Method for retaining textured surface of pressed ceiling board

Details Method for retaining textured surface of pressed ceiling board Method for retaining textured surface of pressed ceiling board

1979-09-20

1981-04-21

Ball, Michael W.

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162222, 162225, 264119, D21H 502

Patent

active

042630932

ABSTRACT:
A low-cost mineral-fiber board having a natural-appearing highly textured surface, and improved uniformity of density is produced by coating the wet-textured surface of a perlite-containing mineral-fiber mat to a depth at least equal to the peak height of the texture with a layer of silicone-coated perlite prior to press-forming the board. The perlite layer fills the voids on the textured surface and provides a buffer layer between the board and press roll, enabling uniform pressure to be applied to the board without disturbing the textured surface. The top perlite layer may be removed by vacuum units before or after drying the board.

REFERENCES:
patent: 2268262 (1941-12-01), Miller
patent: 2431720 (1947-12-01), Willey
patent: 2445210 (1948-07-01), Colton
patent: 3639200 (1972-02-01), Elmendorf

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