US 12,152,345 B2
Method for the production of a coated paper, paperboard or film and a coated paper, paperboard or film
Isto Heiskanen, Imatra (FI); Kaj Backfolk, Lappeenranta (FI); Jukka Kankkunen, Imatra (FI); and Antti Veitola, Inkeroinen (FI)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 17/046,410
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Apr. 12, 2019, PCT No. PCT/IB2019/053020
§ 371(c)(1), (2) Date Oct. 9, 2020,
PCT Pub. No. WO2019/198040, PCT Pub. Date Oct. 17, 2019.
Claims priority of application No. 1850414-2 (SE), filed on Apr. 12, 2018.
Prior Publication US 2021/0363701 A1, Nov. 25, 2021
Int. Cl. D21H 19/12 (2006.01); B32B 27/10 (2006.01); B32B 29/06 (2006.01); B32B 37/15 (2006.01); B32B 37/20 (2006.01); D21G 1/00 (2006.01); D21H 11/18 (2006.01); D21H 19/84 (2006.01); D21H 23/56 (2006.01); D21H 23/64 (2006.01)
CPC D21H 19/12 (2013.01) [B32B 27/10 (2013.01); B32B 29/06 (2013.01); B32B 37/153 (2013.01); B32B 37/203 (2013.01); D21G 1/006 (2013.01); D21H 11/18 (2013.01); D21H 19/84 (2013.01); D21H 23/56 (2013.01); D21H 23/64 (2013.01); B32B 2255/12 (2013.01); B32B 2255/26 (2013.01); B32B 2307/5825 (2013.01); B32B 2307/7244 (2013.01); B32B 2317/12 (2013.01); B32B 2553/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for the production of a coated paper, paperboard or film, wherein the method comprises the steps of:
providing a first suspension comprising cellulose fibers, nanocellulose, or a mixture thereof,
applying the first suspension on a substrate to form a fibrous web, wherein the web has a first side and a second side,
providing a second suspension comprising polymers, particles, or a mixture thereof, wherein the second suspension has a Brookfield viscosity above 3000 mPas, measured according to SCAN-P50:84 at room temperature (23° C.) and at a speed of 10 rpm, at a dry content between 4%-40% by weight,
providing at least one calender comprising at least one roll or belt,
applying the second suspension to a surface of the at least one roll or belt thereby forming a coating web, and
conducting said fibrous web through the at least one calender whereby the coating web is applied to the first side of the fibrous web forming the coated paper, paperboard or film.