PLASTICATING SCREW FOR POLYMERIC MATERIAL

A new plasticating apparatus including a rotating and reciprocating screw having a helical flight that is wrapped around a core, having a feed zone, transition zone and metering zone, disposed within and cooperating with the inner wall of a heated barrel that substantially increases the melt quality...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	DURINA, Michael, F
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A new plasticating apparatus including a rotating and reciprocating screw having a helical flight that is wrapped around a core, having a feed zone, transition zone and metering zone, disposed within and cooperating with the inner wall of a heated barrel that substantially increases the melt quality of a polymeric material. This is accomplished by first incorporating at least one significant increase in the helix angle of the primary flight followed by at least one decrease of the helix angle, occurring downstream of the taper terminus of the transition zone, in cooperation with a stepped change in the root that terminates either upstream or downstream of the end of one complete revolution of the flight.