| 摘要 |
An injection mold apparatus (10) having stationary and movable molding halves (15, 17). One ore more gas poppet valves (28) are affixed in the movable (17) and/or in the stationary (15) halves. The poppet valves (28) are located to open into a cavity (23) between the movable mold half (17) and the stationary mold half (15) when the mold halves are closed. At least one gas line is connected to the valves (28) and to a gas pressure source adapted to open the valves (28) following the injection of molten plastic into the closed mold halves (15, 17). Porous metal covers (72) may be used as an alternative to the valves (28), where gas pressure through the covers (72) can be used to carry out the molding operation. An injection molding method is also taught using injection of gas into the mold halves immediately following injection of the liquid plastic (49). |
