Method of deinking recovered paper

Details Method of deinking recovered paper Method of deinking recovered paper

2008-03-21

2011-10-25

Hug, Eric (Department: 1741)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

C162S005000, C162S008000, C162S189000

Reexamination Certificate

active

08043473

ABSTRACT:
The object of the present invention is to provide a process for producing deinked pulp from recovered paper containing stickies while preventing excessive reduction in the size of stickies, lowering the COD of effluents, and producing deinked pulp with a smaller residual ink content.In the ink detachment stage of the process for producing deinked pulp from recovered paper containing stickies, an anhydride of crystalline layered silicate is added, preferably in an amount of 0.1-1.5 weight % of absolute-dry pulp, and a deinking treatment is performed at a pH of 7.0-9.9. In the present invention, the deinking treatment is performed in a weakly alkaline to neutral region which is generally said to be effective in reducing the amount of stickies but less effective in ink detachment and, yet, deinked pulp having a smaller amount of residual ink can be produced.

REFERENCES:
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JPO machine translation of JP 2004-084088, Mar. 18, 2004.
JPO machine translation of JP 2007-021485, Feb. 1, 2007.
International Search Report for PCT/JP2008/055243, mailed Jun. 10, 2008.
Kanazawa, “Neutral Deinking Technology Benefit & Problems Solution of the Problems by Micro-Floatation, Etc.”, Aikawa Iron Works Co., Ltd., Tappi Journal vol. 49, pp. 121-130, Jan. 1995.

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