KR19980081545A - Absorbent article for treating body fluids - Google Patents

Abstract

The present invention relates to an absorbent article for body fluid treatment, which improves liquid resistance, air permeability, surface friction strength and the like of flaps on both sides of an absorbent article for body fluid treatment such as sanitary napkin.

The absorbent article for treating body fluids according to the present invention has flaps 10 on both sides thereof. The flaps 10 include first and second fiber layers (spunbond or spunlaced nonwoven fabric) 11a and 11b, And a third fiber layer (melt blown nonwoven fabric) 11c interposed integrally with the first fiber layer 11c.

Description

Absorbent article for treating body fluids

More particularly, the present invention relates to an absorbent article such as a sanitary napkin or pad for absorbing and retaining the menstrual discharge of women, a female incontinence pad, and the like.

BACKGROUND ART [0002] Conventionally, for example, in a sanitary napkin that absorbs and retains menstrual discharge of women, it is known that a flap having liquid resistance (or barrier property) is disposed on the opposite side of a sanitary napkin.

However, the flap is made of a moisture-impermeable plastic sheet which is easily permeable to the surface of the body fluids, has moisture permeability but is poor in liquid impermeability and / or is easily napmed by friction due to the crotch of the wearer, Or composed of a composite sheet of a relatively rigid plastic film and a nonwoven fabric which is composed of a nonwoven fabric which is also broken or which is not gently adhered to the wearer's crotch.

The preferred performance of the flaps is that the body fluids flow over the surface of the flaps so that they do not leak sideways, that the body fluids are not easily permeable, that they are relatively easy to bend or break due to friction by the crotch of the wearer And that it should be gently adhered to the skin of the wearer's crotch.

An object of the present invention is to provide an absorbent article for body fluid treatment, which has the above-described desirable properties and is able to solve the above-mentioned drawbacks.

1 is a plan view of a sanitary napkin as an example of an absorbent article for body fluid treatment according to the present invention.

2 is an enlarged cross-sectional perspective view taken along line 2-2 of Fig.

3 is an enlarged cross-sectional view of a nonwoven fabric constituting the second flap;

Fig. 4 is an enlarged perspective view similar to Fig. 2, but is an enlarged perspective view showing another embodiment. Fig.

Fig. 5 is an enlarged perspective view similar to Fig. 2 but is an enlarged perspective view showing another embodiment. Fig.

Description of the Related Art

1: laminated panel

3: Skin contact surface

4: Skin non-contact side

5: Top sheet

6: back sheet

7: Core

9: first flap

10: second flap

11: Nonwoven fabric

11a: first fibrous layer

11b: second fibrous layer

11c: third fibrous layer

The laminated panel includes a liquid-pervious topsheet positioned on the skin-contacting surface, a liquid-impervious backsheet positioned on the skin-non-contacting surface, and a liquid-impervious backsheet disposed on the skin- A first flap having liquid resistance formed in at least the back sheet extending outward in the transverse direction from an opposite side edge of the core, and a liquid fl exible liquid fl oW lined side by side with the first flap, The present invention relates to an improvement of an absorbent article for bodily fluid treatment comprising two flaps.

The second flap is made of thermoplastic synthetic fiber having a density of 1 denier or more and has air permeability. The second flap is made of extremely fine thermoplastic synthetic fiber smaller than the denier. And a third fibrous layer integrally interposed between the first fibrous layer and the second fibrous layer and having a water resistance higher than that of the first and second fibrous layers and having air permeability.

One of the embodiments of the present invention is that the first and second fibrous layers are spun-bonded nonwoven fabrics.

In one embodiment of the present invention, the first and second fiber layers are spun lace nonwoven fabrics.

According to one embodiment of the present invention, the third fiber layer is a melt blown nonwoven fabric.

According to one embodiment of the present invention, the basis weight of the second flap is 10 to 30 g / m ² .

According to one embodiment of the present invention, the water pressure value of the third fibrous layer is at least 30 mm.

In one embodiment of the present invention, the fiber constitution ratio of each of the first and second fiber layers is 20 to 45% by weight, and the fiber constitution ratio of the third fiber layer is 10 to 60% by weight.

One of the embodiments of the present invention is that the fiber fineness of the first and second fiber layers is 1 to 3 denier and the fiber fineness of the third fiber layer is less than 1 denier.

One of the embodiments of the present invention is that the longitudinal stress in the second flap at 5% elongation is 400 to 1000 g / 25 mm and the transverse stress is 50 to 300 g / 25 mm.

One of the embodiments of the present invention is that the lamination of the first and second fibrous layers and the third fibrous layer is held by fusion-bonded portions by dot-shaped embossing which is intermittently distributed.

According to one embodiment of the present invention, the area ratio of the fused portion is 5 to 30%.

One of the embodiments of the present invention is that the lamination of the first and second fibrous layers and the third fibrous layer is kept in fiber entanglement.

With reference to the drawings, an embodiment of the absorbent article for body fluid treatment according to the present invention will be described by taking a sanitary napkin or pad absorbing and retaining menstrual blood as an example.

1 and 2, the sanitary napkin includes a laminated panel 1, and the laminated panel 1 has a skin contact surface 3 and a skin non-contact surface 4. The laminated panel 1 includes a liquid-pervious topsheet 5 forming a skin-contacting surface 3, a liquid-impervious backsheet 6 forming a skin-noncontacting surface 4, and a liquid- (7). The topsheet 5 and the backsheet 6 have a size that covers the core 7 and extends outwardly from the outer peripheries of the topsheet 5 and the backsheet 6 and has flaps 8 at both ends Thereby forming flaps 9 on both sides. However, the top sheet 5 is smaller in size than the back sheet 6 in the width dimension. Therefore, in the flap 9, both side edges of the back sheet 6 extend outward beyond both side edges of the top sheet 5. The top sheet 5 forming each of the flaps 8 and 9 and the extended portion of the back sheet 6 are joined to each other by well-known bonding means such as welding or adhesive.

As the constituent material of the absorbent article for body fluid treatment such as a sanitary napkin, known ones are used for the top sheet 5, the back sheet 6 and the core 7. More specifically, as the top sheet 5, for example, a liquid-pervious nonwoven fabric having or not having a plurality of pores or capillaries, or a plastic film having a plurality of pores or capillaries is used. As the back sheet 6, for example, a moisture-permeable plastic film or a laminated plastic sheet of this and a non-woven fabric is used. As the core 7, for example, a mixture of wood flap pulp and superabsorbent hydrogel particles is used. Examples of the nonwoven fabric include polyolefin-based, polyester-based, and polyamide-based nonwoven fabrics of melt blow, spun lace, needle punch, thermal bond, spun bond and chemical bond. These nonwoven fabrics include fibers having a basis weight of 10 to 45 g / m ² and having a fineness of 0.1 to 10 denier. Examples of the plastic film include a low-density polyethylene film containing inorganic particles and having a plurality of micropores applied by stretching treatment. Examples of the hydrogel include self-crosslinking acrylic acid alkali metal salt polymer, starch graft polymer, cellulose modified product and water-soluble polymer crosslinked product.

A flap 10 is positioned on the upper surface of each flap 9. [ Each of the flaps 10 is composed of a nonwoven fabric 11 as shown in Fig. The nonwoven fabric 11 is made of thermoplastic synthetic fibers having a density of 1 denier or more and is formed of first and second fiber layers 11a and 11b having air permeability and extremely fine thermoplastic synthetic fibers smaller than denier thereof, And a third fiber layer 11c integrally interposed between the first and second fibrous layers 11a and 11b and having a water pressure higher than that of the first and second fibrous layers 11a and 11b and having air permeability.

Examples of the material of the first, second and third fiber layers 11a, 11b and 11c include polyolefin-based, polyester-based and polyamide-based nonwoven fabrics. Particularly preferably, the first and second fibrous layers 11a and 11b are spunbond or spunlaced nonwoven fabrics, and the third fibrous layer 11c is a melt blown nonwoven fabric. The basis weight of the nonwoven fabric 11 is 10 to 30 g / m ² , the first and second fibrous layers 11a and 11b each occupy 20 to 45 wt%, and the third fibrous layer 11c is 10 to 30 g / By weight and 60% by weight is preferable in obtaining the desired strength and feel. The third fibrous layer 11c has a fiber density higher than that of the first and second fibrous layers 11a and 11b, that is, a space between the fibers is small, so that air permeability is low, but it is possible to impart desired ventilation to the sanitary napkin. If the basis weight and the weight percentage are less than the above-mentioned values, the desired strength can not be obtained, and if the basis weight and the weight percentage are exceeded, the desired touch can not be obtained. If the third fibrous layer 11c is less than 10% by weight, desired water pressure can not be obtained. This water pressure value is preferably 30 mm or more in the measurement according to the JIS standard. If the water pressure value is less than the above-mentioned value, the liquid resistance is insufficient and body fluids are liable to permeate, which is not preferable. The first and second fibrous layers 11a and 11b are 1 to 3 denier and the third fibrous layer 11c is a so-called extremely fine fiber having a density of less than 1 denier. ) Is preferable in obtaining the desired water pressure value, strength and feel of the nonwoven fabric 11.

In addition, in order to avoid feeling of rigidity when wrinkles are formed, the stress in the longitudinal direction is preferably 400 to 1000 g / 25 mm at the time of 5% elongation, Is preferably 50 to 300 g / 25 mm, but such a nonwoven fabric 11 is obtained by the above-mentioned fiber constitution.

The lamination of the first, second, and third fiber layers 11a, 11b, and 11c is maintained by fiber entanglement by a fused portion by a heat embossing treatment or an intermittent high-speed water treatment. It is preferable that the respective layers are held as described above in order to obtain the desired strength and tactile feeling of the nonwoven fabric 11. In the case of a fused portion by thermal embossing, the area ratio of the fused portion is preferably 5 to 30%, and if it is less than the above value, the desired strength can not be obtained, and if it exceeds that value, And the air permeability also decreases.

The second flap 10 shown in Figure 2 has a base end region 12 and a free end region 13 and a base end region 12 in the state where the free end region 13 is collapsed inward. And the longitudinally opposite end portions 14 of the free end region 13 are integrally joined to the upper surface of each flap 9 by a known joining means such as welding or bonding. The free end region 13 is provided with an elastic member 16 which contracts in the sleeve 15 formed by folding inward of a part thereof. The elastic member 16 is fixed by a known hot-melt adhesive agent, and tends to stand up in the free end region 13 due to its shrinkage.

Each of the flaps 10 shown in Fig. 4 has a base end region 12 and a free end region 13, and the base end region 12 and the free end region 13, The longitudinally opposite end portions 14 of the free end region 13 are integrally joined to the upper surface of each flap 9 by a known joining means such as welding or adhesive. The free end region 13 is provided with the elastic member 16 which contracts in the sleeve 15 formed by folding inwardly of the portion thereof and the elastic member 16 is fixed with the known hot melt adhesive And the tendency to stand up in the free end region 13 due to the contraction is substantially the same as the embodiment of Fig.

Each flap 10 shown in Fig. 5 is the same as the embodiment shown in Figs. 2 and 4 in that it has a base end region 12 and a free end region 13, And is folded in a U-shape to form a sleeve as a whole. Both base end regions 12 are integrally joined to each other by well-known bonding means such as welding and adhesive in a state in which the flap 9 is sandwiched therebetween. The elastic member 16 which is contracted along the inner surface of the bent edge of the free end region 13 is located and the elastic member 16 is fixed by a known hotmelt adhesive agent and the free end region 13 ) Is substantially the same as the embodiment of Fig. The elastic member 16 shown in Fig. 5 is curved to have a substantially U-shaped cross section with a relatively wide width, thereby giving the free end region 13 excellent flexibility and elasticity (cushioning). In the case of the elastic member 16 having excellent cushioning property, it may not necessarily be attached so as to shrink.

As the elastic member 16, natural or synthetic rubber, elastomer or the like is used. As the elastic member 16 shown in Fig. 5, polyurethane having an open cell is suitable. This polyurethane is not only rich in flexibility, but also has ventilation and liquid-absorbing properties.

According to the absorbent article of the present invention, the body fluid does not flow from the surface of the second flap or penetrate the second flap to leak from the side edge of the article, and also has ventilation property, And yet has the desired flexibility so that it is sufficiently close to the wearer's crotch portion and nevertheless does not cause napping or breakage due to friction caused by the crotch portion of the wearer.

More specifically, the reasons are summarized as follows. That is, since the first and second fibrous layers constituting the second flap are hydrophobic and made of fibers of 1 denier or more, the surface of the first and second fibrous layers is formed of a so-called smooth or smooth It does not have smooth smoothness. Since the third fiber layer constituting the second flap and the middle fiber layer are made of so-called extremely fine fibers having a fineness of 1 denier or less and the spaces between the fibers are smaller than those of the first and second fiber layers, Water pressure value. Since the first and second fibrous layers as well as the third fibrous layer have air permeability, sufficient ventilation is provided between the article and the skin of the wearer. The second flap is composed of the first, second, and third fiber layers, that is, the entirety of which is made of fibers, so that it has the desired flexibility and adheres to the skin of the wearer. Since the first and second fibrous layers are made of fibers of 1 denier or more, that is, they are different from the extremely fine fibers of the third fibrous layer, the fibers are broken by the friction caused by the crotch part of the wearer, The surface friction strength is not high enough.

Claims (12)

And a laminate panel having a skin contact surface and a skin noncontact surface, wherein the laminate panel has a liquid-pervious topsheet positioned on the skin-contact surface, a liquid-impervious backsheet positioned on the skin non-contact surface, A liquid core, A first flap having liquid resistance formed on at least the back sheet extending outward in the transverse direction from the opposite side edge of the core and a second flap having liquid resistance which is arranged in parallel with the first flap, In the absorbent article for treatment, Wherein the second flap is made of a thermoplastic synthetic fiber having a denier of at least 1 denier, and has first and second fiber layers having air permeability, and made of extremely fine thermoplastic synthetic fibers smaller than the denier, And a third fiber layer having a water pressure value higher than that of the first and second fiber layers and having air permeability. The absorbent article according to claim 1, wherein the first and second fibrous layers are spunbonded nonwoven fabrics. The absorbent article according to claim 1, wherein the first and second fibrous layers are spun lace nonwoven fabrics. The absorbent article according to claim 1, wherein the third fibrous layer is a melt blown nonwoven fabric. The absorbent article according to claim 1, wherein the basis weight of the second flap is 10 to 30 g / m ² . The absorbent article as set forth in claim 1, wherein the pressure of the third fiber layer is at least 30 mm. The absorbent article as set forth in claim 1, wherein the fiber constitution ratio of each of the first and second fiber layers is 20 to 45 wt%, and the fiber constitution ratio of the third fiber layer is 10 to 60 wt%. The absorbent article according to claim 1, wherein the fiber fineness of the first and second fiber layers is 1 to 3 denier and the fiber fineness of the third fiber layer is less than 1 denier. The absorbent article according to claim 1, wherein the longitudinal stress in the second flap at 5% elongation is 400 to 1000 g / 25 mm and the transverse stress is 50 to 300 g / 25 mm. The absorbent article according to claim 1, wherein the lamination of the first and second fibrous layers and the third fibrous layer is maintained by a fused portion formed by intermittently distributed dot-shaped embossing. The absorbent article according to claim 10, wherein the area ratio of the fused portion is 5 to 30%. The absorbent article according to claim 1, wherein the lamination of the first and second fibrous layers and the third fibrous layer is held in fiber entanglement.