| 摘要 |
PURPOSE:To reduce the failure in the braiding process of reinforcing layer and prevent the defective outer diameter from developing and consequently contrive to stabilize the productivity and quality of hose by a method wherein the water content of resin mandrel is pretreated so as to be reduced to the specified value or less by being dried in drying process just before the extrusion of inner tube for recycling the drawn-out resin mandrel. CONSTITUTION:In the manufacture of hose consisting of at least inner tube and reinforcing layer, the inner tube made of the green rubber composition is applied onto the resin mandrel, the saturated water content of which is 2% or higher. In the preceeding process of the application of the inner tube, the water content of the resin mandrel is treated by drying so as to become less than or equal to 1.5%. After that, green rubber composition is extruded. As a result, the failure at the braiding process of the reinforcing layer is reduced and the defective outer diameter is prevented from developing and consequently the stabilization of the productivity and quality of hose is contrived. |
