A METHOD OF MANUFACTURING A FILM HAVING LOW OXYGEN TRANSMISSION RATE VALUES

摘要

a method of making a film having an oxygen transmission rate (otr) value in the range of 0.1 to 200 cm³ / m² * 24h at 23 ° c, 50% relative humidity (ur) and an otr value at range from 0.1 to 2000 cm³ / m² * 24h at 38 ° c in 85% of ur, comprising at least 60% by weight of nanocellulose based on the weight of the total amount of fibers in the film, where the method comprises the steps providing an aqueous suspension comprising said nanocellulose; forming a screen from said aqueous suspension; calendering said screen at a line load of at least 40 kn / m, and at a temperature of at least 60 ° c, in which said film is formed and said screen has an otr value in the range of 50 to 10000 cm³ / m² * 24h at 23 ° c, 50% of ur, before said calendering step, or more preferably in the range of 500 to 5000 cm³ / m² * 24h at 23 ° c, 50% of ur, before said step of calendering.