Valve gate assembly

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/18 (2006.01) B29C 45/28 (2006.01) B29C 45/30 (2006.01) B29C 45/58 (2006.01) F16K 3/30 (2006.01)

Patent

CA 2244762

A valve gate assembly including a movable valve stem for guiding molten resin to a molding area, a nozzle body portion enclosing the valve stem and a mold cavity for receiving molten plastic to form a molded part formed between cooperating first and second mold halves. An injection orifice is provided downstream of the valve stem communicating with the mold cavity for transfer of the molten plastic to the mold cavity, and a movable core pin is provided contacting the valve stem and movable between a forward position opening the injection orifice and a rearward position closing the injection orifice.

L'invention concerne un obturateur de vanne comprenant une tige de vanne mobile servant à guider la résine en fusion vers une zone de moulage, un ajutage enfermant la tige de vanne et une cavité de moule destinée à recevoir la matière plastique fondue pour former une pièce moulée entre le premier et le deuxième demi-moules en contact. Un orifice d'injection est prévu en aval de la tige et communique avec la cavité du moule pour transférer la matière plastique en fusion vers la cavité du moule. Une broche mobile, en contact avec la tige, peut se déplacer entre une position d'avance pour ouvrir l'orifice d'injection et une position de recul pour fermer l'orifice d'injection.

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