JPH0475655A - Absorptive articles - Google Patents

Abstract

PURPOSE:To obtain the absorptive articles which are excellent in the diffusivity of body fluid by disposing a specific diffusion layer and liquid permeation control layer on a main absorber layer, the absorber of which consists of a blank material having excellent water absorbing and retaianing properties. CONSTITUTION:The absorptive articles are constituted of the absorber 1 which absorbs and holds the body fluid, a liquid permeable surface material 2 in which this absorber covers the use surface side in contact with the skin, and a liquid impermeable leakproof material 3 which covers the unused surface side. The absorber 1 is disposed with the diffusion layer 5 which has >=90mm water absorption height after 3 minutes when measured by a water absorbance testing method in a Klemm method of paper, and is used to diffuse liquid and the liquid permeation control layer 6 which has >=20% and < 50% liquid permeation to assist the diffusion of the liquid by the diffusion layer on the main absorber layer 4 consisting of the blank material having the high water absorbing and retaining properties. Then the discharged body fluid permeates the diffusion layer 5 while diffusing therein and thereafter, the permeation rate thereof is adjusted and leveled off in the liquid permeation control layer 6. The body fluid is thus dispersed in this layer and is absorbed into the main absorber layer 4 in the state of being widely diffused over the entire part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to absorbent articles such as sanitary napkins and disposable diapers, and more specifically relates to absorbent articles with excellent dispersibility of body fluids. It is something.

[Prior Art] For example, a sanitary napkin, which is a type of absorbent article, has a liquid-permeable surface material on the use side that contacts the skin of an absorbent material that absorbs and retains body fluids, and an unused surface material on the opposite side. It has a structure in which a liquid-impermeable leakage prevention material is arranged on each surface side, and as the above-mentioned absorbent paper, water-absorbing paper is used because it has a large absorption capacity and superior liquid retention ability during absorption. Water-absorbing materials such as pulp, pulverized pulp, polymer absorbent materials, and cotton are widely used.

In such sanitary napkins, in order to make the most effective use of the absorbent capacity inherent in the absorbent material, it is necessary to spread and absorb excreted body fluids as evenly as possible throughout the absorbent material. However, in conventional sanitary napkins, the above-mentioned water-absorbing material has poor body fluid diffusion performance when actually used, so body fluid absorption occurs only locally on the absorbent material at the target site for excretion. Therefore, the absorption capacity is small, and it has the disadvantage that leakage is likely to occur when the amount of body fluid excreted is large.

In order to eliminate these drawbacks, the upper layer of the absorbent body is
Another water-absorbent material that has a higher body fluid diffusivity than the water-absorbent material constituting the absorbent body (for example, crepe paper or a material with a density of 0.08
(g/cm) or higher), but it is not possible to obtain a sufficient diffusion effect by simply placing such water-absorbing materials, and the absorbent material It has been difficult to make the most effective use of absorption capacity.

[Problems to be Solved by the Invention] An object of the present invention is to provide an absorbent article with excellent body fluid diffusivity.

Means for Solving Mouth Problems] In order to solve the above problems, the present invention provides an absorbent body that absorbs and retains body fluids, and a liquid-permeable surface that covers the use side of the absorbent body that comes into contact with the skin. In an absorbent article consisting of a material and a liquid-impermeable leak-proof material covering the non-use side, the absorbent body is
1 on the absorbent main layer made of a material with high water absorption and water retention properties.
A diffusion layer for diffusing a liquid with a water absorption height of 90 layers or more after 3 minutes as measured by the paper Klemm water absorption test method, and a diffusion layer for promoting the diffusion of the liquid by the diffusion layer. The device is characterized in that it is constructed by disposing a liquid permeable W calendar having a liquid permeability of 20% or more and less than 50%.

The liquid permeation control layer may be formed of a hydrophobic film or nonwoven fabric with a porosity of 7 to 70%.

[Function] After the body fluid excreted onto the diffusion layer permeates through the diffusion layer while diffusing, the permeation amount is adjusted in the liquid permeation control layer.
By being equalized, it is further dispersed and absorbed in a widely diffused state throughout the main absorbent layer. As a result, compared to conventional methods in which body fluid absorption was performed locally,
The actual saturated absorption capacity of the absorber is improved, and the absorption capacity under actual usage conditions is increased.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a sanitary napkin, which is a type of absorbent article. material 2, and a liquid-impermeable leakage preventive material 3 is provided on the non-use side.

The absorbent body 1 is made of absorbent paper, pulverized pulp, polymer absorbent material,
On the absorbent main layer 4 made of a material with high water absorption and water retention properties such as cotton, there is a diffusion layer 5 with excellent body fluid diffusivity for diffusing excreted body fluids, and the amount of body fluid permeated through the diffusion layer 5. It has a structure in which at least two layers are superimposed, including a liquid permeation control layer 6 that adjusts and equalizes the body fluid to promote diffusion of the body fluid and supply it to the main absorption layer 4.

In this way, the diffusion layer 5 and the liquid permeation control N6 are provided on the absorption main layer 4.
By providing this, the body fluid excreted onto the diffusion layer 5 passes through the diffusion layer S without being diffused, and then the permeation amount is adjusted and equalized in the liquid permeation control layer 6. It is dispersed and absorbed throughout the main absorption layer 4 in a widely diffused state. As a result, compared to conventional absorbers that absorbed body fluids locally, the actual saturated absorption amount of the absorber 1 is improved, and the absorption amount in actual use is increased.
This makes it possible to prevent leakage and make the absorber 1 more compact.

The diffusion layer 5 in the absorbent body 1 is made of a water-absorbing material having a water absorption height of 90 mm or more after 3 minutes when measured by the paper Klemm water absorption test method (JIS-P814). Examples of such water-absorbing materials include paper, nonwoven fabric, cellulose sponge, and PVA sponge. If the water absorption height of the diffusion layer 5 is lower than 90 m, the liquid diffusivity of the absorber 1 will be poor, and the absorption capacity and absorption rate will be small, making leakage likely to occur.

In addition, the liquid permeability control layer 6 has a liquid permeability of 20% or more and 50% or more.
%. Examples of water-permeable materials having such a liquid permeability include perforated films and nonwoven fabrics in which a large number of planar or three-dimensional pores are perforated in a polyethylene film with a size and density that allow the above-mentioned liquid permeability to be obtained. . Note that the liquid permeability of the liquid permeation control layer 6 is 2
If it is less than 0%, the permeation of bodily fluids into the main absorbent layer 4 will be insufficient, so the absorption capacity of the absorber 1 will be small and leakage will easily occur, and conversely, the liquid permeability will be 50% or more. In this case, the body fluid that has passed through the diffusion layer 5 is guided as it is to the main absorption layer 4 without being diffused, so the effect of promoting the body fluid diffusion ability of the diffusion layer 5 is small, and the absorption capacity of the body fluid absorber 1 is reduced. I can't seem to improve it.

Here, the above-mentioned liquid permeability is measured by the following method. That is, a sample was prepared by superimposing qualitative filter paper No. 2 (7 x 14 cm) on the upper and lower surfaces of a water-permeable material placed horizontally, and an acrylic paper with a circular hole with a diameter of 2 cm in the center was placed on the upper surface of the sample. At the same time as overlapping the plates, a liquid-impermeable acrylic plate was overlaid on the bottom surface, and 2ml (2g) of water was injected through the opening in the upper acrylic plate under a load of 5g/c■2, and the sample absorbed water. The water absorption amount W absorbed by the water-permeable material and the lower filter paper after 2 minutes was measured, and the liquid permeability of the water-permeable material was determined using the following formula.

The surface material 2 covering the use side of the absorbent body 1 is a wet-laid nonwoven fabric or a dry-laid nonwoven fabric mainly composed of natural fibers such as rayon, and/or single fibers or composite fibers such as polypropylene, polyethylene, and polyethylene terephthalate. , can be constructed from spunbond nonwoven fabric, etc., and
The leak-preventing material 3 can be made of a polyethylene film, or a sheet-like fiber aggregate such as waterproof paper or nonwoven fabric bonded with a resin such as polyethylene in the form of a film.

Next, a performance experiment of the present invention will be explained.

(Experiment 1) Samples of sanitary napkins having the same structure as shown in FIG. 1 were formed using the following materials, and the diffusion length, liquid permeability, and absorption amount were measured for each sample. The result is the first
Shown in the table.

Invention 1 Absorbent main layer: granular polymer absorbent material (acrylic acid sorter) sandwiched between two sheets of thin paper Diffusion layer, liquid permeable cellulose sponge with a density of 0.1 g/c++ff Control layer, low-density polyethylene perforated film with 7% porosity surface material, rayon @1130%, 30% polyester fiber, heat-melting composite polyolefin fiber! Material: Polyethylene laminate paper (Invention 2) Same as Invention 1 except that the liquid permeation control layer is composed of a low-density polyethylene perforated film with a porosity of 14%.

<Invention 3> Same as Invention 2 except that the diffusion layer is made of cellulose sponge with a density of 0.5 g/c3.

<Comparative Example 1> Same as Invention 1 except that the liquid permeation control layer was composed of a low-density polyethylene perforated film with a porosity of 3%.

<Comparative example 2> Same as Invention 1 except that the liquid permeation control layer was removed.

Comparative Example 3) Same as Invention 3 except that the diffusion layer was made of cellulose sponge with a density of 0.05 g/c3.

Table 1 The above diffusion length, liquid permeability, and absorption amount were measured as follows.

(1) Water absorption test method in Klemm method for liquid absorption and diffusion paper (JIS-P814
1) Measure the water absorption height after 3 minutes,
This was taken as the diffusion length.

(2) Liquid permeability As mentioned above.

(3) Absorption Amount The sample was attached to an electric human body model using sanitary shorts, and the absorption amount of the sample was measured under the following conditions.

The walking motion condition of the electric human body model was 7 Km/hr, and after 2 minutes of break-in exercise, physiological saline was injected through the tube at a flow rate of 5 ml/win while the model was walking, and it leaked into the sanitary shorts. When this occurred, the injection was stopped, and the amount injected up to that point was taken as the absorbed amount.

[Effects of the Invention] As described above, according to the present invention, by overlaying the diffusion layer with excellent body fluid diffusivity and the liquid permeation control layer that promotes the diffusion of body fluids on the absorbent main layer, It is possible to significantly improve the diffusibility of body fluids, increase the actual saturated absorption amount in the absorber, and increase the absorption amount under actual use conditions. Moreover, the increased absorption capacity not only prevents leakage but also allows the absorber to be made more compact.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention. 1. Absorber, 2. Surface material, 3. Leak prevention material,
4. Main absorption layer 5. Diffusion layer 6.
・Liquid permeability control layer.

Claims (3)

[Claims] 1. Absorbency consisting of an absorbent body that absorbs and retains body fluids, a liquid-permeable surface material that covers the used side of the absorbent body that comes into contact with the skin, and a liquid-impermeable leak-proof material that covers the non-used side of the absorbent body. In the article, the absorbent body has a water absorption height of 90 mm or more after 3 minutes when measured by the paper Klemm water absorption test method on the main absorbent layer made of a material with high water absorption and water retention properties. A diffusion layer for dispersing liquid, and a liquid permeability of 20% or more and 50% for promoting diffusion of liquid by the diffusion layer.
1. An absorbent article characterized by comprising: a liquid permeation control layer having a liquid permeation control layer of less than 10%. 2. The absorbent article according to claim 1, wherein the liquid permeation control layer is a hydrophobic film with a porosity of 7 to 70%. 3. The absorbent article according to claim 1, wherein the liquid permeation control layer is made of a nonwoven fabric.