| 摘要 |
PURPOSE:To stir the injected molten resin and to prevent the occurrence of jetting, by forming a cavity at the forward part of the injection direction on the side crossing the side where the molten resin is injected. CONSTITUTION:In a metal mold 17, a pin 18, whose top part is projected in a cavity 12, is set above a core-rod 11 and an injection nozzle 19 is formed at the inner surface of a top force 9 perpendicularly above the top part of the pin 18. When a molten resin is injected from the injection nozzle 19, the molten resin thereby hits the top part of the pin 18, thereafter flows in the cavity 12 and fills there. As the molten resin injected from the injection nozzle 19 is stirred by the top part of the pin 18 forming a cavity 16 and flows in the cavity 12 when the molten resin is injected and fills the cavity 12, the bad patterns such as jetting and so on do not occur and the products of good quality can be prepd. |
