Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1979-08-20
1981-11-10
Silverman, Stanley S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428921, B32B 330
Patent
active
042998751
ABSTRACT:
Printed wood paneling having a reduced flame spread rating is provided by embossing the wood surface to be finished to depress in a relatively uniform pattern of depressed portions at least about 20% up to about 70% of the surface area of the wood to a depth of at least about 0.01 inch, and these depressed portions are then filled with an intumescent fire retardant filler and the excess filler is substantially removed from the undepressed portions of the wood surface. The embossed panel with the depressed portions thereof filled with intumescent fire retardant filler is then finished in conventional fashion by applying a filler, sanding, base coating, printing, and usually embossing. A clear topcoat is then applied to protect the finish. When a flame impinges upon the finished surface, the heat is transmitted to the buried intumescent material causing expansion of this material and the production of a uniform pattern of raised portions of difficulty burnable foam insulating material which retards the flame spread rate.
REFERENCES:
patent: 3454413 (1969-07-01), Miller
patent: 3536574 (1970-10-01), Buckley
patent: 3654044 (1972-04-01), Hirota
patent: 3811992 (1974-05-01), Hanada et al.
patent: 3936541 (1976-02-01), Plowmun et al.
patent: 3969291 (1976-07-01), Fukula et al.
patent: 4024310 (1977-05-01), Wooler et al.
patent: 4068031 (1978-01-01), Cooley et al.
patent: 4086382 (1978-04-01), Hites
Silverman Stanley S.
The Lilly Company
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