| 摘要 |
PROBLEM TO BE SOLVED: To produce a completed product in a single stage by using a single apparatus without requiring an additional processing stage while forming a joint rapidly. SOLUTION: A first structure 31 made of a plastic material and second structures 32a, 32b made of a plastic material are mutually fixed by a joint forming device forming joints 33 at desired positions. The first structure 31 is formed into a ring shape to be arranged between films 32a, 32b forming the second structures and, at a time of the formation of joints, at least four material layers are arranged in a mutually superposed state. The outer surface of the first structure 31 is fixed to the inner surfaces of the second structures 32a, 32b by forming the joints but, by forming the joints from desired positions so that the inner surface of the first structure 31 is not mutually fixed by the formation of the joints, the first structure 31 is fixed to the second structures 32a, 32b by the joints 33. |
