Method for producing improved high-yield pulps

Details Method for producing improved high-yield pulps Method for producing improved high-yield pulps

1985-02-20

1990-07-03

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162149, D21D 502

Patent

active

049388436

ABSTRACT:
Improved chemimechanical, particularly chemithermomechanical, pulp (CTMP), is produced by defibrating or refining wood chips to produce pulp, and then screening the pulp and separating out at least 30% by weight of the incoming fiber suspension as a first long-fiber fraction, and also separating out a first fine-fiber fraction, screening the first fine fiber fraction a second time, and separating out a second long-fiber fraction which is combined with the first long-fiber fraction to form a long-fiber fraction of improved properties, and a second fine-fiber fraction of improved properties.

REFERENCES:
patent: 4029543 (1977-06-01), Lindahl
patent: 4247363 (1981-01-01), Soma et al.
patent: 4444621 (1984-04-01), Lindahl
patent: 4502918 (1985-03-01), Mackie et al.
Jackson et al., "Factors Limiting the Strength Characteristics of Thermomechanical Pulp", Transactions, (Sep. 1980), pp. 65-72.

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