| 摘要 |
PURPOSE: To provide a high quality molding with an insert core material with high productivity and a beautiful surface embodiment. CONSTITUTION: A core material 2 consists of a rod-like body having a part 2c with a small diameter on its end part and a part 2b with a large diameter on its central part and a ring-like channel 2d on the part 2c with a small diameter and a skin layer 3 is formed over the part 2c with a small diameter and the part 2b with a large diameter. In addition, the peripheral face of the part 2c with a small diameter is made in parallel with the central line of the core material or is made to become gradually smaller diameter toward the end part or is made to become gradually larger diameter toward the end part. |
