TWI716504B - Disposable diapers - Google Patents

Abstract

Disposable disposable diapers (10), with: front waist area (20), back waist area (30), crotch area (25), a pair of hook and loop fasteners (90), absorbent core (40a), configuration The waist stretch part (85) that stretches in the width direction at the rear edge of the disposable paper diaper, the sheet material stacked on the waist stretch part, and the joint part row (87L), the joint part row (87L) The joint part (87) which joins the waist stretch part and the sheet material is arranged at intervals in the longitudinal direction. A plurality of joint portion rows are arranged at intervals in the width direction. Disposable disposable diapers and have: the first area (R1), which extends from the outer edges of the waist stretch part toward the inner side in the width direction, and does not have a joint part row; the second zone (R2), from the waist stretch part The front end edge extends rearward and does not have a joining section row; and the third region (R3) is located on the inner side in the width direction than the first region and behind the second region and has a joining section row. The first region is located on the outer side in the width direction than the absorbent core.

Description

Disposable diapers

The present invention relates to disposable diapers.

A disposable paper diaper is disclosed, which has embossed rows between the fastening tapes in the back waist area. The embossed rows are arranged along the length direction, and a plurality of them are arranged at intervals in the width direction.

Advanced technical literature Patent literature

Patent Document 1: Japanese Patent Application Publication No. 2014-90902

In the disposable paper diaper of Patent Document 1, the rigidity of the area where the embossed row is provided is higher than the rigidity of the area where the embossed row is not provided. Therefore, the disposable paper diaper of Patent Document 1 has wrinkles due to the embossed rows. Because of the wrinkles between the hook and loop fasteners, unevenness is formed, so there is a gap between the rear edge of the disposable diaper and the body due to the unevenness. Because after use A gap is formed between the rear edge of the disposable diaper and the body, and there is a risk of leakage of excrement on the back of the wearer.

Therefore, the present invention was developed in view of the above-mentioned problems, and its purpose is to improve the fit of the rear end edge of disposable paper diapers and to suppress leakage from the back of the wearer.

The disposable paper diaper (disposable paper diaper 10) of the present invention mainly has: front waist area (front waist area 20); back waist area (rear waist area 30); crotch area (under crotch) Region 25), located between the front waist region and the rear waist region; the longitudinal direction from the front waist region toward the rear waist region (length direction L); the width direction (width direction W) orthogonal to the length direction A pair of hook and loop fasteners (Hook and Loop 90), which extend along the width direction in the aforementioned back waist area, and are fixed to the front waist area; the absorbent core (absorbent core 40a), which straddles the sub-crotch area toward the front waist At least one of the area and the back waist area extends; the waist stretchable portion (waist stretchable portion 85) is arranged on the rear edge of the disposable disposable diaper and stretches in the width direction; the sheet material is stacked on the waist And the joint row (joint row 87L), the joint (joint 87) that joins the waist stretchable portion and the sheet material is arranged at intervals in the longitudinal direction; and the joint row is along the width direction A plurality of disposable paper diapers 10 are arranged at intervals, and the disposable paper diaper 10 has: a first region (R1), which extends from both outer edges of the waist stretch part toward the inner side in the width direction, and does not have the joint part row; Area 2 (R2), which extends from the front end edge of the waist expansion and contraction portion toward the rear, does not have the aforementioned joint portion row; and The third region (R3) is located on the inner side in the width direction than the first region and behind the second region, and has the joining portion row; the first region is located on the outer side in the width direction than the absorbent core.

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

10: disposable diapers

20: Front waist area

25: sub-crotch area

30: back waist area

40: Absorber

40a: Absorbent core

40b: core cladding

50: Top sheet (thin sheet)

60: Exterior sheet (thin sheet)

60a: back sheet (thin sheet)

70: side wings (thin sheet)

85: Waist extension

87: Joint

87L: Joint row

871: Central joint (first joint means)

871L: Central joint row

872: Side joint part (second joint means)

872L: Side joint row

90: Velcro

L: length direction

W: width direction

R1: Zone 1

R2: Zone 2

R3: Zone 3

Fig. 1 is an exploded top view of the disposable paper diaper of this embodiment.

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

3 is a cross-sectional view of the disposable paper diaper shown in FIG. 1 along the line F2-F2.

Fig. 4 is an enlarged, expanded top view of the rear edge of the disposable paper diaper shown in Fig. 1.

Fig. 5 is an enlarged development plan view of the rear end edge of the disposable paper diaper of the modified example.

Next, an embodiment of the disposable paper diaper 10 of the present invention will be described with reference to the drawings. In addition, in the description of the following drawings, the same or similar symbols are assigned to the same or similar parts. However, the drawing is a schematic diagram, and it should be noted that the ratio of each size is different from the actual product.

Therefore, the specific dimensions should be judged with reference to the following description. In addition, the drawings may also include parts with different dimensional relationships or ratios.

(1) Overall structure of disposable diapers

Fig. 1 is an expanded plan view of the disposable paper diaper 10 of this embodiment. Figure 2 is a cross-sectional view of the disposable paper diaper shown in Figure 1 along the line F1-F1. 3 is a cross-sectional view of the disposable paper diaper shown in FIG. 1 along the line F2-F2. Fig. 4 is an enlarged top view of the rear end edge of the disposable paper diaper shown in Fig. 1. The expanded view shown in Figures 1 and 4 is until the top sheet 50, side flaps 70, etc. constituting the disposable paper diaper are not wrinkled, so that the elasticity of the leg stretchable portion 75 and the leg-side stretchable portion 80 Diagram showing the state of the component being stretched.

The disposable diaper 10 has a front waist area 20, a crotch area 25, and a back waist area 30. The front waist region 20 is a part that contacts the front waist (abdominal part) of the wearer. In addition, the back waist area 30 is a part that contacts the back waist part (back part) of the wearer. The crotch area 25 is located between the front waist area 20 and the back waist area 30.

A pair of leg openings 35 are formed in the disposable paper diaper 10. The leg openings 35 are provided at the lateral ends of the disposable paper diaper in the width direction. The disposable paper diaper is worn on the wearer and is the part arranged along the leg circumference of the wearer .

In addition, in this embodiment, the direction from the front waist region 20 to the rear waist region 30 is referred to as the longitudinal direction L, which is aligned with the longitudinal direction L The direction of intersection is called the width direction W.

The disposable paper diaper 10 has an absorber 40. The absorbent body 40 has an absorbent core 40a and a core covering layer 40b. The absorbent core 40 a spans the sub-crotch region 25 and extends from the sub-crotch region 25 toward at least one of the front waist region 20 and the rear waist region 30.

The absorbent core 40a can be appropriately constructed using well-known members or materials such as pulverized pulp or superabsorbent polymer, similarly to conventional disposable paper diapers. The absorbent core 40a is covered with a sheet-like core covering layer 40b. The core layer 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 covering layer 40b are approximately the same, and the front end edge of the absorbent core 40a and the front end edge of the core covering layer 40b are approximately the same. In more detail, the distance between the rear edge of the absorbent core 40a and the rear edge of the core-cladding layer 40b is 5 mm or less, and the distance between the front edge of the absorbent core 40a and the front-end edge of the core-cladding layer 40b is 5 mm or less.

As shown in FIG. 4, a low basis weight region 110 in which the basis weight of the absorbent material is lower than other parts of the absorbent core 40a is formed in the absorbent core 40a. The low basis 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 basis weight region 110 in the width direction W becomes wider toward the rear end edge of the absorbent core 40a. More specifically, when the disposable paper diaper 10 is viewed from above, the low basis weight region 110 is wedge-shaped. When shrinking in the width direction by the waist expansion and contraction 85 described later, the low basis weight region 110 shrinks more easily than the surrounding area, and the rear end of the absorbent core 40a forms a cup shape along the wearer's buttocks.

Provided on the surface side (skin facing side) of the absorber 40 Liquid permeability top sheet 50. Furthermore, the back sheet 60a which is liquid impermeable is provided in the back side (non-skin facing surface side) of the absorber 40. An exterior sheet 60 is provided on the back side of the back sheet 60a. The front edge of the back sheet is located further behind the front edge of the disposable diaper, and the rear edge of the back sheet is located forward than the rear edge of the disposable diaper.

The outer edge (outer end in the width direction) of the absorber 40 is provided with side flaps 70, respectively. The side flap 70 spans the front waist region 20, the crotch region 25, and the rear waist region 30, and is arranged on the outer side in the width direction than the absorber 40. The side flap 70 is composed of a non-woven fabric in which a plurality of sheets of one or more sheets are stacked. The side flap 70 is located closer to the skin-facing surface than the absorbent core 40a, and extends outward in the width direction relative to the absorbent core 40a.

The side flap 70 is provided with a pair of leg expansion-contraction parts 75 which are arrange|positioned at the inner side of the width direction rather than the leg part opening part 35, and can expand and contract in the longitudinal direction L. As shown in FIG. The leg expansion-contraction portions 75 are respectively arranged on the inner side in the width direction than the left and right leg openings. The leg stretchable portion 75 is composed of a stretchable sheet, 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, and may be composed of a stretchable sheet composed of nonwoven fabric. It is preferable that the leg expansion-contraction part 75 is comprised so that the leg opening part 35 can expand and contract in a longitudinal direction.

The position in the width direction of the leg stretchable portion 75 may also be changed. Specifically, the distance between the inner ends of the left and right pair of leg stretch parts in the product width direction W is preferably wider from the crotch area 25 to the front waist area 20, and as it goes from the crotch area 25 to the back waist area The area 30 becomes wider. The leg extensions are arranged so that the lower part of the crotch becomes narrower and the waist becomes wider toward the front and back The shape of the flexure allows the leg extensions to follow the line of the body, and the leg extensions are properly stretched and arranged around the wearer’s leg circumference.

On the inner side of the width direction of the pair of leg expansion and contraction portions 75, a pair of leg side expansion and contraction portions 80 extending along the longitudinal direction L are provided. The leg-side stretchable portion 80 is arranged at the inner end portion in the width direction of the side flap 70, has an elastic member 81 that stretches in the longitudinal direction, and has standing stretchable wrinkles.

In addition, the disposable paper diaper 10 includes a crotch stretchable portion 200 arranged in a region overlapping with the absorber in the crotch region 25. The crotch stretch part 200 is configured to maintain a flat shape in a part of the crotch region 25 when the disposable diaper is worn compared to other parts of the absorber 40. The crotch stretchable portion 200 is configured to be stretchable in at least the longitudinal direction L or the width direction W.

A first notch 115 and a second notch 125 are formed in the absorbent core 40a in the sub-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 part where the absorbent material does not exist. The first notch 115 and the second notch 125 are notched shapes extending from the outer edge of the absorbent core 40a toward the inner side in the width direction, respectively.

The hook and loop strips 90 are a pair, extend in the width direction W in the back waist area 30, and are fixed to the non-skin facing surface of the front waist area 20, thereby holding the disposable diaper 10 on the wearer's body. The hook and loop fastener 90 is installed in the area of the side flap 70 corresponding to the back waist area 30. The hook and loop tape 90 includes a base sheet 91 connected to the side flap 70 and a hook sheet 92 fixed to the base sheet 91 by providing a plurality of engaging hooks (not shown). The hook sheet 92 is provided with an area for engaging the hook.

The target portion 95 is provided on the surface of the exterior sheet 60 of the front waistline region 20 on the non-skin facing side. The target portion 95 is configured to engage the engaging hook of the hook and loop fastener 90 and function as a loop of a hook and loop locking system. For the target portion 95, for example, a hot-air nonwoven fabric can be used. In addition, the disposable paper diaper may be configured to fix the hook-and-loop fastener 90 to the exterior sheet 60 of the front waist area 20 without having a target portion.

The disposable paper diaper 10 has a waist stretchable part that can stretch in the width direction. The waist expansion-contraction part 85 is arrange|positioned in the back waist area. The waist expansion-contraction part 85 is arrange|positioned between a pair of hook-and-loop fasteners 90 in the width direction, and is contracted in the width direction between the hook-and-loop fasteners 90. As shown in FIG. The front end edge of the waist expansion-contraction portion 85 has a curved shape in which the center in the width direction is recessed toward the rear.

In this embodiment, the waist stretchable part is formed of a stretchable sheet, and for example, stretchable film, stretchable nonwoven fabric, and urethane can be used. The waist expansion-contraction part 85 can also be comprised by the expansion-contraction nonwoven fabric. The waist expansion-contraction part 85 composed of a stretchable nonwoven fabric is easier to maintain the air permeability around the waist of an infant than a waist expansion-contraction part composed of a stretchable film. In addition, the waist expansion-contraction part is a part that expands and contracts substantially in the width direction, and the concept of the part where the stretchable sheet is arranged in a state where the expansion force is not exerted is eliminated. Therefore, the outer edge of the waist stretchable part described later is not the outer edge of the stretchable sheet, but the outer edge of the stretched part. In this embodiment, a stretchable film having a basis weight of 20 to 45 g/m ² is used for the waist stretch part. However, the waist expansion-contraction part 85 may be comprised by other structures, such as a plurality of rubber threads. The waist stretch part is stretched to a predetermined magnification relative to the length of the non-stretched state (natural state), and then attached to the back sheet 60a by a hot melt adhesive or heat treatment. About the waist expansion-contraction part, it demonstrates in detail later.

In addition, the disposable paper diaper is provided with a plurality of joint parts that joint the waist stretch part and the sheet material. The joining part 87 joins the waist expansion-contraction part 85 and the sheet material overlapping with the waist expansion-contraction part 85. The junction part will be described in detail later.

The outer edge of the rear waist region of the exterior sheet is located on the outer side in the width direction than the outer edge of the front waist region of the exterior sheet. The outer edge of the exterior sheet is tied to the outer edge of the area of the disposable paper diaper where the hook and loop fastener is removed. The length in the width direction of the rear waist region of the exterior sheet is longer than the length in the width direction of the front waist region of the exterior sheet. Therefore, when the hook and loop fastener is fixed to the front waist area, it is easy to draw the outer edge of the back waist area closer to the front side of the wearer's body. By pulling the outer edge of the back waist area closer to the front side of the wearer's body, the waist stretchable portion is stretched to fit the rear end edge of the disposable diaper to the wearer's body.

The length in the width direction of the exterior sheet becomes longer from the crotch area toward the rear edge of the disposable diaper. In more detail, the length in the width direction of the outer cover sheet in the area where the pair of hook and loop fasteners is arranged is longer than the length in the width direction of the outer cover sheet in the area ahead of the low basis weight area of the absorbent core. Since the area where the hook and loop fastener is arranged has a longer length in the width direction, the hook and loop fastener tends to be located on the outer side in the width direction than the absorbent core even if the waist elasticity shrinks. The absorbent core is the area where the wearer is placed during installation. By arranging the hook and loop fastener on the outside in the width direction than the absorbent core, the hook and loop fastener is prevented from being placed between the wearer's body and the absorbent core, and the skin irritation caused by the hook and loop fastener can be suppressed.

(2) The composition of the waist stretch and joint

The waist stretch portion 85 extends from the center of the disposable paper diaper in the width direction toward both outer sides in the width direction, and is composed of stretchable sheets extending in the width direction. The waist expansion and contraction part of this embodiment is configured to expand and contract in the width direction, but the waist expansion and contraction part may be configured to expand and contract in the width direction and the length direction.

The rear end edge of the waist expansion-contraction part 85 is consistent with the rear end edge of the disposable diaper. The front end edge of the waist expansion-contraction part 85 is located more front than the rear-end edge of the absorbent core 40a, and is located more front than the rear-end edge of the core layer 40b. In the plan view of the disposable paper diaper, at least a part of the waist stretch portion 85 overlaps the absorbent core 40a. In addition, the waist elasticity portion 85 spans the rear end edge of the absorbent core 40a and the rear end edge of the core covering layer 40b, and extends to the front side than the rear end edge of the absorbent core 40a and the rear end edge of the core covering layer 40b. The outer edge of the waist expansion-contraction portion 85 is located on the inner side in the width direction than the inner edge (the inner end in the width direction) of the hook and loop fastener. The waist elasticity 85 and the hook and loop tape 90 are separated in the width direction. Since the waist elasticity 85 and the hook and loop fastener 90 are separated in the width direction, it is easier for the wearer to grasp the flexibility of the waist elasticity and to operate the hook and loop fastener.

The waist expansion-contraction part is located on the non-skin facing surface side of the absorbent core 40a. In the present embodiment, the waist elasticity portion is arranged between the exterior sheet 60 and the back sheet 60a. The position of the waist expansion part is not particularly limited. In addition, in a region where the absorber is not arranged, it may be arranged between the side flap 70 and the back sheet 60a or the exterior sheet 60. In this embodiment, the waist The skin surface sheet on the side facing the skin of the surrounding stretchable portion includes a top sheet 50, a side flap 70, and a back sheet 60a. The non-skin surface sheet located on the non-skin facing surface side of the waist expansion and contraction portion includes the exterior sheet 60.

The junction part is formed in the area|region where the waist expansion-contraction part is arrange|positioned. The joining part is formed in a region where the waist expansion-contraction part 85 is arranged. The joining part 87 is a sheet material which joins the waist expansion-contraction part 85 and the waist expansion-contraction part 85 by heat sealing. In addition, the joining part is not only a part joined by heat sealing, but also a part joined by other welding methods such as ultrasonic welding or an adhesive.

The sheet material is specifically the top sheet 50, the side flaps 70, the back sheet 60a, and the exterior sheet 60. In the area where the top sheet 50 and the waist stretchable portion overlap, the joint portion joins the top sheet 50, the waist stretchable portion, the back sheet 60a, and the exterior sheet 60. In the region where the side flap 70 and the waist stretchable portion overlap, the joint portion joins the side flap 70, the waist stretchable portion, the back sheet 60a, and the exterior sheet 60.

In the plan view of the disposable paper diaper, the joint 87 is dot-shaped. The joint formed by heat sealing becomes thinner, so that the air permeability of the part is reduced. By arranging the joint part in a dot shape, it is possible to ensure the air permeability in the area around the joint part, and suppress the decrease in the air permeability of the waist. The joining parts 87 are aligned along the longitudinal direction L. The junction part has a center junction part 871 arrange|positioned in the 4th area|region R4 mentioned later, and the side junction part 872 arrange|positioned in the 3rd area|region R3 mentioned later. The central joining portion 871 is displaced in the longitudinal direction with respect to the central joining portion 871 adjacent to the width direction. That is, the central joint 871 is arranged in a lattice shape. The part with the joint is compared with The part where the joint is not provided has high rigidity, and the stretchability of the waist stretchable part is reduced. Since the central joining parts 871 are arranged in a lattice shape, compared to a configuration in which the central joining parts 871 are continuously arranged, it is possible to suppress a decrease in the stress in the width direction and increase the rigidity along the longitudinal direction.

The side joint portion 872 and the side joint portion 872 adjacent in the width direction are aligned in the longitudinal direction. The central joint 871 and the side joint 872 are arranged along the longitudinal direction L and the width direction W with an interval therebetween. The interval D1 in the longitudinal direction of the central joint 871 is larger than the interval D2 in the longitudinal direction of the side joint 872. The interval D3 in the width direction of the center joint 871 is larger than the interval D4 in the width direction of the side joint 872. The interval D1 in the longitudinal direction of the central joint 871 coincides with the interval D3 in the width direction of the central joint. In addition, the interval D2 in the longitudinal direction of the side joint part coincides with the interval D4 in the width direction of the side joint part.

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

The disposable diaper has: a pair of first regions R1, Extending from both outer edges of the waist expansion and contraction portion 85 toward the inner width direction; the second region R2 extends from the front end edge of the waist expansion and contraction portion 85 toward the rear; and a plurality of third regions R3 are located in the width direction than the first region R1 The fourth region R4 is located on the inner side in the width direction than the third region R3, and extends from the center in the width direction of the disposable diaper toward the outer side in the width direction; and The 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 different diagonal lines. In addition, the disposable paper diaper of the present embodiment preferably has at least a first region R1, a second region R2, and a third region R3.

The first region R1 is arranged in the entire lengthwise area of the outer edge of the waist stretchable portion 85 and extends from the outer edge to 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 is the same as the outer edge of the third region R3 (in a configuration in which a plurality of third regions R3 are arranged, the third region R3 located at the outermost in the width direction The outer edge) is consistent. 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 end edge of the first region R1 coincides with the rear end edge of the waist elasticity 85. The front end edge of the first region R1 coincides with the front end edge of the waist elasticity 85. The first region R1 is located on the outer side in the width direction than the absorbent core 40a. In addition, the junction 87 is not provided in the first region R1. Since the joint 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 part of the first region R1 is arranged to extend and contract from the leg The area where the portion 75 extends in the longitudinal direction. The area extending from the leg expansion and contraction portion 75 in the longitudinal direction is an area sandwiched by two extension lines extending in the longitudinal direction from the rubber threads located on both outer sides in the width direction among the three rubber threads.

The second region R2 is arranged between the pair of first regions R1. The second region R2 is arranged across the center in the width direction of the disposable paper diaper, and extends from the center in the width direction of the disposable paper diaper to the outside in the width direction. The rear edge of the second region R2 coincides with the front edge of the third region R3, the front edge of the fourth region R4, and the front edge of the fifth region R5. The front end edge of the second region R2 coincides with the front end edge of the waist elasticity 85. At least a part of the second region R2 overlaps the high basis weight region of the absorbent core 40a (region other than the low basis weight region) and the low basis weight region 110 of the absorbent core 40a. At least a part of the second region R2 including the rear end edge of the second region R2 is located behind the absorbent core 40a. The outer edge of the second region R2 is located on the outer side in the width direction than the absorbent core 40a. The junction 87 is not provided in the second region R2. Since the junction part 87 is not provided in the 2nd area R2, the stretchability of the waist expansion-contraction part 85 of the 2nd area R2 can be maintained.

The third region R3 extends from the inner edge of the first region R1 toward the inner side in the width direction. The inner edge of the third region R3 coincides with the outer edge of the fifth region R5. The third region R3 straddles the outer edge of the absorbent core 40a in the width direction. The rear end edge of the third region R3 coincides with the rear end edge of the waist elasticity 85. The front edge of the third region R3 coincides with the rear edge of the second region R2. The third region R3 is located behind the absorbent core 40a. In the The 3 region R3 is provided with a side joint portion row 872L. The waist elasticity portion 85 is joined to the sheet via the side joining portion 872, and the stretchability at the side joining portion 872 is reduced. Therefore, the elasticity of the waist elasticity part 85 of the 3rd region R3 is lower than the region (1st region R1, 2nd region R2, and 5th region R5) without a junction part.

The fourth region R4 is arranged 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 elasticity 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. A central junction row 871L is provided in the fourth region R4. The stretchability of the waist stretchable portion 85 of the fourth region R4 is lower than that of the region (the first region R1, the second region R2, and the fifth region R5) where the joint is not provided.

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

The fifth region R5 is arranged 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 elasticity 85. The front edge of the fifth region R5 coincides with the rear edge of the second region R2. The fifth region R5 is located behind the absorbent core 40a. The fourth region R4 and the fifth region R5 are located on the inner side in the width direction than the outer edge of the absorbent core 40a. No junction 87 is provided in the fifth region R5. Since the junction part 87 is not provided in the 5th region R5, the stretchability of the waist expansion-contraction part 85 of the 5th region R5 can be maintained.

In addition, the waist elasticity portion 85 has a region with a high elongation rate and a region with a low elongation rate. Specifically, a high stretch area with a high elongation rate is arranged at the center of the waist elasticity portion 85 in the width direction, a low stretch area with a low elongation rate is arranged outside the high stretch area in the width direction, and a low stretch area is arranged outside in the width direction 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 area and the fifth area are high stretch areas. The outer edge of the low stretch area is the outer edge of the third area. That is, the third area is a low stretch area. And, the first area is a high stretch area.

Due to the difference in the elongation rate of the waist expansion and contraction portion and the presence or absence of the joint 87, the expansion and contraction rate of the waist expansion and contraction portion 85 changes. The first area and the fifth area are high stretch areas, and since no joint is provided, the expansion ratio of the waist expansion and contraction portion 85 is the highest. The fourth area is a high stretch area, but a joint is provided. Since the joint lowers the expansion ratio, the expansion ratio of the waist expansion and contraction part 85 is lower than that of the first and fifth areas. In addition, the third area is a low stretch area, and a joint is provided. Since the joint lowers the expansion ratio, the expansion ratio is lower than the fourth area.

Moreover, since the second region is not provided with a joint, the expansion ratio changes only because the elongation ratio of the waist expansion and contraction part 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 expansion ratio is high. On the other hand, the outside in the width direction (the third area and the The range in the width direction of the area 5) is a low stretch area, and the expansion ratio is low.

(3) Manufacturing method of disposable diapers

Next, an example of the manufacturing method of the absorbent article of this embodiment is demonstrated. In addition, with regard to methods not described in this embodiment, existing methods can be used. In addition, the manufacturing method described below is an example, and it can also be manufactured by other manufacturing methods. The manufacturing method of an absorbent article includes at least a constituent member forming step, a constituent member placing step, a joining 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, an absorbent material is laminated to form an absorber 40 or a hook and loop tape 90 is formed.

The step of placing the constituent members is on the fiber web constituting the back sheet, and placing: the elastic sheet constituting the waist elastic portion 85, or other fiber nets such as the fiber net constituting the top sheet, leak-proof sheets, absorbers, leg stretch The portion 75 and the like constitute constituent members of the disposable paper diaper 10. The component placing step is to arrange the stretchable sheet constituting the waist stretchable portion 85. The constituent members are placed in the constituent member placement step, thereby forming a continuous body in which the disposable paper diaper is continuous in the longitudinal direction.

In addition, as a method of changing the elongation rate of the waist expansion-contraction part 85, the following method is mentioned, for example. Before attaching the waist expansion-contraction part 85 to the back sheet 60a etc., the waist expansion-contraction part 85 is extended in the width direction by a gear. When the gear is extended, the extension of the gear in the region (for example, the second region) where the elongation rate is to be lowered is weakened. Will want to make the elongation higher The extension of the gear in 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 extensions of the gear. The elongation of the region where the extension is strengthened becomes higher, and the elongation of the region where the extension is weakened becomes lower.

The joining portion forming step is to form the joining portion by heat sealing.

The leg circumference forming step is to cut the top sheet 50, the exterior sheet 60, and the back sheet 60a. Thereby, the leg openings 35 arranged around the legs of the wearer are formed. In addition, the joining portion forming step may be performed after the leg circumference forming step.

The cutting step is to cut the continuum configured with the top sheet 50, the back sheet 60a, the absorbent body 40, etc., into the size of a product along the width direction W. Thereby, the front waist elasticity portion is arranged in the front waist area 20 and the waist elasticity portion is arranged in the rear waist area 30 to manufacture the disposable paper diaper 10.

(4) Function and effect

Since the junction row of the third region R3 forms a portion with higher rigidity along the longitudinal direction, and the waist elastic portion 85 shrinks the area where the junction row is arranged in the width direction, it is spaced in the width direction. A plurality of creases extending in the longitudinal direction are provided at intervals. Since creases extending in the longitudinal direction are formed, it is difficult to form creases extending in the width direction. If a wrinkle extending in the width direction is formed, a bending start point extending in the width direction will be formed. Therefore, the rear edge of the diaper may float up and excrement may leak out. However, since it is not easy to form wrinkles extending in the width direction, It can suppress the floating of the rear edge of the diaper.

In addition, since the wrinkles extending in the longitudinal direction are formed, a plurality of bending start points are formed at intervals in the width direction, and it is easy to arrange along the arc of the waist. In addition, although irregularities are formed by the wrinkles extending in the longitudinal direction, the irregularities can be fitted to the body by the waist elastic portion 85, so there is no gap due to irregularities, and leakage of the wearer's back can be suppressed. In addition, since the rear edge of the disposable diaper is provided with a waist expansion part, the rigidity of the rear edge of the disposable diaper can be increased, and the rear end of the disposable diaper can be prevented Yuan rolled up unexpectedly.

The first region R1 located on the outer side in the width direction of the absorbent core 40a is arranged at a position in contact with the waist of the wearer's side. Since the first region R1 is not provided with the joint section row, the expansion and contraction force of the waist expansion and contraction section can be maintained, which is higher than that of the third region R3 where the joint section row is provided. The first region R1 is used to strongly fit 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 diaper, and inhibit the leakage of excrement.

Since the second region R2 is not provided with the joining portion 87, the elasticity of the waist expansion and contraction portion 85 can be maintained, and its expansion and contraction force is higher than that of the third region R3 where the joining portion row is provided. The second region R2 is relatively easy to expand and contract, and the second region R2 absorbs deformation from the side of the absorbent core 40a, and can suppress the deformation of the absorbent core 40a from being transmitted to the third region R3 or the rear end edge of the disposable diaper. Therefore, it is possible to maintain the adhesion of the rear end edge of the disposable paper diaper.

The rear end edge of the joining portion row 87L is preferably arranged on the rear end edge of the disposable diaper. After use due to wrinkles extending in the length direction The rear edge of the disposable diaper makes it difficult for the rear edge of the disposable diaper or its vicinity to form a bending start point extending in the width direction. Therefore, it is possible to prevent the rear end edge of the disposable paper diaper from floating due to the bending start point extending in the width direction.

At least a part of the second region R2 is preferably arranged behind the absorbent core 40a. At least a part of the second region R2 is arranged between the third region R3 and the absorber. The area behind the absorbent core 40a does not deform together with the absorber, and therefore it is difficult to directly transmit the deformation of the absorber. By absorbing the deformation from the side of the absorbent core 40a by the second region R2, it is possible to effectively suppress the deformation of the absorbent core 40a from being transmitted to the third region R3.

The sheet material that is joined to the waist expansion and contraction part by the joining part preferably includes: a skin surface sheet (top sheet 50, side flaps 70, and back sheet 60a) located on the side facing the skin of the waist expansion and contraction portion, and a waist The non-skin surface sheet (exterior sheet 60) of the non-skin facing side of the expansion and contraction part. The skin sheet, waist stretchable part, and non-skin face sheet are joined through the joint. It can suppress the wrinkles caused by the formation of the junction row on both the skin sheet and the non-skin sheet, causing the skin sheet to float on the rear edge of the diaper or the non-skin sheet to float on the rear edge of the diaper . In addition, by having a skin face sheet, the skin touch of the face in contact with the skin of infants can be improved.

The first region R1 is preferably arranged in a region extending from the leg expansion and contraction portion in the longitudinal direction. When manufacturing disposable diapers, the elastic members constituting the leg stretch parts are continuously stretched in the longitudinal direction of the product, and the stretched elastic members are joined to the fiber web (back sheet, exterior sheet) Etc.) After manufacturing a continuous body of disposable disposable diapers in the longitudinal direction, the continuous body is cut along the width direction of the product according to the length of each product. According to this manufacturing method, by cutting the continuum, the stretched elastic member is contracted in the longitudinal direction of the product, leaving only the part joined near the opening of the leg circumference. In this manufacturing method, in the region extending in the longitudinal direction from the leg expansion and contraction portion, the leg expansion and contraction portion is arranged during manufacture, but the leg expansion and contraction portion is not arranged in the product state, and the fiber webs holding the leg expansion and contraction portion are not joined to each other .

Since the highly stretchable first region R1 (because it does not have a joint) is arranged in the region extending in the longitudinal direction from the leg stretchable portion, the region where the skin sheet and the non-skin sheet are not joined is attached to the body. It can suppress the leakage of the area or the overflow of SAP from the absorbent core.

The fifth region R5 and the fourth region R4 are preferably located on the inner side in the width direction than the outer edge of the absorbent core 40a. From the outer edge of the waist stretch portion 85 toward the width direction inner side, it is arranged: a first region R1 without a joint row, a third region R3 with a joint row, a fifth region R5 without a joint row, and a joint The fourth area R4 of the partial row. Since regions with high stretch rates and regions with low stretch rates are alternately arranged, it is possible to prevent the wearer from being too restrained and improve the fit.

In more detail, it can improve the fit when the disposable diaper is installed. When the disposable diaper is installed, the body of the wearer is placed on the back waist area of the disposable diaper in the unfolded state of the disposable diaper. At this time, the wearer’s body is placed to cover and absorb Full width of core 40a. The installer attaches the wearer's body to the full-width state of the absorbent core 40a, pulls the hook and loop straps and fixes it to the front waist area. At this time, the first region R1 located on the outer side in the width direction than the absorbent core 40a is pulled and stretched toward the outer side in the width direction. On the other hand, the fourth region R4 and the fifth region R5, which are located on the inner side in 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, and are subjected to the body pressure of the wearer. , So it hardly stretches in the width direction. The portion of the third region R3 on the widthwise inner side of the outer edge of the absorbent core 40a does not stretch, but the portion on the widthwise outer side of the outer edge of the absorbent core 40a is stretched. Therefore, when the disposable diaper is installed and the wearer is pulled up, a part of the first region R1 and the third region R3 stretches, and the other part of the third region R3 and the fourth region R4 and the fifth region R5 hardly stretch.

If the disposable paper diaper is installed and the wearer is pulled up, the body pressure applied to the absorbent core 40a decreases. Therefore, the other parts of the third region R3, the fourth region R4, and the fifth region R5 are easier to expand and contract than the state before the wearer is pulled up. At this time, since the first region R1 of the waist elasticity portion is already stretched, and the fourth region R4 stretches more easily than the fifth region R5, the fourth region R4 is stretched by the fifth region R5. As a result, the fourth region R4 of the waist stretch part in the state after the wearer is pulled up is fitted to the body of the wearer with a weak force. In addition, the third region R3 also fits the body of the wearer with weak force. Since the area with higher expansion rate and the area with lower expansion rate are provided, it can restrain the wearer from being too restrained and improve the fit.

The second region R2 is preferably arranged across the center in the width direction of the disposable paper diaper. The back bone is arranged in the center of the back of the wearer, and it is more ventral than the left and right parts. The depressed portion (Michael rhombus) is a depressed portion of the sacrum, and the second region R2 is arranged in the depressed portion. The part contracted by the second region R2 is arranged in the recessed part of the wearer. Therefore, it is possible to suppress the occurrence of a gap between the center of the wearer's back and the disposable diaper, and to more reliably prevent leakage from the recessed portion on the back side.

The area density of the junction part in the third region R3 is preferably higher than the area density of the junction part in 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 arranged denser than that of the fourth region R4. However, since the elongation rate of the waist stretchable part in the fourth zone is higher than that of the waist stretchable part in the third zone, the stretch rate of the waist stretchable part in the fourth zone R4 is higher than that of the waist stretchable part in the third zone R3. The rate becomes higher. The sacral part of the wearer is recessed and arranged at the part contracted by the fourth area. Therefore, it is possible to suppress the occurrence of a gap between the center of the wearer's back and the disposable diaper, and to reliably prevent leakage from the recessed portion on the back side.

(5) Modifications

Next, a disposable paper diaper related to a modified example will be explained based on FIG. 5.

Fig. 5 is a modified example of the placement of the rear edge of the disposable diaper 10A Large top view. In addition, in the disposable paper diaper of the modified example, the same reference numerals are used for the same configuration as the disposable paper diapers of the embodiment, and the description is omitted. The disposable paper diaper 10A of the modified example has a plurality of third regions R3 and a plurality of fifth regions R5. Therefore, the rear edge of the disposable diaper is arranged in order from the center in the width direction of the disposable diaper toward the outside: the fourth region R4 where the expansion ratio of the waist elastic portion 85 is low, the expansion ratio The high fifth region R5, the third region R3 with a low expansion ratio, the fifth region R5 with a high expansion ratio, the third region R3 with a low expansion ratio, and the first region R1 with a high expansion ratio.

With the disposable diaper of this modified example, it is also possible to form wrinkles extending in the longitudinal direction on the rear edge of the disposable diaper, thereby suppressing the floating of the rear edge of the disposable diaper. To maintain the fit of the back side. In addition, since the irregularities can be fitted to the body by the waist expansion and contraction portion, no gaps due to irregularities are formed, and leakage of the wearer's back side can be suppressed. In addition, the disposable paper diaper of the modified example is provided with the fifth region R5 on the extension line of the elastic member 81 of the leg-side stretchable portion 80 in the longitudinal direction. Since the joint is not arranged on the extension line extending from the elastic member 81 in the longitudinal direction, the elastic member 81 is not fixed by the joint at the time of manufacture, and can be arranged in a state where 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 it should not be considered that the statements and drawings constituting a part of this description limit the present inventors. Through this description, those who are familiar with this skill can understand various alternative implementation forms, examples, and application techniques. Therefore, based on the above description, the technical scope of the present invention is only based on the invention within the proper scope of patent application. It depends on specific matters.

In addition, the entire content of Japanese Patent Application No. 2015-250041 filed on December 22, 2015 is incorporated into this specification by reference.

〔Industrial availability〕

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

10‧‧‧Disposable diapers

20‧‧‧Front waist area

25‧‧‧Crotch area

30‧‧‧Rear waist area

35‧‧‧Leg opening

40‧‧‧Absorber

50‧‧‧Top sheet (thin sheet)

70‧‧‧Wing (thin sheet)

75‧‧‧Leg Extension

80‧‧‧Leg side telescopic part

81‧‧‧Elastic member

85‧‧‧Waist extension

90‧‧‧Hook and Loop

91‧‧‧Substrate sheet

92‧‧‧hook sheet

95‧‧‧Target Department

115‧‧‧The first gap

125‧‧‧The second gap

200‧‧‧Crotch stretch

L‧‧‧Length direction

W‧‧‧Width direction

Claims (7)

A disposable paper diaper having: a front waist area, a back waist area, and a sub-crotch area between the front waist area and the back waist area; the length direction from the front waist area to the back waist area , And the width direction orthogonal to the aforementioned length direction; a pair of hook and loop fasteners, extending along the aforementioned width direction in the aforementioned rear waist area, and fixed to the aforementioned front waist area; the absorbent core, straddling the aforementioned sub-crotch area towards the aforementioned front waist At least one of the area and the aforementioned back waist area extends; the waist stretch part is arranged at the rear edge of the disposable diaper and stretches in the aforementioned width direction; the sheet material is arranged overlapping the aforementioned waist stretch part, and by the first 1 The joining means and the second joining means are joined to the waist expansion and contraction part; and the joining part row is arranged at intervals along the length direction of the joining part by the second joining means; the joining part row is separated along the width direction The disposable paper diaper is arranged at intervals and has: a first area extending from both outer edges of the waist stretch part toward the inner side in the width direction, and is joined by the first joining means, and does not have The second joining means is the joining part; the second area extends from the front end edge of the waist expansion and contraction part toward the rear, is joined by the first joining means, and does not have the second joining And the third area, which is located on the inner side in the width direction than the first area and behind the second area, is joined by the first joining means, and has the joining section row, The first region is located on the outer side in the width direction than the absorbent core, and the waist stretchable portion is arranged on the non-skin facing surface side of the absorbent core. Such as the disposable paper diaper of claim 1, wherein the rear end edge of the joining section row is arranged on the rear end edge of the disposable paper diaper. The disposable paper diaper according to claim 1 or 2, wherein at least a part of the second area is arranged behind the absorbent core. The disposable paper diaper of claim 1 or 2, wherein the sheet material includes: a skin surface sheet located on the side of the skin facing side of the waist elastic part, and a non-skin facing surface of the waist elastic part Non-skin face sheet on the side. Such as the disposable paper diaper of claim 4, which has leg stretchable parts arranged around the legs of the wearer to stretch in the longitudinal direction, and at least a part of the first area is arranged stretched from the legs The area extending in the length direction. Such as the disposable paper diaper of claim 1 or 2, which has: a fourth area, located on the inner side in the width direction than the third area, from the center of the disposable paper diaper in the width direction Toward width It extends outward in the direction and is joined by the first joining means, and has the joining section row, and the fifth area, which is located between the third and fourth areas, is joined by the first joining means, and is not With the said joining part which the said 2nd joining means is said, the said 5th area|region and the said 4th area are located in the width direction inner side rather than the outer edge of the said absorbent core. For the disposable paper diaper of claim 1 or 2, wherein the second area is arranged across the center of the disposable paper diaper in the width direction.

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