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    High Efficiency Fiber Bleaching Process
    1.
    发明公开
    High Efficiency Fiber Bleaching Process 审中-公开

    公开(公告)号：US20230167604A1

    公开(公告)日：2023-06-01

    申请号：US18159700

    申请日：2023-01-26

    申请人： GPCP IP Holdings LLC

    发明人： Jeffrey A. Lee

    IPC分类号： D21C9/10 ,  D21C9/16 ,  D21H11/14

    CPC分类号： D21C9/1057 ,  D21C9/163 ,  D21H11/14 ,  D21C9/1084 ,  D21C9/1063

    摘要： A high efficiency bleaching method for cellulosic pulp includes: (a) providing a charge of aqueous cellulosic pulp to a bleaching vessel at a consistency of from 10% to 30% along with a peroxy bleaching agent and an alkaline agent effective to adjust pH of the charge to 9.5 to 12.5; and (b) bleaching the aqueous cellulosic pulp in the bleaching vessel while maintaining a bleaching temperature of from 110° F. (43° C.) to 135° F. (57° C.) and a pH of the charge from 9.5 to 12.5 for an extended bleaching retention time. The bleaching method is advantageously used to bleach low brightness recycle pulp, and/or as part of a multistage process with bleaching stages of lesser duration, and/or as a high peroxy efficiency, low dose bleaching process or in connection with concurrently storing and bleaching pulp.

    High Efficiency Fiber Bleaching Process
    2.
    发明申请
    High Efficiency Fiber Bleaching Process 有权

    公开(公告)号：US20210079594A1

    公开(公告)日：2021-03-18

    申请号：US17006089

    申请日：2020-08-28

    申请人： GPCP IP Holdings LLC

    发明人： Jeffrey A. Lee

    IPC分类号： D21C9/10 ,  D21C9/16 ,  D21H11/14

    摘要： A high efficiency bleaching method for cellulosic pulp includes: (a) providing a charge of aqueous cellulosic pulp to a bleaching vessel at a consistency of from 10% to 30% along with a peroxy bleaching agent and an alkaline agent effective to adjust pH of the charge to 9.5 to 12.5; and (b) bleaching the aqueous cellulosic pulp in the bleaching vessel while maintaining a bleaching temperature of from 110° F. (43° C.) to 135° F. (57° C.) and a pH of the charge from 9.5 to 12.5 for an extended bleaching retention time. The bleaching method is advantageously used to bleach low brightness recycle pulp, and/or as part of a multistage process with bleaching stages of lesser duration, and/or as a high peroxy efficiency, low dose bleaching process or in connection with concurrently storing and bleaching pulp.

    High efficiency fiber bleaching process
    6.
    发明授权
    High efficiency fiber bleaching process 有权

    公开(公告)号：US11591751B2

    公开(公告)日：2023-02-28

    申请号：US17006089

    申请日：2020-08-28

    申请人： GPCP IP Holdings LLC

    发明人： Jeffrey A. Lee

    IPC分类号： D21C9/10 ,  D21C9/16 ,  D21H11/14

    摘要： A high efficiency bleaching method for cellulosic pulp includes: (a) providing a charge of aqueous cellulosic pulp to a bleaching vessel at a consistency of from 10% to 30% along with a peroxy bleaching agent and an alkaline agent effective to adjust pH of the charge to 9.5 to 12.5; and (b) bleaching the aqueous cellulosic pulp in the bleaching vessel while maintaining a bleaching temperature of from 110° F. (43° C.) to 135° F. (57° C.) and a pH of the charge from 9.5 to 12.5 for an extended bleaching retention time. The bleaching method is advantageously used to bleach low brightness recycle pulp, and/or as part of a multistage process with bleaching stages of lesser duration, and/or as a high peroxy efficiency, low dose bleaching process or in connection with concurrently storing and bleaching pulp.

    High consistency re-pulping method, apparatus and absorbent products incorporating recycled fiber
    8.
    发明授权
    High consistency re-pulping method, apparatus and absorbent products incorporating recycled fiber 有权

    公开(公告)号：US11486089B2

    公开(公告)日：2022-11-01

    申请号：US17062789

    申请日：2020-10-05

    申请人： GPCP IP Holdings LLC

    发明人： Jeffrey A. Lee

    IPC分类号： D21C5/02 ,  D21B1/34 ,  D21C7/00 ,  D21C7/06 ,  D21C9/10 ,  D21H11/14

    摘要： A method of pulping wastepaper includes providing a pulping vessel with a rotor and at least one flow sensor adapted to measure slurry flow within the pulping vessel. The pulping vessel is charged with wastepaper and water to form a slurry, the amounts of wastepaper and water being present such that the slurry has consistency in the range of from 10% to 30%. The wastepaper charge in the pulping vessel is pulped at a pre-selected power level while monitoring poloidal slurry flow in the pulping vessel; and from time-to-time, water may be added to the pulping vessel when the poloidal flow falls below a predetermined lower threshold flow value in order to reduce viscosity and thereby restore poloidal flow within the pulping vessel. Doppler velocimetry is a preferred method of monitoring pulp flow. In a particularly preferred construction the rotor has a variable power drive. The inventive method is especially useful for making high quality, high brightness furnishes from wastepaper which varies from batch to batch.