| 摘要 |
Granular plastics material 4 is heat plasticised by shear in a melt chamber 1 under the action of a rotor 10 having radially projecting legs 11, and is delivered under pressure towards an injection moulding or extruding die 8, the major portion of the material 4 being melted by heat generated by friction and shear forces arising from the material eddying in the melt chamber 1, and the pressure being generated by a feed means 3 upstream of the melt chamber 1, which may comprise a pair of screws 3, or a single screw which may carry the rotor 10 at its downstream end. The rotor 10 may reciprocate radially and/or axially e.g. to effect injection and an adjustable or replaceable throttle may be provided between the chamber 1 and the die. The plasticised material arrives at the die 8 under a pressure slightly less than that generated by the feed means 3, and the heat generated by the rotor 10 is substantially equal to that required for melting the material 4. <IMAGE>
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