JPH0340803A - Porous and impermeable insert for use in ap- parel industry - Google Patents

Abstract

PURPOSE: To obtain an air-permeable and impenetrable insert good in outlook and feeling and excellent in resistance to laundering by including a fine porous polymer layer having stable foam structure mechanically reinforced by a supporting fabric. CONSTITUTION: The objective air-permeable and impenetrable insert excellent in wearing resistance caused by wearing and rubbing resistance comprises, for example, a fine porous polymer layer 1 obtained by drying a polymer foam layer comprising a mixture of a polymer and water reinforced by a supporting fabric 2 comprising knitted or woven fabric having 10-80g/m<2> weight and communicating holes, and pressing the polymer foam layer 1 at a normal temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an inserter intended for use in the clothing industry.
(insert).

Fabric products used in the clothing industry and the processes for manufacturing them are constantly evolving. Particularly over the last few years, semi-permeable products have been developed which are impermeable to water but permeable to carbon dioxide and water vapor. These are classified as breathable. This product protects the user from the elements, yet remains completely comfortable to wear.

For this purpose, products are known in which a layer or semi-permeable film is applied directly to the fabric.

Other products in which the insert constitutes a semi-permeable barrier are also known. The insert is assembled, most often made by gluing a semi-permeable film to a fabric support.

All of these techniques are relatively limited and the presence of semi-permeable layers makes it difficult to control the look, feel and drape of the fabric.

Moreover, semi-permeable films have mechanical properties (stretchability, tensile and tear resistance due to temperature or maintenance) that are different from those of the support fabric to which they are normally applied. This difference directly affects the interface between the support fabric and the film in movement and leads to early concentrated tearing of the lamination, causing complete delamination.

To eliminate this defect, it is contemplated to use microporous polymeric films or layers directly to create the insert. Nevertheless, this film or layer does not have sufficient mechanical resistance and all attempts under this heading have been abandoned for the time being.

The object of the present invention is to be able to produce fabrics free from these defects, with adjustable properties that are pleasing to the eye and to the touch, and which meet the requirements for the use of fabrics in the clothing industry, namely sufficient mechanical resistance. resistance to dry cleaning and washing;
Another object of the present invention is to provide an insert that satisfies both the abrasion and kneading resistance that occur when cloth is worn.

The present invention therefore relates to a breathable and impermeable insert intended for use in the clothing industry which is free from microporous layers. The microporous layer has a stable form.
e foam) and the core layer is reinforced by a support fabric.

The present invention will be explained in detail below with reference to the accompanying drawings.

〔Example〕

The invention therefore relates to a breathable and impermeable insert for use in the clothing industry.

Inserts are commonly used by inserting them inside between fabrics so that the quality and properties of the fabric itself can be altered. These are usually placed between the fabric and the lining.

The insert is bonded within a flounce, where it is surrounded by fabric or lining to give three-dimensionality to the flounce. The insert also does not stick to the fabric or lining. In this case, adhesion at multiple points is preferred as it gives the fabric a supple and pleasant feel.

The insert according to the invention consists of a microporous polymer layer 1. This polymer has a stable foam.
and this layer is mechanically reinforced by a support fabric.

The foam used is stable and remains in this form during its operation, but leads to the formation of a microporous layer at the same time as it supplies the constituents of the manufacturing process and after drying.

Preferably, the foam is a polyurethane foam obtained by stirring a mixture of equal parts of polymer and water. Such polymers are Chemische Fafr+kTu
binger R, sold by the company RoBeitlich GmbH under the name "TtlBIC"[lATMP". This foam layer is usually mechanically reinforced by a fully permeable support fabric 2. Therefore, the support fabric 2 is selected It is possible to adjust the resistance of the insert to pulling and tearing by, for example:
A supporting fabric 2 with the same type of elasticity is used to reinforce the microporous polymer layer 1 when elasticity in the weft direction is required.

The support fabric 2 has a weight of, for example, 10 to 50 g/m'', preferably 2
It has a low weight of 0-80 g/m'. Inserts made in this way also have good mechanical resistance without increasing their weight too much.

The support fabric 2 may also be non-woven, woven or knitted. Preferably, the fabric is perforated to facilitate and allow penetration of the form during manufacture.

The supporting fabric can be a flat knitted fabric as shown in FIG. 1 or 2.

In a preferred embodiment of the invention, two microporous polymer layers 1 in the form of a foam are applied to each side of the support fabric 2, thus leading to complete insertion of the support fabric 2 into the polymer foam.

The support fabric 2 can also include several components so as to impart to the insert not only elastic properties, but also a certain amount of resilience, for example in the weft direction.

The properties of the support fabric 2 also define the garment properties of the insert. It is also possible to limit the penetration of the foam into the support fabric in such a way that one side of the fabric remains S (intact). Scraping or polishing the intact surface gives the insert a cloth feel and increases its resistance to abrasion.

Furthermore, the weight and density of the foam used allows variations in the impermeability and breathability qualities of the insert. To make a heat-adhesive insert, a heat-sensitive adhesive, for example distributed in spots, is applied to one or the other side of the insert.

In order to maintain the properties of the insert (breathability), the heat-sensitive adhesive layer is discontinuous and sprinkled. Polymers currently used as adhesives in the textile industry can be used here, these being thermoplastics or thermosets (polyethylene, polyester, polyamide, polyurethane...).

To manufacture inserts according to the invention, a stable foam is first constructed from a mixture of polymer and water. The layer of polymer foam is then applied to the support fabric 2. The polymeric foam layer is dried and the resulting product is finally cold calendered to flatten the structure of the foam to enhance its adhesion to the support fabric and increase the composite's resistance to abrasion. Passed to 3.

The stable polymer foam can be applied either directly onto the fabric or onto a continuous non-adhesive support 4 and by connecting the support to the support fabric 2.
Contact with or conducted at.

If the application is carried out directly, the support fabric 2 is supported on a continuous non-stick support 4.

The continuous support is an endless conveyor belt circulating at constant speed around rollers 8.9.

This application is carried out using known methods such as application on a rotating frame or stripping with a knife. For example, a rotating frame 5 with a foam scraper is used. This technique allows application of various foam thicknesses by adjusting the spacing between the knife and the support depending on the target foam. In a first embodiment of the invention, the polymer foam is spread directly onto the support fabric 2.

Therefore, the set of components is such that the first drying stage is approximately 100°C.
and then passed through one or more ovens 6.7 such that a second drying step is carried out at a temperature in the range of 120°C to 130°C to solidify the foam configuration. The microporous structure is then dried and stabilized. As mentioned above, the composite is then passed through a cold calendar 3.

The pressure exerted on the calender makes it possible to limit the degree of penetration of the support fabric 2 into the polymer foam.

Calendering is used to apply pressure to the composite and is used to cause the foam layer to penetrate into the support fabric 2. This action is also performed by pressing.

In another embodiment of the method, a stable layer of polymeric foam is made on a non-stick conveyor belt 4 and the support fabric 2 is calendered onto the foam layer.

This calendering is carried out either before drying is carried out, or else after a first drying step at 100° C. has been carried out, again in the wet stable foam state. In this last implementation of the method represented in FIG. 5, the microporous layer l is 100
The supporting fabric 2 is contacted between an oven 6 at 130°C and an oven 7 at 130°C.

In another implementation of the method, two foam layers (2a and 2b
) are each placed simultaneously on one side of the support fabric 2 by means of a double rotating frame (5a and 5b) equipped with a foam scraper.

The support is then completely embedded within the foam. Some applications require inserts with fire-retardant properties.

This can be obtained by selecting each of the compounds. The support fabric is then fire resistant and a fire resistant additive is impregnated into the foam layer.

The hydrophobic properties of the inserts are improved by passing the composite set through a waterproofing solution before pressing.

The polymer foam has a density of approximately 200 g/It and application of 50 to 100 g of foam per square meter (m5) of product produces layers with a thickness ranging from 0.5 mm to 1 mm.

The use of the supporting fabric 2 consisting of a knitted fabric with 30% elasticity in the weft direction and inserting weft yarns based on polyester having a weight of 40 g/m'' makes it possible to obtain inserts with elasticity in the weft direction. I can do it.

Coating can be carried out using a 14 mesh rotating frame with a 40% coating rate of 200 g/1 stable foam.

When assembling the process, the support fabric 2 is initially supported on a non-stick conveyor belt. An insert having a dry weight of 90 g/m'' and exhibiting the required semi-permeability is thus obtained. Drying is carried out at 100 to 130 °C.
This will be carried out in the following stages.

The insert thus obtained has an impermeability of more than 1000 nm of water, complete impermeability of wind and a resistance to water vapor of 60 to 80 mbar/m”/w. It has an elasticity of 25-30%.

[Brief explanation of drawings]

1 is a sectional view of an insert according to the invention, FIG. 2 is a plan view of the insert, and FIG. 3 is a schematic diagram of a system for carrying out the method of the invention according to a first embodiment of the method. FIG. 4 is a schematic diagram of a system for implementing the method of the present invention according to a second embodiment of the method, and FIG.
FIG. 6 is a schematic diagram of a system implementing the method of the present invention according to an embodiment; FIG. 6 is a schematic diagram of a system implementing the method of the present invention using a two-layer foam; l... Microporous polymer layer, 2... Support fabric, 3...
Room temperature calendar, 4... Support (conveyor belt), 5.5a, 5b... Rotating frame, 6.7... Oven, 8.9... Roller. FIG, 1 FIG, 2 I03 6

Claims (1)

Claims: 1. A microporous polymer layer (1), the microporous layer (1) being in the form of a stable foam, the layer being mechanically reinforced by a supporting fabric (2). A breathable and impermeable insert for use in the garment industry. 2. The support fabric (2) has a low weight, for example 10 to 80 g/m
2. The insert of claim 1, wherein the insert is within the range of ^2. 3. The supporting fabric (2) is a knitted or woven fabric with a perforated structure;
The insert according to claim 1 or 2. 4. Insert according to any one of claims 1 to 3, wherein each of the two microporous polymer layers (1) in the form of a foam is placed on one side of the support fabric (2). 5. An insert according to any one of claims 1 to 4 coated with a discontinuous thermoadhesive layer. 6. Insert according to any one of claims 1 to 5, wherein the polymer contained in the foam is polyurethane, and the foam is made from a mixture of polyurethane and water. 7. Since the stable foam is made from a mixture of polymer and water, the layer of polymer foam is contacted with the support fabric (2), the layer of polymer foam is dried and the resulting composite is compressed at room temperature. A method for manufacturing an insert for use in the clothing industry comprising a microporous polymer layer (1). 8. Process according to claim 7, characterized in that the polymeric foam is deposited directly onto the support fabric (2). 9. Polymer foam is used on a non-stick conveyor belt (4
) is applied to form a layer on the supporting fabric (2
) is brought into contact with the foam layer by calendering,
The manufacturing method according to claim 7. 10. Process according to claim 9, characterized in that the foam layer is partially dried before being contacted with the support fabric (2). 11. Process according to any one of claims 7 to 10, characterized in that the support fabric (2) is contacted simultaneously with two layers of polymer foam and each layer with one of the fabric surfaces.