| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method, which is excellent in productivity, with which the usage of one extruder is enough and consequently which is very profitable from the standpoints of cost and space by a method wherein a synthetic resin tubular body, in which reinforcing material is nearly uniformly orientated to the peripheral direction of the tubular body and consequently which is excellent in strength and rigidity due to the efficiently and peripherally reinforced by the reinforcing material, is continuously manufactured by one process with one extruder. SOLUTION: Mixture including reinforcing material and thermoplastic is molded with an extruder A having a screw 1 built-in its and passed through a flow path 10 made between a tubular part for an outer mold 4a formed by extending the tip part of an outer cylinder 4 and a drivingly rotating molding core part 2, which is formed by extending the tip part of the screw and synchronously rotated with the screw 1, so as to be applied shearing force from the molding core part 2 to the rotating direction during the passing of the mixture through the flow path in order to form the mixture into a tubular body. Further, after being passed through a flow path portion corresponding to a non-drivingly rotating molding core part 3 extendingly provided on the downstream side to the extrusion direction of the extruder, the mixture is extruded through the outlet of the flow path. |
