Spiral-line press for thermoplastic synthetics

Details Spiral-line press for thermoplastic synthetics Spiral-line press for thermoplastic synthetics

1975-10-21

1978-02-07

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

100146, 425208, 425380, 425467, B29F 306

Patent

active

040724557

ABSTRACT:
A spiral-line press with a double contra-screw arrangement fixed on a single shaft. Each of the screws on the spiral-line press have a length/diameter ratio of less than or equal to 14/1 and a combined L/D - ratio of less than or equal to 28/1. In addition, the phase depth of the metering zones are less than or equal to 1/25th of the spiral diameter and the peripheral speed of the spiral-line press is greater than or equal to 0.3 m/sec. The output from the metering zones of the spiral-line press are extruded by an outlet fitting which transforms the flows of the extruded matter so that one output is extruded concentrically around the other.

REFERENCES:
patent: 3191228 (1965-06-01), Schluter
patent: 3295160 (1967-01-01), Schippers
patent: 3507951 (1970-04-01), Morecroft et al.
patent: 3577588 (1971-05-01), Chisholm

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