Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1992-06-23
1994-04-12
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
B29C 4520, B29C 4500
Patent
active
053023390
ABSTRACT:
A method for injecting a viscous fluid and a non-viscous fluid into a mold cavity of a mold body includes the step of regulating a flow of viscous fluid through a nozzle body discharge end and into a mold cavity with a valve element. The valve element is mounted for reciprocation in a nozzle body flow passage and includes a barrel having a first end, which selectively engages a portion of the nozzle body discharge end to prevent a flow of viscous fluid therepast, and a second end. A bore extends longitudinally through the barrel and a pin is positioned in the bore. A non-viscous fluid flow passage is defined between the pin and the barrel wherein the non-viscous fluid flow passage is annular in shape and has a substantially constant diameter at and adjacent the barrel first end. A viscous fluid flows through the nozzle body flow passage around the barrel and into the mold cavity. A non-viscous fluid flows through the non-viscous fluid flow passage around the pin and into the mold cavity.
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The Best of Two Worlds in Plastic Processing, Machine Design Magazine Dec. 9, 1982, by Donald R. Dreger, Staff Editor.
Baxi Indra R.
Johnson Tom W.
Nitrojection Corporation
Timm Catherine
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