Method of making a foamed plastic

Details Method of making a foamed plastic Method of making a foamed plastic

1978-10-26

1982-06-08

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264DIG18, 521 79, 521 81, 521 82, 521134, 521143, 521154, B29D 702

Patent

active

043338984

ABSTRACT:
An elastomeric or thermoplastic polymer, such as polyethylene, is mixed with silane for grafting onto the polyethylene; after grafting the material is extruded around a cable, a conductor, tubing or the like, but just prior to extrusion moist nitrogen is forced into the extruder so that the material will expand to foam, the cells being filled with moist gas so that the cell walls crosslink to stabilize the resulting foam sheath.

REFERENCES:
patent: 2948665 (1960-08-01), Rubens et al.
patent: 2960482 (1960-11-01), Henning
patent: 3017371 (1962-01-01), Hohenberg et al.

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