DE20105452U1 - Woven or knitted fabric with a foamed plastic layer on the back - Google Patents

Description

Woven or knitted fabric with a foamed plastic layer on its back .

The invention relates to a woven or knitted fabric made from yarns, as is used for example for the manufacture of upholstery covers, luggage, sportswear and the like, with a foamed plastic layer on the back side opposite the top side. The invention preferably relates to a woven or knitted fabric, i.e. a textile material with a surface weight of more than 220 g/m², as is used for sports and protective clothing. This material can consist of natural and/or synthetic fibers.

It is known to laminate a textile material with an open-cell polyurethane foam on its back. These light open-cell polyurethane foams are cut out of blocks by splitting or peeling and bonded to the back of the textile material using an adhesive or by so-called flame lamination. Due to their low density, but above all due to their open cell structure, the laminated PUR foam loses its cold-insulating properties when subjected to pressure, because the back of the foam compresses completely or almost completely at a load of less than 1 kg / cm2.

The laminated foam also tends to delaminate and causes an unpleasant build-up of heat in the non-compressed areas when used as a clothing or upholstery material.

The open-cell foam, which is usually between 1 and 5 mm thick, also has the disadvantage that it absorbs moisture. This means that if, for example, rainwater penetrates the textile material from the outside, the water is deposited on the inside due to the foam's spongy effect. This means that the lining material or other materials worn on the body also become damp or wet.

The textile material with the PUR foam is permeable to water vapor and air, but it does not represent a barrier against water from the outside to the inside. This is particularly unpleasant when, for example, when exercising, increased body moisture and heat occur and must be dissipated. Due to the open-cell structure and the associated sponge effect, the back of the wet foam feels just as wet as the outside of the fabric. It is particularly disadvantageous when the outside of the fabric gets wet from rain, because then the moisture also penetrates through

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Pressure loading and pressure relief and the resulting negative pressure are literally sucked in by the foam.

The invention is based on the object of creating a woven or knitted fabric with a foamed plastic layer on its back, which does not have these disadvantages.
The solution to the problem posed corresponds to the characterized part of claim 1.
The cells containing gas under excess pressure are pressure-stable and pressure-elastic; in order to compress them by 50%, a pressure of more than 4.0 kg/cm2 is required, i.e. a pressure that hardly ever occurs in practice.

The solidified plastic dispersion with its open cells (6), which connects the closed shells (4) to one another and to the layer (1), is an additional stabilizing factor which prevents the gas (5) from escaping under dynamic loads and also at elevated temperatures. Due to the gas present under excess pressure, the layer (2) absorbs only a small amount of moisture, so it feels dry, and the open cells (6) between the shells (4) provide water vapor permeability and air permeability, which enables the body moisture to be transported away from the inside to the outside and makes it difficult or impossible for water to pass through from the outside to the inside. Because the closed cells have different sizes of 10-80 μηη, the pressure stability of the layer (2) is also increased and the conditions for fine open cells located between the closed ones are improved.
Since the heavy gas present in the overpressure, which preferably consists of isobutane, cannot escape, the pressure-stable but still very flexible layer (2) can be very thin. According to the invention, this layer has a thickness of between 0.05 and 0.8 mm, preferably between 0.1 and 0.2 mm. Since the layer (2) was applied to the layer (1) starting from a liquid or pasty plastic dispersion and bonded to it, an inseparable bond is ensured. According to the invention, the layer (2) easily penetrates between the cavities of the woven or knitted structure and partially fills them when viewed from the back. This also improves the adhesion between the layers.

When measuring the thickness of layer (2), the areas which have penetrated layer (1) are not taken into account.

The layer (2) can have any structure on its outside or be lightly ground. According to the invention, it is advantageous if the layer (2) and the layer (1) are the same color because then the material at the cut edge appears as if it were a single layer.

Any fibres from layer (1) that penetrate or penetrate layer (2) are not taken into account when assessing the thickness. To determine the thickness of layer (2), it is separated mechanically, e.g. using a razor or blade, from the woven or knitted fabric (1), freed of fibres and then measured using a thickness gauge with a contact pressure of 1 kg/cm at + 22 ⁰ C.

The permanently present gas volume, even under pressure, enables excellent cold and heat insulating properties. Due to these properties, the textile material according to the invention is particularly suitable for winter sports clothing, hunting clothing, motorcycle clothing and so-called outdoor clothing, work protection and safety clothing as well as for upholstery and vehicle interiors.
The solidified dispersion plastic, which connects the shells of the closed cells to each other and to the carrier, has a different composition than the thermoplastic plastic which envelops the gas. The solidified dispersion plastic preferably has elastomeric properties.

The layer (2) according to the invention has a significantly better hydrolysis resistance than polyurethane foams with only open cells due to the closed cells. The woven or knitted fabric (1), which is made from yarns, has a wicking effect due to the many fibers that make up the yarn, which also holds back the water. The layer (2) with its closed cells behaves more like a woven, knitted or fleece that was made from a monofilament and therefore has little or no wicking effect, does not retain moisture and dries quickly.

Regardless of whether water is applied from the back of layer (2) and migrates into the woven or knitted layer (1) or whether water migrates from the top of the woven or knitted layer (1) into layer (2), the top of layer (2) always feels drier and warmer than the top of the woven or knitted layer (1).

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Claims (3)

1. A woven or knitted fabric ( 1 ) made from yarns with a weight per unit area of more than 220 g/m² and with a foamed plastic coating ( 2 ) connected to it on its back, characterized in that the layer ( 2 ) consists of more than 60% by volume of a heavy gas ( 5 ), preferably isobutane gas, which is enclosed by a thin casing ( 4 ) made of an elastic thermoplastic material, and that the gas ( 5 ) in the casings ( 4 ) has an excess pressure compared to atmospheric pressure, and that the gas-filled casings ( 4 ) which form the closed cells ( 3 ) in the layer ( 2 ) have different diameters, between 10 and 80 µm, and that the outside of the casings ( 4 ) are inseparably connected to one another and to the woven or knitted fabric ( 1 ) by means of a solidified plastic dispersion, and that between the Shells ( 4 ) contain open cells ( 6 ). 2. According to claim 1, characterized in that the layer ( 1 ) and the layer ( 2 ) are the same color. 3. According to claims 1 and 2, characterized in that the layer ( 2 ) has a thickness between 0.05 and 0.8 mm, preferably between 0.1 and 0.2 mm.