JP2000271167A - Absorptive article capable of preventing side leakage and excellent in fit feeling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the side leakage of excreta in an absorptive article, and improve wear feeling at the same time. SOLUTION: In the absorptive article provided with a long body having a long absorptive body between a liquid-permeable top sheet and a liquid- impermeable back sheet and solid gathers 7a, 7b in which a base end edge is fixed along the longitudinal direction on both sides in the longitudinal direction of the liquid-permeable top sheet surface, and a long elastic member is fitted in the longitudinal direction in an expanded condition, and both end parts are fixed to the liquid-permeable top sheet surface, a long elastic member 11 is fitted to tip edges 8a, 8b of the solid gathers straight in the longitudinal direction, and intermediate long elastic members 15a, 15b are fitted between the tip edge and the base end edges 12a, 12b non-straight in the longitudinal direction in an expanded condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable absorbent article, and more particularly to a disposable absorbent article capable of preventing side leakage and having a good feeling of wearing on a body.

[0002]

2. Description of the Related Art A disposable diaper, which is an example of a disposable absorbent article, is basically composed of a liquid-impermeable back sheet (1) and a liquid-permeable top sheet (2), as shown in FIGS. A long body having a long absorber (3) interposed therebetween and having a narrowed central portion in the longitudinal direction in a planar shape is provided. Further, one side of a mechanical fastener such as a fastening tape (4a) to (4d) using an adhesive or a Velcro fastener is attached to the outer surface of the liquid-impervious back sheet (1) which is on the back side when worn. A fastening tape provided with a member is provided, and left and right three-dimensional gathers (7a) (7a) (7a) which stand up along the longitudinal direction when worn on both longitudinal sides of the long body.
b) is provided.

The three-dimensional gathers (7a) and (7b) are made of, for example, a water-repellent non-woven fabric such as polyethylene, polypropylene, PET or the like having one side edge joined to the longitudinal side edges of the inner surface of the back sheet (1). The base sheet (12a) (12b), which extends the side sheets (10a) (10b) that become inward and along the longitudinal side edges
By continuously joining the top sheet (2) to the top sheet (2) by means such as heat sealing, a contraction force is applied in the longitudinal direction to the further extended inner side sheet portion and the leading edges (8a) (8b). The solid gather is formed by the fixed long elastic member (11), and the three-dimensional gathers have both ends (a1) to (a4) (hatched portions in the figure) in the longitudinal direction on the top sheet (2) surface. Due to the bonding, the disposable diaper appears upright when spread when used.

In addition, a leg gather along the longitudinal direction for forming leg gathers (5a) (5b) is formed at a joint portion of the central portion of the back sheet (1) with the side sheets (10a) (10b). The fastening tapes (4a) to (4d) engage with the outer surface of the liquid-impermeable back sheet (1) which is on the abdominal side when the elastic member (6) is sandwiched and further worn, not shown. A sheet made of polypropylene or the other engaging sheet of a mechanical fastener is fixed as a frontal tape.

[0005]

The purpose of the three-dimensional gather in such a disposable diaper is to prevent excrement from leaking sideways, and it is necessary to stand up when worn and bring it into close contact with the skin. In order to bring the solid gathers into good contact with the skin, it is necessary to increase the standing force of the solid gathers by increasing the contraction force of the long elastic member of the solid gathers, and as a result, to make strong contact with the skin of the crotch be able to. However, when the contraction force of the long elastic member is increased in this way, the irritation to the skin is also increased, which is a cause of impairing a comfortable wearing feeling. Conventionally, a disposable diaper in which a plurality of the same long elastic members are juxtaposed at the leading edge of the three-dimensional gather at a small interval is marketed, but there is a limit to achieving both the erectness and the feeling of wearing of the three-dimensional gather. was there. Further, in a disposable diaper using a wide and long elastic member, there is a disadvantage that air permeability is impaired.

[0006]

Accordingly, as a result of an examination in view of such a problem, the present invention has developed an absorbent article such as a disposable diaper which is less likely to leak laterally and has an excellent wearing feeling when worn.

That is, the absorbent article of the present invention comprises a long main body in which a long absorber is sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a longitudinal body of the liquid-permeable top sheet. Three-dimensional gathers having base edges fixed along both sides in the longitudinal direction along the longitudinal direction, and a long elastic member fixed in the longitudinal direction in an extended state and both ends fixed to the liquid-permeable topsheet surface. In the absorbent article, a long elastic member is fixed to the distal end edge of the three-dimensional gather in a straight line in the longitudinal direction and in an extended state, and further, an intermediate long elastic member is provided between the distal end edge and the base end edge. Are fixed in a stretched state in a non-linear manner in the longitudinal direction, and the contraction force between the fixed end edge long elastic member and the fixed intermediate long elastic member is fixed at this time. It is good to provide a difference in

Further, another absorbent article of the present invention comprises a long main body having a long absorbent body sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a surface of the liquid-permeable top sheet. Three-dimensional gathers whose base edges are fixed to both sides in the longitudinal direction along the longitudinal direction, and a long elastic member is fixed in an extended state in the longitudinal direction and both ends are fixed to the liquid-permeable top sheet surface. In the absorbent article provided with an elastic member, the elastic member is not provided at the distal end edge of the three-dimensional gather, and the intermediate elongated elastic member is non-linearly extended in the longitudinal direction between the distal end edge and the base edge. It is characterized by being fixed in a state.

According to the present invention, in any of the above absorbent articles, as the intermediate long elastic member, a plurality of long elastic members having different contraction forces, a plurality of long elastic members having the same contraction force, Alternatively, a plurality of long elastic members including a part of the same long elastic member having the same contraction force are provided, or as a plurality of intermediate portion long elastic members, the contraction forces are the same or different from each other, and the protruding ridge on the base end side is provided. It is effective to provide a curved lower convex elongated elastic member and a concave curved upper convex elongated elastic member on the base end side.

Further, according to the present invention, in any of the above-mentioned absorbent articles, the intermediate portion long elastic member is fixed in a convexly curved shape toward the base end, or the intermediate portion long elastic member is concavely curved toward the base end side. It is effective to fix to the shape or to fix the intermediate long elastic member in a wavy shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some types of absorbent articles obtained by the present invention will be described below with reference to the drawings using a disposable diaper as an example. In the drawings described below, an absorber and a long elastic body for leg gathers are omitted for easy understanding.

Type A (FIG. 3) This is a structure in which the left and right three-dimensional gathers (7a) and (7b) of the disposable diaper have respective base edges (12a) (12b) and respective front edges (8a) (8b). An intermediate long elastic member fixed between them has a shape curved concavely on the base end side and is attached in an extended state. That is, the elongated elastic members (15a) (15b), which are upwardly convex when the three-dimensional gathers (7a) and (7b) are raised, are fixed in an extended state.

Type B (FIG. 4) This is a type of three-dimensional gathers (7a) (7b) on the left and right sides of the disposable diaper, each having a base edge (12a) (12b) and a respective front edge (8a) (8b). An intermediate long elastic member fixed in between has a shape curved convexly toward the base end side and is attached in an extended state. That is, the downwardly convex elongated elastic members (16a) (16b), which are downwardly convex when the three-dimensional gathers (7a) and (7b) are raised, are fixed in an extended state.

Type C (FIG. 5) This is the type of three-dimensional gathers (7a) and (7b) on the left and right sides of the disposable diaper, each having a base edge (12a) (12b) and a respective front edge (8a) (8b). The intermediate portion long elastic member fixed between them is attached in a wavy and stretched state. That is, the corrugated long elastic members (17a) and (17b) were fixed in an extended state.

Further, in the case where non-linear intermediate portion long elastic members having various shapes are fixed as described above, the present invention includes a case where the long elastic member (11) at the leading edge is not provided.

Type D (FIG. 6) This is the shape of the left and right three-dimensional gathers (7a) and (7b) of the disposable diaper, with the respective base edges (12a) and (12b) and respective tip edges (8a) and (8b). The intermediate long elastic member fixed between them is fixed in an extended state having a larger contraction force than the long elastic member (11) fixed to the front end edge. The long ferroelastic members (18a) and (18b) having such a large contraction force have different materials from those of the long elastic members (11). Alternatively, it can be realized by a device in which the film is stretched more largely when it is fixed (that is, the stretching magnification is increased). -Type E This is another example of providing a difference in the contraction force of the intermediate portion long elastic member (not shown). The intermediate portion long elastic member has a contraction force smaller than that of the long elastic member (11). This uses a weak elastic member. Note that such a long strong elastic member or a long weak elastic member is about 1/10 to 4 / of the solid gather height (distance between the front edge and the base edge) with the long elastic member at the front edge.
Normally, it may be fixed linearly substantially in parallel with the long elastic member (11) of the front end edge at a distance of 5 mm.
It may be non-linear as in C).

Type F (FIG. 7) This is the shape of the left and right three-dimensional gathers (7a) (7b) of the disposable diaper with the respective base edges (12a) (12b) and the respective front edges (8a) (8b). As an intermediate long elastic member to be fixed therebetween, an upper convex long elastic member (15a) (15b) of FIG. 3 and a lower convex long elastic member (16a) (16b) of FIG. 4 are provided at the same time. It is. In this case as well, the long elastic member (11) at the leading edge may be omitted.

The disposable diaper according to the present invention as described above realizes both the improvement of the standing ability of the three-dimensional gather and the improvement of the wearing feeling. In other words, it is effective to prevent lateral leakage since the stimulation to the skin can be reduced and the contraction force can be set higher without impairing the air permeability of the three-dimensional gather portion. Furthermore, if the intermediate long elastic member to be fixed is non-linear, adjust the shape and size of the non-linear shape and the contraction force to balance the two effects of preventing lateral leakage and improving the feeling of wearing. Gather design becomes possible. Further, in the above example, the joining surfaces of both ends (a1 to a4 in FIG. 1) of the three-dimensional gather with the surface of the liquid-permeable top sheet (2) are both of the three-dimensional gather (7
a) Although the inner surfaces facing each other of (7b) are opposite to each other, in the present invention, the outer surfaces opposite to each other may be the joining surfaces with the top sheet (2) surface.

When a plurality of long elastic members are attached as in the present invention, the plurality of long elastic members follow the wearer's movement flexibly, so that the three-dimensional gather becomes difficult to bend and the horizontal gathering becomes difficult. Leakage can be effectively prevented. By using a plurality of long elastic members, as shown in FIG. 8, a large number of folds are formed between the front edge long elastic member (11) and the intermediate long elastic member (20), so that three-dimensional gathers hit the skin. The cushioning property of is improved. In particular, when a difference is provided in the contraction force between the distal edge long elastic member and the middle portion long elastic member, the standing state of the three-dimensional gathers when worn becomes concavely curved inward as shown in FIG. 9, The storage of excrement is also improved. Furthermore, in the case where the front edge long elastic member is not provided, there is no elastic member at the front edge of the non-woven fabric constituting the three-dimensional gather which is in strong contact with the skin, so that the contact with the skin is softer and the wearing feeling is excellent. It will be.

[0020]

Next, the results of investigations on the degree of lateral leakage and the feeling of wearing in the disposable diaper according to the present invention and the conventional disposable diaper are shown in Table 1 below. Examples of the present invention in the table are disposable diapers of the types A, B, D, E and F described above, all of which are provided with a long elastic member (11) at the leading edge of a three-dimensional gather. A conventional one having a long distal end elastic member (11) and a conventional one in which two long elastic members are closely arranged are used. The height of each of the three-dimensional gathers of the disposable diapers, that is, the distance from the base edge to the tip edge was 40 mm, and urethane rubber part number 840d was used as the fixed long elastic member.

The "shape (X / Y)" of the long elastic member in the table indicates that the fixed shape of the front edge long elastic member is X, and the fixed shape of the intermediate long elastic member is Y, and the shape is three-dimensional gather. It is the figure which showed the shape of the long elastic member which was fixed simply. Similarly, the “spacing (L)” indicates the spacing between the distal-end long elastic member and the middle elongated elastic member, and each type of the present invention is indicated by L in the figure. Further, the extension ratio in the table refers to a value of (length when the elastic member is extended / length when the elastic member is free), and “A / B” indicates the extension ratio of the distal end long elastic member as A and intermediate. The expansion magnification of the long elastic member is shown as B.

[0022]

[Table 1]

As can be seen from Table 1, all of the disposable diapers of Examples 1 to 5 of the present invention have improved wearing feeling as compared with Comparative Example 1 which is a conventional general disposable diaper. In particular, in Example 2 of the present invention of Type B in which a convex intermediate elastic member having a convex shape is fixed downward, and in Example 4 of the present invention of Type D having a small extension ratio of the distal-end elongated elastic member, the effect of improving the feeling of wearing is improved. large. Example 2 of the present invention
In the paper diaper, the three-dimensional gathered wall surface protruded outward at the crotch portion, so that it was recognized that the cushioning property increased when the skin hit the skin. On the other hand, in the comparative example 2 in which two long elastic members having the same characteristics were installed close to each other, the improvement in the wearing feeling was slight.

Also, in Example 1 of the present invention of type A in which an intermediate elongated elastic member having a convex shape is fixed, and in Example 3 of the present invention of type E in which the extension elasticity of the elongated elastic member at the leading edge is increased, The leak resistance was greatly improved due to the improved close contact property. Further, in Example 5 of the present invention of Type F in which Type A and Type B were combined, a further improvement in both the leakage resistance and the feeling of wearing was recognized. From these results, it is expected that even if the contraction force of the long elastic body is further increased, the good wearing feeling is not impaired.

[0025]

As described above, according to the present invention, it is possible to effectively prevent lateral leakage of excrement, and at the same time, to improve the feeling of wearing an absorbent article such as a disposable diaper. The feeling of use for was improved.

[Brief description of the drawings]

1A and 1B show a conventional disposable diaper, wherein FIG. 1A is a plan view and FIG. 1B is a sectional view taken along line AA ′ of FIG.

FIG. 2 is a perspective view showing a conventional paper diaper.

FIG. 3 is a plan view showing an example of a disposable diaper according to the present invention.

FIG. 4 is a plan view showing another example.

FIG. 5 is a plan view showing another example.

FIG. 6 is a plan view showing another example.

FIG. 7 is a plan view showing another example.

FIG. 8 is a perspective view of an essential part for explaining the effect of the three-dimensional gather in the present invention.

FIG. 9 is a sectional view of an essential part of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-impermeable backsheet 2 Liquid-permeable topsheet 3 Long absorber 4a-4d Fastening tape 5a, 5b Leg gather 6 Elastic member for leg gather 7a, 7b Solid gather 8a, 8b Front edge 10a, 10b Side sheet 11 Long elastic members 12a, 12b Base edge 15a, 15b Upper convex long elastic members 16a, 16b Lower convex long elastic members 17a, 17b Corrugated long elastic members 18a, 18b Long strong elastic members 20 Middle long Elastic member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroaki Matsubara 6-22-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Crecia Co., Ltd. (reference) 3B029 BD12 BD13 BD14 BF07 4C098 AA09 CC10 CC12 CE07

Claims (8)

[Claims] 1. A long main body having a long absorbent body sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a longitudinal direction on both sides of the liquid-permeable top sheet surface in the longitudinal direction. A three-dimensional gather whose base edge is fixed along, and a long elastic member is fixed in an elongated state in a longitudinal direction and both ends are fixed to the liquid-permeable top sheet surface. A long elastic member is fixed to the distal end edge of the three-dimensional gather in a straight line in the longitudinal direction and in an extended state, and an intermediate long elastic member is non-linear in the longitudinal direction between the distal end edge and the base end edge. An absorbent article which prevents lateral leakage and is excellent in a feeling of wearing, characterized by being fixed in an extended state. 2. The absorbent according to claim 1, wherein a difference is provided in the contraction force between the fixed end edge long elastic member and the fixed middle intermediate long elastic member. Goods. 3. A long body in which a long absorber is sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a longitudinal direction on both sides of the liquid-permeable top sheet surface in the longitudinal direction. A three-dimensional gather whose base edge is fixed along, and a long elastic member is fixed in an elongated state in a longitudinal direction and both ends are fixed to the liquid-permeable top sheet surface. An elastic member is not provided at a distal edge of the three-dimensional gather, and an intermediate long elastic member is fixed in an extended state in a non-linear shape in a longitudinal direction between the distal edge and the proximal edge. Absorbent articles that prevent side leakage and have excellent fit. 4. The intermediate long elastic member includes a plurality of long elastic members having different contraction forces, a plurality of long elastic members having the same contraction force, or a long elastic member having the same contraction force. A plurality of elongate elastic members are provided.
4. The absorbent article according to any one of the above items 3, which prevents lateral leakage and has an excellent wearing feeling. 5. A plurality of intermediate long elastic members having the same or different contraction forces, and a lower convex long elastic member convexly curved toward the base end and an upper convex length concavely curved toward the base end. 5. The absorbent article according to claim 4, wherein said absorbent article has a lengthy elastic member and prevents lateral leakage and has an excellent wearing feeling. 6. The absorbent article according to any one of claims 1 to 3, wherein the intermediate long elastic member is fixed to the base end side in a convexly curved shape. 7. The absorbent article according to claim 1, wherein the intermediate long elastic member is fixed in a concavely curved shape on the base end side. 8. The absorbent article according to any one of claims 1 to 3, wherein the long elastic member at the intermediate portion is fixed in a corrugated shape.