Process for the continuous foaming of plastics

Details Process for the continuous foaming of plastics Process for the continuous foaming of plastics

1983-01-04

1985-01-08

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264338, 264DIG84, 425817C, B29D 2704

Patent

active

044926642

ABSTRACT:
A process for the continuous foaming of plastics, especially polyurethane, of the type in which the foaming space is delimited by flexible material bands which are fed together with the bun of foamed material being formed. As flexible material for these bands a composite web is used which comprises a support paper band and a thin impermeable band of plastics, preferably polyethylene having a thickness from 5 to 40 microns. The two bands of which the flexible is composed have a reduced adhesion to one another. The paper band is then detached from the bun of foamed material by disengaging it from the band of plastics which is left permanently adherent to the foamed material or is detached from this latter in an operation subsequent to the detachment of the paper band. In this way, losses of material are avoided, and the paper of the paper bands can be recovered.

REFERENCES:
patent: 3906068 (1975-09-01), Hanusa
patent: 3984195 (1976-10-01), Del Carpio
patent: 4074960 (1978-02-01), Dockray et al.
patent: 4154562 (1979-05-01), Tabler
patent: 4343164 (1982-09-01), Fujii et al.

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