JP2000300603A - Throw-away diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away diaper which prevents the leakage of excreta, is free of sweating and rashes and is comfortable to a wearing person. SOLUTION: This throw-away diaper has a liquid permeable front surface sheet 2, a liquid-impermeable rear surface sheet 3, an absorber 4 and side flaps. The side flaps are formed of a rear surface sheet and side sheets 5 and the rear surface sheets 3 of the side flap parts 5 are provided with holes of 25 to 90 μm at a ratio of 1 to 40 pieces/cm2. Further, the water pressure resistance of the side flaps is >=100 mmH2 and the air permeability is in a range of 1.0 to 350 cc/cm2.sec and the moisture vapor transmission rate 400 to 3000 g/m2.24 hr.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper commonly used as a diaper for infants and incontinent persons. More specifically, the present invention provides breathability and moisture permeability to improve swelling and rash. Further, the present invention relates to a disposable diaper having improved leakage by imparting water pressure.

[0002]

2. Description of the Related Art Conventionally, a disposable diaper is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between these two sheets, Techniques are known which comprise a side flap portion extending outwardly from a side edge location portion. Further, an elastic body is provided at a side flap portion to prevent leakage by increasing the adhesiveness to a thigh portion when a diaper is used. However, since an opaque plastic film is generally used as the liquid-impermeable back sheet, if the adhesiveness to the thigh is high, air permeability is impaired, and sweat and excrement of the wearer From moisture.

[0003] In order to reduce the discomfort of the wearer due to excrement such as discomfort to the wearer, a liquid-impermeable backing sheet made of a thermoplastic resin added with a filler and stretched to have a breathable and moisture-permeable film is used. It has been proposed to. However, in this case, since a film having a large number of fine holes has low strength, it is necessary to increase the basis weight to maintain the strength, and the cost increases accordingly. Further, it has been proposed to form the side flap portion with a breathable material, for example, a nonwoven fabric. However, when a nonwoven fabric is used, the cost is higher than that of a polyethylene film used as a normal back sheet, and the necessity of adhesion to the back sheet causes a decrease in operation efficiency.

Japanese Utility Model Publication No. 3-50896 discloses that a liquid-impermeable back sheet is arranged only in the vicinity of an absorber and its vicinity, and the back sheet is covered outside the back sheet to form a side flap. Disposable diapers on which a nonwoven fabric is disposed are disclosed. When such a nonwoven fabric is used, the cost is higher than that of a polyethylene film that is usually used as a back sheet, and the necessity of adhesion to the back sheet causes a decrease in operation efficiency. Furthermore, if the sheet holding the elastic body around the legs is thick, or if multiple layers are laminated, the elasticity will not be sufficiently exhibited, and the fit to the wearer will be insufficient, causing slippage during wearing. There were problems such as falling and excrement leaking.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disposable diaper that solves the above-mentioned problems of the conventional disposable diapers, prevents irregularities, rashes and leaks, and gives a comfortable feeling of wearing. Is to do.

[0006]

The present invention, which can achieve the above object, includes, for example, the inventions described below.

(1) A portion composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between these two sheets, and positions of both side edges in the width direction of the absorber. In a disposable diaper having a more outwardly extending side flap portion, the side flap portion comprises:
A liquid-impermeable back sheet and a side sheet made of a nonwoven fabric laminated on the upper surface thereof are formed, and the back sheet of the side flap portion is 25 to 900 μm.
m holes are provided at a rate of 1 to 40 holes / cm ² ,
Further, the side flap portion has a water pressure resistance of 100 mmH ₂ O or more measured according to JIS L1092,
The air permeability measured according to SL1096 is 1.0 to 3
JIS Z0208 at 50.0 cc / cm ² · sec
Is 400 to 3000 g / m ² measured according to
-A disposable diaper characterized by being 24 hours.

(2) J on the back sheet of the used diaper
The opacity measured according to the IS P8138A method is 5
The disposable diaper according to (1), which is not more than 0%.

(3) The back sheet of the side flap portion occupying the total area of the outer surface of the back sheet of the disposable diaper including the back sheet portion of the side flap portion and the other back sheet portion of the disposable diaper. (1) or wherein the area of
(2) The disposable diaper described in item (2).

(4) An elastic member around the leg is disposed between the side sheet forming the side flap portion and the back sheet, any one of the items (1) to (3). Use diapers described in the section. (5) The entire back sheet in the used diaper, wherein the back sheet portion of the side flap portion and the other back sheet portion in the used diaper are formed of a sheet integrally formed, The disposable diaper according to any one of (1) to (4).

(6) The entire back sheet of the used diaper is only provided on the back sheet portion of the side flap portion.
The disposable diaper according to item (5), wherein holes of 25 to 900 μm are provided at a rate of 1 to 40 holes / cm ² . (7) The entire back sheet of the used diaper has 1 to 40 holes of 25 to 900 μm in all the back sheet portions.
The disposable diaper according to (5), wherein the diaper is provided at a rate of cm ² .

(8) In the disposable diaper, three-dimensional gathers are provided along both side edges in the width direction of the absorbent body, the three-dimensional gathers rising near an end extending in the longitudinal direction of the absorbent body as a fixed base end. The disposable diaper according to any one of paragraphs (1) to (7), wherein the diaper is used. (9) The use according to (8), wherein the three-dimensional gathers are formed using the liquid-permeable surface sheet extending outward from both widthwise side surfaces of the absorber. Diapers.

(10) The three-dimensional gathers are formed by using the absorber-side end portion of the side sheet extending outward from both side surfaces in the width direction of the absorber, and extending to the absorber side. The disposable diaper according to item (8), wherein (11) The disposable diaper according to any one of (8) to (10), wherein the three-dimensional gather is liquid-impermeable.

(12) The three-dimensional gather is characterized in that it is liquid-impermeable, breathable, and moisture-permeable.
A disposable diaper according to any one of the above items (11). (13) The use according to any one of (8) to (12), wherein the three-dimensional gathers are formed so as to fall down to the absorber side or to fall down to the side flap side. Diapers.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
The back flap is made of a liquid-impermeable backing sheet
Formed from side sheets made of nonwoven fabric laminated on the surface
The back sheet of the side flap part is 25-
1 to 40 holes of 900 μm / cm ^TwoIt is set at the ratio of
And the side flaps are JIS L1092
Water resistance measured according to 100 mmH_TwoOver O,
The air permeability measured according to JIS L1096 is 1.0
~ 350.0cc / cm^Two・ Sec or more and JIS
 The moisture permeability measured according to Z0208 is 400 to 30
00g / m^Two・ It is in the range of 24 hours.

In the disposable diaper of the present invention having such a configuration, since the side flap portions have air permeability and moisture permeability while preventing leakage, the inside of the disposable diaper is prevented from becoming uneven and comfortable. Wearing feeling is given.

In the disposable diaper of the present invention, the opacity of the back sheet measured according to JIS P8138A is preferably 50% or less. By using such a back sheet, the excrement can be visually confirmed through the back sheet, that is, the so-called visibility is improved, and the diaper replacement is delayed and the wearer does not feel uncomfortable.

Further, the area of the back sheet of the side flap is 15 to 40% of the total area of the outer surface of the absorbent article obtained by adding the area of the back sheet of the side flap portion and the area of the back sheet under the absorber. Is preferred. By setting the air permeability and occupied area of the side flaps in this range, the diaper is more comfortable to wear, prevents stuffiness inside the diaper, and prevents exudates from seeping out from the side flaps. Can be obtained.

Further, the side flap portion on which the elastic member is disposed fits well around the wearer's leg, and since it has air permeability and moisture permeability, the inside of the diaper is prevented from becoming uneven, so that a comfortable wearing feeling can be obtained. Can be granted.

In the disposable diaper of the present invention, it is particularly important to control the water pressure resistance, air permeability and moisture permeability of the side flap portion. The water pressure resistance, air permeability, and moisture permeability mainly depend on the hole diameter of the liquid-impermeable back sheet, the ratio per unit area, the basis weight of the nonwoven fabric, the size of the interfiber voids, and the porosity. The larger the hole diameter of the back sheet and the larger the ratio per unit area, the higher the air permeability and moisture permeability. Conversely, the smaller the hole diameter of the back sheet and the smaller the ratio per unit area, the higher the water pressure resistance.

Further, the lower the weight of the nonwoven fabric, the larger the voids between fibers, and the higher the porosity, the higher the air permeability and moisture permeability. Conversely, the higher the basis weight, the smaller the voids between fibers, and the lower the porosity, the higher the water pressure resistance. The side flap portion having desired water pressure resistance, air permeability and moisture permeability can be achieved by appropriately selecting the nonwoven fabric used for the back sheet and the side flap.

When the side flaps have high air permeability and moisture permeability, the air and humidity inside and outside the diaper can freely enter and exit, and as a result, the increase in the humidity inside the diaper due to excretion and sweat is suppressed, and the wearer is comfortable. A comfortable wearing feeling. On the other hand, since the side flaps have high water pressure resistance, when the wearer excretes liquid excrement, the excrement does not catch up with the absorption rate of the absorber and overflows on the side flap. Does not seep through the side flaps.

In the disposable diaper of the present invention, the side flap portion is formed of a liquid-impermeable back sheet and a side sheet made of a nonwoven fabric laminated on the upper surface thereof. As the side sheet forming the side flap portion, a breathable nonwoven fabric made of synthetic fibers made of polyethylene, polypropylene, polyester, or other thermoplastic resin can be used. Examples of the method for producing the nonwoven fabric include a dry method, a wet method, a spunlace method, a card method, a spunbond method, a meltblown method, and a nonwoven fabric obtained by laminating a meltblown nonwoven fabric on one or both sides of a spunbond nonwoven fabric.

The back sheet forming the side flap portion is formed of a plastic film obtained by stretching a mixture of polyethylene, polypropylene, polyester, and other resins mixed with an inorganic filler and other components.

The back sheet of the present invention has a opacity of 50% or less as measured according to JIS P8138A by adjusting the mixing ratio of the resin and the degree of stretching. If the opacity is higher than 50%, the visibility of the excrement deteriorates, which is not preferable.

The backsheet of the side flap portion of the disposable diaper of the present invention is provided with holes of 25 to 900 μm at a rate of 1 to 40 holes / cm ² , more preferably 100 to 5 holes.
Holes of 00 μm are provided at a rate of ² to 20 holes / cm ² . Hot needle roll,
Holes are formed in a predetermined area in a dot shape, a staggered shape, or the like using a suction roll or the like, but there is no particular limitation. If the size of the hole in the back sheet is less than 25 μm, the inside of the diaper due to sweat or urine cannot be sufficiently prevented. On the other hand, if the size of the hole exceeds 900 μm, the excrement may exude from the side flaps, which is not preferable.
On the other hand, if the ratio of holes per unit area exceeds 40 holes / cm ² , the sheet does not have sufficient strength because the area constituting the sheet is small.

The side sheet and the back sheet of the side flap portion are joined by an adhesive such as a mist, a net, a dot, a spiral, or the like, or are bonded by thermal adhesion such as a net, a dot, etc. , So as not to impair moisture permeability.

The area of the back sheet of the side flap portion is 15 to 40% of the total area of the outer surface of the diaper, including the area of the back sheet of the side flap portion and the area of the other back sheet portion of the disposable diaper. It is preferably within the range. If the area of the side flap is less than 15%,
It cannot sufficiently prevent the inside of the diaper from being sweaty or urine. On the other hand, if the area of the side flaps exceeds 40%, the excrement may exude from the side flaps, which is not preferable.

In the disposable diaper of the present invention, the side flap portion preferably has a water pressure resistance of 100 mmH ₂ O or more, more preferably 200 mmH ₂ O, measured according to JIS L1092. If the water pressure is less than 100 mmH ₂ O, when the pressure is applied while the liquid excrement leaks onto the side flap, the liquid exudate oozes through the side flap.

In addition, JIS L1 of the side flap portion
No. 096, the air permeability is 1.0 to 350.
It is preferably in the range of 0 cc / cm ² · sec,
More preferably, it is in the range of 2.0 to 200.0 cc / cm ² · sec. Air permeability is 1.0cc / cm ² · s
If it is less than ec, it is not possible to sufficiently prevent stuffiness inside the diaper due to sweat or urine. On the other hand, the air permeability is 350 cc / cm ²
If the value is higher than c, the sheet does not have sufficient strength because the number of fibers constituting the sheet is small. In the case where the sheet is fixed with a binder or the like in order to increase the sheet strength, the sheet is hard, so that the fit is inferior.

Further, the moisture permeability measured according to JIS Z0208 is preferably in the range of 400 to 3000 g / m ² · 24 hr, and 440 to 2500 g / m ²
More preferably, it is in the range of 24 hours. If the moisture permeability is less than 400 g / m ² · 24 hr, it is difficult to rapidly reduce the humidity in the diaper that has increased due to excretion and perspiration, so that the wearer may feel uncomfortable due to stuffiness until the humidity in the diaper decreases. Would. On the other hand, the moisture permeability is 3000g
When the ratio exceeds / m ² · 24 hr, a high water pressure cannot be obtained because the size of the inter-fiber voids and the porosity in the entire nonwoven fabric increase.

In the disposable diaper of the present invention, a leg elastic member is disposed between the back sheet and the side sheet forming the side flap portion. As the leg elastic members, the elastic members used in ordinary disposable diapers, such as urethane and natural thread and flat rubber, can be used as they are. In this state, it is bonded and fixed to a predetermined area with a hot melt adhesive or the like, and it is possible to give a sufficient fit to a wearer.

In the disposable diaper of the present invention, a liquid-permeable sheet such as a non-woven fabric made of synthetic fiber made of polyethylene, polypropylene, polyester or other thermoplastic resin is used as the liquid-permeable surface sheet. be able to.

The absorbent used in the disposable diaper of the present invention has a liquid-retaining property composed of cotton-like pulp, high-absorbency polymer, synthetic fiber, hot-melt component, adhesive, hydrophilic sheet and the like. , But is not particularly limited. The shape of the absorber is not particularly limited, such as an hourglass, a rectangle, and a T-shape, and may be any shape that fits the inseam.
If necessary, the absorber may be compressed. The structure of the absorber may be, for example, a single layer mainly composed of cotton pulp. Further, a layer in which a highly absorbent polymer substance is uniformly mixed with flocculent pulp may be provided below this layer. Furthermore, a superabsorbent polymer substance may be sprayed in layers between these two layers. By doing so, a larger amount of urine can be absorbed and retained. As described above, the layer structure of the absorber of the present invention may be a plurality of layers as necessary.

Examples of the cotton-like pulp include chemical pulp, mechanical pulp, and pulp obtained by pulverizing a sheet of a chemical mechanical pulp with a crusher. As a pulp raw material, non-wood pulp such as hardwood wood pulp and hemp is also applied, not limited to softwood. The pulp raw material may be used alone or in combination of two or more, depending on the intended absorber. A synthetic fiber, a hot-melt component, an adhesive, etc. may be contained together with the cotton-like pulp, and 3 to 60% by weight of a hot-melt substance may be mixed and thermocompression-bonded. Examples of the hot melt component include polypropylene, polyethylene, polyester, polyvinylidene, acrylic resin, nylon resin and the like. Alternatively, a composite fiber composed of two or more components such as polyester, polypropylene, and polyethylene may be used.

Examples of the superabsorbent polymer include starch, cellulose, synthetic polymer, etc., which absorbs urine, body fluid and water at least 20 times its own weight, and is made of sodium polyacrylate. Is most preferred in terms of absorption performance. The superabsorbent polymer substance may be dispersed in a layer, or may be uniformly or non-uniformly distributed in the cotton-like pulp.

In addition, a layer may be used between the topsheet and the absorber to allow the excrement of the wearer to diffuse more quickly. As the diffusion layer, a liquid-permeable nonwoven fabric, woven fabric, porous plastic film, porous foam, reticulated foam, or the like made of polyester, polypropylene, or the like can be used. The production method and the shape are not particularly limited, but any material may be used as long as urine and excreta that have passed through the topsheet can be transferred to the absorber quickly and without leaving them.

The disposable diaper according to the present invention may have a three-dimensional gather that rises along both side edges in the width direction of the absorbent body, with the vicinity of the longitudinally extending end of the absorbent body as a fixed base end. The three-dimensional gathers can be formed using the liquid-permeable top sheet extending outward from both side surfaces in the width direction of the absorber. In addition, three-dimensional gather,
The absorber may be formed so as to extend toward the absorber by using the absorber-side end of the side sheet that extends outward from both side surfaces in the width direction of the absorber. The three-dimensional gathers are preferably liquid-impermeable, and are preferably air-permeable and moisture-permeable. The three-dimensional gathers can be formed either inwardly toward the absorber or outwardly toward the side flaps.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

FIG. 1 is a plan view of a disposable diaper according to the present invention. In FIG. 1, the disposable diaper 1 of the present invention
Liquid permeable top sheet 2 and liquid impermeable back sheet 3
And an absorber 4 and a side flap portion 5. The side flap portion 5 is formed from the back sheet 3 and the side sheet 8 made of a nonwoven fabric, and a leg elastic member 9 is disposed between the two sheets (see FIG. 2). Also, elastic members 1 are provided on both side edges of the topsheet 2.
0 are arranged, and a three-dimensional gather 11 is formed.

A cut-out portion 12 for forming a leg-around opening is formed in a region corresponding to the leg-around opening in the side flap portion 5. In a region corresponding to the waist opening, a waist elastic member 13 is arranged.
Further, a pair of fastening tapes 15 are arranged on the longitudinal side edge of the edge of the back body 14, and a reinforcing tape 17 is arranged in a central region near the edge of the front body 16. In addition, the back body 16 via the fastening tape 15
, A waist opening and a pair of leg openings are formed.

FIG. 2 is a cross-sectional view showing a state where the disposable diaper 1 of the present invention shown in FIG. 1 is cut along a line XX ′ perpendicular to the longitudinal direction. In FIG. 2, the disposable diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 disposed between these two sheets.
And a side flap portion 5 extending outward from a side edge of the absorber. In this case, the side sheet 8 is disposed up to the vicinity of the side edge of the absorber 4, and the side flap portion 5 is formed from the back sheet 3 and the side sheet 8 laminated thereon, and between the two sheets. , A leg-surrounding elastic member 9 is disposed.

A stretchable elastic member 10 is arranged on a side edge of the top sheet 2, and a three-dimensional gather 11 that rises upward from the side sheet 8 as a rising point is formed. In addition, as a three-dimensional gather, the base end is the absorber 4
Although an example in which it is located outside is shown, it is not always necessary to be outside the absorber, and it may be on the absorber 4.

[0044]

As described above, in the disposable diaper of the present invention, the specified back sheet and side sheet are used, the water pressure resistance of the side flap portion is 100 mmH ₂ O or more, and the air permeability is 1.
0 to 350 cc / cm ² · sec, moisture permeability 400 to 3
By setting it to 000 g / m ² · 24 hr, sweat and urine can be prevented from stuffiness and leakage can be prevented, so that discomfort caused by excretion can be reduced to the wearer, and a comfortable wearing feeling can be obtained. .

[Brief description of the drawings]

FIG. 1 is a plan view of a disposable diaper according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the disposable diaper shown in FIG. 1 is cut along a line XX ′ perpendicular to a longitudinal direction.

[Explanation of symbols]

 1: Diaper for use 2: Top sheet 3: Back sheet 4: Absorber 5: Side flap portion 6: Hot melt adhesive 7: Hole in the back sheet of side flap portion 8: Side sheet 9: Elastic elastic member around leg 10: Elastic elastic member 11: Three-dimensional gather 12: Opening 13: Elastic elastic member around waist 14: Back body 15: Fastening tape 16: Front body 17: Reinforcement tape

Continued on the front page (72) Inventor Hiroyuki Kido 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Shinonome Research Center F term (reference) 3B029 BC03 BC06 BD11 BD13 4C098 AA09 CC07 CC10 CC12 CE06 4F100 AK04 AK07 AK41 AR00A BA02 CB03 DC11B DG15B GB72 JD02B JD04B JD05A JL06 YY00B

Claims (6)

[Claims] 1. A part comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between these two sheets, and a position on both side edges in the width direction of the absorber. In a disposable diaper having a side flap portion extending outward, the side flap portion is formed of a liquid-impermeable back sheet and a side sheet made of a nonwoven fabric laminated on the upper surface thereof. The back sheet of the side flap portion is 25 to 900.
μm holes are provided at a rate of 1 to 40 holes / cm ² , and the side flap portion is made of JISL109.
The water pressure measured according to ₂ is 100 mmH ₂ O or more,
The air permeability measured according to JIS L1096 is 1.0
JIS Z02 at ~ 350.0 cc / cm ² · sec
08 to 400 to 3000 g /
A disposable diaper characterized by having a m ² of 24 hours. 2. JI of the back sheet of the used diaper
The opacity measured according to the SP8138A method is 50
%. The disposable diaper according to claim 1, wherein the diaper is not more than%. 3. The back sheet of the side flap portion occupying the total area of the back sheet outer surface of the disposable diaper including the back sheet portion of the side flap portion and the other back sheet portion of the disposable diaper. The disposable diaper according to claim 1 or 2, wherein the area is 15 to 40%. 4. A leg-stretchable elastic member is arranged between a side sheet and a back sheet forming the side flap portion.
Use diapers described in the section. 5. The sheet according to claim 1, wherein the back sheet portion of the side flap portion and the other back sheet portion of the disposable diaper are formed integrally with each other. Use diapers described in the section. 6. The entire back sheet of the disposable diaper includes only a back sheet portion of a side flap portion.
6. The disposable diaper according to claim 5, wherein holes of 5 to 900 [mu] m are provided at a rate of 1 to 40 holes / cm < ² >.