Wet process and apparatus for rendering cellulosic insulation pa

Details Wet process and apparatus for rendering cellulosic insulation pa Wet process and apparatus for rendering cellulosic insulation pa

1980-09-02

1983-05-31

Silverberg, Sam

Coating processes

Particles, flakes, or granules coated or encapsulated

252 62, 252607, 428921, 427377, 427335, 106 1811, 106 1813, E04B 174

Patent

active

043861199

ABSTRACT:
Particulate cellulose insulation material is rendered fire retardant by a wet process requiring considerably less fire retardant composition than normally employed in the usual dry processes or in wet processes proposed heretofore, and yielding a product with significantly enhanced insulating properties. Impregnation of a cellulosic insulating material, such as waste paper in finely divided form, with an aqueous solution of a non-hygroscopic fire retardant composition, such as boric acid, a borate, or the composition of U.S. Pat. No. 3,983,040, is carried out under conditions whereby a minimum amount of water is first utilized for the purpose of dissolving the fire retardant composition and to serve as a carrier in distributing it throughout the cellulosic insulating material. For example, only from about 14 to 45% by weight of add-on water is utilized in the presence of from about 5 to 10% by weight of the fire retardant composition and preferably in the presence of a surfactant. The so-treated insulation material is then maintained in a hot and humid atmosphere, as in a closed conditioning bin, for a prolonged period of time prior to drying.

REFERENCES:
patent: 3259104 (1966-07-01), Gerber
patent: 3666544 (1972-05-01), Kuechler
patent: 4012507 (1977-03-01), Knoepfler

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