发明名称 Moulding method and apparatus
摘要 A method and apparatus are provided for moulding an article by feeding molten plastics material into a metering cavity (16), feeding a predetermined quantity of the material from the metering cavity into a mould cavity via a transition passage (26) adjacent the mould cavity and urging the molten plastics material from the transition passage into the mould cavity with a working stroke of a packing piston (24), until the packing piston closes a port (28) defined between the transition passage and the mould cavity and a leading face (32) of the packing piston forms part of the peripheral wall of the mould. Less than ninety percent of the mould cavity is filled with the molten plastics material when the packing piston starts its working stroke and the packing piston starts its working stroke while molten plastics material is still being fed from the metering cavity.
申请公布号 USRE45027(E1) 申请公布日期 2014.07.22
申请号 US201113294104 申请日期 2011.11.10
申请人 Lomold Corporation NV 发明人 Crawford David Barry
分类号 B29C45/76 主分类号 B29C45/76
代理机构 Miles & Stockbridge P.C. 代理人 Miles & Stockbridge P.C.
主权项 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 pistondisplaceable member 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.
地址 Willemstad, Curacao AN