Product having injection molded portion, method of manufacturing the product, and apparatus for manufacturing the product
A technology of injection molding and manufacturing methods, applied to the field of molded products with injection molding parts and their manufacturing and manufacturing equipment, can solve problems such as damage to decoration, and achieve the effect of preventing viscosity increase and temperature drop
Inactive Publication Date: 2013-03-27
TOKAI KOGYO CO LTD
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Problems solved by technology
Furthermore, when the above-mentioned cracks occur on the part that can be seen, it will also significantly impair the decoration (for example, the appearance)
Method used
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[0080] Preferred embodiments of the present invention will be described below. Furthermore, matters necessary for the implementation of the present invention other than the matters particularly mentioned in this specification can be fully understood as design matters by those skilled in the art based on the prior art. The present invention can be implemented based on the matters disclosed in this specification and drawings and common technical knowledge in the relevant field.
[0081] The "molded product having an injection-molded part" produced by the production method disclosed here includes a molded material previously formed by extrusion molding or the like and an injection-molded part joined to its end surface (exposed surface), and according to the configuration of the molded product, Molded products of various shapes depending on the location or purpose. Such molded articles include, for example, automotive exterior parts called roof moldings, weather strips, window gl...
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A molded product includes an already-formed member and an injection molded portion. The already-formed member, which has a joining surface, is placed in an injection molding mold, and the joining surface and the injection molding mold define a molding cavity. The injection molding mold further defines a spill cavity that is in communication with the molding cavity. Liquid molding material is injected into the molding cavity. At least some of initial molding material which has initially reached the joining surface flows into the spill cavity due to injection pressure of subsequent molding material injected after injection of the initial molding material, and is replaced with the subsequent molding material, which has a temperature higher than that of the initial molding material and a viscosity lower than that of the initial molding material. When the liquid molding material hardens to form an injection molded portion joined to the joining surface of the first already-formed member, the first already-formed member and the injection molded portion are a joined molded product.
Description
technical field [0001] The present invention relates to some molded articles having injection molded parts and a method for producing the same. Furthermore, the present invention relates to an injection molding die used in the above-mentioned manufacturing method, and a manufacturing apparatus including the molding die. Background technique [0002] As automotive exterior parts, long molded products with various cross-sectional shapes, such as roof moldings, weather strips, and window glass run channels, are used. As a kind of such elongated molded article, can enumerate the molded part that comprises thermoplastic polymer molding material such as thermoplastic resin material or thermoplastic elastomer material by extrusion molding etc. A molded product of an injection molded part that is molded and joined to a part of the molded part in the longitudinal direction. As a method for producing such a molded product partially having an injection-molded portion, the method disc...
Claims
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IPC IPC(8): B29C45/00B29C45/26B29C45/03B60R13/04B60R13/06B60J10/02B29C45/14
CPCB29C45/14311B29C45/14409B29C45/14778B29K2221/003B29C45/2669B29K2621/00Y10T428/31
Inventor 田村达也
Owner TOKAI KOGYO CO LTD