FI71171C - ELASTIC UTBREDNINGSMATTA FOER EN UTBREDNINGSANORDNING FOER SKNN - Google Patents

Description

1 71171

Elastic application mat for leather applicator. - Elastic utilization of the maturity of the utilization of the skin.

The invention relates to an elastic application mat for a leather application device in the form of an endless mat loop and in which at least two rubber layers are fastened to each other by vulcanization (hot or cold vulcanization).

A continuous leather applicator using such an application mat is disclosed in the applicant's earlier application WO85 / 03309. Stretchable leather strongly resists stretching of stretch mats in the area where the leather is pressed between the stretch mats. As a result, outside said area, i.e. in the edge area of the stretch mats, the mat is exposed to relatively large stretches, with the result that there is a risk of the edges of the stretch mats tearing.

The object of the invention is to provide a spreading mat with which this risk of tearing the edge areas of the mat can be avoided. To achieve this purpose, the spreading mat according to the invention is characterized in that curled or otherwise tortuous fibers are interposed between the rubber layers to prevent the spreading mat from stretching after a certain stretching distance, and in addition to said fibrous layer the mat has longitudinal straight fibers or yarns.

The fibers that allow limited stretching can form a network in which the directions of the fibers are distributed so that said stretch-limiting effect is obtained in all directions of the plane of the mat.

In order to achieve the objects of the invention, said fiber layer with limited elasticity does not necessarily have to extend over the entire width of the mat, since its function is to prevent disproportionate elongation of the areas outside the stretchable leather compared to the area loaded by the stretchable leather. However, this would limit the arrangement of the skins and the minimum size of leather that can be applied by the device, so that most preferably said fibrous layer extends over the entire surface area of the application mat.

In the optimal case, the stretching distance allowed by the fibrous layer is substantially the same as the maximum spreading distance of the leather.

The fibrous layer can be made of single or multi-strand crimped or creped yarns. For example, a mesh braid woven from creped polyamide yarn may be considered. However, it is clear that any synthetic or natural fibers with good tensile strength can be used as the fibers.

In order to be used in the continuous application device according to WO85 / 03309, in addition to the limited stretch layer, the mat must have longitudinal straight fibers or yarns which prevent the mat from stretching in its longitudinal direction, i.e. endlessly in the direction of the continuous mat loop.

The invention will now be illustrated with reference to the accompanying drawings, in which Figure 1 shows a part of a spreading mat according to the invention in section 2 taken along line I-I and Figure 2 shows a cross-section of a corresponding mat in which the cut line of the upper rubber layer 1 is not shown for clarity.

In the example case, a part of an endless carpet loop is shown, in which the endless continuous length of the loop is marked with an arrow A. The longitudinal centerline of the carpet loop is marked with a dotted line B. The carpet is made of two rubber layers 1 and 2 attached to each other. The vulcanization can be hot vulcanization or cold vulcanization with the aid of adhesives. A layer 3 of curled, creped or otherwise tortuous fibers is interposed between the rubber layers 1 and 2, which is characterized in that it prevents the finished mat from stretching after a certain stretching distance. The fibrous layer 3 is preferably made in the form of a mesh braid, whereby a firm adhesion of the rubber layers 1 and 2 through the mesh loops is achieved. It is essential, however, that the yarns of the loops, due to curling, creping, or other similar twisting, stretch a certain distance before they begin to limit the stretching of the rubber mat. This distance is preferably chosen to be the same as the maximum stretching distance of the skins. A suitable material is, for example, creped polyamide yarn. It is clear that any synthetic or natural fibers with sufficient tensile strength are possible.

When the yarn directions of the mesh braid 3 are selected diagonally as shown in Fig. 1, the elongation of the mat and the stretch-limiting effect in all directions of the plane of the mat are obtained. In addition, the longitudinal (direction A) elongation of the carpet loop of the continuous device must be completely prevented in order to ensure the operation of the device according to the principle disclosed in WO85 / 03309. For this purpose, one or more layers of longitudinal (direction A) straight fibers or yarns 4 are arranged inside the second rubber layer 1, which prevent the longitudinal stretching of the mat. The wire layers 4 can also be placed on the rubber layer 1 by making this rubber layer from a plurality of vulcanized rubber layers.

Claims (6)

An elastic application mat for a leather applicator, in the form of an endless mat loop, in which at least two rubber layers (1, 2) are fastened to each other by vulcanization (hot or cold vulcanization), characterized in that curled or otherwise intruded rubber layers are interposed between the rubber layers. fibers (3) which prevent the spreading mat from stretching transversely after a certain stretching distance, and that in addition to said fibrous layer (3) the mat has longitudinal (A) straight fibers or yarns (4) which prevent the mat from stretching in its longitudinal direction. Application mat according to Claim 1, characterized in that the fibrous layer (3) which allows limited stretching extends over the entire surface area of the application mat. Application mat according to Claim 2, characterized in that the stretching distance permitted by the fibrous layer (3) is substantially the same as the maximum application distance of the leather. Spreading mat according to claim 1, 2 or 3, characterized in that the meandering fibers (3) form a network in which the directions of the fibers are distributed so that said stretch-limiting effect is obtained in all directions of the plane of the mat. 4,71171 Spreading mat according to Claim 1 or 4, characterized in that the fibrous layer (3) which allows limited stretching is in the edge areas of the spreading mat, covering at least the edge area which is outside the skin to be stretched. Spreading mat according to one of Claims 1 to 5, characterized in that the fibrous layer (3) is made of single- or multi-strand crimped or creped yarns.