JP3352389B2 - Disposable diapers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper.

[0002]

2. Description of the Related Art A disposable diaper disclosed in JP-A-62-250201 comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-absorbing core interposed between these two sheets. It has a pair of left and right leak-proof cuffs extending in the front and rear longitudinal direction and having a propensity to stand up from the inner surface of the diaper. This cuff is fixed to the inner surface of the diaper with both front and rear ends lying down inside the diaper.

[0003] The disposable diaper disclosed in Japanese Patent Application Laid-Open No. 63-190002 has a pair of left and right leak-proof cuffs extending in the front-rear longitudinal direction and having a propensity to stand up from the inner surface of the diaper.
The front and rear ends are fixed to the inner surface of the diaper while lying down on the outer side of the diaper.

In these known examples, a substantially liquid-impermeable nonwoven fabric made of hydrophobic fibers is preferably used for the leak-proof cuff. The nonwoven fabric can enhance the leak-proof function of the cuff.

[0005]

Problems to be Solved by the Invention
In the disposable diaper of Japanese Patent Publication No. 0201, although a pair of left and right leak-proof cuffs extending in parallel with the diaper front-rear direction have an advantage of forming an inward pocket by being inclined inward of the diaper, when they completely fall down, It covers the topsheet and the liquid-absorbent core located on the lower surface side of the topsheet. In the area covered with the leak-proof cuff, the core cannot directly absorb the body fluid through the topsheet, so the body fluid absorption rate of the diaper decreases, causing the body fluid to leak or giving the wearer discomfort. Cause that. When the topsheet is sweat-absorbing, if it is covered with a hydrophobic cuff, it will not be able to exhibit sweat-absorbing properties.

[0006] In the disposable diaper disclosed in Japanese Patent Application Laid-Open No. 63-190002, both ends of the leak-proof cuff fall down toward the outside of the diaper and are fixed, so that the cuff does not widely cover the core. On the other hand, since the cuff does not form an inward pocket, excrement tends to spread between the skin and the diaper in the crotch region. Also, the wet topsheet will come into contact with the skin over a large area. As a result, the wet feeling in the crotch region becomes relatively strong.

An object of the present invention is to provide a disposable diaper which has the advantages of these known diapers and can eliminate the disadvantages.

[0008]

In order to solve the above problems,
The present invention is based on the premise that a liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the longitudinal direction of the front and back is a front waist region, a rear waist region, and both. A crotch region located between the regions, a body having side flaps formed on both outer sides of the core, a base fixed to an upper surface of the side flap and extending in the front-rear direction around the crotch region, and the base And a substantially liquid-impervious leak-proof cuff, the free edge of which has a propensity to stand up from the upper surface.

Under this assumption, the present invention is characterized in that, in the leak-proof cuff, an intermediate portion between the base and the free edge in the crotch region is located above the core. On the upper surface, intermittently fixed in the longitudinal direction, the free edge falls down to the outside of the diaper in the front and rear waist region, and at least a part near the free edge is separated from the side flap and the side flap. Fixed to the upper surface of any of the wings of the diaper extending in the waist direction.

[0010] In one preferred embodiment of the present invention, the leak-proof cuff has an elastic elastic member attached in an extended state along an edge of the free edge, and a cuff is provided between the base and the free edge. A second elastic elastic member parallel to the elastic elastic member is attached in an extended state between the fixed portions intermittently fixed in the front-rear direction on the upper surface of the topsheet in the crotch region at an intermediate portion of the crotch region. Have been.

In another embodiment, the second elastic member has a higher elongation stress than the elastic member.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view of the diaper 1 in a state where elastic elastic members of respective parts are contracted.

FIG. 2 is a partially exploded plan view of the diaper 1 in a state where the elastic members of each part are extended, and shows a center line C
On the left side of −C, the leak-proof cuff 11 is detached from the main body 5 of the diaper 1.

In FIGS. 1 and 2, a diaper 1 includes a main body 5 including a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbent core 4 interposed between the sheets 2, 3.
And a leak-proof cuff 11 attached to the upper surface of both side edges of the main body 5. The main body 5 has a front waist region 6, a rear waist region 7, and a crotch region 8 located between the both regions 6, 7 in the front and rear longitudinal direction. 8, it curves inward, and is parallel in the front and rear waist regions 6 and 7.
Similarly, both side edges of the core 4 are curved inward in the crotch region 8 and narrow in width, and are wide in parallel in the front and rear waist circumferences 6 and 7, so that the entire core 4 has a so-called hourglass shape. The front and back sheets 2 and 3 extend from the periphery of the core 4 and are joined to each other by a hot-melt adhesive 30 (see FIG. 3) at the extending portion, and the flap-shaped side edges 12 and the front and rear flap-shaped ends Edges 13 and 14 are formed. The top sheet 2 has the same dimension in the front-rear direction as the back sheet 3, but has a smaller width dimension than the back sheet 3, so that the back sheet 3 extends outward from the side edge of the top sheet 2. (See FIG. 2). At an edge portion 14 of the rear waist region 7, an elastic elastic member 16 extending in the waist direction is located between the front and back sheets 2 and 3, and a hot melt adhesive (see FIG. (Not shown). In the side edge portion 12, the elastic elastic member 17 extending in the leg-circumferential direction is located between the back sheet 3 and the sheet 21 forming the leak-proof cuff 11, and at least one of the two sheets 3 and 21 is in an extended state. It is joined by. Tape fasteners 15 are attached to both side edges 12 of the rear waist region 7.

The leak-proof cuff 11 is made of a substantially liquid-impervious nonwoven sheet 21 that is long in the front and rear directions.
Are elastic in the width direction or in the width direction and in the front-back direction, and include an inner edge 22, an outer edge 23, and a front-rear edge 2.
4 and 26, and an elastic elastic member 27 is attached in an extended state at the center of the inner edge 22 in the front-rear direction. The sheet 21 includes an outer edge 23 and inner and outer edges 22,2.
Hot melt bonding to the upper surface of the portion 29A, 29B of the main body 5 at least on the lower surface of the portion 28A, 28B indicated by the plurality of small points between the middle portion 25 of FIG. They are joined via the agent 30. The sheet 21 is also located between the inner edge portion 22 and the intermediate portion 25 and is located on the upper surface of the core 4 on the lower surface of the first portion 31A and the second portion 31B that are separated from each other in the front-rear direction. The second third portion 32A and the fourth portion 32B are joined via a hot melt adhesive 30. In the sheet 21 joined to the main body 5 in this manner, the fifth and sixth portions 34A and 34B located near the front and rear ends of the inner edge 22 are bent outward of the main body 2, and the outer edge of the sheet 21 is bent. It is joined to the upper surface of the seventh and eighth portions 36A, 36B located at 23 via a hot melt adhesive 30. 5th and 6th sites 3
When joining 4A and 34B, the sheet 21 is extended in the width direction, and if necessary, in the width direction and the front-back direction.

FIGS. 3, 4 and 5 show the cut surfaces of the diaper 1 of FIG. 1 formed in this way along the lines III-III, IV-IV and VV. FIG. 3 is a cross section of a boundary area between the crotch area 8 and the rear waistline area 7. Cuff 1
1 includes a base 41 rising from the upper surface of the side edge 12 and a base 4
1 and a free edge 42 extending in the front-rear direction substantially in parallel with the first sheet 1. The elastic member 27 is located between the folded sheets 21 on the free edge 42. The free edge 42 is also the inner edge 22 of the sheet 21. The cuff 11
Top sheet 2 in which second portion 31B is located on the upper surface of core 4
, The separation distance between the left and right cuffs 11 is kept relatively small. The position of the third portion 32B is selected such that the free edge 42 of the cuff 11 is more likely to abut the perineum of the diaper wearer.

FIG. 4 is a cross-sectional view of the crotch region 8 in the central region in the front-rear direction. The cuff 11 has a first portion 31A and a second portion 31B.
And these two parts 31
In FIG. 4, which is a cross section between A and 31B, the free edge 42 of the cuff 11 is inclined more inward than the base 41. The excrement is absorbed after passing from the upper side to the lower side in the figure between the left and right free edges 42 having a relatively small separation dimension. When the diaper 1 is curved in the front-back direction with the topsheet 2 inside, the free edge portion 42 contracts the elastic member 27 and rises from the upper surface of the side flap 13 as illustrated.

FIG. 5 is a cross section of the rear waistline region 7. The cuff 11 is completely lying out of the diaper 1 and slightly covers the topsheet 2. Such front and rear waist area 6,
7 can absorb the excrement in a wide area without being disturbed by the cuff 11. Even when the diaper wearer is lying on the back and the excrement easily flows to the back side, the excrement can be quickly absorbed to stop the flow. When the topsheet 2 has a sweat-absorbing property, the topsheet 2 in the front and rear waist regions 6 and 7 can be used.
The diaper is widely exposed and exhibits a sweat-absorbing property, so that the feeling of wearing the diaper is improved.

FIGS. 6 and 7 are views similar to FIGS. 3 and 4 showing an embodiment of the invention. The leakproof cuff 11 in the illustrated diaper 1 includes an elastic member 27 near the top edge of the free edge portion 42 and an auxiliary elastic member 51 near the first portion 31A.
Having. The auxiliary elastic member 51 includes first and second portions 31A,
It extends in a stretched state between 31B and has a higher extension stress than the elastic members 27 which are parallel between the portions. When the diaper 1 is curved in the front-rear direction, the linear distance between the first and second portions 31A and 31B can be made shorter than that in FIG. 2 by the strong contraction force of the auxiliary elastic member 51.

In the diaper 1 configured as shown in FIGS. 6 and 7, the top edge of the free edge portion 42 of the leak-proof cuff 11 comes into contact with the diaper wearer's skin, and the gap between the diaper 1 and the skin is increased. The problem of excretion leaking can be solved. Further, the free edge portion 42 can be inclined inwardly of the diaper 1 to form an inward pocket. However, depending on how the diaper 1 is worn, the free edge portion 42 is inclined outwardly to form a pocket. It may not be possible. However, in the case of the illustrated leak-proof cuff 11, the auxiliary elastic member 51 is provided near the first and second portions 31A and 31B where the cuff 11 is fixed to the topsheet 2.
Extend in the front-rear direction, the range between the base 41 and the auxiliary elastic member 51 in the width direction of the leak prevention cuff 11 is:
It is always inwardly inclined, forming a pocket 52 as shown. Elastic member 51 with high elongation stress
Is to bend the high rigid core 4 in the front-rear direction,
2 has an effect of greatly opening. The pocket 52
The excrement floating on the upper surface of the topsheet 2 can be received and kept from touching the skin until it is absorbed by the core 4.

The extension stress of the auxiliary elastic member 51 is preferably 1.0 to 3 times that of the elastic member 21, and is preferably 1.2 to 3 times.
More preferably, it is 3.0 times. The member 51 may be a single member or a plurality of members.
1 is preferably 1.0 to 3.0 times the overall tensile stress of the member 21,
More preferably, it is 1.2 to 3 times.

In the diaper 1, the leak-preventing cuff 11 has extensibility, more preferably elastic elasticity, in the width direction or the width direction and the length direction of the cuff 11, and bodily fluid penetrates when the diaper 1 is used. A sheet 21 having liquid impermeability that can substantially prevent leakage to the outside is used. The sheet 21 includes, for example, a nonwoven fabric made of crimped conjugate fiber, a woven fabric or a nonwoven fabric using urethane or another elastic system,
There is a plastic sheet made of an elastomer. The sheet 21 may be subjected to a surface treatment, if necessary, to increase liquid impermeability. It is preferable to use a nonwoven fabric or a perforated plastic sheet for the top sheet 2 and a plastic sheet for the back sheet 3. The core 4 may be made of ground pulp or a mixture of ground pulp and a superabsorbent polymer. Each elastic member 16, 17
May be arranged in a plurality of rows as in the illustrated example, or may be arranged in a single row. The joining of the members of the diaper 1 can be performed by using a hot-melt adhesive, or by using a heat welding technique.

[0024]

According to the disposable diaper according to the present invention, the leak-proof cuff extending in the front-rear direction of the diaper is formed by inwardly inclining in the crotch region to form an inward pocket, and falling outward in the front-rear waist region. Since the topsheet and core are exposed in a wide area, it is possible to quickly absorb body fluid and sweat in a wide area around the front and back waist while preventing leakage in the inseam area. it can.

In the crotch region of the diaper, when the auxiliary elastic member is attached to the intermediate portion between the base and the free edge of the leak-proof cuff, it is ensured that the leak-proof cuff forms a pocket inward of the diaper.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a disposable diaper.

FIG. 2 is a partially exploded plan view of the diaper of FIG.

FIG. 3 is a view showing a cross section taken along line III-III of FIG. 1;

FIG. 4 is a view showing a section taken along line IV-IV of FIG. 1;

FIG. 5 is a view showing a section taken along line VV of FIG. 1;

FIG. 6 is a drawing similar to FIG. 3, showing an example of the embodiment;

FIG. 7 is a view similar to FIG. 4, but showing a diaper in the same mode as FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Core 5 Main body 6 Front waist area 7 Rear waist area 8 Inseam area 11 Leak prevention cuff 12 Side edge 27 Elastic elastic member 41 Base 42 Free edge 51 Second elastic elastic Member (auxiliary elastic member)

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61F 13/15-13/84 A61F 5/44

Claims (3)

(57) [Claims] 1. A liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and its longitudinal direction is located between the front waist region, the rear waist region, and these two regions. A main body having side flaps formed on both outer sides of the core; a base fixed to an upper surface of the side flap and extending in the longitudinal direction around the crotch region; and parallel to the base. A disposable diaper having an elastically stretchable free edge, said free edge having a substantially liquid-impervious leak-proof cuff having an upright propensity from said top surface, wherein said leak-proof cuff In the crotch region, an intermediate portion between the base portion and the free edge portion is intermittently fixed in the longitudinal direction to an upper surface of the topsheet located above the core, and the free edge portion is provided in the front and rear waist region. Part falls down to the outside of the diaper and the free edge It said diaper, characterized in that at least a portion of the near is fixed to one of the upper surface of the wing portion of the diaper extending from said side flap and the side flaps to the waist direction. 2. The leakproof cuff, wherein an elastic elastic member is attached in an extended state along an edge of the free edge, and a surface in the crotch region at an intermediate portion between the base and the free edge. 2. The elastic member according to claim 1, wherein a second elastic member extending in parallel with the elastic member is attached between fixed portions intermittently fixed to the upper surface of the seat in the front-rear direction. Diapers. 3. The diaper according to claim 2, wherein the second elastic member has a higher extension stress than the elastic member.