Treatment of mechanical pulp to remove resin

Details Treatment of mechanical pulp to remove resin Treatment of mechanical pulp to remove resin

1985-10-15

1990-05-08

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 26, 162 28, 162 37, 162 40, 162 52, 162 55, 162 56, 162 57, 162 71, 162 78, 162 83, 162 84, D21B 104

Patent

active

049229893

ABSTRACT:
Resin is removed from mechanical pulps, such as TMP, CTMP, and the like, in a quick and simple manner. Mechanical pulp at a consistency of about 7-20 percent (preferably 8-15 percent) is subjected to high turbulence. The high turbulence may be effected by fluidizing the pulp, as in a centrifugal fluidizing pump, or otherwise by subjecting it to high turbulence as in a mixer, screen, or disc mill refiner. By subjecting the pulp to high turbulence treatment for a time period of about 0.2-10 seconds, resin removal is greatly enhanced, and in subsequent dewatering of the pulp a pressate is formed which has a higher concentration of resin in the pressate than in pressates produced by conventional processes. After dewatering the pulp is preferably diluted (again to about 7-20 percent consistency), and the turbulence and dewatering steps are repeated. Chemicals to improve deresination can be added to the pulp while it is subjected to high turbulence.

REFERENCES:
patent: 2862784 (1958-12-01), Kise et al.
patent: 3627629 (1971-12-01), Miller
patent: 4339206 (1982-07-01), Ahs
patent: 4444621 (1984-04-01), Lindahl
patent: 4504016 (1985-03-01), Wikdahl
patent: 4596631 (1986-06-01), Prough et al.
Pulp and Paper Manufacture: Vol. I-The Pulping of Wood, Second Ed., McGraw-Hill Book Co., 1969, pp. 726-727.

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