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    MULTILAYER FILM COMPRISING HIGHLY REFINED CELLULOSE FIBERS
    145.
    发明公开
    MULTILAYER FILM COMPRISING HIGHLY REFINED CELLULOSE FIBERS 审中-公开

    公开(公告)号：US20230151552A1

    公开(公告)日：2023-05-18

    申请号：US17995445

    申请日：2021-04-14

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Anna Kauppi ,  Jukka Kankkunen

    IPC: D21H27/38 ,  D21H11/18 ,  D21F11/04 ,  D21H21/26

    CPC classification number: D21H27/38 ,  D21H11/18 ,  D21F11/04 ,  D21H21/26

    Abstract: The present invention relates to a method for manufacturing a multilayer film comprising highly refined cellulose fibers, the method comprising the steps of: a) forming a first wet web by applying a first pulp suspension comprising highly refined cellulose fibers on a first wire; b) partially dewatering the first wet web to obtain a first partially dewatered web; c) forming a second wet web by applying a second pulp suspension comprising highly refined cellulose fibers on a second wire; d) partially dewatering the second wet web to obtain a second partially dewatered web; e) joining the first and second partially dewatered web to obtain a multilayer web; and f) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers.

    PROCESS FOR PRODUCTION OF NANO-COATED SUBSTRATE
    146.
    发明申请
    PROCESS FOR PRODUCTION OF NANO-COATED SUBSTRATE 有权

    公开(公告)号：US20230132010A1

    公开(公告)日：2023-04-27

    申请号：US17996939

    申请日：2021-05-06

    Applicant: Stora Enso OYJ

    Inventor： Kaj Backfolk ,  Isto Heiskanen ,  Jukka Kankkunen

    IPC: D21H19/82 ,  D21F1/66 ,  D21H27/10 ,  D21H11/18 ,  D21H19/12 ,  D21H19/08 ,  C23C16/06 ,  C23C16/455 ,  C23C16/02

    Abstract: The present invention is directed to a process for manufacturing a nano-coated pulp-based substrate comprising the steps of: a) providing a suspension comprising pulp, said pulp having Schopper Riegler value of at least 70°; b) using the suspension of step a) to form a wet web; c) dewatering and/or drying the wet web to form a substrate; d) adding a first layer of an acrylic monomer solution comprising less than 2 wt-% water to the surface of the substrate, followed by radiation curing the first layer; e) optionally adding a second layer comprising an acrylic monomer solution to the surface of the cured first layer and radiation curing the second layer; f) providing a nano-coating on the surface of the cured first or second layer such that a nano-coating having a thickness in the range of from 0.1 nm to 100 nm is provided on the substrate.

    Method of manufacturing a film having low oxygen transmission rate values
    148.
    发明授权
    Method of manufacturing a film having low oxygen transmission rate values 有权

    公开(公告)号：US11555275B2

    公开(公告)日：2023-01-17

    申请号：US16614164

    申请日：2018-05-17

    Applicant: Stora Enso OYJ

    Inventor： Esa Saukkonen ,  Isto Heiskanen ,  Katja Lyytikäinen ,  Kaj Backfolk

    IPC: D21H11/18 ,  B32B5/06 ,  B32B23/06 ,  B32B23/08 ,  D21H25/04 ,  B82Y30/00

    Abstract: A method of manufacturing a film having an oxygen transmission rate (OTR) value in the range of 0.1 to 200 cc/m2*24 h at 23° C., 50% relative humidity (RH), and an OTR value in the range of 0.1 to 2000 cc/m2*24 h at 38° C. at 85% RH, comprising at least 60% by weight nanocellulose based on the weight of the total amount of fibers in the film, wherein the method comprises the steps of, providing an aqueous suspension comprising said nanocellulose; forming a web from said aqueous suspension; calendering said web at a line load of at least 40 kN/m, and at a temperature of at least 60° C. wherein said film is formed and said web has an OTR value in the range of 50 to 10 000 cc/m2*24 h at 23° C., 50% RH before said calendering step, or more preferably in the range of 500 to 5000 cc/m2*24 h at 23° C., 50% RH before said calendering step.

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