Patent ID: 7534322
Filing Date: 2009-05-19
Classification: D21B,Y02W

Abstract:
1. A method of deinking recycled cellulosic fibers having ink associated therewith comprising the steps of: a. producing a pulp from the recycled cellulosic fibers, said pulp comprising cellulosic fibers, ink particles and an agglomeration agent, b. after producing said pulp, subjecting said pulp to a screening and two or three cyclonic cleaning treatments which develops a filtrate including paper fibers and ink particulates having a Tappi dirt count of less than 200 ppm, c. after said subjecting step, storing said filtrate in a vessel for a period of time ranging from about ½ hour to about 24 hours to alter the geometry of ink particles in said filtrate, and; d. directly after the storing step, withdrawing said filtrate from said vessel and transferring said filtrate to one more cyclonic cleaning treatment wherein said filtrate is depleted of ink particles to produce a useful papermaking pulp.