| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that high gas pressure for breaking the thick skin layer being in contact with a mold is required because the heat energy is deprived from the molten resin in the cavity of the mold by the periphery with the elapse of time in gas injection molding and the skin layer is formed. SOLUTION: The gas injection pin is constituted so that an almost columnar body part and an almost columnar flange part, of which the diameter is larger than that of the body part, are integrally formed in a state that one end of the body part is matched with one end of the flange part, and has a groove, which passes the apex formed by sharpening the other end of the body part and is formed in the diametric direction thereof and has a definite width and depth, and at least one notch arriving at the other end of the flange part from one part of the groove. This gas injection pin is used to inject gas in the molten resin. COPYRIGHT: (C)2005,JPO&NCIPI |
