Method of injection moulding

Details Method of injection moulding Method of injection moulding

1988-04-28

1990-05-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

26432812, 26432813, 425812, B29C 4534, B29D 2200

Patent

active

049236660

ABSTRACT:
A resin moulding is produced by introducing molten synthetic thermoplastic resin into a mould cavity, sufficient to fill completely the mould cavity. Subsequently, during the cooling of the resin, pressurized gas is introduced into the resin within the mould cavity. The resin moulding cools and hardens in the mould cavity while the gas is maintained under pressure. The mould cavity is designed to manufacture mouldings with unevenly distributed thick walled sections connected to at least one gate for the introduction of the pressurized gas, which flows only within the resin forming the thick walled sections and immediately adjacent areas of the moulding thereby taking up the shrinkage in the resin.

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