Dispensing – Automatic control – Motor control
Patent
1976-12-09
1980-01-15
Spar, Robert J.
Dispensing
Automatic control
Motor control
222146HE, 222413, 425144, 425379R, B29F 306, B29F 308
Patent
active
041834488
ABSTRACT:
Apparatus 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.
REFERENCES:
patent: 3331100 (1967-07-01), Gould
patent: 3588956 (1971-06-01), Poux et al.
patent: 3822867 (1974-07-01), Evans
Durapipe Limited
Handren Frederick R.
Spar Robert J.
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