Sag resistant, cast acoustical ceiling tile and method for makin

Details Sag resistant, cast acoustical ceiling tile and method for makin Sag resistant, cast acoustical ceiling tile and method for makin

1996-07-23

1998-05-19

Dang, Khanh

Acoustics

Sound-modifying means

Sound absorbing panels

181294, E04B 182

Patent

active

057538719

ABSTRACT:
A sag resistant, cast acoustical ceiling tile which has a mineral wool core and a starch binder and which has a formaldehyde resin impregnated paper backing. A kraft paper backing which has been impregnated with a melamine formaldehyde resin has been found particularly effective in providing sag resistance in high temperature, high humidity conditions such as encountered in Pacific Rim countries. A method has been developed to manufacture the sag resistant, cast acoustical ceiling tile wherein water is applied to the paper backing prior to machining and painting to provide a tile which has a relatively flat initial plane position.

REFERENCES:
patent: 2416447 (1947-02-01), Laughlin et al.
patent: 3183996 (1965-05-01), Capaul
patent: 3202567 (1965-08-01), Muri et al.
patent: 3616144 (1971-10-01), Kenney
patent: 4010817 (1977-03-01), Warren et al.

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