Apparatus for the continuous extrusion of small cross-section th

Details Apparatus for the continuous extrusion of small cross-section th Apparatus for the continuous extrusion of small cross-section th

1975-01-22

1976-06-29

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425235, 425324R, 425335, 425363, 264 54, B29G 700

Patent

active

039663736

ABSTRACT:
Thermoplastic polymers containing a blowing agent are extruded into an unconfined zone and allowed to partially expand. The polymers are then conveyed through a confined moving passage of predetermined configuration formed, for example, by intermeshing cooled rolls, to shape the extrudate to the predetermined configuration and solidify the surface layers. The extrudate is further cooled by subjecting alternate surfaces to cooled roll surfaces, whereby a continuous ribbon, or shaped extrudate, having a dense skin and a foamed core is formed. The method is particularly applicable to small cross-section profiles which can be cut into short lengths to be useful as ice-cream sticks or tongue depressors.

REFERENCES:
patent: 2323862 (1943-07-01), Zimmerman et al.
patent: 2349829 (1944-05-01), Nydegger et al.
patent: 2620513 (1952-12-01), Cryor et al.
patent: 3700368 (1972-10-01), Wells
patent: 3857664 (1974-12-01), Johnson et al.

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