Patent ID: 9045605
Filing Date: 2015-06-02
Classification: C08J,C08K,D04H,D21H,Y10T

Abstract:
1. A method of producing a low-dust, fire-retardant cellulose fiber material, comprising: applying a liquid comprising a solvent and at least one fire-retardant material soluble in the solvent to a cellulose source material; allowing the liquid to permeate into the cellulose source material to form a liquid-permeated cellulose material; drying the liquid-permeated cellulose material to remove the solvent, wherein an effective amount of the fire-retardant material remains in the cellulose source material, to form a dried, fire-retardant cellulose material; reducing the dried, fire-retardant cellulose material in size to produce a reduced-size, dry fire-retardant cellulose fiber material comprising cellulosic dust material comprising the fire retardant material absorbed in and adhered to the dust material; and removing a major amount of said dust material from the reduced size, dry fire-retardant cellulose fiber material by screening the cellulose fiber material to produce the low-dust, fire-retardant cellulose fiber material, wherein the entirety of the screened cellulose fiber material and the dust material comprise a higher amount of the fire retardant material than solely the screened cellulose fiber material, and the entirety of the screened cellulose fiber material and the dust material has about the same level of fire retardant properties as only the screened cellulose fiber material to meet federal standards for fire-retardant insulation material.