| 摘要 |
Apparatus is disclosed for use in the moulding or extrusion of synthetic plastics products in which the axial position of a rotatable plasticising screw 14 in a cylinder 10 is controlled, via a hydraulic piston (20) and cylinder (30), through a hydraulic servo-valve 26, by means of a position programmer 32, in accordance with signals received by the position programmer from a displacement transducer 24 and one or more sensors, for example a temperature sensor 40 which, in accordance with a control algorithm (38) determines or jointly determine a set value to be matched, by operation of the servo-system, with the sensed value of the screw displacement, as sensed by transducer 24. It is thus possible to maintain closer control over the plasticising conditions than has previously been possible. <IMAGE>
|
