Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With plural or specified mechanical defibering step
Patent
1978-03-27
1981-09-29
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With plural or specified mechanical defibering step
162 55, 209 17, D21B 114
Patent
active
042921228
ABSTRACT:
Process for producing a mechanical pulp of improved linting properties by screening the pulp to provide a through and a retained fraction, fractionating the through fraction by means of a hydrocyclone into at least two fractions one fraction having an average specific surface less than a predetermined value between 1.2 and 4 m.sup.2 /g and the second fraction having an average specific surface greater than the first fraction and subjecting the first fraction to mechanical processing thereby to form a processed fraction having an average specific surface of 4 to 10 m.sup.2 /g and recombining said process fraction and said second fraction into a combined pulp.
The invention also relates to a method of determining specific surface distribution of fibres of the mechanical pulp by fractionating the pulp in a hydrocyclone system into a plurality of underflow fractions and a plurality of overflow fractions each of said underflow and overflow fractions containing a different portion of fibres of said sample and analyzing each of said underflow fractions or of said overflow fractions or both to determine the specific surface of each of said selected underflow or overflow fractions.
REFERENCES:
patent: 3085927 (1963-04-01), Pesch
patent: 3352745 (1967-11-01), Malm
patent: 3372879 (1968-03-01), Jones et al.
patent: 3411720 (1968-11-01), Jones et al.
Karnis Alkibiadis
Wood John R.
Domtar Inc.
Smith William F.
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