METHOD FOR MANUFACTURING A BARRIER FILM COMPRISING HIGHLY REFINED CELLULOSE

    公开(公告)号:US20240133118A1

    公开(公告)日:2024-04-25

    申请号:US18548368

    申请日:2022-03-08

    Applicant: Stora Enso OYJ

    Abstract: The present invention relates to a method for manufacturing a barrier film comprising highly refined cellulose, said method comprising: a) providing a highly refined cellulose pulp suspension comprising highly refined cellulose pulp having a Schopper-Riegler (SR) number in the range of 40-98 as determined by standard ISO 5267-1 and a content of fibers having a length >0.2 mm of at least 7 million fibers per gram based on dry weight, at a consistency in the range of 0.1-1.5 wt %; b) forming a web of the highly refined cellulose pulp suspension and dewatering the web in a paper machine former on a wire to a consistency of at least 5 wt % to obtain a substrate web, wherein the white water removed from the pulp contains 2-25 wt %, preferably 5-20 wt % and more preferably at least 5-15 wt % of the solids of the highly refined cellulose pulp suspension provided in step a); c) optionally further dewatering and optionally drying the substrate web; d) coating the optionally further dewatered and optionally dried substrate web with a coating suspension comprising cellulose fines or microfibrillated cellulose to obtain a coated web; and e) dewatering and/or drying the coated web to obtain a barrier film comprising highly refined cellulose.

    MULTILAYER FILM COMPRISING HIGHLY REFINED CELLULOSE FIBERS

    公开(公告)号:US20230135217A1

    公开(公告)日:2023-05-04

    申请号:US17995447

    申请日:2021-04-14

    Applicant: Stora Enso OYJ

    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 y applying a foamed second pulp suspension comprising highly refined cellulose fibers and a foaming agent on a second wire; d) partially dewatering the foamed second wet web to obtain a second partially dewatered web; e) joining the first and second partially dewatered web to obtain a multilayer web; and f) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers.

    PROCESS FOR PRODUCTION OF FILM OR COATING COMPRISING CELLULOSIC NANOMATERIAL

    公开(公告)号:US20210403734A1

    公开(公告)日:2021-12-30

    申请号:US17294794

    申请日:2019-11-27

    Applicant: Stora Enso OYJ

    Abstract: The present invention is directed to a process for manufacturing a film or coating comprising high amounts of cellulosic nanomaterial. According to the present invention, a screen printing press, such as a rotary screen press, is used to create a film or coating comprising cellulosic nanomaterial. One benefit of the present process is that the suspension used in the printing process has a high dry content and high viscosity, thereby facilitating the process for manufacturing a film or coating comprising high amounts of cellulosic nanomaterial.

    A METHOD FOR THE PRODUCTION OF A COATED PAPER, PAPERBOARD OR FILM AND A COATED PAPER, PAPERBOARD OR FILM

    公开(公告)号:US20210363701A1

    公开(公告)日:2021-11-25

    申请号:US17046410

    申请日:2019-04-12

    Applicant: Stora Enso OYJ

    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 and/or nanocellulose, 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 polymers and/or particles wherein the second suspension has a Brookfield viscosity above 3000 m Pas at a dry content between 4%-40% by weight, providing at least one calender comprising at least one roll or belt, applying the second suspension to the surface of the at least one calender roll or belt forming a coating web and conducting said fibrous web through the at least one calender whereby the coating web is applied 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.

    FILM COMPRISING MICROFIBRILLATED CELLULOSE AND PRODUCTS MADE THEREFROM

    公开(公告)号:US20200325287A1

    公开(公告)日:2020-10-15

    申请号:US16096800

    申请日:2017-04-26

    Applicant: Stora Enso OYJ

    Abstract: The present invention is directed to a film comprising a base film which has been coated on at least one side with a coating that enhances gas and/or moisture barrier properties, wherein the base film comprises a fiber material and at least 60% by weight of said fiber material is microfibrillated cellulose, and the thickness of the coating is from 0.05 to 20 μm. The invention is also directed to products using said film. Such products are in particular packages suitable for sensitive objects that need to be packaged in a controlled or modified atmosphere. The film is also useful for other purposes, such as in the manufacture of balloons.

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