JPS60231855A - Laminated nonwoven fabric - 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 The present invention is a so-called "dry touch" product that has excellent water absorption but has almost no surface wettability, and can be used as a surface material for sanitary napkins and disposable diapers, as well as hand towels and makeup removers. The present invention relates to a laminated nonwoven fabric that can be suitably used as a cloth for use.

In conventional sanitary napkins and disposable diapers, in order to eliminate the sticky feeling caused by wetness during use, the surface material is made of nonwoven fabric made of hydrophobic fibers.
Satisfactory "dry touch" performance cannot be obtained unless the nonwoven fabric is considerably thick (for example, has a basis weight of 30 g/m' or more). However, when such a thick nonwoven fabric is used, flexibility is inevitably lost, resulting in a poor usability as sanitary napkins, paper diapers, and the like.

Therefore, in order to improve the above-mentioned drawbacks, a structure in which a cotton layer made of stable rayon is further interposed between the nonwoven fabric layer and the absorbent layer has been developed. In this way, even if the nonwoven fabric layer is thin with a basis weight of about 15 to 20 g/rn', the "dry touch" property and flexibility can be improved to a satisfactory degree, but the addition of the cotton layer will require additional man-hours. In addition to the problem of increased cost and the resulting increase in costs, new processing problems have been brought about. For example, in the case of sanitary napkins, the longitudinal ends of the laminate consisting of the nonwoven fabric layer, cotton layer, and absorbent layer are usually heat-sealed. Because there is a cotton layer made of non-thermally adhesive rayon stable, some parts remain that are not completely heat-sealed, resulting in defective products. The present invention provides a solution to the above-mentioned problems, and provides a soft feel, excellent water absorption, and "dry touch".
A laminated nonwoven fabric with excellent workability and
In particular, the present invention provides a laminated nonwoven fabric suitable as a material for liquid absorbent articles such as sanitary napkins and disposable diapers.

The gist of the present invention resides in a structure in which a cotton layer made of stable rayon is integrally laminated between two dry-laid nonwoven fabric layers containing a specific amount of heat-adhesive conjugate fibers.

In the above basic configuration, the heat-adhesive conjugate fibers constituting the dry nonwoven fabric layer are usually 30-1°0% (by weight, the same applies hereinafter), preferably 50-70% of the heat-adhesive conjugate fibers. It is composed of 70 to θ%, preferably 50 to 30% of rayon and/or polyester fibers, polypropylene fibers, or polyamide fibers, each singly or in a mixture.

Here, as the heat-adhesive composite fiber, for example, a fiber having a double structure in which the core part of the fiber is made of polypropylene and the surface part is made of a low melting point resin such as polyethylene is used, and commercially available products include, for example, the product name Examples include rNBFJ (Daiwabo Co., Ltd.) or the product name "ES Fiber" (Chisso Co., Ltd.).

The above composite single-layer fiber is used as a constituent material of a dry-laid nonwoven fabric together with a residual amount of rayon and/or polyester fiber, polypropylene fiber, or polyamide fiber, each alone or in a mixture (or blend). If it is less than 30%, there will be fewer bonding points during thermal bonding, resulting in a decrease in mechanical strength. The thickness of this composite fiber is preferably in the range of 1°5 to 2.0 denier (d) in terms of providing a soft feel; 3. Exceeding Od gives a rigid feel, which is not desirable. Furthermore, short fibers having a length of usually 30 to 70 mm are preferable.

On the other hand, rayon and/or polyester fibers, polypropylene fibers, or polyamide fibers require almost the same conditions as those for the above-mentioned composite fibers, and the fiber thickness ranges from 1.5 to 2. Od, fiber length is preferably in the range of 30 to 50 am.

The basis weight of the dry nonwoven fabric layer constituting the present invention varies depending on the use, but is suitably approximately 5 to 15 g/m''.The basis weight of the cotton layer made of rayon stable also varies depending on the use. However, those with a weight of 5 to 15 g/m' are excellent in terms of flexibility and feel.The basis weight of the entire laminated nonwoven fabric is preferably 20 to 40 g/nf.

The novel nonwoven fabric according to the present invention is produced by sandwiching a cotton layer made of stable rayon between two layers of webs made of composite fibers and synthetic fibers adjusted to an appropriate blending ratio, and then Heating to a temperature above the melting point of the melting point resin,
Obtained by applying pressure.

A manufacturing example will be shown below, but of course this is an illustration and is not intended to limit the technical scope of the invention.

With reference to the accompanying drawings, the fiber thickness 2. known as rNBFJ, which was conveyed from the card machine (1, r), respectively. O
d, a mixed web with a basis weight of 7 g/rn' (2
, 2') with a fabric weight of 10g/rn' consisting only of rayon stable with a fiber thickness of 0°5d and a fiber length of 45m.
Laminated nonwoven fabric (6) sandwiched between webs (3) and heat-pressed by heating rolls (4, 4') and embossing rolls (5, 5°) while being continuously fed and wound into a roll 17).
I got it. This laminated nonwoven fabric has excellent liquid permeability and water retention, and does not give a sticky feeling when used.
It has a very good usability.

Although an example of the manufacturing means and the manufacturing of one embodiment of the present invention have been described above, it is obvious that the manufacturing means and the type of product using the product of the present invention are not limited to these, and the design thereof is not limited to this. By making changes, it is possible to provide products with excellent texture, absorbency, water retention, breathability, etc. for absorbing body fluids or exudates, such as sanitary napkins, surgical pads, and diapers. .

[Brief explanation of the drawing]

The drawing is a schematic explanatory view showing an example of a means for manufacturing the product of the present invention. The meanings of the symbols in the diagram are as follows: □ 1, r: card machine, 2. z: web of dry nonwoven fabric, 3
: Rayon stable web, 4.4': Heating roll, 5.5': Empos roll, 6: Composite nonwoven fabric (Ba
, 6b:6 nonwoven layer), 7:6 roll.

Claims (1)

[Scope of Claims] (13 Heat-adhesive composite edge #30-100% and rayon and/or other synthetic fibers 70-70% θ% between two dry-laid non-woven fabric layers, made of rayon stabilizer. A laminated nonwoven fabric characterized by having a cotton layer integrally laminated. [2] The nonwoven fabric layer is made of 30-100% thermoadhesive composite fibers.
and 70 to θ% of rayon and/or polyester fiber, polypropylene fiber, or polyamide fiber.