EXTRUSION OF HIGHLY VISCOUS THERMOPLASTICS ON A SIGNALE SCREW EXTRUDER

The extruder produces a lower temp. rise with higher output and reduced energy, so that it is effective for high viscosity materials. The extruder has five zones in the following sequence (1) inlet with constant section, (2) compression zone, (3) plasticising sheat zone not longer than one eighth th...

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Bibliographische Detailangaben
1. Verfasser:	SCHIEDRUM H
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS 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:	The extruder produces a lower temp. rise with higher output and reduced energy, so that it is effective for high viscosity materials. The extruder has five zones in the following sequence (1) inlet with constant section, (2) compression zone, (3) plasticising sheat zone not longer than one eighth the worm length, (4) decompression zone, and (5) outlet zone of constant section. The worm peripheral speed in the compression zone is >13 m/min. The total energy imparted to the mass by the extruder is is not >0.25 kWh/kg.