摘要 |
PURPOSE:To block a hole generated at a gas exit/ entrance such as a gate, etc., in a gas blowing molding method. CONSTITUTION:A movable pin 5, disposing its tip in a gate 3a and movable in a vertical direction, is disposed in molds 6 a synthetic resin 2 is substantially fully injected in a cavity of the molds 6, and a high pressure inert gas is thereafter blown through a sprue 3 before the resin 2 is entirely solidified. After dwelling, the pin 5 is moved upward to seal up the gate 3a. |