	US 11,952,718 B2
	Paperboard and a method of producing a paperboard
Frank Peng, Hammarö (SE); Kaj Backfolk, Villmanstrand (FI); Isto Heiskanen, Imatra (FI); and Teija Laukala, Lappeenranta (FI)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 17/417,882
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Jan. 23, 2020, PCT No. PCT/IB2020/050509 § 371(c)(1), (2) Date Jun. 24, 2021, PCT Pub. No. WO2020/157609, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 1950097-4 (SE), filed on Jan. 28, 2019.
Prior Publication US 2022/0074144 A1, Mar. 10, 2022
Int. Cl. D21H 11/18 (2006.01); D21H 17/67 (2006.01); D21H 19/52 (2006.01); D21H 23/28 (2006.01); D21H 23/48 (2006.01); D21H 23/50 (2006.01); D21H 27/10 (2006.01); D21H 27/32 (2006.01); D21H 27/38 (2006.01); D21H 27/40 (2006.01)

CPC D21H 11/18 (2013.01) [D21H 17/67 (2013.01); D21H 19/52 (2013.01); D21H 23/28 (2013.01); D21H 23/48 (2013.01); D21H 23/50 (2013.01); D21H 27/10 (2013.01); D21H 27/32 (2013.01); D21H 27/38 (2013.01); D21H 27/40 (2013.01)]

11 Claims

1. A linerboard comprising:

at least one base ply, a top ply, and an intermediate layer applied in-between the at least one base ply and said top ply, wherein the at least one base ply and the top ply are paperboard plies comprising at least 50 wt % cellulose fibers calculated on a total weight of said ply

wherein the intermediate layer comprises microfibrillated cellulose (MFC) in an amount of 30-90 wt % and pigment in an amount of 10-70 wt % as calculated on a total weight of said intermediate layer,

wherein the pigment comprises precipitated calcium carbonate (PCC),

wherein said pigment comprises pigment particles wherein 85% by volume of said pigment particles have a diameter of less than 5 μm.