| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a transmission belt in which a tubular molded article having no weld line wherein a short fiber is oriented to the peripheral direction is prepared by extrusion, this article is cut into a wide sheet and then the wide sheet is applyed to a pressed rubber sheet. SOLUTION: The method for manufacturing a transmission belt comprises the following processes: (1) a rubber 15 containing a short fiber is kneaded by an extruding screw and moved without preventing the fluidization and without changing the flowing direction to pass through a rubber path way 18 in a circular expansion die 5, whereby a tubular molded article 10 having no weld line wherein a short fiber is oriented to the peripheral direction is molded by extrusion, (2) the tubular molded article 10 is cut open along the extrusion direction to form a rubber sheet 22 wherein the short fiber is oriented in a width direction, and this rubber sheet 22 is cut along the longitudinal direction by a predetermined length to form a pressed rubber sheet 54 and (3) a molded belt 55 is manufactured in a mold 50, after vulcanization and grinding, to finish a belt sleeve having rib parts. COPYRIGHT: (C)2004,JPO&NCIPI |
