Extrusion of polymers

Processes and apparatus for melt extrusion of polymeric compositions, particularly conductive polymers, in which a gear pump delivers molten polymeric composition to an extrusion orifice. Overfeeding of the composition due to pressure variations is avoided by means of a polymer relief means, prefera...

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Bibliographische Detailangaben
Hauptverfasser:	EDWARD F CHU, SUSAN M. JORDAN, JOHN LAHLOUH
Format:	Patent
Sprache:	eng
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:	Processes and apparatus for melt extrusion of polymeric compositions, particularly conductive polymers, in which a gear pump delivers molten polymeric composition to an extrusion orifice. Overfeeding of the composition due to pressure variations is avoided by means of a polymer relief means, preferably a second, smaller gear pump, which removes a portion of the molten composition when the pressure exceeds a selected level.