first region R1 coincides with the front end edge of the waist elasticized portion 85. The first region R1 is located outside the absorbent core 40a in the width direction. Further, the joint portion 87 is not provided in the first region R1. Since the joint portion 87 is not provided in the first region R1, the stretchability of the waist stretchable portion 85 of the first region R1 can be maintained.

At least a portion of the first region R1 is disposed to be stretched from the leg The portion of the portion 75 that extends in the longitudinal direction. The region extending from the leg expansion-contraction portion 75 in the longitudinal direction is a region held by two extension lines extending in the longitudinal direction from the rubber fibers on both outer sides in the width direction among the three rubber threads.

The second region R2 is disposed between the pair of first regions R1. The second region R2 is disposed across the center in the width direction of the disposable disposable diaper, and extends outward in the width direction from the center of the disposable diaper in the width direction. The rear end edge of the second region R2 coincides with the front end edge of the third region R3, and coincides with the front end edge of the fourth region R4 and coincides with the front end edge of the fifth region R5. The front end edge of the second region R2 coincides with the front end edge of the waist elasticized portion 85. At least a part of the second region R2 overlaps with a region having a higher basis weight of the absorbent core 40a (a region other than the low basis weight region) and a low basis weight region 110 of the absorbent core 40a. At least a portion of the second region R2 including the rear end edge of the second region R2 is located rearward of the absorbent core 40a. The outer edge of the second region R2 is located outside the absorbent core 40a in the width direction. The joint portion 87 is not provided in the second region R2. Since the joint portion 87 is not provided in the second region R2, the stretchability of the waist stretchable portion 85 of the second region R2 can be 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 spans the outer edge of the absorbent core 40a in the width direction. The rear end edge of the third region R3 coincides with the rear end edge of the waist elasticized portion 85. The front end edge of the third region R3 coincides with the rear end edge of the second region R2. The third region R3 is located rearward of the absorbent core 40a. In the first The 3 region R3 is provided with a side joint portion 872L. The waist elastic-contraction portion 85 is joined to the sheet material via the side joint portion 872, and the stretchability at the side joint portion 872 is lowered. Therefore, the stretchability of the waist stretchable portion 85 of the third region R3 is lower than the region where the joint portion is not provided (the first region R1, the second region R2, and the fifth region R5).

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

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

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

Further, the waist elastic-contraction portion 85 has a region having a high elongation and a region having a low elongation. Specifically, a high stretch region having a high elongation is disposed in the center in the width direction of the waist stretchable portion 85, and a low stretch region having a low elongation is disposed on the outer side in the width direction of the high stretch region, and is disposed outside the width direction of the low stretch region. High stretch area. The outer edge of the high stretch region in the center in the width direction is the outer edge of the fifth region. That is, the fourth region and the fifth region are high stretch regions. The outer edge of the low stretch region is the outer edge of the third region. That is, the third region is a low stretch region. Moreover, the first area is a high stretch area.

The expansion ratio of the waist elasticized portion 85 is changed by the difference in the elongation of the waist elasticized portion and the presence or absence of the joint portion 87. The first region and the fifth region are high stretch regions, and since the joint portion is not provided, the waist stretchable portion 85 has the highest expansion ratio. The fourth region is a high stretch region, but the joint portion is provided, and the expansion ratio is lowered by the joint portion. Therefore, the stretch ratio of the waist stretch portion 85 is lower than that of the first region and the fifth region. Further, the third region is a low stretch region, and the joint portion is provided, and the expansion ratio is lowered by the joint portion, so that the expansion ratio is lower than that of the fourth region.

Further, since the joint portion is not provided in the second region, the expansion ratio is changed only because the elongation of the waist stretch portion is different. Specifically, the center in the width direction (the range in the width direction of the fourth region) is a high stretch region, and the stretch ratio is high. On the other hand, the width direction outer side (the third area and the The range of the width direction of the 5 region is a low stretch region, and the stretch ratio is low.

(3) Manufacturing method of disposable disposable diaper

Next, an example of a method of producing an absorbent article according to the present embodiment will be described. Further, regarding the method not described in the embodiment, an existing method can be used. Further, the production method described below is an example, and it can also be manufactured by another manufacturing method. The method for producing an absorbent article includes at least a constituent member forming step, a constituent member placing step, a joint portion forming step, a leg circumference forming step, and a cutting step.

In the constituent member forming step, constituent members constituting the absorbent article are formed. Specifically, for example, the absorbent material is laminated to form the absorbent body 40 or to form the fastening tape 90.

The constituent member placing step is performed on a fiber web constituting the back sheet, and a stretchable sheet constituting the waist elasticized portion 85 or another web such as a web constituting the top sheet, a leak preventing sheet, an absorbent body, and a leg stretch The portion 75 or the like constitutes a constituent member of the disposable disposable diaper 10. In the component mounting step, the stretch sheets constituting the waist stretchable portion 85 are disposed. The constituent members are placed by the constituent member placing step, thereby forming a continuous body in which the disposable disposable diapers are continuous in the longitudinal direction.

Moreover, as a method of changing the elongation of the waist elastic-contraction part 85, the following method is mentioned, for example. Before the waist elastic-contraction portion 85 is bonded to the back sheet 60a or the like, the waist elastic-contraction portion 85 is extended in the width direction by the gear. When the gear is extended, the gear extension of the region where the elongation is to be lowered (for example, the second region) is weakened. Will want to make the elongation higher The gear extension of the area (for example, the first area and the third area) is strengthened. 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 the gear is extended. The elongation of the region where the reinforcement is extended becomes higher, and the elongation of the region where the elongation is weakened becomes lower.

The joint forming step forms the joint by heat sealing.

The leg circumference forming step cuts the top sheet 50, the outer sheet 60, and the back sheet 60a. Thereby, the leg opening portion 35 disposed in the leg circumference of the wearer is formed. Further, the joint forming step may be performed after the leg circumference forming step.

The cutting step is a continuous body in which the top sheet 50, the back sheet 60a, the absorber 40, and the like are disposed, and is cut into a size of the product in the width direction W. Thereby, the front waist elasticized portion is disposed in the front waistline region 20, and the waist elasticized portion is disposed in the rear waistline region 30 to manufacture the disposable disposable diaper 10.

(4) Function and effect

Since the portion having the high rigidity is formed along the longitudinal direction by the joint portion row of the third region R3, and the region in which the joint portion row is disposed is contracted in the width direction by the waist elastic portion 85, the width direction is interposed therebetween. The space is provided with a plurality of wrinkles extending in the longitudinal direction. Since the wrinkles extending in the longitudinal direction are formed, it is difficult to form wrinkles extending in the width direction. When the wrinkles extending in the width direction are formed, a bending starting point extending in the width direction is formed, so that the rear end edge of the disposable diaper floats to cause leakage of excrement. However, since it is difficult to form wrinkles extending in the width direction, The back edge of the disposable diaper can be suppressed from floating.

Further, since the wrinkles extending in the longitudinal direction are formed, a plurality of bending starting points are formed at intervals in the width direction, and are easily arranged along the circular arc of the waist circumference. Further, since the unevenness is formed by the wrinkles extending in the longitudinal direction, the waist-concave expansion-contraction portion 85 can be attached to the body by the waist-contracting portion 85. Therefore, a gap due to the unevenness is not formed, and leakage of the wearer's back side can be suppressed. Moreover, since the waist elasticized portion is disposed at the rear end edge of the disposable disposable diaper, the rigidity of the rear end edge of the disposable disposable diaper can be improved, and the rear end of the disposable disposable diaper can be prevented. The edge rolled up unexpectedly.

The first region R1 located on the outer side in the width direction of the absorbent core 40a is disposed at a position contacting the waist bone of the wearer's flank. Since the first region R1 is not provided with the joint portion row, the expansion and contraction force of the waist stretchable portion can be maintained, and the stretchability is higher than that of the third region R3 in which the joint portion row is provided. The first region R1 is strongly bonded to the waist bone of the wearer's co-part, thereby improving the fit of the waist. It can reduce the gap between the body and the disposable disposable diaper, and suppress the leakage of excrement.

Since the joint portion 87 is not provided in the second region R2, the expansion and contraction force of the waist stretchable portion 85 can be maintained, and the expansion and contraction force is higher than the third region R3 in which the joint portion row is provided. The second region R2 is more easily stretched and contracted, and the deformation from the side of the absorbent core 40a is absorbed by the second region R2, and the deformation of the absorbent core 40a can be suppressed from being transmitted to the third region R3 or the trailing edge of the disposable disposable diaper. Therefore, the adhesion of the trailing edge of the disposable disposable diaper can be maintained.

It is preferable that the rear end edge of the joint portion row 87L is disposed at the rear end edge of the disposable disposable diaper. Since the wrinkles extending in the length direction reach after use The rear end edge of the disposable diaper makes it difficult to form a bending starting point extending in the width direction at or near the rear end edge of the disposable disposable diaper. Therefore, it is possible to prevent the rear end edge of the disposable disposable diaper from floating due to the origin of the bending extending in the width direction.

It is preferable that at least a part of the second region R2 is disposed later than the absorbent core 40a. At least a part of the second region R2 is disposed between the third region R3 and the absorber. The region located behind the absorbent core 40a is not deformed together with the absorbent body, so that it is difficult to directly transmit the deformation of the absorbent body. The deformation from the side of the absorbent core 40a is absorbed by the second region R2, and the deformation of the absorbent core 40a can be effectively suppressed from being transmitted to the third region R3.

The sheet material joined to the waist stretchable portion by the joint portion preferably includes a skin sheet (the top sheet 50, the side flaps 70, and the back sheet 60a) on the skin facing surface side of the waist stretch unit, and is located at the waist circumference. The non-skin surface sheet (outer sheet 60) on the non-skin facing side of the stretchable portion. The skin surface sheet, the waist stretch portion, and the non-skin sheet are joined through the joint portion. It is possible to suppress the wrinkles caused by the formation of the joint portion on both the skin surface sheet and the non-skin sheet, so that the skin sheet flakes on the rear end edge of the disposable diaper, or the non-skin sheet flakes on the rear end edge of the disposable diaper. . Moreover, by having a thin surface of the skin, it is possible to enhance the touch of the skin in contact with the skin of the infant.

It is preferable that the first region R1 is disposed in a region extending from the leg expansion and contraction portion in the longitudinal direction. When the disposable diaper is manufactured, the elastic member constituting the leg stretch portion is stretched in the continuous state toward the longitudinal direction of the product, and the stretched elastic member is joined to the web (back sheet, outer sheet) Then, after the disposable diapers of the disposable paper diapers are successively continuous in the longitudinal direction, the continuum is cut along the width direction of the product for each product length. According to this manufacturing method, by cutting the continuous body, the elastic member in the stretched state is contracted in the longitudinal direction of the product, leaving only the portion joined to the vicinity of the leg opening portion. In the manufacturing method, the leg stretchable portion is disposed in the region extending from the leg stretch portion in the longitudinal direction, but the leg stretch portion is not disposed in the product state, and the webs holding the leg stretch portion are not joined to each other. .

Since the first region R1 having high stretchability is disposed in the region extending from the leg stretch portion in the longitudinal direction (the joint portion is not provided), the skin sheet and the non-skin sheet are not joined to the body. It is possible to suppress leakage of the area or SAP overflow from the absorbent core.

The fifth region R5 and the fourth region R4 are preferably located on the inner side in the width direction of the outer edge of the absorbent core 40a. The first region R1 having no joint portion, the third region R3 having the joint portion row, the fifth region R5 having no joint portion row, and the joint are disposed from the outer edge of the waist stretchable portion 85 toward the inner side in the width direction. The fourth region R4 of the column. Since the region having a high expansion ratio and the region having a low expansion ratio are alternately arranged, it is possible to suppress the wearer who is too restrained and improve the fit.

In more detail, the fit can be improved when the disposable diaper is installed. When the disposable diaper is installed, the wearer's body is placed in the rear waist region of the disposable diaper in a state where the disposable diaper is unfolded after use. At this point, the wearer's body is placed to cover the absorption The full width of the core 40a. The installer attaches the wearer's body to the full width of the absorbent core 40a, pulls the adhesive strip and fixes it to the front waistline area. At this time, the first region R1 located on the outer side in the width direction of the absorbent core 40a is pulled outward and extended in the width direction. On the other hand, the fourth region R4 and the fifth region R5 located on the inner side in the width direction of the first region R1 are located on the inner side in the width direction of the outer edge of the absorbent core 40a, and the body pressure of the wearer is applied. Therefore, it hardly stretches in the width direction. The portion of the third region R3 that is wider than the outer edge of the absorbent core 40a does not extend, but extends beyond the outer edge of the absorbent core 40a in the width direction. Therefore, the waist-contracting portion of the disposable diaper and the state before the wearer is attached, and the first region R1 and the third region R3 are partially extended, and the other portion of the third region R3 and the fourth region are stretched. R4 and the fifth region R5 hardly stretch.

If the disposable diaper is used after the disposable diaper is installed, 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 easily stretched and contracted compared to the state before the wearer is pulled up. At this time, since the first region R1 of the waist elasticized portion has been stretched and the fourth region R4 is more easily stretched than the fifth region R5, the fourth region R4 is stretched and stretched by the fifth region R5. As a result, the fourth region R4 of the waist elasticized portion in a state in which the wearer is pulled up is attached to the wearer's body with a weak force. Further, similarly, the third region R3 is also attached to the wearer's body with a weak force. Since the region having a high stretch ratio and the region having a low stretch ratio are provided, it is possible to suppress the wearer who is too restrained and improve the fit.

It is preferable that the second region R2 is disposed across the center of the disposable diaper in the width direction. The center of the wearer's back is provided with a back bone, which is more concave toward the ventral side than the left and right parts. The recessed portion (Michael diamond shape) is a recess of the sacral portion, and the second region R2 is disposed at the recessed portion. A portion that is contracted by the second region R2 is disposed in the recessed portion of the wearer. Therefore, it is possible to suppress the occurrence of a gap between the center of the wearer's ridge and the disposable disposable diaper, and more reliably prevent leakage from the recessed portion on the back side.

The areal density of the joint portion of the third region R3 is higher than the surface density of the joint portion of the fourth region R4. Since the area of the joint portion per unit area of the third region R3 is higher than the area of the joint portion per unit area of the fourth region R4, the joint portion of the third region R3 is disposed more densely than the fourth region R4. However, since the elongation of the waist elasticized portion of the fourth region is higher than the elongation of the waist elasticized portion of the third region, the expansion ratio of the waist elasticized portion of the fourth region R4 is larger than that of the waist elasticized portion of the third region R3. The rate has become higher. The sacral portion of the wearer is placed in the recessed portion where the fourth region is contracted. Therefore, it is possible to suppress a gap between the center of the wearer's ridge and the disposable disposable diaper, and to reliably prevent leakage from the recessed portion on the back side.

(5) Modifications

Next, a disposable diaper for use in a modification will be described based on Fig. 5 .

Figure 5 is a rear view of the disposable diaper 10A of the modified embodiment. Large top view. In addition, the disposable diaper after the modification is the same as that of the disposable diaper of the embodiment, and the description is omitted. The disposable diaper 10A after the modification has a plurality of third regions R3 and a plurality of fifth regions R5. Therefore, the rear end edge of the disposable disposable diaper is disposed in order from the center in the width direction of the disposable disposable diaper to the outer side: the fourth region R4 in which the stretch ratio of the waist elasticized portion 85 is low, and the expansion ratio The fifth region R5 is high, the third region R3 having a low expansion ratio, the fifth region R5 having a high expansion ratio, the third region R3 having a low expansion ratio, and the first region R1 having a high expansion ratio.

According to the disposable disposable diaper of the modified example, the wrinkle extending in the longitudinal direction can be formed at the rear end edge of the disposable disposable diaper, and the rear end edge of the disposable disposable diaper can be suppressed from floating. From the beginning, maintain the fit on the back side. Further, since the unevenness can be attached to the body by the waist-contracting portion, the gap caused by the unevenness is not formed, and leakage of the back side of the wearer can be suppressed. In the disposable diaper after the modification, the fifth region R5 is disposed on the extension line of the elastic member 81 of the leg side expansion-contraction portion 80 in the longitudinal direction. Since the joint portion is not disposed on the extension line extending from the elastic member 81 in the longitudinal direction, the elastic member 81 is not fixed to the joint portion at the time of manufacture, and can be disposed in a state in which the elastic member 81 is contracted in the longitudinal direction.

As described above, the content of the present invention has been described by the embodiments of the present invention, but the description and drawings which form a part of this description are not intended to limit the present invention. Throughout this description, those skilled in the art will be able to understand various alternative embodiments, embodiments, and operational techniques. Therefore, according to the above description, the technical scope of the present invention is only based on the invention of the proper patent application scope. Depending on the specific matter.

In addition, the entire contents of the Japanese Patent Application No. 2015-250041, filed on Dec.

[Industrial Applicability]

Provided is a disposable disposable diaper which can improve the fit of the rear end edge of the disposable disposable diaper and suppress leakage of the wearer's back side.

10‧‧‧Disposable disposable diapers

20‧‧‧ Front waist area

25‧‧‧胯下区域区

30‧‧‧After waist area

35‧‧‧ leg opening

40‧‧‧ absorber

50‧‧‧Top sheet (sheet)

70‧‧‧Flanking (sheet material)

75‧‧‧ Leg flexion

80‧‧‧ Leg side expansion and contraction

81‧‧‧Flexible components

85‧‧‧Waist expansion and contraction

90‧‧‧Buckle belt

91‧‧‧Substrate sheet

92‧‧‧ hook sheet

95‧‧‧ Target Department

115‧‧‧1st gap

125‧‧‧2nd gap

200‧‧‧ Pants expansion joint

L‧‧‧ Length direction

W‧‧‧Width direction

Claims (7)

A disposable disposable diaper having a front waistline region, a rear waistline region, and a crotch region between the front waistline region and the rear waistline region; and a length 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 waist region and fixed to the front waist region; and an absorbent core that faces the underarm region toward the front waistline At least one of the region and the rear waistline region extends; the waist stretchable portion is disposed at a rear end edge of the disposable disposable diaper, and expands and contracts in the width direction; the sheet material is superposed on the waist stretchable portion; and the joint portion In the column, the joint portion of the waist stretchable portion and the sheet material is disposed at intervals in the longitudinal direction, and the joint portion row is disposed at intervals in the width direction, and the disposable diaper is disposed. The first region extends from the outer side edges of the waist elastic-contracting portion toward the inner side in the width direction, and does not have the joint portion; The second region extends rearward from the front end edge of the waist elastic-contraction portion, and does not have the joint portion; and the third region is located on the inner side in the width direction of the first region and behind the second region, and has the aforementioned Joint column, The first region is located on the outer side in the width direction of the absorbent core. A disposable disposable diaper according to claim 1, wherein the rear end edge of the joint portion row is disposed at a rear end edge of the disposable disposable diaper. A disposable diaper according to claim 1 or 2, wherein at least a part of the second region is disposed further rearward than the absorbent core. The disposable diaper according to claim 1 or 2, wherein the sheet material comprises: a skin surface sheet located on the skin facing surface side of the waist stretching unit; and a non-skin facing surface located in the waist stretching unit Non-skin facial sheet on the side. A disposable disposable diaper according to claim 4, wherein the leg stretchable portion is disposed in a leg circumference of the wearer and stretches in a longitudinal direction, and at least a part of the first region is disposed to be stretched from the leg portion The area that extends toward the length. A disposable disposable diaper according to claim 1 or 2, further comprising: a fourth region, the inner side in the width direction of the third region, from the center of the width direction of the disposable disposable diaper Extending outward in the width direction, the joint portion row and the fifth region are located between the third region and the fourth region, and do not have the joint portion, and the fifth region and the fourth region are located in the absorbent core The outer edge is more inward in the width direction. Disposable disposable diapers as claimed in claim 1 or 2, wherein The second region is disposed across the center of the width direction of the disposable disposable diaper.