JPS604495Y2 - absorbent articles - Google Patents

Description

[Detailed description of the invention] This invention relates to an absorbent article used as a sanitary napkin, a disposable diaper, an absorbent pad, etc.

Regarding conventional absorbent products such as sanitary napkins, the characteristics that are particularly desired are that they have a high ability to quickly absorb menstrual blood (absorption rate), and that menstrual blood can be absorbed easily on the nonwoven surface. It has the ability to absorb blood locally without spreading it as much as possible (spot property), and it has the ability to prevent the absorbed menstrual blood from returning to the outside when external pressure is applied (return prevention).

In order to improve these performances, various improvements have been made to the surface nonwoven fabric and absorbent material, and proposals have also been made to provide a cotton layer made of rayon, acetate, or other synthetic fibers directly below the surface nonwoven fabric. .

However, these sanitary napkins cannot be said to have sufficient effects in terms of liquid absorption speed, spotting properties, and prevention of backflow.

Furthermore, if the amount of the cotton layer is simply increased, the absorption rate is improved to some extent, but there is almost no improvement in spotting properties, particularly in preventing relapse.

This invention provides an absorbent article with improved absorption speed, spotting properties, and anti-reversion properties, which will be explained in detail below based on the accompanying drawings.

FIG. 1 shows an example of the cross section of the absorbent article of the present invention, in which a lower cotton layer 2 is placed on an absorbent body 1, and an intermediate paper 3 made of paper or nonwoven fabric is stacked on top of the lower cotton layer 2. The whole is wrapped with a leakproof material 4 so that the upper part is mostly open, the upper cotton layer 5 is placed on the intermediate paper 3, and the whole is wrapped with a nonwoven fabric 6 from above as shown in FIG. The whole is made of a rectangular laminate with the terminals partially overlapped on the lower side, and the upper cotton layer 5 is made of a hydrophobic material and the lower cotton layer 2 is made of a hydrophilic material. .

As the material for the absorbent body 1, conventional materials such as absorbent paper and/or crushed flocculent pulp, processed paper obtained by sandwiching and pressing an absorbent polymer between sheets, and a mixture of flocculent pulp and absorbent polymer can be used.

The materials used for the lower cotton layer 2 are hydrophilic rayon cotton,
Acetate cotton or a mixture thereof, with a basis weight of 1
A range of 5 to 35 g/d is appropriate, preferably 20 to 35 g/d.
It is 15g/d.

Examples of the intermediate paper 3 include weakly waterproof paper, nonwoven rayon fabric, and weakly liquid water-based rayon paper.

Examples of materials used as the leakage preventive material 4 include so-called waterproof paper treated with waterproofing, a polyvinyl alcohol film, and a waterproof paper laminated with a polyethylene film.

The material used for the upper cotton layer 5 is hydrophobic acrylic fiber, strongly water-repellent treated rayon cotton, nylon fiber, polyester fiber, or a mixture thereof, and has a basis weight of 15 to 3.
A range of 0 g/d is appropriate, preferably 15 to 20 g
/d.

Examples of non-woven fabric 6 include so-called rayon paper, which is made from thin paper with rayon fibers, non-woven fabric made from a thin layer of de-papered cotton or rayon cotton made into a sheet using a binder, and synthetic fibers such as polyester cotton, polypropylene cotton, and acrylic cotton. Non-woven fabrics such as non-woven fabrics, dry-processed woven fabrics made of crushed pulp layered with a binder, and spunbond non-woven fabrics made of synthetic fibers intertwined in a net-like manner are used.

The absorbent article of the present invention uses a hydrophobic material for the upper cotton layer 5,
It is characterized by having two layers of cotton layers using a hydrophilic lower cotton layer 2 with an intermediate paper 3 interposed between them.A particularly preferred specific combination of these is an upper cotton layer, an intermediate paper,
Examples of the lower cotton layer include polyester fiber/weakly waterproof paper/rayon cotton, polyester fiber/weakly water-repellent rayon paper/rayon cotton, and the like.

The reason for having two layers of cotton layers is that when absorbing liquid, there are more gaps between the cotton layers, which increases the absorption speed, and also to prevent the liquid from separating from the absorbent body 1 when pressure is applied from the outside. Furthermore, when the liquid rises from the lower cotton layer 2 to the upper part, it is somewhat blocked by the intermediate paper 3 and the liquid spreads laterally, so the amount of liquid reaching the upper cotton layer 5 decreases, and at this time, the lower cotton layer 2 becomes rayon. In the case of hydrophilic fibers such as cotton, the amount of liquid running horizontally increases and the amount of liquid that passes through the upper cotton layer 5 and reaches the nonwoven fabric 6 on the surface decreases, so the amount of liquid returned is small and the spot surface This is because it also becomes smaller.

Moreover, such an effect is preferable in the case of an absorbent article in which the intermediate paper 3 is rolled up to the lower side of the absorbent body 1, as shown in FIG.

According to the absorbent article of the present invention, the upper cotton layer, the intermediate paper, and the lower cotton layer are incorporated into the constituent materials, and the absorption rate is improved, which was considered to be insufficient in conventional absorbent articles. We were able to solve the following problems all at once: an increase in the amount of paint, a decrease in the amount of relapse, and an improvement in spotting properties.

Example 1 For convenience of explanation, the upper cotton layer 5 is A1 and the intermediate paper 3 is B1.
The lower cotton layer 2 is called C.

The constituent materials of the absorbent article used in the experiment are as follows.

This invented product A, B, and C are all shown in Table-1.

Absorbent material 1: 4 sheets of absorbent paper with a basis weight of 25 g/d are stacked, and a mixture of cotton-like pulp 160 g/d and absorbent polymer 40 g/171'' is mixed on top of the sheets, sandwiched between absorbent paper and weakly waterproof thin paper. A layer of moderately pressed pieces.

Leak proof material 4: Polyethylene laminate paper.

Nonwoven fabric 6: Nonwoven fabric mixed with polyester cotton, polypropylene cotton, and rayon cotton.

All the materials other than those shown in Comparison Product Table-1 are the same as the constituent materials of the product of the present invention.

Table 1 shows the experimental results for the invented product and the comparative product.

The experimental items were conducted in the following manner.

Absorption rate Place an iron plate with a hole in the center on top of the sample placed horizontally.

A cylinder with an inner diameter of 23.8 mm is joined to the hole.

A pressure of 8g/y4 was applied to the sample, and simulated menstrual blood (electrolyte concentration 0.89%, surface tension 42dyne/5e
e) Inject 10ml at once, measure the time until the liquid is absorbed on the sample surface, and calculate the absorption rate.

Return amount After 2 minutes, stack two pieces of absorbent paper on top of the sample used for measuring the liquid absorption rate above, and then apply 50% of the absorbent paper evenly from above.
A pressure of g/y4 was applied and left for 2 minutes, and then the amount of liquid that returned to the absorbent paper side was weighed and used as the returned amount.

Spot property The area of the surface nonwoven fabric of the sample used for measuring the amount of return that is stained with the red color of simulated menstrual blood is defined as spot property.

Experimental Example 2 Regarding the same product of the present invention used in Experimental Example 1, **A,
Table 2 shows the results of experiments conducted with various changes in B and C.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing a cross section of the absorbent article of the present invention;
The figure is a sectional view of a modified version of the absorbent article of the present invention. 1...Absorbent body, 2...Lower cotton layer, 3.
... Intermediate paper, 4 ... Leak proof material, 5 ...
...Top cotton layer, 6...Nonwoven fabric.

Claims (1)

[Claims for Utility Model Registration] 1. A lower cotton layer 2 is placed on an absorbent body 1, and an intermediate paper 3 made of paper or nonwoven fabric is layered on top of the absorbent body 1, and the entire layer is left open at the top to prevent leakage. It consists of a rectangular laminate in which the upper cotton layer 5 is placed on the intermediate paper, and the whole is covered with a nonwoven fabric 6 from above, and the upper cotton layer 5
An absorbent article made of a material in which the lower cotton layer 2 is hydrophobic and the lower cotton layer 2 is hydrophilic. 2. An absorbent article according to claim 1 of the utility model registration, in which the intermediate paper 3 is rolled up to the bottom of the absorbent body 1.