Metering device for a nozzle of an injection molding apparatus

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/02 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01) B29C 45/30 (2006.01)

Patent

CA 2498897

An injection molding apparatus includes an injection piston (50) that is slidable within a nozzle (18) having a movable valve gate pin (28). The injection piston (50) is movable from a retracted position to an extended position in order to force melt towards a mold cavity (26). A valve (52) is located at a forward end of the piston (50) to selectively block communication between a recess (48), which is provided in an outer wall (51) of the piston (50) adjacent the valve (52), and a melt chamber (54) of the nozzle (18). Movement of the injection piston (50) from the retracted position to the extended position causes the valve (52) to close so that the predetermined volume of melt located below the valve (52) is forced into the mold cavity (26), when the valve gate pin (28) opens the mold gate (24).

Un appareil de moulage par injection comprend un piston d'injection (50) coulissant à l'intérieur d'un ajutage (18) présentant un obturateur mobile (28) de vanne. Le piston d'injection (50) est mobile d'une position rétractée à une position déployée afin de forcer la matière fondue à aller vers une cavité (26) de moule. Une vanne (52) est située au niveau d'une extrémité avant du piston (50) de manière à bloquer sélectivement la communication entre un évidement (48), lequel est ménagé dans une paroi extérieure (51) du piston (50) adjacente à la vanne (52), et une chambre (54) de matière fondue de l'ajutage (18). Le mouvement de piston d'injection (50), depuis la position rétractée jusque dans la position déployée, provoque la fermeture de la vanne (52), de telle sorte que le volume prédéterminé de matière fondue situé au-dessous de la vanne (52) est forcé à passer dans la cavité (26) du moule, lorsqu'un obturateur (28) de vanne ouvre l'obturateur (24) du moule.

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