Method of co-extrusion with foam core

Details Method of co-extrusion with foam core Method of co-extrusion with foam core

1976-03-26

1978-08-15

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264171, 264DIG13, 428 71, 428305, 428315, B29D 2700

Patent

active

041072472

ABSTRACT:
This invention relates to a method for the manufacture of plastic sandwich element in which a first extruder is charged with essential ingredients for productions of foamed cellular plastic at a predetermined temperature. A second extruder is charged with essential ingredients for production of solid plastic at a temperature of at least 25 degrees farenheit from the predetermined temperature. The resulting sandwich is extruded through an extrusion die forming an integral plastic sandwich with the solid plastic layer controlling to a desired extent further foaming of the cellular plastic.

REFERENCES:
patent: 3029476 (1962-04-01), Merck et al.
patent: 3331900 (1967-07-01), Thomas
patent: 3524795 (1970-08-01), Peterson
patent: 3559239 (1971-02-01), Work et al.
patent: 3611492 (1971-10-01), Scheibling
patent: 3707590 (1972-12-01), Wiggins et al.
patent: 3933964 (1976-01-01), Brooks
patent: 3956438 (1976-05-01), Schippers
patent: 4053341 (1977-10-01), Kleiner et al.

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