The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1994
Filed:
Aug. 06, 1992
Larry D Markham, Mobile, AL (US);
Narendta R Srivatsa, Tuxedo, NY (US);
International Paper Company, Purchase, NY (US);
Abstract
A method for removing ink from printed paper to be recycled by pulping the printed paper to be recycled with water to produce a paper pulp slurry with a consistency of between about 1% and about 20%, adjusting the pH of the paper pulp slurry to between about 6 and about 13, maintaining the paper pulp slurry at a temperature of between about 30.degree. C. and about 100.degree. C., adding an agglomerating agent to the paper pulp slurry, pulping the paper pulp slurry for a period of between about 5 min. and about 90 min., such that the ink particles agglomerate, thereafter, adding between about 0.2 wt. % and about 2.0 wt. %, based on the dry weight of the pulp, of talc to the paper pulp slurry, and thereafter, removing the agglomerated ink particles from the paper pulp slurry.