PROCESSING OF CANVAS FOR BELT

PURPOSE:To improve the mechanical properties, heat resistance and adhesion by coating canvas for a belt with an RFL(resolsin-formalin-latex) composition of which an L(latex) component includes H-NBR (acrylonitrile-butadiene rubber hydride), and specifying an R/F mole ratio of the RFL composition and a weight ratio of RF/L solid content respectively. CONSTITUTION:An RFL composition is regulated by adding an L(latex) component including H-NBR (acrylonitrile-butadiene rubber hydride) to an RF (resorcin-formalin condensate) liquid prepared in advance. It is preferable that an R/F mole ratio is 1:1-5 and weight ratio of an RF/L solid content is 1:4-20 respectively and pH concentration of the RFL composition is regulated to approximate 10-11. A dipping process is applied to base cloth made of nylon-6 or nylon-66 or the like by using this composition while the quantity to be stuck is controlled by a solid content ratio of an RFL- processing liquid and a clearance amount of drawing rolls in the dipping process so as to keep at 10 to 50weight% to the base cloth, and the base cloth is dried at approximate 110 deg.C and further heat-treated at approximate 220 deg.C to obtain a canvas 14. As a result, mechanical property, heat-resisting property of the canvas 14 and adhesive property between the canvas and the acrylonitrile-butadiene rubber hydride which are the weakest points for the canvas are improved.