Method and apparatus for injection moulding

Details Method and apparatus for injection moulding Method and apparatus for injection moulding

B - Operations, Transporting

29

C

B29C 45/17 (2006.01)

Patent

CA 2135303

The production of an injection moulding of plastics material comprises introducing a supply of plastics material through one or more openings in a mould space, and introducing by means of at least one gas supply passage a pressurised gas through a separate opening (44) in the mould space (13) into the plastics material filling the mould space whereby the gas creates a gas containing cavity (25) in the plastics material. Opening and closing of the gas supply passage (56) is controlled by a valve which is opened by the pressurised gas. The valve comprises a valve port (50) at the outlet end of the gas passage, and a movable valve member (31) extending longitudinally of the gas passage (56) for opening and closing the valve port (54). The valve member (31) at least when in its extended or valve port open position protrudes into the mould space and penetrates the plastics material thereby assisting the gas to enter the plastics material. Also with the valve member (31) in its withdrawn or valve port closed position plastics material is shut off from entering the end of the passage (56) from the mould space.

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