Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Reexamination Certificate
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.
REFERENCES:
patent: 2424726 (1947-07-01), Wells
patent: 3085756 (1963-04-01), Danforth et al.
patent: 3362691 (1968-01-01), Shilling
patent: 3547357 (1970-12-01), Johnson
patent: 4283275 (1981-08-01), Heinbockel et al.
patent: 4334984 (1982-06-01), Vagac et al.
patent: 4420117 (1983-12-01), Peroutka et al.
patent: 4619736 (1986-10-01), Henricson et al.
patent: 5137599 (1992-08-01), Maxham
patent: 5358637 (1994-10-01), Hutzler et al.
patent: 5377917 (1995-01-01), Wiljan et al.
patent: 5593542 (1997-01-01), Wolfer et al.
patent: 5707488 (1998-01-01), Markham
patent: 5814187 (1998-09-01), Fjallstrom
patent: 6131742 (2000-10-01), Selin
patent: 29 08 660 (1980-09-01), None
patent: 0 570 757 (1993-11-01), None
Smook, Gary A., Handbook for Pulp and Paper Technologists, 2nd ed, Angus Wilde Publications, 1992, pp. 211-212.
Cordray Dennis
Griffin Steven P.
JLR Pulping Systems AB
Young & Thompson
LandOfFree
Production of fiber suspension from waste paper does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Production of fiber suspension from waste paper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of fiber suspension from waste paper will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3761888