Abstract: A multi-filament yarn is subjected to soft twist of 4 to 9 twistings in every 10 cm in a single direction thereby forming a warp yarn. Weft yarns are passed, at a density of 1 to 3 yarns in every 5 cm, crosswise over and under a plurality of the warp yarns parallel-arranged in a set width, thereby forming a cord fabric. The cord fabric is subjected to adhesion treatment with an adhesive so that an adhesive content per unit area thereof reaches 2 to 5%, is subjected to heat treatment so that the warp yarns reaches 1 to 4% in heat shrinkage percentage and is then cut at set lengths thereby obtaining short fibers.

Abstract: A canvas-rubber complex provided on an upper face of a tension rubber on a back side of V-ribbed belt is composed of a covering canvas, impregnation rubber with which the covering canvas is impregnated, an outer rubber layer which is applied to a first face of the covering canvas which is located on the back face's side of the belt, an inner rubber layer which is applied to a second face of the covering canvas which is the back of the first face, and an adhesion rubber layer disposed on a side of the inner rubber layer for adhering the canvas-rubber complex to the upper face of the tension rubber. Among the rubber elements excepting the adhesion rubber layer, at least the outer rubber layer is formed of a rubber composition including as main ingredients thereof CR polymer, hard carbon and conductive carbon.

Abstract: A belt which prevents generation of cracks and noises at a joint part of a canvas. Tooth faces of tooth parts of a synchronous belt are covered with the canvas. A warp yarn of the canvas is such formed that a necessary number of spun yarns or filament yarns are gathered and given a final twist at many twisting times of 1000-3000 per meter. The warp yarns of the canvas is so composed that a first pair of warp yarns made of an S twist yarn and a Z twist yarn and a second pair of warp yarns made of a Z twist yarn and an S twist yarn are arranged alternately in a belt-width direction. A weft yarn of the canvas is composed of well known spun yarns or filament yarns. The canvas is woven by the warp yarns and the weft yarns and shrunk in hot water so as to stretch in a belt-length direction.