METHOD FOR INJECTION-MOLDING MULTILAYERED HOLLOW BODY MADE OF SYNTHETIC RESIN

Japanese Patent JP3515563

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PROBLEM TO BE SOLVED: To provide a method for injection-molding a multilayered hollow body made of a synthetic resin, capable of inexpensively molding even a multilayered hollow body uniform in thickness and having a complicated shape.
SOLUTION: A single-layer hollow body (Tab) is molded by primary molding for injection-molding a pair of half hollow bodies using a fixed mold and a slide mold so as to have protruded parts and secondary molding for molding the hollow body from a pair of the half hollow bodies by bonding the protruded parts of a pair of the half hollow bodies obtained by the primary molding. This single-layer hollow body (Tab) is inserted in the recessed parts (31 and 41) formed by a fixed mold (30) and a movable mold (40) and a molten resin is injected in the cavity (Cs) formed by the outer surface of the inserted single- layer hollow body (Tab) and the inner surfaces of the recessed parts (31 and 41) to mold an outer layer (Ss) to obtain the two-layered hollow body (T2). Alternatively, the molding of the outer layer is repeated in the same way to injection-mold the multilayered hollow body having three or four layers.

Nishida, Shozo

JP2002000051276

January 23, 2004

February 27, 2002

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JAPAN STEEL WORKS LTD:THE

B29C45/14; B29C45/00; B29C45/10; B29C45/16; B29L9/00; B29L22/00; B29C45/14; B29C45/00; B29C45/03; B29C45/16; (IPC1-7): B29C45/10; B29C45/14; B29C45/16

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