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:
Nov. 04, 2008
Filed:
Mar. 25, 2004
Applicants:
Vidar Snekkenes, Karlstad, SE;
Krister Olsson, Karlstad, SE;
Inventors:
Vidar Snekkenes, Karlstad, SE;
Krister Olsson, Karlstad, SE;
Assignee:
Metso Fiber Karlstad AB, Karlstad, SE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The method is for pre-treatment of chips that are fed to a sulphate cooking process. Through acidification of the chips in an acidic treatment fluid with a subsequent draining of free treatment fluid before subsequent steaming or wet-steaming, a high concentration of free hydrogen ions is established within the chip pieces. When the chips are subsequently formed into slurry with preferably a sulphide-rich alkali cooking fluid, HS is formed locally in the chip pieces which gives a yield-increasing effect in the subsequent cooking step of 1-3%.