Production of fiber suspension from waste paper

Details Production of fiber suspension from waste paper Production of fiber suspension from waste paper

2007-01-16

2007-01-16

Griffin, Steven P. (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

C162S055000, C162S261000, C241S024100, C241S028000, C241S068000

Reexamination Certificate

active

10475660

ABSTRACT:
A fiber suspension is produced from waste paper by first filling a pulper with a batch of the waste paper. The pulper is operated to partly defibrate the batch of waste paper substantially without disintegrating coarse imputities into finer impurities. The partly defibrated batch of waste paper is separated into a coarse reject fraction and an initial fiber suspension containing some waste paper fragments and fine impurities. The initial fiber suspension is pumped through a rotary screen apparatus provided with a tubulat fine screen and a pulper type impeller rotating coaxial with the tubular screen, but devoid of any impeller co-operant extraction plate, to defibrate waste paper fragments remaining in the initial fiber suspension and to separate the initial fiber suspension by means of the tubular fine screen into a fine reject fraction containing fine inpurities and a complete fiber suspension substantially free from impurities.

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Smook, Gary A., Handbook for Pulp and Paper Technologists, 2nd ed, Angus Wilde Publications, 1992, pp. 211-212.

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