Method and apparatus for venting entrapped air in mold cavities

Details Method and apparatus for venting entrapped air in mold cavities Method and apparatus for venting entrapped air in mold cavities

B - Operations, Transporting

29

C

18/708

B29C 45/73 (2006.01) B29C 45/34 (2006.01)

Patent

CA 1106565

Abstract of the Disclosure A method and apparatus for molding a plastic article comprising the steps of providing a mold die having a closed cavity shaped substantially like the article and having an inlet to said cavity and for injecting liquid plastic material into the cavity through said inlet in a manner which causes entrapment of the air present in the cavity to be concentrated in an area of the cavity. Liquid coolant is passed through the mold adjacent the mold cavity while the area of the cavity having the entrapped air is vented to the liquid coolant and the pressure of the flowing coolant, at least where the entrapped air is vented, is maintained at a pressure that is less than atmospheric pressure.

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