Dyed particulate or granular materials from recycled paper and process for making the materials
AssigneeMarcal Paper Mills, Inc.
InventorsKim A. Smith, Edward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Life of this patent
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Abstract
In a process for making a particulate or granular material from a reject stream from a coated grade waste paper pulp stock recycling process, fibers for use in making paper are removed, the remaining solid material in the reject stream is dyed and then separated. Water is removed from the reject stream to increase its consistency and form dyed particles or granules. The process and characteristics of particulate and granular material formed by the process are described.
Claims27
A process for dyeing granular material made from waste paper containing kaolin clay, cellulosic material, and other solid components, comprising the steps of:
- (a) forming a slurry from waste paper containing kaolin clay, cellulosic material, and other solid components;
- (b) removing fibers for papermaking from the slurry;
- (c) adding dye to the slurry;
- (d) adding a flocculating polymer to the slurry containing said dye;
- (e) clarifying the slurry to produce a concentrated stream of solid components and dye;
- (f) de-watering the concentrated stream to produce a filter cake;
- and
- (g) breaking up the filter cake to produce a granular material.
A process for dyeing absorbent materials comprising:
- (a) forming a slurry containing water, cellulosic material and kaolin clay;
- (b) adding dye to the slurry;
- (c) adding a flocculating polymer to the slurry;
- (d) clarifying the slurry to produce a concentrated stream of solid components;
- (e) dewatering the concentrated stream of solid components to produce a filter cake;
- and
- (f) forming the filter cake into absorbent materials, whereby the absorbent materials have a desired color.
A process for producing granular materials of a predetermined color by neutralizing the color of a dye used to produce colored paper in a papermaking machine comprising:
- (a) forming a slurry containing water, cellulosic material and kaolin clay and having a first color;
- (b) supplying papermaking fibers from the slurry to a papermaking machine;
- (c) adding a dye of a second color to the papermaking fibers before the papermaking fibers are made into paper in the papermaking machine;
- (d) removing an aqueous slurry of suspended solids having the second color from the papermaking machine;
- (e) adding a dye of a third color to the slurry of suspended solids to neutralize the color of the dye of the second color used to produce the colored paper;
- (f) adding a flocculating polymer to the slurry of suspended solids;
- (g) clarifyiing the slurry of suspended solids to produce a concentrated stream of solid components;
- (h) de-watering the concentrated stream of solid components to produce a filter cake having said first color;
- and
- (i) forming the filter cake into granular materials.
Dependencies are inferred from the claim text.