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471 条记录 (耗时 0.031 秒)

    Method for controlling hydrophobic particles in aqueous environment in paper or board manufacture
    35.
    发明授权
    Method for controlling hydrophobic particles in aqueous environment in paper or board manufacture 有权

    公开(公告)号：US10550518B2

    公开(公告)日：2020-02-04

    申请号：US15739743

    申请日：2016-06-23

    申请人： Kemira Oyj

    发明人： Li Yan ,  Zeming Bai

    IPC分类号： D21H17/14 ,  D21H21/06 ,  D21H11/14 ,  D21H27/00 ,  D21J1/00

    摘要： The invention relates to a method for controlling hydrophobic particles in aqueous environment in paper or board manufacture. The method comprises preparing an aqueous stock comprising natural fibrous material, feeding the stock to a wire section, where a fibrous web is formed by draining excess water through a wire, and adding a control chemical to aqueous environment at least in one dosage point between the preparation of the stock and the exit of the web from the wire section. The control chemical comprises performic acid, which is added to the aqueous stock, which has consistency of at least 3 weight-%.

    Crosslinked cellulose as precursor in production of high-grade cellulose derivatives and related technology
    36.
    发明授权
    Crosslinked cellulose as precursor in production of high-grade cellulose derivatives and related technology 有权

    公开(公告)号：US10428459B2

    公开(公告)日：2019-10-01

    申请号：US15909848

    申请日：2018-03-01

    申请人： INTERNATIONAL PAPER COMPANY

    发明人： Mengkui Luo

    IPC分类号： D21C9/00 ,  D21C9/18 ,  D21C9/147 ,  D21H13/04 ,  D21H11/04 ,  D21C9/10 ,  C08B15/10 ,  C08H8/00 ,  C08L97/02 ,  D21H11/14

    摘要： A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175.

    Paper and paperboard products
    38.
    发明授权
    Paper and paperboard products 有权

    公开(公告)号：US10214859B2

    公开(公告)日：2019-02-26

    申请号：US15475487

    申请日：2017-03-31

    申请人： FiberLean Technologies Limited

    发明人： Per Svending ,  Jonathan Stuart Phipps ,  Johannes Kritzinger ,  Tom Larson ,  Tania Selina ,  David Skuse

    IPC分类号： D21H11/18 ,  D21H17/28 ,  D21H17/67 ,  D21H17/68 ,  D21H19/52 ,  D21H21/10 ,  D21H27/32 ,  D21H19/36 ,  D21H19/38 ,  D21H19/40 ,  D21H11/04 ,  D21H11/14

    摘要： The present invention is directed to products, such as paper and paperboard products, comprising a substrate containing cellulose and top ply comprising microfibrillated cellulose and inorganic particulate, to methods of making such paper and paperboard products, and associated uses of such paper and paperboard products. The microfibrillated cellulose and inorganic particulate material are applied at the stage when the wet substrate is in the process of being formed on the wire of a papermaking machine, thereby avoiding the additional cost of more extensive equipment and machinery as well as in separate drying of a coating. The microfibrillated cellulose facilitates the application of inorganic particulate onto the surface of a wet paper or paperboard substrate when applied thusly, by trapping the inorganic particulate on the surface of the substrate and by giving the composite sufficient strength and a suitable pore structure to make it suitable for printing and other end-use demands.