Press pad made of asbestos-free material

Abstract

This invention pertains to a press pad made of asbestos-free material, e.g., for use in short-cycle and multiplaten presses for coating chip boards or other material.

Description

BACKGROUND INFORMATION[0001] Such press pads are used, in general, in various types of high- and low-pressure presses, e.g., short-cycle or multiplaten presses for coating chip boards with melamine film, high-pressure presses for manufacturing high-pressure laminates and presses for covering various types of support materials with wood veneer or films or other similar presses for surface coating.[0002] It has been known that metal filaments can be woven into a press pad to improve its heat transfer.[0003] Aside from this, usual press pads have as the asbestos-free material a fabric layer made of a textile fabric, whose surface is so rough and irregular that despite the interposition of a pressing plate made of metal, the surface structure may be visible on the laminate manufactured in a disturbing manner, which is felt disturbing if very high requirements are imposed on the uniformity of the surface of the laminate.[0004] To remedy this drawback, press pads have been known with a te...

AI Technical Summary

Benefits of technology

[0007] The basic object of the present invention is therefore to provide a press pad with a mat applied to it, during the manufacture of which the fastening process takes place in a reliable manner, especially without needle breakages and during the use of which no disadvantages arise in terms of a nonuniform heat transfer.

[0009] Besides solving the above-mentioned problem, this fastening technique also has the advantage that the percentage of metal relative to the total weight of the pad may be selected at practically any desired value, so that this fastening technique is also suitable for pads that require a higher percentage of metal.

Problems solved by technology

Aside from this, usual press pads have as the asbestos-free material a fabric layer made of a textile fabric, whose surface is so rough and irregular that despite the interposition of a pressing plate made of metal, the surface structure may be visible on the laminate manufactured in a disturbing manner, which is felt disturbing if very high requirements are imposed on the uniformity of the surface of the laminate.

The drawback of a nonuniform heat transfer due to the nonuniform adhesive layer was feared as well.

On the other hand, it was found in practice that breakage of the needle occurs during the pinning process in various applications, especially when a higher percentage of metal is to be reached in the press pad, which makes it impossible to use percentages of metal in excess of about 70 wt.

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