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:
Jun. 21, 2022
Filed:
Jan. 18, 2019
Applicant:
Kemira Oyj, Helsinki, FI;
Inventor:
Matti Hietaniemi, Espoo, FI;
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 27/36 (2006.01); D21F 11/04 (2006.01); D21H 17/26 (2006.01); D21H 17/29 (2006.01); D21H 17/42 (2006.01); D21H 17/45 (2006.01); D21H 21/18 (2006.01); D21H 23/28 (2006.01); D21H 23/50 (2006.01); D21H 23/72 (2006.01);
U.S. Cl.
CPC ...
D21H 27/36 (2013.01); D21F 11/04 (2013.01); D21H 17/26 (2013.01); D21H 17/29 (2013.01); D21H 17/42 (2013.01); D21H 17/45 (2013.01); D21H 21/18 (2013.01); D21H 23/28 (2013.01); D21H 23/50 (2013.01); D21H 23/72 (2013.01);
Abstract
A method for manufacturing a multi-layered paperboard is disclosed, which includes at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueous solution of a first strength component in dissolved form including anionic strength polymer and/or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to a fibre stock from which at least one of the fibrous layers joined together is formed.