JPS61179151A - Sanitary napkin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sanitary napkin, and particularly to a sanitary napkin characterized by means for preventing leakage of menstrual blood.

(Prior Art) There are basically two types of sanitary napkins that are generally known and put into practical use. A napkin belonging to the first type is one in which a waterproof back sheet is positioned to cover both widthwise sides of an absorbent body from the bottom surface thereof, and the entirety is covered horizontally with a water permeable outer sheet. For napkins belonging to the second type, a water-permeable top sheet and a waterproof back sheet formed to the same size as the absorbent body are placed on the front and back sides of the absorbent body, respectively, and these three are integrally joined, or A water-permeable top sheet and a waterproof back sheet, which are formed larger than the absorbent body, are placed on the front and back surfaces of the absorbent body, respectively, so that their outer circumferential sides extend outward from the absorbent body. It is formed by integrally joining three extension parts.

(Problems to be Solved by the Invention) Since the napkin of the first type is entirely covered with the outer sheet from which menstrual blood easily oozes, menstrual blood oozes through the outer sheet and migrates to the outer lower surface of the napkin. In addition, in the second type of napkin, the relatively thin top sheet and back sheet directly overlap each other, so menstrual blood seeping into the top sheet is transmitted to the outer lower surface of the back sheet.

In addition, in the first type napkin and the first type napkin in which the absorbent body, the top sheet, and the back sheet are not integrally joined, when menstrual blood is absorbed, they mutually interact. defected to.

Furthermore, the first type of napkin cannot maintain its waterproof structure because the back sheet deforms due to the movement of the wearer. Therefore, menstrual blood leaks from the napkin and stains the skin and underwear.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned drawbacks, and the gist of the present invention for achieving the purpose is to provide a water-permeable surface layer, a waterproof surface layer, and a water-permeable surface layer. In a sanitary napkin consisting of a back layer and an absorbent layer positioned between them, at least the width of the absorbent layer is smaller than that of the water permeable surface layer and the waterproof back layer, and A waterproof outer layer made of an aggregate of hydrophobic fibers is arranged between the water-permeable surface layer and the waterproof back layer on both sides in the width direction, and the water-permeable surface layer.

The napkin includes the waterproof back layer, the absorbent layer, and the waterproof outer layer that are integrally combined.

Further, the present invention will be explained based on illustrated examples.

It is as follows.

The present invention consists of a water-permeable surface layer 1, a waterproof back layer 2, an absorbent layer 3,
and a waterproof outer layer 4. The front layer 1 and the back layer 2 are formed to have a width and length larger than those of the absorbent layer 3, and the absorbent layer 3 is formed so that the outer peripheries of the front surface M1 and the back layer 2 extend from the outer periphery thereof. It is located between layers 1 and 2. The outer side M4 is the outer peripheral side of the absorbent layer 3 and is located between the front layer 1 and the back layer 2.

However, it is sufficient that the outer layer 4 is located at least on both sides of the absorbent layer 3 in the width direction, and does not necessarily have to be located on both sides of the absorbent layer 3 in the length direction.

For the surface layer 1, materials known as surface materials for sanitary napkins and disposable diapers, such as fibrous nonwoven fabrics and microporous synthetic resin films, are used. For the back layer 2, a synthetic resin film or a foam sheet, which is conventionally known as a waterproof material for sanitary napkins, alone or a laminate thereof, or a laminate of the film or the sheet with a fibrous nonwoven fabric, etc. is used. The absorbent layer 3 is made of cotton-like pulp, conventionally known as an absorbent material for sanitary napkins, or a mixture of pulp or a web mainly made of hydrophilic fibers with superabsorbent polymer powder. but,
The materials for the surface layer 1, back layer 2, and absorbent layer 3 preferably contain a heat-fusible material in an amount suitable for bonding to each other by heat-sealing.

In particular, the surface layer 1 and the absorption layer 3 are
! Preferably, the web is made of a porous and highly compressible web described in Japanese Patent No. 1-26254/I. outer layer 4
has a basis weight of 80° in order to provide the necessary waterproofness and thermal adhesiveness between the surface layer 1, the back layer 2, and the absorbent layer 3.
~800g/m, thickness 2-10mm, width 3-20mm, and lR degree 1.4-12d5 length 3-64
An aggregate of nanometer hydrophobic fibers is preferably used.

Further, in order to make the sides of the napkin elastically adhere to each other, it is preferable that the compression elastic recovery rate is 30% or more.

The types and compositions of the hydrophobic fibers are polyester, polypropylene, polyethylene, and acrylic.

Preferably used are those in which the main material is single or mixed fibers such as polyurethane fibers, and the secondary material is low melting point fibers alone or mixed fibers such as polypropylene-polyethylene composite fibers, low melting point polyester fibers, thermoplastic polyester elastomer fibers, etc. Let it go.

The surface layer 1, the back layer 2, the absorbent layer 3 and the outer layer 4 are
In the arrangement shown in the figure, the low-melting point fibers are heated near the melting point of the fibers to fuse and bond them together.

(Example) The basic structure of the napkin was constructed as shown in Fig. 1, and the surface layer,
The back layer, absorbent layer and outer layer were heat treated under light pressure to bond them together.

The composition and performance of the outer layer were as shown in the attached table.

For the back layer, a 0.3 m thick laminate sheet of polyester spunbond nonwoven fabric with a basis weight of 20 g/rrr and a 10 μm thick polyethylene film was used.

The surface layer and the absorption layer are as described in the applicant's Japanese Patent Application No. 59-2.
A multilayer structure given the name "absorber" described in No. 62544 was used. That is, this is
A structure consisting of a first layer forming a surface in contact with the skin, a second layer forming an intermediate part through which body fluids permeate, and a third layer forming a body fluid retaining part; the first layer is 2 denier, 1 polyester fiber with Il fiber length 51 wn 3 each of polyester fiber with elasticity "Toshi's trade name "Hytor""
0% by weight and low melting point polyester fiber "Unitika ■ product name "'Melty'''J/lO weight% which melts at 110 ° C. with 2 denier and fiber length 51wn,
The second layer consists of a sweat-absorbing polyester fiber of 3 denier and MA fiber length of 51 trtn that exhibits hydrophilic properties on the liquid contact surface. 420% by weight.

Consisting of a basis weight of 20 g/m and a density of 0.09 g/c;
The third layer consists of an upper layer and a lower layer; the upper layer is made of rayon fibers of 10 denier and a fiber length of 5]nwn.
0% by weight and the Melch 420% by weight of 4 denier and fiber length 51 nin, and has a basis weight of 100 g/n.
(Consisting of a density of 0.1 g/c!; The lower layer is made of super absorbent polymer "Sanyo Kasei Kyu brand name" T M2O
A mixture of 30% by weight of 0"J, 40% by weight of rayon fiber, and 430% by weight of Melch, and has a basis weight of 150.
g/proof, density 0.2g/cn? and each layer is integrally joined by melting the melty. The first layer corresponds to the illustrated surface layer 1, and the second layer and the third layer correspond to the illustrated absorbent layer 3.

The leakage rate in the table is calculated by placing a filter paper on the bottom of the tested product and using a billet from above] Let OmQ artificial menstrual blood flow down for 10 seconds, leave it for 1 minute, apply a 5 kg weight of the same size as the tested product, and place the filter paper on the filter paper. The menstrual blood exuded was measured and calculated using a linear equation.

(Operations and Effects of the Invention) According to the napkin of the present invention, since the outer side of the water permeable surface layer 1 is separated from the waterproof back surface WJ2 via the waterproof outer layer 11, excretion is carried out almost in the central area of the surface layer 1. Even if menstrual blood diffuses to the outside, it will not migrate to the outer lower surface of the back layer 2, and since the outer layer 4 is a collection of fibers and has elasticity to recover from compression, the outside of the napkin will not spread to the outside of the napkin. It elastically adheres to the I5. In addition to preventing menstrual blood from flowing between the skin and the surface of the napkin to the outside and leaking.

In addition, the surface layer], the back layer 2, the absorbent layer 3, and the outer layer 1 are integrally joined and do not separate even when wet with menstrual blood. It can prevent blood leakage.

In addition, the outer layer 4 is not positioned so as to cover both widthwise sides of the absorbent body from the bottom surface of the absorbent body, as is the case with the waterproof back sheet 1 of known napkins, but is positioned on the outside of the absorbent body 3. productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the napkin of the present invention;
FIG. 2 is a sectional view taken along line x-xg in FIG.

Claims (7)

[Claims] (1) In a sanitary napkin consisting of a water-permeable surface layer, a waterproof back layer, and an absorbent layer positioned between these, at least the width of the absorbent layer is greater than that of the water-permeable surface layer and the waterproof back layer. a waterproof outer layer made of an aggregate of hydrophobic fibers is disposed on at least both widthwise sides of the absorbent layer and between the water permeable surface layer and the waterproof back layer, and the water permeable surface the napkin, the waterproof back layer, the absorbent layer and the waterproof outer layer integrally bonded together. (2) The width and length of the absorbent layer are formed smaller than those of the water permeable surface layer and the waterproof back layer, and the water permeable surface layer and the waterproof back layer are formed on the outer peripheral side of the absorbent layer. 2. A sanitary napkin as claimed in claim 1, wherein said waterproof outer layer is arranged between said waterproof outer layer and said waterproof outer layer. (3) The fibers constituting the waterproof outer layer are mainly fibers such as polyester, polypropylene, polyethylene, acrylic, polyurethane, etc., and include polypropylene-polyethylene composite fibers, low melting point polyester fibers, thermoplastic polyester elastomer fibers, etc. The sanitary napkin according to claim 1, comprising low melting point fiber as an auxiliary material. (4) The waterproof outer layer has a basis weight of 80 to 800 g/m
^2. The sanitary napkin according to claim 1, having a thickness of 2 to 10 mm and a width of 3 to 20 mm. (5) The fibers constituting the waterproof outer layer have a fineness of 1.
The sanitary napkin according to claim 1, having a length of 4 to 12 mm and a length of 3 to 64 mm. (6) The sanitary napkin according to claim 1, wherein the water permeable surface layer, the waterproof back layer, the absorbent layer, and the waterproof outer layer are integrally bonded by fusion. (7) The sanitary napkin according to claim 1, wherein the waterproof outer layer has a compression elastic recovery rate of 30% or more.