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    A METHOD OF PRODUCING OXIDIZED OR MICROFIBRILLATED CELLULOSE
    51.
    发明专利
    A METHOD OF PRODUCING OXIDIZED OR MICROFIBRILLATED CELLULOSE 未知

    公开(公告)号：CA2918182C

    公开(公告)日：2021-11-09

    申请号：CA2918182

    申请日：2014-07-11

    Applicant: STORA ENSO OYJ

    Inventor： HILTUNEN JAAKKO ,  HEISKANEN ISTO ,  SAXELL HEIDI ,  KAHELIN JUKKA ,  SAHARINEN ERKKI

    IPC: D21H11/20 ,  C08B15/02 ,  C08B15/04 ,  C08B15/08 ,  C08L1/02 ,  D21C9/00 ,  D21H11/18

    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.

    Método de producción en línea para un proceso de fabricación de papel
    52.
    发明专利
    Método de producción en línea para un proceso de fabricación de papel 未知

    公开(公告)号：ES2871057T3

    公开(公告)日：2021-10-28

    申请号：ES13853131

    申请日：2013-11-06

    Applicant: STORA ENSO OYJ ,  WETEND TECH LTD

    Inventor： IMPPOLA OLAVI ,  MATULA JOUNI ,  MATULA JUSSI ,  TAHKOLA KARRI ,  HEISKANEN ISTO ,  VÄKEVÄINEN MATTI ,  RÄSÄNEN JARI

    IPC: D21H17/70 ,  D21H11/18 ,  D21H17/25 ,  D21H17/67

    Abstract: Un método de producción en línea para proporcionar un flujo líquido de al menos dos aditivos en el material para fabricación de papel en la circulación corta de una máquina de fabricación de papel, alimentando el flujo líquido de los al menos dos aditivos en la circulación corta de la máquina de fabricación de papel, en donde el método comprende además permitir que estos dos aditivos reaccionen entre sí, en donde el método comprende cristalizar carbonato de calcio, y en donde los aditivos son al menos dióxido de carbono y lechada de cal, alimentándose dicho dióxido de carbono y lechada de cal a la circulación corta de la máquina de fabricación de papel caracterizado por que una cantidad adecuada de una celulosa microfibrilada se proporciona sustancialmente de forma simultánea a la alimentación del flujo líquido de los dos aditivos, de tal forma que los aditivos reaccionan o inician la nucleación sobre la superficie de la celulosa microfibrilada o precipitan sobre la superficie de la celulosa microfibrilada y, de esta manera, forman complejos con la celulosa microfibrilada.

    Multilayer film comprising highly refined cellulose fibers
    53.
    发明专利
    Multilayer film comprising highly refined cellulose fibers 未知

    公开(公告)号：SE2050422A1

    公开(公告)日：2021-10-16

    申请号：SE2050422

    申请日：2020-04-15

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  BACKFOLK KAJ ,  LYYTIKÄINEN KATJA

    IPC: C08J5/18 ,  B32B29/02 ,  B82Y30/00 ,  C07G1/00 ,  C08L1/02 ,  C08L97/00 ,  D21F1/00 ,  D21F11/04 ,  D21H11/18 ,  D21H21/16 ,  D21H27/30

    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; andf) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers;wherein at least one of said first and second pulp suspension comprises lignin at a concentration in the range of 0.1-50 wt%, based on the total dry weight of the pulp suspension.

    A method to produce a fibrous product comprising microfibrillated cellulose
    59.
    发明专利
    A method to produce a fibrous product comprising microfibrillated cellulose 未知

    公开(公告)号：SE1950730A1

    公开(公告)日：2020-12-18

    申请号：SE1950730

    申请日：2019-06-17

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  LYYTIKÄINEN KATJA ,  BACKFOLK KAJ ,  NYLÉN OTTO

    IPC: D21H11/18 ,  B32B27/06 ,  C08J5/18 ,  C08L1/02 ,  D21H17/41 ,  D21H17/66

    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.

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