Method for preparing foam plastic loose fill packing

Details Method for preparing foam plastic loose fill packing Method for preparing foam plastic loose fill packing

1973-06-11

1978-02-14

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264143, 264150, 425380, 425461, B29D 2700, B29B 103

Patent

active

040738426

ABSTRACT:
Loose fill foam plastic packing is prepared by extruding an expandable plastic composition to form an unfoamed or unexpanded strand which is subsequently cut into short lengths and foamed, the improvement which comprises extruding the strand through a generally helical passageway. The strand on foaming has a generally helical configuration.

REFERENCES:
patent: 2528528 (1950-11-01), Lyon
patent: 3026274 (1962-03-01), McMillan et al.
patent: 3033806 (1962-05-01), Spencer
patent: 3066382 (1962-12-01), Zweigle et al.
patent: 3385917 (1968-05-01), Breukink et al.
patent: 3400037 (1968-09-01), Sare et al.
patent: 3632705 (1972-01-01), Makowski
"Plastifying Extrusion" by Louis Street, Int. Plastics Engr., Jul. 1961, pp. 3-10.

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