Stora Enso Oyj

Upm-kymmene Corporation

Kemira Oyj

Erkki Hellen

Matti Hietaniemi

Mikko Virtanen

Hans-Peter Hentze

Tuomo Hjelt

Jaakko Hiltunen

Antti Korpela

Jenni Sievanen

John Kettle

Artem Kulachenko

Jukka Ketoja

Eila Turunen

Katariina Torvinen

Asko Sneck

Terhi Saari

The present invention relates to a method for providing a pretreated filler composition for use in paper and board manufacturing including the steps of: a) providing a filler comprising precipitated calcium carbonate, said filler being in the form of a slurry comprising no additives; b) providing at least one polymer selected from polyvinylamine or polyacrylic amide, said polymer having a charge density of an absolute value of at most 4 meq/g determined at pH 7; c) combining said at least one polymer of step b) with the filler of step a); d) providing a slurry of nanofibrillar cellulose; e) combining said nanofibrillar cellulose slurry with the formed combination of step c) and forming a pretreated filler composition comprising aggregates. Further it also relates to a pretreated filler composition prepared therefrom, and its use in stocks, paper and paper board.

Method for providing a pretreated filler composition and its use in paper and board manufacturing

The invention relates to a method for manufacturing nanostructured paper or board and a novel paper or board. The method comprises providing a liquid suspension of nanocellulose-containing material, forming a web from the suspension, and drying the web in order to form paper or board. According to the invention the water content of the suspension from which the web is formed is 50% or less by weight of liquids. By means of the invention, energy consumption of paper manufacturing can be significantly reduced.

Method of manufacturing paper and products obtained by the method

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Vtt, Finland

Erkki Hellen