Foam plastics sheet materials

Details Foam plastics sheet materials Foam plastics sheet materials

1979-07-10

1980-12-23

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

156 79, 156277, 427258, 427373, 427265, 428159, 428172, 428315, B32B 300, B32B 326

Patent

active

042411254

ABSTRACT:
Foam plastics sheet material, such as a wallcovering, has a pronounced decorative relief finish and comprises a substrate web with a foam coating some at least of which is blistered. The blistering is achieved by having two foamable coatings on the web, the lower of which is sacrificed to produce the blistering in the upper. In one method the lower coating is foamed, the upper coating is then applied in its pre-foamed state, and then heated so that the lower coating is sacrificed and the upper coating is foamed and blistered. In another method both coatings are applied in their unfoamed state with the lower coating having a lower foaming temperature than that of the upper coating. Both coatings are then heated together. The lower coating foams and is then sacrificed. The upper coating foams and blisters.

REFERENCES:
patent: 3278466 (1966-10-01), Cram
patent: 3362862 (1968-01-01), King
patent: 3607593 (1971-09-01), Semenzato
patent: 3649325 (1972-03-01), Affeldt
patent: 3914485 (1975-10-01), Curtis
patent: 3931429 (1976-01-01), Austin
patent: 4068030 (1978-01-01), Witman
Chem. Abst., vol. 83, No. 14, Oct. 6, 1975, Abstract Number 116404c, p. 111.

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