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:
Oct. 29, 2019
Filed:
Jun. 24, 2015
Applicant:
Billerudkorsnäs Ab, Solna, SE;
Inventors:
Assignee:
BILLERUDKORSNÄS AB, Solna, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 27/10 (2006.01); D21H 17/28 (2006.01); D21H 17/29 (2006.01); D21H 17/44 (2006.01); D21H 19/20 (2006.01); D21H 19/44 (2006.01); D21H 19/82 (2006.01); D21H 21/16 (2006.01); D21H 21/18 (2006.01); B31F 1/12 (2006.01); C04B 28/04 (2006.01); C04B 40/00 (2006.01); D21H 19/40 (2006.01); B65D 30/24 (2006.01); B65D 30/08 (2006.01);
U.S. Cl.
CPC ...
D21H 27/10 (2013.01); B31F 1/126 (2013.01); B65D 31/04 (2013.01); B65D 31/14 (2013.01); C04B 28/04 (2013.01); C04B 40/0039 (2013.01); D21H 17/28 (2013.01); D21H 17/29 (2013.01); D21H 17/44 (2013.01); D21H 19/20 (2013.01); D21H 19/40 (2013.01); D21H 19/44 (2013.01); D21H 19/82 (2013.01); D21H 19/828 (2013.01); D21H 21/16 (2013.01); D21H 21/18 (2013.01); Y02W 90/11 (2015.05);
Abstract
There is provided a method of making white sack paper having a grammage of 50-140 g/m2 and a Gurley porosity (ISO 5636/5) of 2-10 s, comprising the steps of: a) providing bleached pulp, such as bleached sulphate pulp; b) subjecting the pulp to high consistency (HC) refining and optionally low consistency (LC) refining to the extent that the sack paper obtains the Gurley porosity; c) adding cationic polymer, such as cationic starch, to the pulp in an amount of 1.5-5.0 kg/ton paper; and d) adding size to the pulp in an amount of 0.4-2.0 kg/ton paper; and e) forming the sack paper from the pulp, wherein less than 2 kg/ton paper of anionic starch is added to the pulp.