The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1992
Filed:
Jun. 18, 1991
Tom W Johnson, Hunting Valley, OH (US);
Jay F Moldovanyi, Brecksville, OH (US);
Nitrojection Corporation, Middlefield, OH (US);
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.