ApplicationNo. 05/749092 filed on 12/09/1976
US Classes:222/63, Motor control222/146.5, By electrical energy222/413, Screw with terminal outlet only425/144, Of mold cavity or fluent material to shaping or discharging orifice425/379.1Plural spaced
ExaminersPrimary: Spar, Robert J.
Assistant: Handren, Frederick R.
Attorney, Agent or Firm
International ClassesB29C 45/50 (20060101)
B29C 45/46 (20060101)
B29C 45/72 (20060101)
B29C 45/74 (20060101)
B29C 47/82 (20060101)
B29C 47/78 (20060101)
B29C 35/02 (20060101)
B29C 35/16 (20060101)
B29C 35/00 (20060101)
B29C 47/92 (20060101)
Foreign Application Priority Data1976-04-23 GB
AbstractApparatus for moulding articles of synthetic plastics. Plasticized plastics material is fed by a screw within a cylinder, along the cylinder to a nozzle from whence the material is injected into the mould cavity. The feeding of the material into the mould cavity is however effected by rotation of the screw almost in its forwardmost position instead of by longitudinal movement of the screw from its rearwardmost to its forwardmost position. The longitudinal position of the screw is adjusted during filling of the mould cavity by biasing apparatus acting axially on the screw and controlled by means sensing the position of the screw.The temperature distribution throughout the cylinder, the nozzle, the screw and the screw tip is controlled by separate cooling circuits for the various zones, the various cooling circuits coming into operation at various times during a moulding cycle, as determined by timing apparatus.