Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream... – Centripetal elastic melt extruder type
Patent
1975-01-28
1977-10-11
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
Centripetal elastic melt extruder type
264209, 264310, 425467, B29D 2304
Patent
active
040532747
ABSTRACT:
An apparatus and method are provided for forming tubing of plastic which is forced through a die over a mandrel wherein the inside surface of the tubing is relatively smooth in configuration and the exterior surface thereof is formed with one or more helical ribs or teeth protruding outwardly therefrom which serve to enhance the rigidity of the tube wall and, when the plastic itself is relatively rigid, to render the tube wall more flexible so that it may be deformed or bent without collapsing. In one form, the extrusion die through which the extrusion material is forced to form the tube, is configured to provide the helical formations in the outer stratum of the tube wall and is power rotated as the extrudate is forced through the die to form the helical formation therein. In another form, a portion of the extrusion die is power rotated to form the helical formation. In a third form, control of the rotation of the die or a device located at the throat or exit of the die is affected to perform either or both of the functions of variably changing the shape of the helical formation and, providing portions of the tubing which are free of the helical formation to permit fittings to be attached thereto.
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Husar Francis S.
Rosenbaum Mark
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