METHOD FOR PRODUCING DEINKED PULP AND ADDITIVE FOR PRODUCING DEINKED PULP

Japanese Patent JP2006037290

A

To recover the ash content including fillers from the pulp slurry at the deinking process in high yield and utilizes the ash content effectively.

In the method for producing deinked pulp by adding an additive for producing deinked pulp to the pulp slurry at the deinking step, the additive for producing deinked pulp is a water-soluble amphoteric copolymer from (a) (meth)acrylamide, (b) a cationic monomer and (c) an anionic monomer having a weight-average molecular weight of 500,000 to 10,000,000. The additive is added after the flotation step and before the dewatering step for the pulp slurry from which the ink is removed. As the water-soluble amphoteric copolymer having a proper size of molecular weight is added after the flotation step, it can strongly be aggregated to pulp fiber correspondingly to the filler having all kinds of charging whereby the filler originating from the used paper can be fed to the papermaking step in high yield.

JP6782697	Methods and equipment for cleaning fibrous material suspensions by flotation
JP2003517520	INDUSTRIAL APPLICABILITY: A method for removing wax from pulp paper materials.
JPH0665793	[Title of Invention] Method for processing waste paper

FUJIWARA TAKAHIRO
NAKADA TOMOHIKO
HASHIGUCHI YOSHIHARU

JP2004221108A

February 09, 2006

July 29, 2004

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HARIMA CHEMICALS INC

D21C5/02

JP2004091956A	2004-03-25
JP2002138380A	2002-05-14
JP2001020198A	2001-01-23
JPH07188351A	1995-07-25
JP2003293277A	2003-10-15
JP2003155689A	2003-05-30

Hirotaka Toyonaga

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