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:
May. 06, 2025
Filed:
Dec. 18, 2020
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Assignee:
[object Object];
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 21/36 (2005.12); D21C 5/00 (2005.12); D21C 9/16 (2005.12); D21D 5/28 (2005.12);
U.S. Cl.
CPC ...
D21H 21/36 (2012.12); D21C 5/005 (2012.12); D21C 9/163 (2012.12); D21D 5/28 (2012.12);
Abstract
The present invention relates to a process for manufacturing a fibre web, such as paper, board, tissue or the like. In the process bleached cellulose-containing fibres are suspended into process water in order to prepare a fibre stock, which comprises residual hydrogen peroxide. The process comprises at least one pulp storage tower through which the fibre stock is transferred before it is formed into a fibrous web and dried. Zinc ions are introduced to the fibre stock or one of its constituents to maintain the amount of residual hydrogen peroxide in the fibre stock at or above a predetermined threshold level after at least one pulp storage tower.