Process for expanding thermoformable materials having clear surf

Details Process for expanding thermoformable materials having clear surf Process for expanding thermoformable materials having clear surf

1980-01-25

1982-02-09

Anderson, Philip

Stock material or miscellaneous articles

Structurally defined web or sheet

Including sheet or component perpendicular to plane of web...

264164, 425384, 425445, 425812, 428116, B32B 312, B29C 1702

Patent

active

043150519

ABSTRACT:
A process for producing a clear surface on expanded thermoformable material is disclosed. A film layer of non bondable plastic material is disposed adjacent the clear plastic material to be expanded. After the expansion process the film layer is removed leaving a clear smooth surface.

REFERENCES:
patent: 3765810 (1973-10-01), Smarook
patent: 3919445 (1975-11-01), Smarook
patent: 3919446 (1975-11-01), Smarook
patent: 4113909 (1978-09-01), Beasley
patent: 4264293 (1981-04-01), Rourke
patent: 4269586 (1981-05-01), Ronayne

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