| 摘要 |
PROBLEM TO BE SOLVED: To improve the positional precision of the joining parts of molding materials extrusion-molded separately by a method in which a recessed part is formed on one joining surface of the first extrusion molding material and the second extrusion molding material, a projected part is formed on the other joining surface, and these recessed and projected parts are engaged to be fused/ integrated together. SOLUTION: The first extrusion molding material is extrusion-molded, and the second extrusion molding material constituting a hollow seal part 11 is extrusion-molded from the second ectruder 2 at a position corresponding to the apex part 10a of the fitting part 10. A pair of recessed parts 16 whose cross sections are triangular and whose opening surfaces are wider than the bottom surfaces is formed in the apex part 10a of the fitting part 10, and projected parts 17 of triangular cross sections are formed at the foot lower end of the seal part 11. These positoning recessed and projedted parts 16, 17 are molded silultaneously at the extrusion molding of the fitting part 10 and the seal part 11, the recessed and projected parts 16, 17 are engaged with each other and positioned, and both are fused together to be integrated.
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