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:
Jan. 17, 2023
Filed:
May. 17, 2018
Stora Enso Oyj, Helsinki, FI;
Esa Saukkonen, Lappeenranta, FI;
Isto Heiskanen, Imatra, FI;
Katja Lyytikäinen, Imatra, FI;
Kaj Backfolk, Lappeenranta, FI;
Stora Enso OYJ, Helsinki, FI;
Abstract
A method of manufacturing a film having an oxygen transmission rate (OTR) value in the range of 0.1 to 200 cc/m*24 h at 23° C., 50% relative humidity (RH), and an OTR value in the range of 0.1 to 2000 cc/m*24 h at 38° C. at 85% RH, comprising at least 60% by weight nanocellulose based on the weight of the total amount of fibers in the film, wherein the method comprises the steps of, providing an aqueous suspension comprising said nanocellulose; forming a web from said aqueous suspension; calendering said web at a line load of at least 40 kN/m, and at a temperature of at least 60° C. wherein said film is formed and said web has an OTR value in the range of 50 to 10 000 cc/m*24 h at 23° C., 50% RH before said calendering step, or more preferably in the range of 500 to 5000 cc/m*24 h at 23° C., 50% RH before said calendering step.