| 摘要 |
PURPOSE:To prevent the backflow of molten resin to a pressure fluid conduit, and positively inject fluid under pressure into molten resin. CONSTITUTION:In the proximity of an opening at the side of a mold space 1 within a pressure fluid conduit 2, a core 3 is so arranged that a space is remained therearound in a manner permitting fluid under pressure to flow, but not permitting molten resin to invade therein and, when the fluid under pressure is injected, the core 3 is forcibly forwarded by the injection pressure in order to project the tip end of the core 3 into the mold space 1. Accordingly, by the space backflow of the molten resin to the pressure fluid conduit 2 is prevented and, further, along the tip end of the core 3 projected at the time of injection f the fluid under pressure, the fluid under pressure is conducted, whereby the fluid under pressure is injected positively into the central part of the molten resin. |
