Patent ID: 7846359
Filing Date: 2010-12-07
Classification: B29C

Abstract:
1. A method of moulding an article, said method comprising: feeding mouldable material into a metering cavity; feeding the mouldable material from the metering cavity into a mould cavity via a transition passage, the transition passage being defined adjacent the mould cavity; and urging some of the mouldable material from the transition passage into the mould cavity with a working stroke of a packing piston, until the packing piston closes a port defined between the transition passage and the mould cavity and a leading face of the packing piston forms part of the peripheral wall of the mould; characterised in that a known, predetermined, metered volume of the mouldable material is fed from the metering cavity by a working stroke of a metering piston that is displaceable within the metering cavity, into the mould cavity and the displacement of the metering piston within the metering cavity is monitored to control the volume of mouldable material that is fed from the metering cavity, further characterised in that the packing piston starts its working stroke while mouldable material is still being fed from the metering cavity, such that an uninterrupted flow of mouldable material in the transition passage is maintained.