JPS599612Y2 - Non-woven fabric for sanitary materials - Google Patents

Description

[Detailed description of the invention] This invention mainly relates to nonwoven fabrics used in sanitary materials such as diapers, sanitary napkins, etc., and is used on the side that comes into contact with the human body.

The following conditions are desired for these materials that can be applied directly to the skin and absorb liquids sufficiently.

In other words, it needs to be soft to the touch and not cause unnecessary irritation to the skin, have good cushioning properties and a good texture overall, and have good absorbency so that the surface does not get wet even after absorption. .

And since it is a material for disposable products, it is inexpensive.
In addition, it must be strong enough to withstand processing by high-speed machines and be resistant to deformation, and it is also desirable that it be suitable for heat sealing into products.

This invention satisfies these contradictory conditions.

As shown in FIG. 1, the nonwoven fabric of the present invention is a three-layer composite material, and the first layer 1 is the side that comes into contact with the skin.

This uses non-irritating hydrophobic fibers such as polyester fibers, polyethylene fibers, polypropylene fibers, etc., and what is generally called a carded web is used as the thin layer.

The second layer 2 is a thin film of composite resin having many fine pores, and the third layer 3 is a thin sheet of cellulose fibers with good water absorption properties, and these three layers are laminated together.

Note that it is desirable that these three layers be lightly bonded together by heating and pressing.

Therefore, a carded web is made by mixing low-melting point polypropylene fibers or polyethylene fibers into the first layer of hydrophobic fibers, or by using only these fibers.

For example, the second layer 2 film has a polyethylene thickness of 0.0
6~Q. lmm, hole diameter 0.3 to 0.5mm, number of holes 4
0 to 60 pieces/cm" is used.

As the absorbent layer for the third layer 3, Japanese paper-like crepe paper or the like with a weight of 10 to 15 g/m2 can be used, and these three layers are overlapped and applied with a flat thermal calender or a thermal calender that presses against the filament. , lightly adhere to the entire surface or striations.

In such a structure, liquid that comes into contact with the first layer is absorbed between the fibers of the first layer by capillary action, but the liquid is immediately absorbed into the third layer through the pores of the second layer.

This is because the absorption capacity of the upper and lower layers differs greatly between the pores of the second layer, and the liquid absorbed in the third layer does not seep into the first layer.

That is, the liquid instantly transfers from the first layer to the third layer in one direction.

Therefore, the first layer is not always in a wet state and comes into soft contact with the skin regardless of changes in its state.

Since the main focus here is on materials that melt with heat, heat sealing is possible during processing.

As mentioned above, the nonwoven fabric of the present invention allows liquid to transfer only in one direction, so a material with a higher absorption capacity, such as pulp sheet or superabsorbent polymer material, is placed adjacent to the third layer. Once placed, a large amount of liquid will be adsorbed through the third layer.

Here, it is possible to omit the third layer and cover the superabsorbent polymer sheet with only the first and second layers, but it is possible that the third layer is in close contact with the porous film of the second layer. The necessary condition for adsorption is that the first and second layers are in close contact with each other above and below the pores, as described above, to achieve this effect. Therefore, for example, this nonwoven fabric may be used in the following combinations. I can do it.

Example 1 FIG. 2 An absorbent paper 5 on which a superabsorbent polymer substance has been sprayed and adhered is wrapped from above and below with the nonwoven fabric 4 of the present invention and a plastic film (unpolished) 6, and both ends are heat-sealed.

Note that although there is a space between each layer in the figure, this is for illustrative purposes; in reality, each layer is in close contact with each other.

As a result, the absorbent paper 5 exhibits a large absorption capacity, but the lower part of the figure is completely waterproof, and once absorbed, the liquid will not seep out to the outside.

Example 2 Figure 3 In this, both the upper and lower sides of absorbent paper 5 are covered with the non-woven fabric 4 of the present invention, and by taking advantage of the fact that this non-woven fabric is one-way, it is possible to use either side. It is.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the structure of the nonwoven fabric of the present invention, Figures 2 and 3 are
The figure is an explanatory diagram showing an example of how this nonwoven fabric is used. 1...First layer, 2...Second layer, 3...
...Third layer, 4...Nonwoven fabric, 5...
・Absorbent paper, 6...film.

Claims (1)

[Scope of utility model registration request] A nonwoven fabric for sanitary materials made of or thermally bonded with a thin layer of hydrophobic fibers made of or containing hydrophobic fibers with a low melting point, a composite resin film having many micropores, and a water-absorbing fiber layer.