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US 11,952,718 B2Granted
Paperboard and a method of producing a paperboard
AssigneeStora Enso OYJ
InventorsFrank Peng, Kaj Backfolk, Isto Heiskanen, Teija Laukala
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Abstract
The invention discloses a paperboard comprising a base ply, a top ply, and an intermediate layer disposed in-between the at least one base ply and the top ply. The intermediate layer comprises pigment and microfibrillated cellulose (MFC). The application of an intermediate layer comprising pigment and MFC in-between the base ply and the top ply gives rise to improved optical properties of the paperboard, even when using an uncoated top ply having a low grammage This makes it possible to reduce the grammage of the top ply and still obtain good optical properties.
Claims11
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.
1 more element
Dependencies are inferred from the claim text.