| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molded form having a configuration capable of providing a sink mark at a place whereat the sink mark is required and transferring mirror surfaces surely at places whereat the transfer of mirror surfaces is required, in molding the injection molded form by employing an injection molding tool. SOLUTION: An injection molded form 1 is molded by an injection molding tool 10 constituted so as to generate a pressure difference or an air pressure between a mirror surface part, corresponding to the mirror surface of a molding material 20 and a venting port unit, corresponding to the venting port 18 of the same, to generate a sink mark in the venting port part. In such an injection molded form 1, steps 6 are provided between the venting port 18 and the mirror surface parts 2, 3 in the cavity 17 of the injection molding tool 10. Concretely, the steps 6, intercepting between the venting port 18 and the mirror surfaces 2, 3, are provided on a surface 4 at the venting port side of the injection molding molded form 1 whereby the area of sink mark ca be controlled so as to be in the steps and the arrival of sink mark at the mirror surfaces 2, 3 can be prevented. |
