Process for gas assisted injection molding

Details Process for gas assisted injection molding Process for gas assisted injection molding

1991-06-18

1992-12-29

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

55 97, 264 37, 2643288, 26432812, 26432813, 264572, B29C 4500, B29C 4524, B29D 2200

Patent

active

051749327

ABSTRACT:
A method for injecting a viscous fluid, such as a thermoplastic, and a non-viscous fluid, such as a gas, into a mold cavity of a mold body includes providing a valve element mounted for reciprocation in a nozzle body flow passage to regulate a flow of viscous fluid through the nozzle body discharge end and into a mold cavity. The valve element includes a barrel having a first end selectively engaging 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 barrel bore. The pin has a first end located adjacent the barrel first end and a second end. A non-viscous fluid flow passage is defined between the pin and the barrel. A viscous fluid flows through the nozzle body flow passage around the barrel and into a mold cavity. A non-viscous fluid flows through the non-viscous fluid flow passage defined between the barrel and the pin and into the mold cavity. A non-viscous fluid cavity is formed in the viscous fluid which then cools to form an injection molded part. An initial portion of the non-viscous fluid is then allowed to flow out of the non-viscous fluid 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.

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