Sheet materials

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1976-09-14

1978-06-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

156 79, 264 458, 264DIG82, 427264, 427307, 427373, 428159, 428161, 428165, B29D 2700

Patent

active

040936864

ABSTRACT:
A process for the manufacture of a differentially expanded sheet material comprises applying an organic solvent to the surface of an expandable thermoplastic sheet containing a blowing agent and allowing the treated sheet to at least partially dry before a composition comprising an ink and a kicker for the blowing agent is applied to selected areas of the treated surface. The sheet is then heated so that differential expansion occurs.

REFERENCES:
patent: 3464934 (1969-09-01), Birkett et al.
patent: 3552997 (1971-01-01), Powell et al.
patent: 3574070 (1971-04-01), Sahely
patent: 3650914 (1972-03-01), Lin
patent: 3660187 (1972-05-01), Shortway et al.
patent: 3772138 (1973-11-01), Witman

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