| 摘要 |
The purpose of the present invention is to provide a method for producing a pipe member that enables the thickness of a product to be made as thin as possible without complicating a device, and that enables the required quantity of thermoplastic material to be minimized. In order to achieve this purpose, the present invention provides a method for producing a pipe member which comprises a thermoplastic material filling process in which a mold is filled with a thermoplastic material, and a thermoplastic material discharge process in which portions of the thermoplastic material inside the mold that have not yet solidified are extruded with a pressurized fluid, and is characterized in that: the thermoplastic material is obtained by kneading foaming agents; and a process for causing the thermoplastic material, which is packed into the mold, to foam, is provided, and the thermoplastic material discharge process involves extruding the central portion of the thermoplastic, which is foaming in the mold, with a pressurized fluid before said portions solidify. |
