Injection molding method and injection molding machine

Details Injection molding method and injection molding machine Injection molding method and injection molding machine

B - Operations, Transporting

29

C

B29C 45/34 (2006.01) B29C 45/03 (2006.01) B29C 45/17 (2006.01)

Patent

CA 2742230

It may be possible to suppress the clogging of a gas vent, to simplify the maintenance of a mold device, and to improve the preform productivity. The invention may be applied to an injection molding machine including a split mold where a gas discharge portion is formed at parting surfaces. Further, the cross-section of a flow passage of the gas discharge portion is reduced at a predetermined timing after the start of the filling of a molding material. Since the cross-section of the flow passage of the gas discharge portion is reduced after a cavity space starts being filled with a molding material, it may be possible to make the amount of gas, which flows through the gas discharge portion, large until the cross-section of the flow passage of the gas discharge portion is reduced. It may be possible to prevent a foreign material from adhering to the inner peripheral surface of the gas discharge portion.

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