Wet processing apparatus for rendering cellulosic insulation par

Details Wet processing apparatus for rendering cellulosic insulation par Wet processing apparatus for rendering cellulosic insulation par

1983-02-25

1984-06-19

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Including means applying fluid to material

241 60, 241152A, B02C 1912

Patent

active

044549920

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: 2118252 (1938-05-01), Kraft
patent: 2148447 (1939-02-01), Dundas et al.
patent: 3491673 (1976-02-01), Lausch
patent: 3666544 (1972-05-01), Kuechler
patent: 4012507 (1977-03-01), Knoepfler et al.

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