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    Method for providing a substrate with a barrier and a substrate comprising a barrier
    75.
    发明专利
    Method for providing a substrate with a barrier and a substrate comprising a barrier 未知

    公开(公告)号：NZ601742A

    公开(公告)日：2014-12-24

    申请号：NZ60174211

    申请日：2011-03-18

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  BACKFOLK KAJ

    IPC: B32B29/02 ,  B32B5/26 ,  B32B27/10 ,  D01D5/00 ,  D21H19/10

    Abstract: Disclosed is a method for providing a surface of a fibre based substrate comprising cellulosic fibres (wherein preferably the fibre based substrate is paper or paperboard) with a barrier layer (the barrier being a barrier against liquid, vapour, oil, solvents, heat, uv-light, aroma and/or gas) which barrier layer is formed as a film by depositing polymer nanofibres on the surface by the use of electrospinning or meltspinning, wherein the film is formed by post treating the substrate by increasing the temperature after depositing the polymer nanofibres on the surface, and wherein the temperature is increased to or above the melting temperature of the deposited nanofibres, preferably the nanofibres are formed by electrospinning or meltspinning a polymer, such as polyvinyl alcohol, varnish, polystyrene, polybutadiene, polyurethanes, polyethylene dispersions, polypropylene, PLA, chitosan, starch, sodium carboxymethyl cellulose, acrylate copolymers, polyvinyl acetate, polyethylene oxide, polyethylene dispersions, polyethylene, terephthalate dispersions, mixtures or its modified analogues of any of the mentioned components. Further disclosed is a fibre based substrate which comprises a fibre base layer comprising cellulosic fibres and a barrier layer, wherein the barrier layer is a film formed by depositing polymer nanofibres on a surface of the base layer by the use of electrospinning or meltspinning, and wherein the film is formed by post treating the substrate by increasing the temperature after the depositing of the polymer nanofibers on the surface, and wherein the temperature is increased to or above the melting temperature of the deposited nanofibers.

    PROCESS FOR TREATING CELLULOSE AND CELLULOSE TREATED ACCORDING TO THE PROCESS
    76.
    发明专利
    PROCESS FOR TREATING CELLULOSE AND CELLULOSE TREATED ACCORDING TO THE PROCESS 未知

    公开(公告)号：ZA201308337B

    公开(公告)日：2014-12-23

    申请号：ZA201308337

    申请日：2013-11-06

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  KOTILAINEN ARI ,  SIDARAVICIUS JONAS ,  BACKFOLK KAJ ,  GAIDELIS VALENTAS

    IPC: B01D20060101 ,  D21C20060101 ,  D21H20060101

    Abstract: The present invention relates to a process for purifying a slurry comprising cellulose, such as microfibrillated cellulose, wherein the process comprises the following steps: —providing a slurry comprising cellulose and liquid, —subjecting the slurry to an electric field inducing the liquid of the slurry to flow, —separating the liquid from the cellulose thus obtaining a liquid depleted slurry, —adding a washing liquid, such as an organic solvent, to the liquid depleted slurry—subjecting the liquid depleted slurry to an electric field inducing the washing liquid of the slurry to flow and—separating the washing liquid from the cellulose, thus obtaining a purified cellulose. The invention also relates to cellulose such as microfibrillated cellulose obtainable from said process.

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