Mould and method for injection-compression moulding

Details Mould and method for injection-compression moulding Mould and method for injection-compression moulding

2006-08-15

2006-08-15

Heitbrink, Jill L. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C264S328800, C425S577000, C425S590000, C425S594000

Reexamination Certificate

active

07090800

ABSTRACT:
A mold, a molding machine and a method of molding a plastics material in a mold cavity is described which relies primarily on movement of a part of the mold to provide the pressure necessary to force the plastics material melt to fill all the parts of the mold cavity. The method comprises the steps of applying a light pressure to close the mold, injecting a predetermined quantity of molten plastics material into the mold cavity at a pressure which is such that the injection of the plastics material can cause the cavity to expand in volume against the resistance of the light closing pressure, and applying a high pressure to close the mold fully after completion of the injection step.

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