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:
Jun. 20, 2000
Filed:
Oct. 14, 1998
John P Beaumont, Harborcreek, PA (US);
The Penn State Research Foundation, University Park, PA (US);
Abstract
A method of balancing the flow of a molten polymer containing material in a multi-runner injection mold includes the step of providing a mold body having at least one mold cavity and at least two runners. The first runner includes first and second ends and is connected to a source of molten material. The first runner is connected to a second runner. The second runner is connected to the at least one mold cavity. A stream of a molten polymer containing material flows through the first and second runners. The stream is repositioned in a circumferential direction as it flows from the first runner through the second runner while maintaining continuity between laminates of the stream of the molten material in a radial direction. In this way, a balance is provided for the melt temperatures and material properties of the cross branching runners. An apparatus for producing molded products having balanced thermal, material and flow properties includes a device for repositioning a stream of the molten polymer containing material as it flows from a first runner into at least a second downstream runner. If desired, the stream of molten thermoplastic material can be repositioned by approximately 90 degrees.