Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles
Patent
1998-10-14
2000-06-20
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Forming plural articles
2643288, 26432812, 366336, 425572, 425588, B29C 4530
Patent
active
060774703
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.
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Article from Journal of Injection Molding Technology, dated Sep. 1997, vol. 1, No. 3 entitled "Mold Filling Imbalances in Geometrically Balanced Runner Systems" by John P. Beaumont and Jack H. Young (pp. 133-144).
Article from Journal of Injection Molding Technology dated Jun. 1998, vol. 2, No. entitled Solving Mold Filling Imbalances in Multi-Cavity Injection Molds by John P. Beaumont, Jack H. Young and Matthew J. Jaworski (pp. 47-58).
Heitbrink Jill L.
Monahan Thomas J.
The Penn State Research Foundation
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