| 摘要 |
PURPOSE:To constitute the above method so that neither an offset in running nor creases are generated by simple structure. CONSTITUTION:A heat-resistant resin pipe 3 which possesses the higher coefficient of thermal expansion than that of a steel pipe 2 and is in a state of a drum is arranged within the steel pipe 2 and at least the resin pipe 3 and a thermoplastic sheet 1 are heated under a state where the thermoplastic 1 molded into a state of an endless belt is arranged on the outer circumference of the resin pipe 3. Then, the thermoplastic sheet 1 is softened and the resin pipe 3 is expanded by this heating and the thermoplastic sheet 1 is pressurized by placing the thermoplastic sheet 1 between the resin pipe 3 and steel pipe 2. Then, the same is cooled, the resin pipe 3 is separated from the steel pipe 2 under a state where the thermoplastic sheet 1 is stuck close to the resin pipe 3 and the thermoplastic sheet 1 is made into a state of almost a drum. |
