Method and apparatus for producing an injection moulding of plas

Details Method and apparatus for producing an injection moulding of plas Method and apparatus for producing an injection moulding of plas

1996-11-25

1998-06-23

Timm, Catherine

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, B29C 4503

Patent

active

057702373

ABSTRACT:
The production of an injection moulding of plastics material that includes introducing a supply of plastics material through one or more openings in a mould space, and introducing by way of at least one gas supply passage, a pressurized gas through a separate opening in the mould space into the plastics material within the mould space whereby the gas creates a gas containing cavity in the plastics material. An opening and closing of the gas supply passage is controlled by a valve which is opened by the pressurized gas with the valve featuring a valve port at the outlet end of the gas passage, and a movable valve member extending longitudinally of the gas passage for opening and closing the valve port. The valve member at least when in its extended or valve port open position, protrudes into the mould space and penetrates the plastics material to assist the gas in entering the plastics material. Also, with the valve member in its withdrawn or valve port closed position, plastics material is shut off from entering the end of the passage from the mould space.

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