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    Method for producing a film having good barrier properties
    11.
    发明授权
    Method for producing a film having good barrier properties 有权

    公开(公告)号：US10676868B2

    公开(公告)日：2020-06-09

    申请号：US15759089

    申请日：2016-09-16

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Esa Saukkonen ,  Nina Ruohoniemi ,  Katja Lyytikainen

    IPC: D21H11/18 ,  D21H21/20 ,  B29D7/01 ,  C08J5/18 ,  D21C9/00 ,  D21H11/20

    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 FOR THE PRODUCTION OF A COATED PAPER, PAPERBOARD OR FILM AND A COATED PAPER, PAPERBOARD OR FILM
    12.
    发明申请
    A METHOD FOR THE PRODUCTION OF A COATED PAPER, PAPERBOARD OR FILM AND A COATED PAPER, PAPERBOARD OR FILM 审中-公开

    公开(公告)号：US20200023627A1

    公开(公告)日：2020-01-23

    申请号：US16471983

    申请日：2017-12-21

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Esa Saukkonen

    IPC: B32B29/02 ,  D21C9/18

    Abstract: The present invention relates to a method for the production of a coated paper, paperboard or film, wherein the method comprises the steps of; providing a first suspension comprising cellulose fibers, applying the first suspension on a substrate to form a fibrous web, wherein the web has a first and a second side, providing a second suspension comprising micro fibrillated cellulose, applying the second suspension either to the first side of the fibrous web or to a surface of a drying equipment and conducting said fibrous web through the drying equipment whereby the second suspension is added to the first side of the web forming the coated paper, paperboard or film. The invention also relates to a paper, paperboard or film produced according to the method.

    METHOD FOR FORMING A FILM COMPRISING NANOCELLULOSE
    14.
    发明申请
    METHOD FOR FORMING A FILM COMPRISING NANOCELLULOSE 审中-公开

    公开(公告)号：US20190276619A1

    公开(公告)日：2019-09-12

    申请号：US16345994

    申请日：2017-10-31

    Applicant: Stora Enso OYJ

    Inventor： Esa Saukkonen ,  Isto Heiskanen ,  Kaj Backfolk ,  Ville Ribu

    IPC: C08J5/18 ,  D21H11/18 ,  D21H25/04

    Abstract: A method of forming a film comprising nanocellulose having an Oxygen Transmission Rate (OTR) value in the range of 0.1 to 300 cc/m2/24 h at 38° C. and 85% relative humidity (RH), and having a basis weight in the range of in the range of 0.1 to 45 g/m2 wherein the method comprises the steps of; providing a suspension comprising nanocellulose, forming at least one layer of a web or a film from said suspension; drying said formed web or film to a dry content of at least 65 weight-%, wherein said method further comprises the steps of; treating at least one side of said dewatered and dried web or film with ultra violet (UV) or electron beam (EB) irradiation; and wherein at least one cooling step is provided in connection with or after the UV or EB treatment step.

    A METHOD TO FORM A WEB COMPRISING FIBERS
    15.
    发明申请
    A METHOD TO FORM A WEB COMPRISING FIBERS 审中-公开

    公开(公告)号：US20190264394A1

    公开(公告)日：2019-08-29

    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

    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.

    SURFACE SIZING OF DENSE FILMS
    17.
    发明申请
    SURFACE SIZING OF DENSE FILMS 审中-公开

    公开(公告)号：US20180245289A1

    公开(公告)日：2018-08-30

    申请号：US15758963

    申请日：2016-09-16

    Applicant: Stora Enso OYJ

    Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Esa Saukkonen

    IPC: D21H21/16 ,  D21H11/18 ,  D21H17/26 ,  D21H17/57

    CPC classification number: D21H21/16 ,  D21H11/18 ,  D21H17/26 ,  D21H17/57 ,  D21H19/10 ,  D21H19/36

    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 microfiber Hated 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 rage 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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