KR102469156B1 - disposable diapers - Google Patents

Abstract

In the disposable diaper 10, when viewed from the plane of the disposable diaper 10, the center line O of the pair of fastening tapes 90 in the longitudinal direction L overlaps the waist-circumferential elastic part 85, It is configured so as not to overlap with the absorber 40, and the length W1 of the waist elastic part 85 in the width direction W is longer than the length W2 of the absorber 40 in the width direction W. structured, and the elongation rate of the region A located outside the absorber 40 in the width direction W in the waist elastic portion 85 is higher than that of the absorbent body 40 in the waist elastic portion 85. It is configured to be different from the elongation rate of the region B located inside the width direction W.

Description

disposable diapers

The present invention relates to disposable diapers.

[0002] Conventionally, in a tape type disposable diaper, there is known a technique of providing a waist-contactable portion that expands and contracts in the width direction around the wearer's waist in order to maintain a good fit around the wearer's waist.

Patent Document 1: Japanese Patent Laid-Open No. 10-225481

However, in the conventional disposable diaper described above, the rigidity of the absorber hinders the expansion and contraction of the waist elastic part, so that the disposable diaper cannot be reliably fitted around the wearer's waist, and excretion leaks from the wearer's back. There was a problem that it caused and discarded.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a tape-type disposable diaper capable of improving fit around the wearer's waist.

A first feature of the present invention is a front waist region, a rear waist region, and a crotch region positioned between the front waist region and the rear waist region, and the rear waist region is separated from the front waist region. a pair of fastening tapes having a longitudinal direction toward the region and a width direction orthogonal to the longitudinal direction, extending along the width direction in the rear waist region and fixed to the front waist region; A disposable diaper having an absorbent body extending across regions toward at least one of the front waist region and the rear waist region, and a waist elastic portion disposed between the pair of fastening tapes and stretched in the width direction, When viewed from a plan view of the disposable diaper, a central line of the pair of fastening tapes in the longitudinal direction overlaps the waist elastic portion and is configured not to overlap the absorber, and the width direction of the waist elastic portion overlaps with the absorbent body. The length is configured to be longer than the length of the absorber in the width direction, and the elongation rate of a region located outside the absorber in the width direction in the waist elastic portion is the absorbent body in the waist elastic portion. It is a summary that it is comprised so that it may differ from the elongation rate of the area|region located inside the said width direction.

1 is an exploded plan view of a disposable diaper according to the present embodiment.
Fig. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in Fig. 1;
Fig. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in Fig. 1;
Fig. 4 is a diagram schematically showing how the wearer wears the disposable diaper according to the present embodiment. Fig. 4(a) shows a state where the fastening tape is fixed to the front waist region and the wearer is lying down, and Fig. 4(b) shows a state where the fastening tape is fixed to the front waist region and the wearer is standing. to be.

Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. In addition, in description of the following drawings, the same or similar code|symbol is attached|subjected to the same or similar part. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one.

Accordingly, specific dimensions and the like should be determined in consideration of the following description. Further, even between the drawings, portions having different dimensional relationships or ratios may be included.

(1) Overall schematic configuration of disposable diapers

1 is an exploded plan view of a disposable diaper 10 according to this embodiment. Fig. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in Fig. 1; Fig. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in Fig. 1; 1 shows the elastic members of the leg elastic members 75 and the leg side elastic members 80 until wrinkles are not formed on the top sheet 50 and side flaps 70 constituting the disposable diaper. It is a drawing of the expanded state.

As shown in FIG. 1 , the disposable diaper 10 has a front waist region 20 , a crotch region 25 , and a rear waist region 30 . The front waist region 20 is a portion in contact with the wearer's front waist portion (belly portion). Further, the rear waist region 30 is a portion in contact with the wearer's rear waist region (back). The crotch region 25 is located between the front waist region 20 and the rear waist region 30 .

In addition, a pair of leg openings 35 are formed in the disposable diaper 10 . The leg openings 35 are provided at the outer edges (outer ends in the width direction W) of the disposable diaper 10, along the circumference of the wearer's legs while the disposable diaper 10 is worn on the wearer. part to be placed.

In the present embodiment, in the disposable diaper 10, the direction from the front waist region 20 to the rear waist region 30 is called the longitudinal direction L, and is perpendicular to the longitudinal direction L. The direction is referred to as the width direction (W).

A disposable diaper (10) has an absorber (40). The absorbent body 40 has an absorbent core 40a and a core wrap 40b. The absorbent core 40a extends over the crotch region 25 and from the crotch region 25 toward at least one of the front waist region 20 and the rear waist region 30 .

The absorbent core 40a is the same as a conventional disposable diaper, and can be configured appropriately using a known member or material such as pulverized pulp or a superabsorbent polymer. The absorbent core 40a is surrounded by a sheet-shaped core wrap 40b. The core wrap 40b is a sheet covering the absorbent core 40a. The rear edge of the absorbent core 40a and the rear edge of the core wrap 40b substantially coincide. More specifically, the distance between the rear edge of the absorbent core 40a and the rear edge of the core wrap 40b is 5 mm or less.

In the absorbent core 40a, a low unit weight region 110 having a lower weight of the absorbent material than other portions of the absorbent core 40a is formed. The low unit weight region 110 is located at the center of the rear edge of the absorbent core 40a in the width direction W. The width of the low unit weight region 110 in the width direction W is widened toward the rear edge of the absorbent core 40a. More specifically, the low unit weight region 110 has a wedge shape in a plan view of the disposable diaper 10 .

As shown in FIGS. 2 and 3 , a liquid permeable top sheet 50 is provided on the surface side (skin facing side) of the absorber 40 . Further, a liquid impervious back sheet 60a is provided on the back surface 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.

As shown in FIG. 1 and FIG. 2, the outer edge of the absorber 40 is equipped with the side flap 70, respectively. The side flaps 70 span the front waist region 20, the crotch region 25, and the rear waist region 30, and are disposed outside the absorber 40 in the width direction W.

The side flaps 70 are made of one or two or more overlapping nonwoven fabrics. As shown in Fig. 2, the side flaps 70 are located closer to the skin facing surface than the absorbent core 40a, and extend outward from the absorbent core 40a in the width direction W.

As shown in Fig. 2, the inner edge of the side flap 70 (the inner edge in the width direction W) covers the absorbent core 40a, and the outer edge of the side flap 70 covers the absorbent core 40a. It is arrange|positioned on the outer side of the width direction W more.

As shown in FIG. 1 , the side flaps 70 are provided with a pair of leg extensions and contractions 75 disposed inside the leg openings 35 in the width direction W and capable of extending and contracting in the longitudinal direction L. . The leg expansion and contraction part 75 should just be configured so that the leg opening 35 can expand and contract in the longitudinal direction L, and may be arrange|positioned along the leg opening 35, and a part may be relative to the leg opening 35. It may be arranged in an inclined state.

Here, as shown in FIG. 1 , the pair of leg elastic parts 75 may be configured so as to spread outward in the width direction W toward the rear waist region 30 .

Further, as shown in FIG. 1 , a pair of leg side elastic parts 80 extending along the longitudinal direction L are provided inside the width direction W of the pair of leg elastic parts 75 . The leg side elastic part 80 is provided at the inner end of the side flap 70 in the width direction W, and is an upright elastic gather.

In addition, the disposable diaper 10 includes a crotch stretchable portion 200 disposed in a region overlapping the absorbent body 40 in the crotch region 25 . The crotch stretchable portion 200 is configured so that a part of the crotch region 25 can maintain a flatter shape than other portions of the absorber 40 when the disposable diaper 10 is worn. The crotch expansion and contraction unit 200 is configured to be capable of expansion and contraction in at least the longitudinal direction (L) or the width direction (W).

As shown in Fig. 1, a first notch 115 and a second notch 125 are formed in the absorbent core 40a in the crotch region. The first notch 115 and the second notch 125 are slits formed in the absorber 40 . A slit is a part where an absorbent material does not exist. The first notch 115 and the second notch 125 each have a notch shape extending from the outer edge of the absorbent core 40a toward the inner side in the width direction W.

In addition, the disposable diaper 10 need not have the crotch elastic part 200, the 1st notch 115, and the 2nd notch 125.

The fastening tapes 90, as a pair, extend along the width direction W in the rear waist region 30 and are fixed to the non-skin facing surface of the front waist region 20 to form a disposable diaper ( 10) to the wearer's body.

The fastening tape 90 is attached to the area of the side flap 70 corresponding to the rear waist area 30 . Each of the fastening tapes 90 is provided with a base sheet 91 connected to the side flap 70, and engaging hooks (not shown) as a plurality of engaging members, and a hook sheet fixed to the base sheet 91 (92) is provided. The hook seat 92 is a region provided with an engaging member.

Here, as shown in FIG. 1 , the absorber 40 (or the absorbent core 40a) is located on the inner side of the hook sheet 92 in the longitudinal direction L of the inner end 92E1 in the longitudinal direction L. may be placed in

The target portion 95 is provided on the non-skin facing side of the exterior sheet 60 in the front waist region 20 . The target portion 95 is configured to be engaged with the fastening hook of the fastening tape 90, and functions as a loop of the hook and loop engaging system.

As the target portion 95, an air-through nonwoven fabric can be used, for example. In addition, the disposable diaper 10 may not have the target portion 95 and may be configured so that the fastening tape 90 is fixed to the exterior sheet 60 in the front waist region 20 .

Moreover, as shown in FIG. 1 and FIG. 2, between the pair of fastening tapes 90 in the width direction W, the waist elastic part 85 which can be stretched in the width direction W is provided. The waist elastic part 85 is configured to contract between the fastening tapes 90 in the width direction W.

In this embodiment, the waist elastic part 85 is constituted by an elastic sheet. In addition, the waist-circumference elastic portion 85 is a portion that substantially expands and contracts in the width direction W, and the concept is to remove the portion where the elastic sheet is disposed in a state in which no stretch force is exerted. Therefore, the outer edge of the waist elastic portion 85 described later is not the outer edge of the elastic sheet, but the outer edge of the stretchable portion.

In the disposable diaper 10 according to the present embodiment, an elastic film having a basis weight of 20 to 45 g/m 2 is used as the elastic portion 85 around the waist. However, the waist elastic part 85 may be configured with a different configuration such as a plurality of lines of rubber thread. After the waist elastic portion 85 is stretched at a predetermined magnification to the length in a non-extended state (natural state), it is adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment.

The waist elastic portion 85 extends from the center of the disposable diaper 10 in the width direction W toward both outer sides in the width direction W, and is formed by continuous sheets extending in the width direction W. Consists of. The rear edge (outer end in the longitudinal direction L) 85E2 of the waist elastic portion 85 is located forward of the rear edge 10E2 of the disposable diaper 10 . Further, the rear edge 85E2 of the waist elastic portion 85 may coincide with the rear edge 10E2 of the disposable diaper 10 .

In addition, the front edge 85E1 of the waist elastic part 85 is ahead of the rear edge 40E2 of the absorbent body 40 (or the absorbent core 40a and core wrap 40b), and also the leg elastic part. It is located behind the trailing edge 75E2 of 75. Accordingly, in a plan view of the disposable diaper 10, at least a part of the elastic portion 85 around the waist is configured to overlap the absorbent body 40 (or the absorbent core 40a).

Here, the thickness of the absorber 40 in the region overlapping with the waist elastic portion 85 may be configured to be smaller than the thickness of the absorber 40 in other regions.

In addition, the waist circumference elastic part 85 spans the rear edge of the absorbent body 40 (or the absorbent core 40a and the core wrap 40b), and the absorbent body 40 (or the absorbent core 40a and the core The lap 40b] is configured to extend rearward from the rear edge.

The outer edge 85WO of the waist elastic portion 85 is located on the inner side in the width direction W of the inner edge of the fastening tape 90 (the inner end in the width direction W). The waist elastic part 85 and the fastening tape 90 are separated from each other in the width direction W.

As shown in FIG. 1 , the waist elastic portion 85 includes a first region 851 extending inward in the width direction W from both outer edges 85WO of the waist elastic portion 85; A second area 852 extending from the inner edge 851WI of the first area 851 toward the inside in the width direction W, and extending from the inner edge 852WI of the second area 852 in the width direction W. It has a third region 853 extending toward the inside of.

The first area 851, the second area 852, and the third area 853 are continuous in the width direction W. Therefore, non-stretch areas that do not expand or contract in the width direction W are not provided between the first area 851 and the second area 852 and between the second area 852 and the third area 853 . In addition, the inner edge 851WI of the first area 851 coincides with the outer edge 852WO of the second area 852, and the inner edge 852WI of the second area 852 corresponds to the third area ( 853) coincides with the outer edge 853WO.

The first region 851, the second region 852, and the third region 853 are configured to have different elongation rates in the width direction W. In detail, the elongation rate of the second region 852 in the width direction W is lower than the elongation rate of the first region 851 in the width direction W. In addition, the elongation rate of the third region 853 in the width direction (W) is higher than the elongation rate of the second region 852 in the width direction (W).

In addition, the relationship between the elongation rate of the first region 851 in the width direction W and the elongation rate of the third region 853 in the width direction W may be the same or higher. Preferably, the elongation rate of the third region 853 in the width direction (W) is higher than the elongation rate of the first region 851 in the width direction (W).

The outer edge 851WO of the first region 851 is located outside the outer edge of the absorbent core 40a in the width direction W. The inner edge 851WI of the first region 851 is located inward in the width direction W from the outer edge of the absorbent core 40a. Therefore, the first region 851 is disposed over the outer edge of the absorbent core 40a.

In addition, at least a part of the first region 851 may be located outside the absorbent core 40a in the width direction W, and the inner edge of the first region 851 is the outer edge of the absorbent core 40a. It may be located more outside in the width direction W, or the inner edge of the 1st area|region 851 may coincide with the outer edge of the absorbent core 40a.

The second region 852 is located between the first region 851 and the third region 853 . It is preferable that the second region 852 is arranged on the inner side in the width direction W of the outer edge of the absorbent core 40a.

The third area 853 is disposed over the center of the disposable diaper 10 in the width direction W. The third region 853 preferably overlaps at least a portion of the low unit weight region 110 when viewed from a plan view of the disposable diaper 10 .

Further, in the disposable diaper 10 according to the present embodiment, the waist circumferential elastic part 85 is a center line that passes through the center of the disposable diaper 10 in the width direction W and extends in the longitudinal direction L. may be symmetrical or asymmetrical with respect to

For example, both of the left and right first regions 851 may span the outer edge of the absorbent core 40a, or one first region 851 may span the outer edge of the absorbent core 40a. In addition, both of the left and right second regions 852 may be arranged inside the width direction W of the outer edge of the absorbent core 40a, and one second region 852 may be disposed inside the absorbent core 40a. ) may be arranged on the inner side in the width direction W from the outer edge of .

Further, in the disposable diaper 10 according to the present embodiment, a region having an elongation rate lower than that of the first region 851 may be provided outside the first region 851 in the width direction W.

As shown in FIG. 3, the waist elastic part 85 is located on the side of the non-skin facing surface rather than the absorbent core 40a. In this embodiment, the waist circumference elastic part 85 is arrange|positioned between the exterior sheet 60 and the back sheet 60a.

However, in the configuration in which the core wrap 40b extends outward from the absorbent core 40a in the longitudinal direction L, the waist elastic portion 85 is formed between the core wrap 40b and the back sheet 60a or You may arrange|position between the exterior sheets 60.

The position of the waist circumference elastic part 85 is not specifically limited. In addition, in the region where the absorber 40 is not disposed, as shown in FIG. 2 , the waist elastic portion 85 is provided between the side flap 70 and the back sheet 60a or the exterior sheet 60. may be placed.

As shown in FIG. 1 , in a plan view of the disposable diaper 10, the center line O of the pair of fastening tapes 90 in the longitudinal direction L overlaps the waist elastic part 85, and the absorbent body It is configured so as not to overlap with (40).

In addition, the length W1 of the width direction W of the waist elastic part 85 is the length W2 of the absorber 40 in the width direction W (or the width direction W of the absorbent core 40a). ) is configured to be longer than the length of ).

In addition, the elongation rate of the region A located outside the absorber 40 (or the absorbent core 40a) in the width direction W of the waist elastic portion 85 is the waist elastic portion 85 is configured so as to differ from the elongation of the region B located inside the width direction W from the absorber 40 (or the absorbent core 40a).

That is, as shown in FIG. 1 , the region A is located outside the virtual line VL1 in the width direction W, and the region B is located outside the virtual line VL1 in the width direction W. ) is located inside. Here, the imaginary line VL1 is the rear end of the disposable diaper 10 along the longitudinal direction L from the outer edge of the absorbent body 40 in the part of the absorbent body 40 having the longest length in the width direction W. It is a line extended to the edge 10E2.

For example, the elongation rate of the region A located outside the absorber 40 (or the absorbent core 40a) in the width direction W of the waist elastic portion 85 is the waist elastic portion 85 may be configured so as to be larger than the elongation rate of the region B located inside the absorber 40 (or the absorbent core 40a) in the width direction W, and the absorbent body in the waist elastic portion 85 (40) (or the absorbent core 40a) may be configured so as to be smaller than the elongation rate of the region B located inside in the width direction W.

Further, as shown in FIG. 1 , in a plan view of the disposable diaper 10 , the waist elastic portion 85 and the pair of leg elastic portions 75 may be configured so as not to overlap each other.

On the other hand, as shown in FIG. 1 , in a plan view of the disposable diaper 10, the waist elastic part 85 and the pair of leg side elastic parts 80 may be configured to overlap each other.

As shown in Fig. 1, the inner end (front edge) 85E1 of the waist elastic part 85 in the longitudinal direction L is the inner end of the hook sheet 92 in the longitudinal direction L. It may be arrange|positioned on the inner side of 92E1 in the longitudinal direction L.

As shown in FIG. 1 , the rear edge 85E2 of the waist elastic part 85 is outside the longitudinal direction L of the hook seat 92 from the outer end 92E2 in the longitudinal direction L. may be placed in

Further, in the disposable diaper 10 according to the present embodiment, the waist elastic portion 85 is configured to expand and contract in the width direction W, but the waist elastic portion 85 is configured to expand and contract in the width direction W and You may be comprised so that it may expand and contract in the longitudinal direction L.

In addition, the waist elastic part 85 and the absorber 40 are joined via an adhesive. The adhesive bonding the waist elastic part 85 and the absorber 40 is continuously arranged in a plurality of rows in the longitudinal direction (L), and each row is overlapped in the width direction (W).

Specifically, the adhesive has a structure in which a plurality of rows of spiral shapes continuous in the longitudinal direction (L) are arranged and the rows overlap in the width direction (W), and the adhesive is oscillated in the width direction (W) and the longitudinal direction ( For example, a configuration in which a plurality of rows of waveform images continuous in L) are arranged, and the rows overlap in the width direction W.

In the disposable diaper 10 according to the present embodiment, the waist elastic part 85 and the absorbent core 40a are not directly joined, but indirectly via the back sheet 60a and the core wrap 40b. are joined

An adhesive for bonding the waist elastic part 85 and the back sheet 60a, an adhesive for bonding the back sheet 60a and the core wrap 40b, and an adhesive for bonding the core wrap 40b and the absorbent core 40a , It is preferable that a plurality of rows are continuously arranged in the longitudinal direction (L), and each row is overlapped in the width direction (W).

"Elongation rate" in this specification means the degree of elongation, and shall be performed according to the following measuring method.

First, when the disposable diaper 10 is enclosed in a package or the like, the disposable diaper 10 is taken out of the package.

Second, a sample to be measured is prepared by cutting out the arrangement area of the elastic sheet constituting the waist-circumference elastic part 85. A state in which such a sample was left to stand for 24 hours in an atmosphere of 20°C ± 2°C and a relative humidity of 60% ± 5% RH is referred to as a "natural state".

Thirdly, in such a natural state, between the end (front end) of the elastic sheet on the side of the absorbent core 40a and the end (rear end) of the elastic sheet on the side of the waist opening, that is, at an intermediate position in the longitudinal direction (L). , dots (marks) are intermittently attached along the width direction (W). These points are based on the center of the elastic sheet in the width direction (W), and from this reference point to the ends of the sample in the width direction (W) of the elastic sheet at intervals of 5 mm on the left and right sides in the width direction (W) (marked ) is attached.

Fourth, the distance between adjacent points is measured. This distance is taken as the natural length (since the marks are attached at 5 mm intervals, it is 5 mm).

Fifth, the distance between the aforementioned marks when stretched from a natural state to a state where wrinkles by the elastic member cannot be seen with the naked eye on the elastic sheet is measured.

Sixth, the elongation rate is calculated by the formula of elongation rate (fold) of each site = (distance between marks in an extended state)/(distance between marks in a natural state).

(2) Manufacturing method of disposable diaper 10

Next, an example of a method for manufacturing the disposable diaper 10 according to the present embodiment will be described. In addition, for a method not described in this embodiment, an existing method can be used. In addition, the manufacturing method demonstrated below is an example, and can also manufacture with another manufacturing method. The manufacturing method of the disposable diaper 10 includes at least a component forming process, a component arranging process, a leg circumference forming process, and a cutting process.

In the component forming step, the component components constituting the disposable diaper 10 are formed. Specifically, for example, the absorber 40 is molded by laminating absorbent materials or the fastening tape 90 is formed.

In the component arrangement step, on the web constituting the back seat 60a, an elastic sheet constituting the waist elastic portion 85, another web such as a web constituting the top sheet 50, a leak prevention sheet, Components constituting the disposable diaper 10, such as the absorber 40 and the leg stretchable portion 75, are disposed.

Moreover, as a method of changing the elongation rate of the waist elastic part 85, the following method is mentioned, for example.

Before joining the waist elastic portion 85 to the back sheet 60a or the like, the waist elastic portion 85 is stretched in the width direction W by a gear.

When elongation is performed with such a gear, gear elongation in a region where the elongation rate is low (for example, the second region 852) is weakened. The gear elongation of the region where the elongation is increased (for example, the first region 851 or the third region 853) is strengthened. The intensity of gear elongation can be adjusted by changing the depth of the convex portion of the gear, the pitch of the convex portion of the gear, or the number of times of gear elongation. The elongation rate of the strongly stretched region is relatively high, and the elongation rate of the weakly stretched region is relatively low.

In the leg circumference forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut. This forms leg openings 35 arranged around the wearer's legs.

In the cutting step, the continuum on which the top sheet 50, the back sheet 60a, the absorbent body 40, etc. are arranged is cut into a single product size along the width direction W. In this way, the disposable diaper 10 is manufactured.

(3) action/effect

In the disposable diaper 10 according to the present embodiment, the length W1 of the waist elastic portion 85 in the width direction W is the width direction W of the absorber 40 (or the absorbent core 40a). ) is longer than the length W2 of the disposable diaper 10, and the center line O in the longitudinal direction L of the fastening tape 90, as viewed from the plane of the disposable diaper 10, is the waist-contactable portion 85 ) and overlapping with the absorbent body 40, when the disposable diaper 10 is attached, when the wearing assistant pulls the fastening tape 90, the rigidity of the absorbent body 40 Since the problem of obstructing the expansion and contraction of the waist elastic part 85 can be solved, the disposable diaper 10 can be reliably fitted around the wearer's waist.

Fig. 4 schematically shows how the disposable diaper 10 is attached to the wearer. 4(a) shows a state in which the fastening tape 90 is fixed to the front waist area 20 and the wearer is lying down, and FIG. 4(b) shows the fastening tape 90 attached to the front waist area. It is fixed at (20) and the wearer is standing up.

When attaching the tape-type disposable diaper 10 to the wearer, the wearing assistant puts the wearer's back on the back of the waist area 30 of the disposable diaper 10 and applies the fastening tape 90 in the width direction. By pulling outwardly of (W), the fastening tape 90 is fixed to the front waist region 20. As shown in (a) of FIG. 4 , in this case, the wearer's body pressure is applied to the back waist region 30 of the disposable diaper 10 .

In this case, the force generated when the wearing assistant pulls the fastening tape 90 outward in the width direction W is the absorbent body 40 (absorbent core 40a) in the waist elastic portion 85. Possibility of gaps between the wearer and the disposable diaper 10 when the wearer stands up after the disposable diaper 10 is attached because it does not reach the area B located inside the width direction W there is

Here, in the disposable diaper 10 according to the present embodiment, the region located outside the absorbent body 40 (or the absorbent core 40a) in the width direction W in the waist elastic portion 85 ( A case configured such that the elongation rate of A) is larger than the elongation rate of the region B located inside the absorber 40 (absorbent core 40a) in the width direction W in the waist elastic part 85. In , when the wearer stands up, the area B is stretched in the width direction W by the area A having a higher elongation rate than the area B, so that the wearer and the disposable diaper 10 The problem that there is a possibility that a gap may arise between them can be solved.

On the other hand, in the disposable diaper 10 according to the present embodiment, the area located outside the absorbent body 40 (or the absorbent core 40a) in the width direction W in the waist elastic portion 85 ( A case configured so that the elongation rate of A) is smaller than the elongation rate of the region B located inside the absorber 40 (absorbent core 40a) in the width direction W in the waist elastic part 85. In , when the disposable diaper 10 is worn on the wearer, even if the wearing assistant pulls the fastening tape 90 with a weak force, the stretch amount in the width direction W of the region A increases, so that the disposable diaper 10 is disposable. After wearing the diaper 10, when the wearer stands up, the area B is stretched in the width direction W by the area A and stretched, so that a gap is formed between the wearer and the disposable diaper 10. It is possible to solve problems that may occur.

In addition, since the waist circumferential elastic part 85 and the pair of leg elastic parts 75 are configured so as not to overlap each other in a plan view of the disposable diaper 10 according to the present embodiment, after the disposable diaper 10 is worn, , It is possible to avoid a situation in which the waist elastic part 85 is stretched inward in the longitudinal direction L following the movement of the wearer's leg and does not reliably fit the wearer's waist.

In addition, since the waist circumference elastic part 85 and the pair of leg side elastic parts 80 are configured to overlap each other in a plan view of the disposable diaper 10 according to the present embodiment, the disposable diaper 10 is formed around the waist. It is pulled up toward the stretchable portion 85, and a situation in which the wearer's body and the disposable diaper 10 are separated can be suppressed.

In addition, when viewed in a plan view of the disposable diaper 10 according to the present embodiment, the waist elastic portion 85 and the absorbent body 40 (or the absorbent core 40a) are configured to overlap, and the waist elastic portion ( 85) so that the thickness of the absorber 40 (or absorbent core 40a) in the overlapping region is smaller than the thickness of the absorber 40 (or absorbent core 40a) in other regions. Because of this structure, the absorbent body 40 (or the absorbent core 40a) is pressed by the waist elastic part 85, so that fit with the wearer can be improved.

Further, in the disposable diaper 10 according to the present embodiment, the absorber 40 (or the absorbent core 40a) is longer than the inner end 92E1 in the longitudinal direction L of the hook sheet 92 in the longitudinal direction. Since it is disposed inside L, the influence of the force generated when the fastening tape 90 is pulled outward in the width direction W can be more reliably reduced.

Further, in the disposable diaper 10 according to the present embodiment, the inner end (front edge) 85E1 of the waist elastic part 85 in the lengthwise direction L extends along the hook sheet 92 in the lengthwise direction L ) is disposed inside the longitudinal direction L of the inner end 92E1, and the outer end (rear end edge) 85E2 in the longitudinal direction L of the waist elastic portion 85 is a hook sheet ( Since it is disposed outside the longitudinal direction L of the outer end 92E2 of the longitudinal direction L of 92), the force generated when the fastening tape 90 is pulled outward in the width direction W It is possible to affect the waist elastic portion 85 efficiently, and the fit of the waist elastic portion 85 to the wearer can be improved.

Further, in the disposable diaper 10 according to the present embodiment, since the pair of leg elastic parts 75 are configured to extend outward in the width direction W toward the rear waist region 30, After the disposable diaper 10 is attached, the force that is stretched in the longitudinal direction (L) of the waist elastic portion 85 can be dispersed outward in the width direction (W).

Generally, the wearer's body is placed so as to cover the entire width of the absorbent core 40a when worn. Therefore, when the fastening tape 90 is tensioned, the portion positioned outside the wearer's body in the width direction W, that is, the region outside the absorbent core 40a in the width direction W is tensioned.

For example, if it is difficult to stretch the portion for tensioning the fastening tape 90, the attachment assistant cannot figure out how much the fastening tape 90 should be stretched, and may not be able to fix it in a correct position.

However, since the first region 851 having a relatively high elongation rate is disposed outside the absorbent core 40a in the width direction W, the attachment assistant stretches the first region 851 to form a fastening tape ( 90) is fixed. Since the first region 851 is easily stretchable, the wearing assistant can easily grasp the range in which the first region 851 can be extended. Therefore, the attachment assistant can grasp the range in which the fastening tape 90 extends, and can fix the fastening tape 90 to the correct position.

In addition, when fastening tape 90 is fixed, 1st area|region 851 is arrange|positioned at the position which touched the wearer's side waist bone. On the other hand, when the fastening tape 90 is fixed, the second area 852 and the third area 853 are in a state in which the body pressure of the wearer is applied and it is difficult to expand and contract.

However, after the disposable diaper 10 is attached to the wearer, for example, in a state where the wearer stands up, the body pressure applied to the rear waist region 30 of the disposable diaper 10 is reduced. When the wearer's body pressure applied to the rear waist region 30 is reduced, the first region 851, the second region 852, and the third region 853 interlock as shown in FIG. Thus, the second region 852 and the third region 853 each expand and contract with the first region 851 as a starting point.

Specifically, compared to the second area 852 and the third area 853, the first area 851 is already extended when the fastening tape 90 is attached. In this state, when the second region 852 and the third region 853 are each stretched and contracted, the second region 852, which has a relatively low elongation rate starting from the first region 851, moves toward the first region 851. The third region 853, which is stretched and has a relatively high elongation rate, stretches the second region 852 inward in the width direction W, so that the second region 852 is elongated.

At this time, since the first region 851 is located on the side of the fastening tape 90, it expands when the fastening tape 90 is fixed to the target portion 95. At this time, since there is a third region 853 that is more difficult to extend inward than the second region 852 in the width direction W, the third region 853 is located between the first region 851 and the third region 853. The second area 852 tends to stretch evenly in the width direction W, and as a result, the second area 852 can fit the baby's body evenly while not tightening the baby's body with a weak force.

By fitting the disposable diaper 10 to the wearer's body in this way, the first region 851 strongly fits the wearer's side waist bone. In addition, there are fewer lumbar vertebrae on the back side than the lumbar vertebrae on the side of the wearer, and the wearer's body is relatively soft. The second region 852 weakly fits such a part with few lumbar vertebrae. Since the wearer's body fits relatively hard parts and weakly fits the relatively soft parts of the wearer's body, it can fit the wearer's body without difficulty and improve the fit around the waist. That is, in order to "do not want to clamp the baby with a diaper" that the mother (helper) originally desires, and to prevent excretion from leaking without creating a gap between the disposable diaper 10 and the wearer's body, the fit property is improved. It is achieved by making it the structure of this invention that mutual antinomy that it is better (to strengthen tightening) is better.

The third area 853 is disposed over the center of the disposable diaper 10 in the width direction W. In the center of the wearer's back, the backbone is arranged, and it is recessed toward the dorsal side rather than the left and right parts. This umpan portion (Rhombus of Michaelis) is a depression of the sacrum portion, and the third region 853 is disposed in this umpan portion. In (a) of FIG. 4, this umpan region is indicated by "CR".

When the body pressure decreases after the disposable diaper 10 is worn, the third region 853 contracts while pulling the second region 852. This constricted portion can be placed by the wearer in the wompan area. Accordingly, it is possible to suppress the occurrence of a gap between the center of the wearer's back and the disposable diaper 10, and to fit the disposable diaper 10 around the entire waist.

In addition, since there is a difference in thickness of the absorbent core 40a between the front and back of the rear edge of the absorbent core 40a, a gap naturally tends to occur between the wearer's body and the disposable diaper 10. However, since the rear edge of the waist elastic portion 85 extends to the waist side beyond the rear edge of the absorbent core 40a, and the elongation rate of the third region 853 is relatively high, the dorsal side does not move from the fanned portion. leakage can be prevented more reliably.

Since the absorbent core 40a has a relatively higher rigidity than other members constituting the disposable diaper 10 (top sheet 50), it is difficult to be disposed along the wearer's body. However, since at least a part of the waist elastic portion 85 overlaps the absorbent core 40a and the waist elastic portion 85 is disposed on the side of the non-skin facing surface of the absorbent core 40a, the waist The absorbent core 40a can be fitted to the wearer's body by contraction of the stretchable portion 85 .

When the third region 853 is disposed in the entire area of the absorbent core 40a in the width direction (W), contraction of the third region 853 causes the width of the absorbent core 40a to be too short in a natural state. there is As a result, when fixing the fastening tape 90, the width of the disposable diaper 10 cannot be secured, making it difficult for the wearing assistant to grip the fastening tape 90, and there is a risk of deteriorating wearability.

However, since the second region 852 is located inside the absorbent core 40a in the width direction W from the outer edge thereof, the second region 852 and A third region 853 is disposed. Therefore, in a natural state, the width of the absorbent core 40a is not excessively shortened, and deterioration in wearability can be suppressed.

The inner edge of the first region 851 is located inward in the width direction W from the outer edge of the absorbent core 40a. When the fastening tape 90 is stretched and attached, the attaching assistant extends the first region 851 to fix the fastening tape 90. In addition, when the fastening tape 90 is fixed by extending the first region 851, the absorbent core 40a is disposed under the wearer's body, and body pressure is applied. Since the inner edge of the first region 851 is arranged on the inner side in the width direction W than the outer edge of the absorbent core 40a, the inner edge of the absorbent core 40a pulls the fastening tape 90. When worn, it is difficult to move under the wearer's body. Therefore, when the inner edge of the first region 851 is located inward in the width direction W from the outer edge of the absorbent core 40a, when the fastening tape 90 is pulled, the first region 851 The inner edge of becomes the starting point, and it becomes easy to extend the first region 851.

The adhesive for adhering the waist elastic portion 85 and the absorbent core 40a may be arranged in a plurality of rows continuously in the longitudinal direction (L), and each row may be overlapped in the width direction (W). According to this configuration, the waist elastic portion 85 and the absorbent core 40a can be bonded continuously in the longitudinal direction L and the width direction W, so that the waist elastic portion 85 is the absorbent core ( 40a) can prevent it from floating.

The extension rate of the third region 853 in the width direction W may be higher than that of the first region 851 in the width direction W. According to this configuration, since the elongation rate of the third region 853 is higher than that of the first region 851, the body pressure applied to the rear waist region 30 after the fastening tape 90 is fixed is reduced. In this state, the second region 852 is stretched toward the third region 853. Therefore, the contracted part by the third region 853 can be gathered in the depression of the wearer's back.

The third region 853 overlaps at least a portion of the low unit weight region 110 in a plan view of the disposable diaper 10 . According to this configuration, the low unit weight region 110 is contracted in the width direction W by the third region 853, so that the rear edge of the absorbent core 40a is deformed toward the center in the width direction W. Accordingly, the rear portion of the absorbent core 40a can be formed into a cup shape. With this cup-shaped absorbent core 40a, the wearer's buttocks can be covered, and the fit around the waist can be further improved.

The rear edge of the absorbent core 40a and the rear edge of the core wrap 40b substantially coincide with each other, and the waist elastic portion 85 has the rear edge of the absorbent core 40a and the rear edge of the core wrap 40b. It extends more posteriorly. For example, if the core wrap 40b extends rearward from the absorbent core 40a, there is a possibility that the elasticity of the waist elastic portion 85 may be inhibited by the core wrap 40b. However, since the waist elastic portion 85 extends rearward from the rear edge of the absorbent core 40a and the rear edge of the core wrap 40b, the rear edge of the absorbent core 40a and the core wrap 40b Behind the rear edge, the core wrap 40b or the like does not hinder the expansion and contraction of the waist elastic part 85.

In addition, the waist elastic part 85 is not disposed at the rear edge of the disposable diaper 10, and the side flaps 70 at the rear edge of the disposable diaper 10 have an inner side in the width direction W. And a umpan notch is formed in the longitudinal direction (L).

More specifically, the rear edge of the side flap 70 is recessed inward in the longitudinal direction L within a certain range extending inward in the width direction W from the outer edge of the side flap 70 . In other words, the outer edge of the side flap 70 is recessed inward in the width direction W within a certain range extending inward in the longitudinal direction L from the rear edge of the side flap 70 .

In this way, since the rear edge of the disposable diaper 10 is configured, peeling at the rear edge of the disposable diaper 10 can be suppressed, and the wearer's waist can be more reliably covered.

As described above, although the content of the present invention has been disclosed through the embodiments of the present invention, it should not be understood that the discussion and drawings forming a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operation techniques will become clear to those skilled in the art. Therefore, the technical scope of the present invention is to be determined only by the invention-specific matters according to the claims valid from the above description.

In addition, the entire content of Japanese Patent Application No. 2015-038605 dated February 27, 2015 based on the claim of priority of the present application is incorporated herein by reference.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can be folded in a stable position and miniaturized can be provided.

10... disposable diapers
20... anterior torso area
25... crotch area
30... back torso area
35... leg girth opening
40... absorber
40a... absorbent core
40b... cover sheet
50... top sheet
60... exterior sheet
60a... back seat
70... side flap
75... leg extension
80... leg side extension part
85... Elastic around the waist
851... Area 1
852... area 2
853... tertiary area
90... fastening tape
110... low unit weight area
115... 1st notch
125... 2nd notch
200... crotch stretch
L... longitudinal direction
W… width direction

Claims (8)

a front waist region, a rear waist region, and a crotch region positioned between the front waist region and the rear waist region;
having a longitudinal direction extending from the front waist region to the rear waist region and a width direction orthogonal to the longitudinal direction;
a pair of fastening tapes extending along the width direction in the rear waist region and fixed to the front waist region;
an absorbent body extending over the crotch region toward one or both of the front waist region and the rear waist region;
A disposable diaper disposed between the pair of fastening tapes and having a waist circumferential elastic part that stretches in the width direction,
When viewed from a plan view of the disposable diaper, a center line in the longitudinal direction of the pair of fastening tapes overlaps the waist-circumferential elastic portion and is configured not to overlap the absorbent body,
The length in the width direction of the waist elastic portion is configured to be longer than the length in the width direction of the absorber,
The elongation rate of the region located outside the absorber in the width direction in the waist elastic portion is different from the elongation rate of the region located inside the absorber in the width direction in the waist elastic portion. ,
In a plan view of the disposable diaper, the waist-circle elastic portion and the absorbent body are configured to overlap,
The disposable diaper according to claim 1 , wherein a thickness of the absorber in a region overlapping with the waist elastic portion is smaller than a thickness of the absorber in another region. According to claim 1,
The elongation rate of the region located outside the absorber in the width direction in the waist elastic portion is larger than the elongation rate of the region located inside the absorber in the width direction in the waist elastic portion. A disposable diaper, characterized in that. According to claim 1 or 2,
a pair of leg openings;
a pair of leg expansion and contraction portions disposed inside the pair of leg openings in the width direction and capable of stretching in the longitudinal direction;
The disposable diaper according to claim 1 , wherein, when viewed from a plan view of the disposable diaper, the elastic portion around the waist and the elastic portion of the pair of legs do not overlap. According to claim 3,
A pair of leg side elastic parts extending along the longitudinal direction inside the width direction of the pair of leg elastic parts,
The disposable diaper according to claim 1 , wherein, when viewed from a plan view of the disposable diaper, the elastic portion around the waist and the elastic portion on the side of the pair of legs overlap each other. According to claim 1 or 2,
It has side flaps extending outward in the width direction from the absorber,
Each of the pair of fastening tapes includes a base sheet connected to the side flaps, and a hook sheet provided with an engaging hook and fixed to the base sheet,
The disposable diaper according to claim 1, wherein the absorber is disposed on the inner side of the hook sheet in the longitudinal direction from the end of the hook sheet on the inner side in the longitudinal direction. According to claim 1 or 2,
It has side flaps extending outward in the width direction from the absorber,
Each of the pair of fastening tapes includes a base sheet connected to the side flaps, and a hook sheet provided with an engaging hook and fixed to the base sheet,
The inner end in the longitudinal direction of the waist elastic part is disposed on the inner side in the longitudinal direction than the inner end in the longitudinal direction of the hook sheet,
The disposable diaper according to claim 1, wherein an outer end in the longitudinal direction of the waist elastic part is disposed outside in the longitudinal direction than an outer end in the longitudinal direction of the hook sheet. According to claim 3,
The disposable diaper according to claim 1, wherein the pair of leg elastic parts are configured to widen outward in the width direction toward the rear waist region. According to claim 1 or 2,
The waist circumference elastic part,
a first region extending from both outer edges of the waist-circumferential elastic part toward an inner side in the width direction;
a second region extending from an inner edge of the first region toward an inner side in the width direction and having a lower elongation rate than the first region;
a third region extending from an inner edge of the second region toward the inside in the width direction and having a higher elongation rate than the second region;
A disposable diaper in which part or all of the first region is configured to be located outside the absorber in the width direction.

Images