Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Control means responsive to product weight or dimension
Patent
1995-10-26
1997-09-09
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Control means responsive to product weight or dimension
264 404, 425466, 425532, B29C 4978
Patent
active
056653999
ABSTRACT:
An extrusion blow mounding control system for controlling parison wall thickness in an extrusion blow moulding machine includes a wall thickness controller for controlling the width of an extrusion die gap defining parison wall thickness within the machine, an interface unit for supplying an input signal to the wall thickness controller dependent on an actual position signal from a position transducer indicative of the actual position of a movable die member delimiting the die gap, and an output for supplying a desired position signal from the wall thickness controller to an electrohydraulic servo valve for controlling the position of the movable die member to provide a desired width of the die gap. The interface unit includes signal processing circuitry for receiving the actual position signal from the position transducer and a feedback signal from an automatic weighing system indicative of weight variation of product outputted by the machine and for producing the input signal for the wall thickness controller in dependence on the actual position signal and the feedback signal. Such a closed loop control system can be used to control the weight of the final product within a narrow weight range, and this results in improved product consistency and quality, as well as enabling the total quantity of moulding material used in moulding of the product to be decreased.
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R. Hegele et al., "Gewichtsregelung an kontinuierlich extrudierenden Blasformanlagen", Machinen und Verarbeitung, vol. 70, No. 9, 1980, pp. 522-524.
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