| 摘要 |
PURPOSE:To prevent resin from oxidizing and burning in a high speed injection by sealing inert gas in a mold cavity before injection and then injection molding molten resin. CONSTITUTION:The movable mold 15 is advanced and before touching the fixed mold 16, the cam 12 engages with the limit switch 13 to excite the solenoid 11 of the ON-OFF valve 10 to open said valve 10. Then, the inert gas in the cylinder 7 is released from the surface of the movable mold 15 through the passage 8. The movable mold 15 advances and touches the fixed mold 16 and simultaneously the cam 12 engages with the limit switch 14. The operation of the limit switch 14 makes the solenoid non-magnetic and closes the ON-OFF valve 10. As a result, the release of gas from the cylinder 7 is stopped. Thereafter, the molten resin 17 is injected from the screw cylinder 18 into the mold cavity. |
