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US 5,807,465 AGranted
Granular material containing recycled paper components
AssigneeMarcal Paper Mills, Inc.
InventorsEdward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Life of this patent
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AssigneeMarcal Paper Mills, Inc.
InventorsEdward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Estimating the term…
A process is disclosed which utilizes the "non-papermaking" portion of waste paper to produce a highly absorbent, essentially fiber-free granule which can be used, for example, as an agricultural chemical carrier. The process maximizes the amount of long (papermaking) fiber sent to the paper machine. The waste paper is broken up in a hydropulper, and the pulp stock is screened so that papermaking fibers are retained and sent forward to the papermaking process, and the solid material in the reject stream, such as kaolin clay and inorganic materials pass through a flotation clarifier to separate the solids. The slurry is then dewatered by means of a belt press to form a filter cake. The filter cake then enters a pin mixer where it is broken up into individual granules. The granules are then dried to a solids content of greater than 95%.
An absorbent material comprising irregularly shaped generally spherical granules containing about 50-65% organic solids including cellulose fibers and about 35-50% inorganic solids including kaolin clay and calcium carbonate, and having a substantially uniform density throughout, and wherein the granules have a porous outer surface.
An absorbent material comprising irregularly shaped generally spherical granules containing inorganic fillers, including kaolin clay and containing organic materials, including cellulose fibers;
Dependencies are inferred from the claim text.