Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-12-30
1999-01-12
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264318, 2643281, 249 65, B29C 4526, B29C 4544
Patent
active
058582959
ABSTRACT:
A method of injection molding includes the steps of providing a source of pressurized flowable material, a source of pressurized fluid, and a mold assembly actuatable from an open position to a closed position. The mold assembly includes first and second matable mold portions that define a substantially sealed cavity, an inflatable core member positioned within the substantially sealed cavity and secured to the first mold portion, a pressurized fluid path from the source of pressurized fluid through the first mold portion to the inflatable core member, and a flowable material path from the source of pressurized flowable material into the cavity. The pressurized fluid is introduced into the inflatable core member at a first pressure to provide an inflated core member that defines a core boundary and the pressurized flowable material is injected into a space defined by the cavity and the core boundary at a pressure less than the first pressure. After the flowable material transitions to a solid state, the pressurized fluid is removed from the inflated core member, the mold is opened, and the solid article is removed from the mold assembly.
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Heitbrink Jill L.
Johnson & Johnson Professional Inc.
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