| 摘要 |
<p>375,978. De-inking printed paper. BROWN, F. A., 713, Columbia Street, New Westminster, British Columbia, Canada. June 9, 1931. No. 16783. [Class 96.] Printed paper is freed from ink by macerating it in an aqueous solution containing a chemical reagent, e.g. sodium metasilicate which breaks down the ink to a state of high division and containing an alcoholic constituent, e.g. glycerine, which disperses the ink particles, emulsifies the ink binder and the solution, the resultant pulp being washed, e.g. with the aid of a screen through which the pigment &c. passes, or the pigment &c. is allowed to settle. With oiled or waxed papers, the solution may contain a reagent, e.g. carbon tetrachloride or other chlorine derivative of methane, which cuts the oil or wax. In an example 800 lbs. of newspaper is de-inked by pulping in a beating-engine for 45 mins. at atmospheric temperature in a solution of 9 lbs. sodium metasilicate and 7 lbs. glycerine in 1000 gal. water.</p> |
