Coated, sag-resistant ceiling boards

Details Coated, sag-resistant ceiling boards Coated, sag-resistant ceiling boards

1996-04-01

1998-02-03

Gulakowski, Randy

Coating processes

Application to opposite sides of sheet, web, or strip

4274071, 427412, 428240, 428245, 428262, 428288, 428327, B05D 100, B32B 516

Patent

active

057142009

ABSTRACT:
For sag-resistant ceiling boards, a board has at least two coatings, one on the front face (coating A) of the board and at least one other coating (coating B) on the back face of the ceiling board. Both of these coatings must have an elastic modulus of at least about 400,000 psi to make the board rigid. In addition to this, coating B, on the back face of the board, must have a higher coefficient of humidity expansion than coating A of the front face.

REFERENCES:
patent: 3804706 (1974-04-01), Kurashige et al.
patent: 3856562 (1974-12-01), White et al.
patent: 3954540 (1976-05-01), Chamberlain, III
patent: 4066805 (1978-01-01), Shenk
patent: 4611445 (1986-09-01), Pressley
patent: 4695507 (1987-09-01), Schwartz
patent: 4863979 (1989-09-01), Beyersdorf et al.
patent: 4942085 (1990-07-01), Guerro et al.
patent: 5013598 (1991-05-01), Guerro et al.
patent: 5134179 (1992-07-01), Felegi, Jr. et al.

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