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    Method for forming a film comprising nanocellulose
    122.
    发明授权
    Method for forming a film comprising nanocellulose 有权

    公开(公告)号：US11518858B2

    公开(公告)日：2022-12-06

    申请号：US16345994

    申请日：2017-10-31

    Applicant: Stora Enso OYJ

    Inventor： Esa Saukkonen ,  Isto Heiskanen ,  Kaj Backfolk ,  Ville Ribu

    IPC: C08J5/18 ,  D21H11/18 ,  D21H25/04 ,  C09D101/02 ,  B32B29/02 ,  D21H19/34 ,  D21H19/22

    Abstract: A method of forming a film comprising nanocellulose having an Oxygen Transmission Rate (OTR) value in the range of 0.1 to 300 cc/m2/24 h at 38° C. and 85% relative humidity (RH), and having a basis weight in the range of in the range of 0.1 to 45 g/m2 wherein the method comprises the steps of; providing a suspension comprising nanocellulose, forming at least one layer of a web or a film from said suspension; drying said formed web or film to a dry content of at least 65 weight-%, wherein said method further comprises the steps of; treating at least one side of said dewatered and dried web or film with ultra violet (UV) or electron beam (EB) irradiation; and wherein at least one cooling step is provided in connection with or after the UV or EB treatment step.

    A METHOD TO PRODUCE A FIBROUS PRODUCT COMPRISING MICROFIBRILLATED CELLULOSE
    123.
    发明申请
    A METHOD TO PRODUCE A FIBROUS PRODUCT COMPRISING MICROFIBRILLATED CELLULOSE 有权

    公开(公告)号：US20220235201A1

    公开(公告)日：2022-07-28

    申请号：US17596530

    申请日：2020-06-15

    Applicant: Stora Enso OYJ

    Inventor： Kaj Backfolk ,  Isto Heiskanen ,  Katja Lyytikäinen ,  Otto Nylén

    IPC: C08L1/02 ,  C08J5/18 ,  C08L33/26 ,  D21H11/18 ,  D21H17/41 ,  D21H17/66 ,  D21H17/00

    Abstract: A method for the production of a fibrous product from a fibrous web, wherein the method comprises the steps of: providing a fibrous suspension comprising native microfibrillated cellulose, wherein the content of the microfibrillated cellulose of said suspension is in the range of 40 to 99.9 weight-% based on total dry solid content, said fibrous suspension further comprising organic acid, a metal salt or a mixture thereof, wherein the amount of organic acid, metal salt or mixture thereof is at least 2 weight-% based on total dry solid content of the suspension, —said fibrous suspension also comprising an uncharged, amphoteric or weakly cationic polymer having a molecular weight of at least 50000 g/mol, —said fibrous suspension also comprising an anionic polymer having a molecular weight of at least 10000 g/mol to said suspension, —providing said suspension to a substrate to form a fibrous web, wherein the amount of uncharged, amphoteric or weakly cationic polymer in said suspension is in the range of 0.1 to 20 kg/metric ton based on total dry solid content and wherein the amount of anionic polymer in said suspension is in the range of 0.01 to 10 kg/metric ton based on total dry solid content; and —dewatering said fibrous web to form a fibrous product.

    Method of producing microfibrillated cellulose
    130.
    发明授权
    Method of producing microfibrillated cellulose 有权

    公开(公告)号：US10240288B2

    公开(公告)日：2019-03-26

    申请号：US14758708

    申请日：2013-12-30

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Henri Kastinen ,  Anna Kauppi ,  Jukka Kankkunen ,  Lars Axrup ,  Cecilia Land Hensdal ,  Heidi Saxell ,  Kaj Backfolk

    IPC: D21C9/00 ,  D21H11/18 ,  D21H17/00 ,  D21H11/04 ,  C08B15/08 ,  C08L1/04 ,  D21D1/20

    Abstract: The invention relates to methods of producing microfibrillated cellulose (MFC). According to the invention a fibrous pulp suspension is fibrillated mechanically at a consistency of less than 12.5%, dewatered to raise the consistency of the fibrillated suspension to at least 12.5%, and then subjected in the dewatered condition to further fibrillation. Alternatively an initially fibrillated fibrous pulp suspension may be dewatered and fibrillated in the dewatered condition, after which these dewatering and fibrillating steps are repeated one or more times so that pulp consistency is increased for each fibrillation step. The goals of raising the consistency between subsequent fibrillations are energy saving and an increased aspect ratio in MFC. The invention even comprises uses of the MFC product, e.g. as an additive for papermaking furnish or injection molded plastic composites.

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