Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1997-01-14
1999-01-26
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264513, 264572, 26432817, 425130, B29C 4516
Patent
active
058634878
ABSTRACT:
A method is provided for injection molding of parts in a mold having a mold cavity. The method comprises: 1) supplying pressurized fluid to a mold cavity prior to injection; 2) injecting a combination of non-mixable materials into the mold cavity against the pressurized fluid, thereby creating a resultant internal counterpressure within the combination of materials; and 3) maintaining the internal counterpressure within the combination of materials sufficiently to cause the materials to solidify in a predetermined configuration based on their respective modulus.
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"Investigation of Processing-Structure-Property Relationships in Structural Foam Molding", Alex W. Kawczak & Duane Krueger, The Dow Chemical Company, pp. 67-78.
"Injection Molding: Gas Counter Pressure Process", Integral/Structural Polymer Foams, Editors: G. Henrici-Olive and S. Olive; English by F.A. Shutov, 1986, pp. 71-74.
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