Hot runner nozzle with a gate pressure equalizer
First Claim
1. A hot runner nozzle (200, 300) for passing melt into a mold cavity (210, 310), the hot runner nozzle comprising:
- a nozzle housing (202, 302) defining a primary melt channel (204, 304);
a first nozzle tip (208, 308), the first nozzle tip (208, 308) having a first secondary melt channel (206, 306) in fluid communication with the primary melt channel (204, 304);
a second nozzle tip (208, 308), the second nozzle tip (208, 308) having a second secondary melt channel (206, 306) in fluid communication with the primary melt channel (204, 304); and
a valve disposed in the primary melt channel (204, 304) for selectively moving between an open and a closed position, in the closed position melt is stopped from flowing out of a downstream end (216, 316) of the primary melt channel (204, 304), and in the open position melt is allowed to flow from the primary melt channel to the second secondary melt channels (206, 306).
3 Assignments
0 Petitions
Reexamination
Accused Products
Abstract
A method and apparatus for equalizing gate pressure of a hot runner nozzle are disclosed. The nozzle includes a nozzle housing defining a primary melt channel, a first nozzle tip having a first secondary melt channel in fluid communication with the primary melt channel, a second nozzle tip having a second secondary melt channel in fluid communication with the primary melt channel, and a valve disposed in the primary melt channel for selectively opening and closing a downstream end of the primary melt channel to control a flow of melt to the first and second secondary melt channels. In some embodiments, the valve is configured to selectively open when a pressure of the melt reaches a threshold peak pressure. In some embodiments, the valve includes a valve stem that cooperates with the primary melt channel to block a flow of melt therefrom until the threshold peak pressure is established.
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Citations
7 Claims
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1. A hot runner nozzle (200, 300) for passing melt into a mold cavity (210, 310), the hot runner nozzle comprising:
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a nozzle housing (202, 302) defining a primary melt channel (204, 304); a first nozzle tip (208, 308), the first nozzle tip (208, 308) having a first secondary melt channel (206, 306) in fluid communication with the primary melt channel (204, 304); a second nozzle tip (208, 308), the second nozzle tip (208, 308) having a second secondary melt channel (206, 306) in fluid communication with the primary melt channel (204, 304); and a valve disposed in the primary melt channel (204, 304) for selectively moving between an open and a closed position, in the closed position melt is stopped from flowing out of a downstream end (216, 316) of the primary melt channel (204, 304), and in the open position melt is allowed to flow from the primary melt channel to the second secondary melt channels (206, 306). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification