Turbulent flow gate for the injection molding of tubular...

Details Turbulent flow gate for the injection molding of tubular... Turbulent flow gate for the injection molding of tubular...

B - Operations, Transporting

29

C

18/711

B29C 45/28 (2006.01)

Patent

CA 1272362

Abstract of the Disclosure Injection molding apparatus is disclosed in which weld lines are removed from a part, such as a parison, which weld lines are caused by the interruption or split- ting of the flow of plastic material around core support pins or the like by the provision of an annular mixing chamber which opens into the plastic material flow pas- sage. The plastic material is caused to move radially into the mixing chamber where it is spread by reason of the increasing volume encountered, accompanied by a rever- sal of flow radially inwardly into an annular injection gate. The movement of plastic material within the chamber and the resultant increase in temperature by reason of shear, eliminates the weld lines which have been formed in the material by reason of the splitting of flow around the pins.

545694

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