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    A METHOD FOR PRODUCING A FILM HAVING GOOD BARRIER PROPERTIES
    32.
    发明专利
    A METHOD FOR PRODUCING A FILM HAVING GOOD BARRIER PROPERTIES 未知

    公开(公告)号：ZA201800796B

    公开(公告)日：2018-12-19

    申请号：ZA201800796

    申请日：2018-02-07

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  BACKFOLK KAJ ,  SAUKKONEN ESA ,  RUOHONIEMI NINA ,  LYYTIKÄINEN KATJA

    Abstract: The present invention relates to a method for manufacturing a film having an oxygen transmission rate in the range of from 1 cc/m2/24 h to 500 cc/m2/24 h according to ASTM D-3985, at a relative humidity of more than 50% at 25° C., or higher than 75% at 25° C., or higher than 85% at 25° C., wherein the method comprises the steps of: providing a first suspension comprising a microfibrillated cellulose, wherein the dry content of the suspension is in the range of from 0.1 to 10% by weight, adding a wet strength additive to said first suspension, at an amount of from 0.1 to 10 weight-% based on the amount of microfibrillated cellulose (dry/dry), thereby forming a mixture of the microfibrillated cellulose and the wet strength additive, applying said mixture to a substrate to form a fibrous web and drying said web to form said film. The present invention also relates to a film produced according to the method.

    A method to produce a fibrous product comprising microfibrillated cellulose
    38.
    发明专利
    A method to produce a fibrous product comprising microfibrillated cellulose 未知

    公开(公告)号：SE543616C2

    公开(公告)日：2021-04-20

    申请号：SE1950730

    申请日：2019-06-17

    Applicant: STORA ENSO OYJ

    Inventor： HEISKANEN ISTO ,  BACKFOLK KAJ ,  LYYTIKÄINEN KATJA ,  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.

    A method to produce a fibrous product comprising microfibrillated cellulose
    39.
    发明专利
    A method to produce a fibrous product comprising microfibrillated cellulose 未知

    公开(公告)号：SE543324C2

    公开(公告)日：2020-11-24

    申请号：SE1751572

    申请日：2017-12-19

    Applicant: STORA ENSO OYJ

    Inventor： SAUKKONEN ESA ,  HEISKANEN ISTO ,  BACKFOLK KAJ ,  LYYTIKÄINEN KATJA

    IPC: C08L1/02 ,  C08J5/18 ,  D21H11/18 ,  D21H17/28 ,  D21H17/32

    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 a microfibrillated cellulose, wherein the content of the microfibrillated cellulose of said suspension is in the range of 60 to 99.9 weight-% based on total dry solid content,- adding an uncharged, amphoteric or weakly cationic polymer having a molecular weight of at least 50000 g/mol to said suspension,- adding an anionic polymer having a molecular weight of at least 100000 g/mol to said suspension to provide a mixture of said microfibrillated cellulose, said uncharged, amphoteric or weakly cationic polymer and said anionic polymer,- providing said mixture to a substrate to form a fibrous web, wherein the amount of uncharged, amphoteric or weakly cationic polymer in said mixture 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 mixture 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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