Method for the extrusion of foam shapes

Details Method for the extrusion of foam shapes Method for the extrusion of foam shapes

1974-09-23

1976-10-12

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 264 54, 264210R, 264280, 264295, 264321, 264339, B29D 2700, B29F 300

Patent

active

039858472

ABSTRACT:
Foamed shapes having an elongate cross-sectional configuration are prepared extruding with the major axis of the cross-sectional configuration of the die opening in a generally vertical plane, passing the extrudate to a shaping device having the desired elongate cross-sectional configuration which has its major axis in a generally horizontal plane. Improved extrusion rates are obtainable and the amount of blowing agent required to provide a given degree of expansion is reduced when compared to extrusion with the major axis of the extrusion die disposed in a horizontal plane.

REFERENCES:
patent: 3258515 (1966-06-01), Brown
patent: 3426111 (1969-02-01), Simpson
patent: 3795729 (1974-03-01), Asakura et al.

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