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    Method to produce a film comprising microfibrillated cellulose and an amphoteric polymer
    23.
    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
    24.
    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.

    OXYGEN BARRIER FILM AND LAMINATE AND METHODS OF MANUFACTURING THE SAME
    27.
    发明申请
    OXYGEN BARRIER FILM AND LAMINATE AND METHODS OF MANUFACTURING THE SAME 审中-公开

    公开(公告)号：US20190091982A1

    公开(公告)日：2019-03-28

    申请号：US16087207

    申请日：2017-03-20

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Esa Saukkonen ,  Ville Ribu

    IPC: B32B27/32 ,  B32B27/10 ,  B32B27/12 ,  B32B27/30 ,  B32B27/34 ,  B32B29/00

    Abstract: The invention concerns a fibrous-based oxygen barrier film, which comprises (i) a microfibrillated cellulose (MFC) film, (ii) an oxygen barrier polymer layer, (iii) an optional tie layer, and (iv) an outermost polyolefin layer. The invention even concerns a laminate, in which said multilayer film is combined with a fibrous paper or board base by means of an intermediate poly-ethylene layer. The oxygen barrier polymerlayer, which preferably is EVOH, and the polyolefin layer are brought by coextrusion onto the MFC film. The film and the laminate according to the invention aim at an improved oxygen barrier in high humidity conditions and have use in oxygen-sensitive food packaging.

    FLEXIBLE MICROFIBRILLATED FILM FORMATION
    28.
    发明申请
    FLEXIBLE MICROFIBRILLATED FILM FORMATION 审中-公开

    公开(公告)号：US20180245286A1

    公开(公告)日：2018-08-30

    申请号：US15754692

    申请日：2016-09-16

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Katja Lyytikainen

    IPC: D21H11/18 ,  D21H27/30

    CPC classification number: D21H11/18 ,  D21H27/30

    Abstract: A method of manufacturing a film comprising microfibrillated cellulose, wherein the method comprises the steps of: providing a first suspension comprising microfibrillated cellulose, having a dry content of from 0.2 to 2.0%, wherein the first suspension has a first Schopper-Riegler (SR) value; forming a first web of said suspension; at least partly dewatering said first web; applying a second suspension comprising microfibrillated cellulose, and/or fines and/or fibers onto a surface of said formed and at least partially dried first web, wherein the second suspension has a second Schopper-Riegler value which is higher than said first Schopper-Riegler value, thereby forming a film.

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