Alternative pressure control for an injection molding apparatus
First Claim
1. A melt pressure regulating mechanism for an injection molding apparatus having a melt holder for pressurizing molten plastic prior to injection into a mold, and an injection element for advancing the molten plastic from the melt holder through a nozzle and into the mold, the melt pressure regulating mechanism comprising:
- a fluid pressure regulating valve having a valve body with a molten plastic inlet and a molten plastic outlet connected by a molten plastic passageway, wherein the fluid pressure regulating valve is configured to control an amount of molten plastic moving through the molten plastic passageway such that the molten plastic that is downstream from the fluid pressure regulating valve is maintained at a substantially constant pressure; and
a pressure relief valve oriented in series with the fluid pressure regulating valve.
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Accused Products
Abstract
A melt pressure regulating mechanism for an injection molding apparatus having a melt holder for pressurizing molten plastic prior to injection into a mold, the molten plastic having a melt pressure, and an injection element for advancing the molten plastic from the melt holder through a nozzle and into the mold, the melt pressure regulating mechanism comprising a pressure regulating device, comprising at least one of a fluid pressure regulating valve and a pressure relief valve.
21 Citations
9 Claims
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1. A melt pressure regulating mechanism for an injection molding apparatus having a melt holder for pressurizing molten plastic prior to injection into a mold, and an injection element for advancing the molten plastic from the melt holder through a nozzle and into the mold, the melt pressure regulating mechanism comprising:
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a fluid pressure regulating valve having a valve body with a molten plastic inlet and a molten plastic outlet connected by a molten plastic passageway, wherein the fluid pressure regulating valve is configured to control an amount of molten plastic moving through the molten plastic passageway such that the molten plastic that is downstream from the fluid pressure regulating valve is maintained at a substantially constant pressure; and a pressure relief valve oriented in series with the fluid pressure regulating valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification