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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.:

US 12258710 B1

PDFFull Text
Date of Patent:
Mar. 25, 2025

Filed:

Apr. 14, 2021

Multilayer film comprising highly refined cellulose fibers

Applicant:

Stora Enso Oyj, Helsinki, FI;

Inventors:

Isto Heiskanen, Imatra, FI;

Kaj Backfolk, Lappeenranta, FI;

Katja Lyytikäinen, Imatra, FI;

Jukka Kankkunen, Imatra, FI;

Assignee:

Stora Enso OYJ, Helsinki, FI;

Attorney:

Greer, Burns & Crain, Ltd.

Primary Examiner:

Jose A Fortuna

Int. Cl.
CPC ...
D21F 11/04 (2006.01); B32B 3/26 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01); B32B 7/12 (2006.01); B32B 37/12 (2006.01); D21H 11/18 (2006.01); D21H 19/34 (2006.01); D21H 23/24 (2006.01); D21H 23/48 (2006.01); D21H 23/50 (2006.01); D21H 27/36 (2006.01);
U.S. Cl.
CPC ...
D21F 11/04 (2013.01); B32B 3/266 (2013.01); B32B 5/02 (2013.01); B32B 5/26 (2013.01); B32B 7/12 (2013.01); B32B 37/1284 (2013.01); D21H 11/18 (2013.01); D21H 19/34 (2013.01); D21H 23/24 (2013.01); D21H 23/48 (2013.01); D21H 23/50 (2013.01); D21H 27/36 (2013.01); B32B 2250/20 (2013.01); B32B 2250/40 (2013.01); B32B 2255/02 (2013.01); B32B 2255/26 (2013.01); B32B 2262/062 (2013.01); B32B 2307/412 (2013.01); B32B 2307/414 (2013.01); B32B 2307/718 (2013.01); B32B 2307/724 (2013.01);
Abstract

The present invention relates to a method for manufacturing a multilayer film comprising highly refined cellulose fibers, the method comprising the steps of: a) forming a first wet web by applying a first pulp suspension comprising highly refined cellulose fibers on a first wire; b) partially dewatering the first wet web to obtain a first partially dewatered web; c) forming a second wet web by applying a second pulp suspension comprising highly refined cellulose fibers on a second wire; d) partially dewatering the second wet web to obtain a second partially dewatered web; e) applying a binder between the first and second partially dewatered web and joining the first and second partially dewatered web to obtain a multilayer web; and f) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers.

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