Dimension-control and clamp reduction during injection molding o

Details Dimension-control and clamp reduction during injection molding o Dimension-control and clamp reduction during injection molding o

1992-07-10

1993-11-16

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264268, 26432812, 26432816, 425577, B29C 4514

Patent

active

052621120

ABSTRACT:
The dimensions of an injection molded hollow plastic product having laminated walls is controlled and the separative forces exerted against mold sections during molding of the products within a cavity of a mold having a core section and a cavity section defining the mold cavity therebetween, are reduced by methods including the steps of (a) injecting a first plastic material into the mold cavity; (b) cooling the injected first plastic material in the mold cavity; (c) injecting subsequent to injecting the first plastic material, a second plastic material into the mold cavity so that the cooled injected first plastic material is sufficiently solidified to stabilize the core section in relation to the cavity section by impeding movement of the core section in relation to the cavity section caused by injecting the second plastic material, whereby the injected second plastic material further fills the mold cavity; and (d) cooling the injected plastic material in the mold cavity to thereby solidify the molded product; wherein step (a) comprises the step of: (e) continuing the injection of the first plastic material by the second plastic material without intermission.

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