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:
Dec. 27, 2022
Filed:
May. 18, 2017
Applicant:
Andritz Ag, Graz, AT;
Inventor:
Oleg Shagaev, Vienna, AT;
Assignee:
ANDRITZ AG, Graz, AT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 3/12 (2006.01); D21B 1/02 (2006.01); D21B 1/14 (2006.01); D21D 1/20 (2006.01);
U.S. Cl.
CPC ...
D21B 1/021 (2013.01); D21B 1/14 (2013.01); D21C 3/12 (2013.01); D21D 1/20 (2013.01);
Abstract
A method for producing a fibrous material from lignocellulose from wood, preferably in the form of wood chips. The lignocellulose material is impregnated with a mixture of sodium sulfite and sodium bisulfite and subsequently undergoes a comminution process in a refiner. Additional chemicals from a mixture of sodium sulfite and sodium bisulfite are directly introduced into the refiner, allowing optimal conditions to be set for both additive flows of chemicals such that the process can be operated in an energetically advantageous manner and corrosion and scale formation in the refiner and subsequent aggregates can be prevented as much as possible.