Methods for producing recycled pulp and methods for...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

Reexamination Certificate

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Details

C162S021000, C162S052000, C241S021000

Reexamination Certificate

active

07727355

ABSTRACT:
The present invention aims to produce high-quality recycled pulp with little damage to fibers, high brightness and low residual ink by means of a force selectively acting on fiber surfaces during the process of recycling waste paper. Moreover, fiber surfaces are modified by means of a force acting on only the fiber surfaces to obtain high-quality pulp and to render harmless dirts deteriorating pulp quality.A method for producing recycled pulp characterized in that cavitation is generated and used to strip contaminants deposited on fibers and ash during the process of recycling waste paper. Contaminants such as ink deposited on fibers and ash are stripped/fragmented by means of the impact force induced by collapse of fine bubbles by actively introducing bubbles generated by cavitation into a pulp suspension. A jet system having one or more nozzles for jetting an aqueous slurry containing a material comprising cellulose into a vessel.

REFERENCES:
patent: 3834982 (1974-09-01), Solonitsyn et al.
patent: 7264182 (2007-09-01), Richter et al.
patent: 1170387 (2002-01-01), None
patent: 61-201093 (1986-09-01), None
patent: 1-213491 (1989-08-01), None
patent: 01-250487 (1989-10-01), None
patent: 3-199478 (1991-08-01), None
patent: 6-57670 (1994-03-01), None
patent: 7-18109 (1995-03-01), None
patent: 7-18109 (1995-03-01), None
patent: 720085 (1980-03-01), None
patent: 1659556 (1991-08-01), None
Derwent, Derwent English Summary of SU 720085, 2008, Derwent Information LTD, whole summary.
Smook, Handbook for Pulp and Paper Technologists, 1992, Angus Wilde Publications, 2nd edition, 113-116, 209-219,355-361.
English translation of Soviet Patent 720085, Mar. 1980.

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