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    APPARATUS AND METHOD FOR PROCESSING WOOD FIBERS
    13.
    发明申请
    APPARATUS AND METHOD FOR PROCESSING WOOD FIBERS 有权

    公开(公告)号：US20210262166A1

    公开(公告)日：2021-08-26

    申请号：US17315638

    申请日：2021-05-10

    Applicant: INTERNATIONAL PAPER COMPANY

    Inventor： Dwight Edward Anderson

    IPC: D21D1/30 ,  D21D1/00

    Abstract: A refining member comprising a refining body with a refining surface comprising first and second refiner bars separated by first and second refiner grooves, respectively. The first refiner bars extend from a radially inward position to a first radially outward position. The second refiner bars extend to a second radially outward position that is nearer to an outermost part of the refining body than the first radially outward position. The second refiner bars have a longitudinal length from about 0.6 cm to about 10 cm. The first and second refiner bars have a respective first and second maximum height extending upward from a floor of a respective, adjacent first or second refiner groove. The second maximum height is at least 0.35 mm less than the first maximum height. The first refiner bars are adapted to refine wood fibers and the second refiner bars are adapted to break up fiber bundles.

    GRAFTED CROSSLINKED CELLULOSE
    14.
    发明申请
    GRAFTED CROSSLINKED CELLULOSE 有权

    公开(公告)号：US20210246247A1

    公开(公告)日：2021-08-12

    申请号：US17241421

    申请日：2021-04-27

    Applicant: INTERNATIONAL PAPER COMPANY

    Inventor： Karen Brogan ,  Charles E. Miller ,  Angel Stoyanov ,  Torsten Lindner ,  Maike Siemons

    IPC: C08F251/02 ,  C08B3/08 ,  C08B15/00 ,  D21H27/00 ,  D21H11/16 ,  D21H11/20 ,  D21H17/37 ,  D01F11/02 ,  D21C9/00 ,  D21H21/22 ,  B01J20/24 ,  B01J20/26 ,  B01J20/28

    Abstract: Grafted, crosslinked cellulosic materials include cellulose fibers and polymer chains composed of at least one monoethylenically unsaturated acid group-containing monomer (such as acrylic acid) grafted thereto, in which one or more of said cellulose fibers and said polymer chains are crosslinked (such as by intra-fiber chain-to-chain crosslinks). Some of such materials are characterized by a wet bulk of about 10.0-17.0 cm3/g, an IPRP value of about 1000 to 7700 cm2/MPa·sec, and/or a MAP value of about 7.0 to 38 cm H2O. Methods for producing such materials may include grafting polymer chains from a cellulosic substrate, followed by treating the grafted material with a crosslinking agent adapted to effect crosslinking of one or more of the cellulosic substrate or the polymer chains. Example crosslinking mechanisms include esterfication reactions, ionic reactions, and radical reactions, and example crosslinking agents include pentaerythritol, homopolymers of the graft species monomer, and hyperbranched polymers.

    SEAL ASSEMBLY AND METHOD OF USING THE SAME
    16.
    发明申请
    SEAL ASSEMBLY AND METHOD OF USING THE SAME 有权

    公开(公告)号：US20210131565A1

    公开(公告)日：2021-05-06

    申请号：US16671632

    申请日：2019-11-01

    Applicant: INTERNATIONAL PAPER COMPANY

    Inventor： Steven George Scheer

    IPC: F16J15/3284

    Abstract: A seal assembly including: a collar having an opening configured to receive a rotatable shaft, an annular member having an annular opening configured to receive the collar, and first and second end plates fixedly coupled to a respective one of the first and second end surfaces of the collar. An outer surface of the collar includes one or more helical threads. The collar has a first axial length defined between first and second end surfaces of the collar, and the annular member has a second axial length defined between first and second end surfaces of the annular member, in which the second axial length is less than the first axial length. Also provided are an assembly comprising a seal assembly in accordance with the present disclosure and a method for preventing contamination of a sealed chamber.

    MODIFIED FIBER, METHODS, AND SYSTEMS
    17.
    发明申请
    MODIFIED FIBER, METHODS, AND SYSTEMS 有权

    公开(公告)号：US20210131038A1

    公开(公告)日：2021-05-06

    申请号：US17143051

    申请日：2021-01-06

    Applicant: International Paper Company

    Inventor： Charles E. Miller

    IPC: D21H11/20 ,  C08J3/24 ,  B01J19/24 ,  D21C9/00

    Abstract: Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.

    CONTAINER WITH IMPROVED BREAKDOWN FEATURES
    19.
    发明申请
    CONTAINER WITH IMPROVED BREAKDOWN FEATURES 有权

    公开(公告)号：US20210101713A1

    公开(公告)日：2021-04-08

    申请号：US16594701

    申请日：2019-10-07

    Applicant: INTERNATIONAL PAPER COMPANY

    Inventor： Alex Dean Bevier

    IPC: B65D5/36 ,  B65D5/42 ,  B65D5/20

    Abstract: A corrugated cardboard blank for making a collapsible container including one or more panels joined to a bottom panel. The bottom panel is divided into first and second sectional panels on opposing sides of an interface comprising perforated portions extending from a first pair of diagonally opposing corners of the bottom panel. Each perforated portion includes an inner end, wherein the inner ends of the perforated portions are longitudinally spaced from each other. First and second fold lines extend diagonally at least partially between a second pair of diagonally opposing corners of the bottom panel and respective perforated portions. A frangible central portion of the interface extends between the inner ends of the perforated portions, wherein a plurality of unbroken flutes of the corrugated material extend laterally across the central portion of the interface.

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