Method of building up pressure by multi-shaft screw extruders

Details Method of building up pressure by multi-shaft screw extruders Method of building up pressure by multi-shaft screw extruders

1975-09-22

1977-08-09

Aegerter, Richard E.

Plastic article or earthenware shaping or treating: apparatus

Projection

425204, B29B 110

Patent

active

040406075

ABSTRACT:
This invention relates to multi-shaft screw extruders in which the screw shafts are arranged to intermesh in pairs and rotate pairwise in the same sense, each shaft of a pair having at least one double threaded or triple threaded pressure build-up section corresponding to that of the other shaft. This invention also relates to a method of using such an extruder to build up pressure within a material with a minimum pressure build-up section and a minimum power input. The extruder and its method of operation are characterized by the fact that at least a portion of the pressure build-up section satisfies ##EQU1## WHEREIN T IS THE SCREW PITCH, D IS THE INTERNAL DIAMETER OF THE HOUSING, Q IS THE VOLUMETRIC THROUGHPUT OF MATERIAL OF A SCREW PAIR AND N IS THE SPEED OF ROTATION OF THE SCREW SHAFTS AND: ##EQU2## WHEREIN IN TRIPLE THREAD PRESSURE BUILD-UP SECTIONS A = 0.1082;

REFERENCES:
patent: 3146493 (1964-09-01), Steinle et al.
patent: 3423074 (1969-01-01), Loomans
patent: 3525124 (1970-08-01), Ocker
patent: 3749375 (1973-07-01), Hermann et al.

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