Polystyrene foam extrusion

Details Polystyrene foam extrusion Polystyrene foam extrusion

1976-12-08

1978-07-04

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

521 51, 521 79, 428305, 428315, B32B 326

Patent

active

040989410

ABSTRACT:
Polystyrene foam is extruded upwardly as a tube into a cooling media of boiling water, both the interior and exterior surfaces of the cylindrically shaped extrudate passing through a bath of boiling water of variable depth. The polystyrene foam extrudate produced by such a method has a high density at the interior and exterior surfaces, with the density progressively decreasing from these surfaces toward the center core of the extrudate.

REFERENCES:
patent: 3099516 (1963-07-01), Henrickson
patent: 3189243 (1965-06-01), Lux
patent: 3299192 (1967-01-01), Lux
patent: 3344222 (1967-09-01), Shapiro et al.
patent: 3363034 (1968-01-01), Noland et al.
patent: 3391051 (1968-07-01), Ehrenfreund et al.
patent: 3523988 (1970-08-01), Roehr et al.

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