Method and an Apparatus for Producing Nanocellulose

Tomas Björkqvist (Inventor), Helmer Gustafsson (Inventor), Timo Koskinen (Inventor), Markus Nuopponen (Inventor), Annikki Vehniäinen (Inventor), Sirkka Gustafsson (Inventor)

    Research output: Patent


    Described herein is nanocellulose produced by introducing a mixture of cellulose based fiber raw material and water through a refining gap, having a width smaller than 0.1 mm. In the refining gap, the fiber raw material is subjected to processing forces varying in the direction of introducing said mixture, by means of refining zones provided in the gap one after each other in the feeding direction, whereby the refining surfaces differ in surface patterning and/or surface roughness. The mixture of fiber raw material and water is guided past the refining surfaces in the feeding direction to different locations in the refining zone by by-pass channels provided in the stator. The width of the refining gap is maintained by the combined effect of the feeding pressure of the mixture of fiber raw material and water fed into the refining gap and the axial force of the rotor.

    Original languageEnglish
    Patent numberUS8945346
    IPCD21B 1/ 12 A I
    Priority date31/12/10
    Publication statusPublished - 3 Feb 2015
    Publication typeH1 Granted patent


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