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    A METHOD TO PRODUCE A FIBROUS PRODUCT COMPRISING MICROFIBRILLATED CELLULOSE
    13.
    发明申请
    A METHOD TO PRODUCE A FIBROUS PRODUCT COMPRISING MICROFIBRILLATED CELLULOSE 有权

    公开(公告)号：US20210095424A1

    公开(公告)日：2021-04-01

    申请号：US16955470

    申请日：2018-12-17

    Applicant: Stora Enso OYJ

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

    IPC: D21H11/18 ,  D21H21/08 ,  D21H17/45 ,  D21H17/42 ,  D21H17/32 ,  D21H23/04 ,  D21F1/00 ,  B32B27/10 ,  B32B27/32

    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 00000 g/mol to said suspension to provide a mixture of said microfibrillated cellulose, said uncharged, amphoteric or weakly cationic polymer and said anionic polymer, 1—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 20 solid content; and—dewatering said fibrous web to form a fibrous product.

    Method to form a web comprising fibers
    15.
    发明授权
    Method to form a web comprising fibers 有权

    公开(公告)号：US10927503B2

    公开(公告)日：2021-02-23

    申请号：US16345348

    申请日：2017-10-27

    Applicant: Stora Enso OYJ

    Inventor： Kaj Backfolk ,  Isto Heiskanen ,  Esa Saukkonen

    IPC: D21H11/18 ,  D21H21/06 ,  D21H23/04 ,  D21H17/03 ,  D21H17/70 ,  D21H23/02 ,  D21H17/20

    Abstract: The invention discloses a method to enable the efficient use of surfactants in web forming of a cellulose containing material, e.g. in the making of paper or paperboard. The method comprises the addition of microfibrillated cellulose (MFC) or nanocrystalline cellulose (NCC) to the white water in a web-forming process in order to form complexes with surface active agents. The formed complexes are at least partly recycled to the process. This enables the producer to have control over the concentration of surface active agents in the system.

    Method to produce a film comprising microfibrillated cellulose and an amphoteric polymer
    18.
    发明授权
    Method to produce a film comprising microfibrillated cellulose and an amphoteric polymer 有权

    公开(公告)号：US10577747B2

    公开(公告)日：2020-03-03

    申请号：US15754870

    申请日：2016-09-16

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk

    IPC: D21H11/18 ,  D21H21/20 ,  D21H17/32 ,  D21H17/37 ,  B32B27/10 ,  D21H21/10 ,  D21H17/22 ,  D21H17/28 ,  D21H17/24 ,  D21H17/31

    Abstract: A method for the production of a film 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 amphoteric polymer to said suspension to provide a mixture of said microfibrillated cellulose and said amphoteric polymer, providing said mixture to a substrate to form a fibrous web, wherein the amount of amphoteric polymer in said mixture is in the range of 0.1 to 20 kg/metric ton based on total dry solid content; and dewatering said fibrous web to form a film having a basis weight of less than 40 g/m2 and a density in the range of from 700 to 1000 kg/m3.

    Surface sizing of dense films
    19.
    发明授权
    Surface sizing of dense films 有权

    公开(公告)号：US10435842B2

    公开(公告)日：2019-10-08

    申请号：US15758963

    申请日：2016-09-16

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Esa Saukkonen

    IPC: D21H11/18 ,  D21H21/16 ,  D21H19/10 ,  D21H19/36 ,  D21H17/26 ,  D21H17/57

    Abstract: A method for manufacturing a film, wherein said film has a basis weight of less than 50 g/m2 and wherein the density of the film is higher than 750 kg/m2 comprising the steps of: providing a suspension comprising microfibrillated cellulose (MFC); forming a web of said suspension on a porous wire, microfibrillated cellulose (MFC); surface sizing said web, wherein the web, at the beginning of the surface sizing step, has a moisture content in the range of from 10 to 50 wt-%; drying said surface sized web to a final moisture content of between 0.1-20 wt-% to form said film.

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