Wall-Covering Elements

摘要

1,162,161. Moulding building elements; laminated products. DUNLOP CO. Ltd. 21 July, 1967 [21 July, 1966], No. 32709/66. Headings B5A and B5N. [Also in Divisions B6 and C3] A wall-covering element core is made by mixing a particulate filler material with a finely divided thermosettable resinous binder heating a layer of the mixture to melt the resin without substantial curing, so that the particles mutually adhere, and cooling; a facing and a backing layer comprising fibrous material and a resinous binder are then applied to the core, and the assembly heated under pressure to consolidate it and to thermoset the binders. The facing layer also covers the sides of the core. The filler forms at least 65% wt., and may form 97À5% wt., of the core. The core binder may be partially cured before facing and backing. The core resin may be phenol-formaldehyde, or urea-formaldehyde, epoxy, or polyester resin. The core particles may be sand, blast-furnace slag, granite, limestone, or pumice, preferably passing 30 mesh B.S. sieve. The facing and backing layer resin may be thermosetting or cross-linkable, coloured or clear, e.g. melamine, urea-formaldehyde, epoxy, polyester or polyurethane. The heating may be performed by means of steam which may be superheated, e.g. to 130‹ C. The fibrous material of the facing and backing layers may be a woven or non-woven fabric, e.g. paper or cloth, embossed or flat, which may have a printed or woven design. The layer resin may be 20-500 wt. per cent based on the fibrous material. A transparent overlay of resin-impregnated paper may be applied over the facing layer.