Husky Injection Molding Systems Limited

Sean Weir

Jan Marius Manda

Pierre Jean Pinet

The present invention relates to a non-return valve that can be configured for use anywhere along a molding material flow path in a molding system. The non-return valve of the present invention includes an improved means to restrict the backflow of melt therethrough during injection. In particular, a spigot-seal is configurable, during injection, between overlapping, closely-spaced, and mutually parallel complementary male and female spigot portions that are configured between complementary valve members. The spigot-seal advantageously maintains an effective backflow restriction even in the eventuality of transient movement between the spigot portions during injection. Preferably, the non-return valve of the present invention is also configured to include a means for mutually aligning and/or guiding the complementary valve components that ensures a proper alignment between the complementary spigot portions, and may also serve to improve the function and longevity of a face-seal, when present. The non-return valve of the present invention provides particularly advantageous utility when configured for use in a barrel assembly of an injection unit for the injection molding of a metal alloy.

Non-return valve for use in a molding system

Disclosed is a device configured for a valve. The valve has a valve structure that is configured to include an outlet body configured to define an outlet. The outlet body is also configured to attach to a melt processing screw of a molding machine. The valve structure is also configured to include an outlet cover configured to selectively close and open the outlet. The device includes a brake configured to decelerate the outlet cover responsive to deceleration of the outlet body, and the decelerating outlet cover maintains the outlet substantially closed.

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Toronto, Canada

Sean Weir