The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1981
Filed:
Mar. 27, 1978
Alkibiadis Karnis, Montreal, CA;
John R Wood, Montreal, CA;
Domtar Inc., Montreal, CA;
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.