ENDLESS ABRASIVE BELT,AND LAMINATED PATCH SPLICE THEREFOR

摘要

1492789 Seaming non-metallic sheet material CARBORUNDUM CO 4 Nov 1974 [7 Nov 1973] 47570/74 Heading B5K [Also in Division B3] The complementary abutting juxtaposed ends 14, 15 of flexible sheet material are joined to form an endless belt by a joint at an angle, other than at right angles, to the intended running direction of the belt, by joining a patch 22 over the ends 14, 15, the patch comprising a straight slit woven fabric layer 17 bonded to a plastics film layer 18. The layer 17 may be of nylon, polyester, polybenzimidazole, cotton or a mixture thereof and is from 100-250 microns thick. For a woven aromatic polyamide fabric, thicknesses of 165 and 230 microns are specified and, for a woven polyester fabric, a thickness of 125 microns is specified. The fabric of the layer 17 is cut parallel to the running directions of the yarns thereof. The layer 18 may be of polyimide, polyester, polyethylene or cellulose triacetate and, prior to being joined to the layer 17, is 25-125 microns, preferably 50 microns and 75 microns, thick. The layers 17, 18 may be joined together by heat and presure, Fig. 3, or by an adhesive 21, Fig. 4, e.g. thermosetting or thermoplastic polyurethane adhesive, epoxy adhesive, nylon-epoxy adhesive or nylonphenolic adhesive having a thickness of 10-25 microns. An adhesive layer 20 is provided on the layer 17 to join the patch 22 to the abutting ends 14, 15 and may be the same adhesive as the adhesive 21. The layer 20 has a thickness of 25-175, preferably 50-125, microns. Preferably, the belt is an abrasive belt having abrasive grains 11 affixed to one surface thereof by an adhesive coat 27 and a size adhesive coat 28. The grains 11 may be alumina, an aluminazirconia fused mixture, silicon carbide, diamond, garnet, quartz, vermiculite or flint. The flexible sheet material may be paper, cloth, vulcanized fibre, i.e. a fibrous web impregnated with rubber which is vulcanized, or leather. The belt is formed by cutting the flexible sheet material to the shape of a parallelogram having a base length equal to the desired belt length and a height equal to the desired belt width. The ends are abutted and spliced using the laminated patch.