| 摘要 |
<p>PURPOSE:To obtain a high-quality rubber extruded product with no defect such a air bubble at all by vulcanizing under normal pressures by a method wherein rubbers are extruded under a pressure higher than the specified value and, after that, vulcanized under normal pressures. CONSTITUTION:A reinforcing layer 4, which has an overlapped portion 3 continu ously running in the longitudinal direction of a hose,is arranged by coextrusion between an inner layer rubber 1 and an outer layer rubber 2 with two extruders respectively extruding the inner layer rubber 1 and the outer layer rubber 2 and with a cloth head introducing band-shaped fabric in conjunction with the extruders. Rubbers are extruded under a pressure of 150kgf/cm<2> or higher and after that vulcanized under normal pressures. The pressure of 150kgf/cm<2> or higher to be applied to the rubber during extrusion is basically produced by giving resistance to the flow of rubber; or by various methods such as by mak ing the parallel portion of a die (nozzle) longer with the thicker die; by making the rubber channel narrower with a crosshead; by making the cross-sectional area of the rubber channel smaller ahead of the die or the like.</p> |
