Patent ID: 8382950
Filing Date: 2013-02-26
Classification: D21H

Abstract:
1. A method of incorporating waste coating in a paper sheet of a papermaking process, the method comprising: providing: i) waste coating from a previous papermaking coating process, ii) filler particles, and iii) a furnish comprising at least cellulose fibers and water, contacting the waste coating and the filler particles to form a mixture, optionally adding a defoamer to the mixture, adding a cationic agent to the mixture, adding a first flocculating agent to the mixture in an amount sufficient to mix uniformly without causing flocculation of the filler and waste coating, the first flocculating agent being a flocculant; adding a second flocculating agent to the mixture after adding the first flocculating agent, in an amount sufficient to initiate flocculation of the filler and waste coating in the presence of the first flocculating agent, the second flocculating agent being of opposite charge to the first flocculating agent, the flocculated mixture of fresh filler and waste coating defining a filler material, optionally, shearing the flocculated mixture of fresh filler and waste coating to provide flocs having the desired particle size, and adding the filler material to the furnish.