Teknologian Tutkimuskeskus Vtt Oy

Stora Enso Oyj

Aalto University Foundation Sr

Tekla Tammelin

Jari Räsänen

Ali Harlin

Tapani Penttinen

Vesa Kunnari

Jaakko Hiltunen

Monika Österberg

Hanne Wikberg

Jari Vartiainen

Arto Salminen

Maria Soledad Peresin

Ulla Hippi

Leena-Sisko Johansson

Tuomas Hänninen

Tero Malm

Jari Raesaenen

Tuomas HÄNNINEN

Soledad Peresin

The present invention relates to a continuous roll-to-roll process for improving the water tolerance of bio-based polymers, in particular cellulose nanofibrils (CNF) films. Furthermore, the invention provides a method, which combines surface modification/functionalization for improving water stability and wet strength, UV/Ozone treatment, corona treatment or plasma activation for purifying and activating the surface and thus increasing the reaction efficiency, and further hydrophobization of the surface of CNF film.

Method for improving the water tolerance of bio-based CNF-films

The present invention concerns a method of preparing a film of nanofibrillated cellulose (NFC) on at least one surface of a support material, wherein the film is applied and spread directly onto a surface of the plastic support material in the form of a suspension of nanofibrillated cellulose, whereby the nanofibrillated cellulose forms a film. Further, the invention concerns a structure containing or consisting of a film of nanofibrillated cellulose prepared using said method.

Method for the preparation of NFC films on supports

The invention relates to a method of treating chemical pulp fibers by a polymerizing hydroxy acid, the fibers thus obtained and the products refined from them. In the method, the hydroxy acid reacts with the reactive groups of the fibers in the presence of a catalyst, forming ester bonds. The following units of the same hydroxy acid are oligomerized and/or polymerized to these grafted acid residues. The fibers thus treated and the products refined thereof endure better processing stages that include drawing and stretching than untreated fibers.

Treatment of fibres to endure processing

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Espoo, Finland

Tekla Tammelin