Stora Enso Oyj

Teija Laukala

Isto Heiskanen

Kaj Backfolk

Lars Axrup

Anna Kauppi

Heidi Saxell

Risto Laitinen

Henri Kastinen

Nina Ruohoniemi

Veikko Jokela

Frank Peng

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.

Paperboard and a method of producing a paperboard

The present invention relates to crystalline and stable amorphous CaCOprecipitated on lignocellulosic fibers.

Precipitated calcium carbonate

A substantially dry composite material comprising a nanofibrillated polysaccharide and two or more additives, wherein the composite nanofibrillated polysaccharide is a microfibrillated cellulose and wherein the additives are lime milk and carbon dioxide, wherein the additives are allowed to react with each other and forming a precipitated calcium carbonate on the nanofibrillated polysaccharide, thereby forming a composite product comprising precipitated calcium carbonate and nanofibrillated polysaccharide.

Substantially dry composite comprising a nanofibrillated polysaccharide

A method for the production of a composite material comprising nanofibrillated polysaccharide, the method comprising the following steps:

Method for forming a subsequently drying a composite comprising a nanofibrillated polysaccharide

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Lappeenranta, Finland

Teija Laukala