| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an injection-molded product being a cylindrical body, especially a cylindrical body of which the axial length is larger than its outer diameter with high precision and high efficiency. SOLUTION: In the manufacturing method of the injection-molded product being the cylindrical body, a core pin 23 constituted so as to heat the predetermined length part including at least the position most spaced apart from a gate 15 of the part corresponding to the inside of the cylindrical body in a product cavity 11 is arranged to the part corresponding to the inside of the cylindrical body and, after a molten resin is injected in the product cavity 11 through the gate 15 in a state that the core pin 23 is heated, it is compressed and dwelled in the state that the core pin 23 is heated and, after the heating state of the core pin 23 is cancelled, the molten resin is cooled and solidified. COPYRIGHT: (C)2006,JPO&NCIPI
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