MULTILAYER INJECTION MOLDING APPARATUS, AND METHOD FOR PRODUCING LAMINATED RESIN MOLDED PRODUCT USING SAID MULTILAYER INJECTION MOLDING APPARATUS

摘要

This invention provides a multilayer injection molding apparatus for molding and laminating an additional layer on one layer only in its partial area, and a method for producing a laminated resin molded product using the multilayer injection molding apparatus. The multilayer injection molding apparatus is characterized in that the apparatus comprises a weir part molding region (304) for molding a flat upright face (29), which is parallel to the direction of reduction/enlargement of the volume of the cavity (300), provided on at least one site in a cavity (300) and that, in one of a plurality of injection apparatuses (231, 232), upon filling of the whole region of the cavity (300) with a thermoplastic resin followed by the enlargement of the volume of the cavity (300) to form an additional cavity, the filled resin present in the weir part molding region (304) divides the additional cavity into a plurality of spaces (400, 410), and a flow passage in communication with one of the plurality of injection apparatus is provided in each of the plurality of spaces (400, 410).