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    Method of producing microfibrillated cellulose
    133.
    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.

    A METHOD OF PRODUCING OXIDIZED OR MICROFIBRILLATED CELLULOSE
    137.
    发明申请
    A METHOD OF PRODUCING OXIDIZED OR MICROFIBRILLATED CELLULOSE 审中-公开
    生产氧化或微晶纤维素的方法

    公开(公告)号：US20160153144A1

    公开(公告)日：2016-06-02

    申请号：US14905463

    申请日：2014-07-11

    Applicant: STORA ENSO OYJ

    Inventor： Jaakko Hiltunen ,  Isto Heiskanen ,  Heidi Saxell ,  Jukka Kahelin ,  Erkki Saharinen

    IPC: D21H11/20 ,  C08B15/02 ,  D21C9/00

    Abstract: The invention relates to a method of producing oxidized or microfibrillated cellulose (MFC). According to the invention there is provided an aqueous pulp suspension with a consistency of at least 15%, and at least one oxidant is added to the suspension to oxidize cellulosic hydroxyl groups in the suspension under mechanical mixing or shearing. The oxidized suspension, washed and diluted to a lower consistency, is subjected to homogenization to yield gel-like MFC. Alkali hypochlorite may be used as oxidant, and preferred mediating oxidation catalysts are AZADO and TEMPO. Alkali bromide may be used as a cocatalyst. The MFC product, which as a suspension has an increased viscosity, is suitable as a means of regulating viscosity or for production of films and composites.

    Abstract translation: 本发明涉及一种生产氧化或微纤化纤维素（MFC）的方法。 根据本发明，提供了至少15％的稠度的水性纸浆悬浮液，并且在悬浮液中加入至少一种氧化剂以在机械混合或剪切下氧化悬浮液中的纤维素羟基。 将氧化悬浮液洗涤并稀释至较低浓度，进行均化，得到凝胶状MFC。 碱性次氯酸盐可以用作氧化剂，优选的介质氧化催化剂是AZADO和TEMPO。 碱性溴化物可用作助催化剂。 作为悬浮液具有增加的粘度的MFC产品适合作为调节粘度或用于生产膜和复合材料的手段。

    Process for production of nano-coated substrate
    138.
    发明授权
    Process for production of nano-coated substrate 有权

    公开(公告)号：US12286756B2

    公开(公告)日：2025-04-29

    申请号：US17996939

    申请日：2021-05-06

    Applicant: Stora Enso OYJ

    Inventor： Kaj Backfolk ,  Isto Heiskanen ,  Jukka Kankkunen

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

    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.

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