Drainage characteristics of mechanical pulp

Details Drainage characteristics of mechanical pulp Drainage characteristics of mechanical pulp

1986-03-19

1988-03-15

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162 55, 162 24, 162 28, 162 78, D21C 300, D21C 908, D21B 116

Patent

active

047311606

ABSTRACT:
A method and apparatus provide for the bleaching of mechanical pulp in such a way that the brightness of the mechanical pulp can be increased up to about 7-10 points. Mechanical pulp directly from a secondary refiner is separated, as by first and second centrifugal separators (cyclones), into a fines fraction and a fiber fraction. The fines fraction is under about 200 mesh. The fiber fraction is mixed with hydrogen peroxide (H.sub.2 O.sub.2) and subjected to displacement bleaching, which uses a minimum about of bleaching chemical to obtain the maximum brightness. The fines fraction is mixed with hydrogen peroxide and subjected to non-displacement bleaching. The fines fraction is between about 10-20 percent of the total feed pulp stream. After bleaching, the fines and fiber streams can be recombined before passage to a paper products production machines.

REFERENCES:
patent: 3016324 (1962-01-01), Textor
patent: 4029543 (1977-06-01), Lindahl
patent: 4160693 (1979-07-01), Lindahl et al.
patent: 4294653 (1981-10-01), Lindahl et al.
patent: 4502918 (1985-03-01), Mackie et al.
patent: 4606789 (1986-08-01), Reinhall
Lindholm et al., No. 11, 1978, Paperi ja Puu--Papper och Tra, "Modification of Groundwood Pulp Through Chemical Treatment of the Coarse Fibre Fraction."
Britt, Handbook of Pulp and Paper Technology, 2nd ed., Van Nostrand Reinhold Company, 1970, pp. 315-321.

Affiliated with

Also associated with

Rating

Drainage characteristics of mechanical pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drainage characteristics of mechanical pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drainage characteristics of mechanical pulp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1925247