	US 11,724,284 B2
	Method of manufacturing a film comprising microfibrillated cellulose
Lars Axrup, Hammarö (SE); Isabel Knöös, Säffle (SE); Christian Aulin, Stockholm (SE); Magnus Hillergren, Solna (SE); Tom Lindström, Sollentuna (SE); and Göran Ström, Stockholm (SE)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 16/481,688
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Jan. 30, 2018, PCT No. PCT/IB2018/050551 § 371(c)(1), (2) Date Jul. 29, 2019, PCT Pub. No. WO2018/138702, PCT Pub. Date Aug. 2, 2018.
Claims priority of application No. 1750069-5 (SE), filed on Jan. 30, 2017.
Prior Publication US 2020/0023409 A1, Jan. 23, 2020
Int. Cl. D21H 11/18 (2006.01); D21H 21/14 (2006.01); D21H 23/50 (2006.01); B05D 7/04 (2006.01); B05D 1/02 (2006.01); B05D 1/30 (2006.01); B05D 1/38 (2006.01); B05D 7/00 (2006.01); C08J 5/18 (2006.01); C09D 101/02 (2006.01)

CPC B05D 7/04 (2013.01) [B05D 1/02 (2013.01); B05D 1/30 (2013.01); B05D 1/38 (2013.01); B05D 7/534 (2013.01); C08J 5/18 (2013.01); C09D 101/02 (2013.01)]

18 Claims

1. A method of manufacturing a fibrous, oxygen barrier film comprising the steps of:

providing at least a first and a second suspension each comprising microfibrillated cellulose (MFC) in an amount of at least 50 wt % calculated on the total solids content of said suspension,

applying said first suspension on a non-porous substrate to form a first web,

drying said first web to a solids content of at least 50 wt % in an intermediate drying step,

applying said second suspension comprising microfibrillated cellulose (MFC) onto the surface of said dried first web to form a second web,

drying the web, comprising said first and second web, in a final drying step to form a film having a basis weight of less than 40 g/m²and an Oxygen Transmission Rate (OTR) value of below 10 ml/m²/per 24 h at 50% RH.