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
1983-05-12
1985-10-22
Thurlow, Jeffery
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
264 406, 2642092, 4251746, 425379R, 425381, 425466, B29F 308
Patent
active
045485704
ABSTRACT:
Apparatus is disclosed for the formation of pipe comprising one or more layers of thermoplastic resin. The apparatus comprises a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by radial members extending from the inside surface of the bore to provide an annular extrusion passageway defined by the inside surface of the housing and the outer surface of the mandrel. The housing includes therein a plurality of electrically resistive heating elements longitudinally positioned parallel to the extrusion passageway to selectively heat the thermoplastic material flowing therethrough in proximity to the heated section thereby increasing the laydown of thermoplastic material. Also included in the housing is plurality of radially adjustable elements having electrically resistive heating elements therein to radially reposition a moveable discharge sleeve held therebetween thereby controlling the wall thickness of the thermoplastic material passing in proximity thereto. The extrusion passageway is constricted downwstream of the radial support but prior to the annular sequentially positioned feed rings to reunite the thermoplastic material after the flow disruption created by the radial support members. Also included in the mandrel is a central longitudinal passageway in communication with the inlet section of the bore for the transportation of thermoplastic material therethrough to one or more of the annular feed rings. The mouth of the mandrel bore includes a restrictor orifice therein to balance the pressure differential created therein by the constriction in the extrusion passageway.
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Hahn Granville J.
Rutledge Raleigh N.
Cheairs M. Norwood
Cosden Technology, Inc.
Sproule Robert H.
Thurlow Jeffery
Van Winkle Roy L.
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