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    Peroxide bleaching process for cellulosic and lignocellulosic material
    32.
    发明公开
    Peroxide bleaching process for cellulosic and lignocellulosic material 失效
    Verfahren zum Peroxidbleichen von zellulosischen Materialien

    公开(公告)号：EP0919661A1

    公开(公告)日：1999-06-02

    申请号：EP98204179.0

    申请日：1995-06-29

    申请人： BELOIT TECHNOLOGIES, INC. ,  Pulp and Paper Research Institute of Canada

    发明人： Shackford, Lewis D. ,  Miller, William J. ,  Roy, Brian P. ,  Van Lierop, Barbara ,  Berry, Richard M.

    IPC分类号： D21C9/16 ,  D21C9/10

    CPC分类号： D21C9/1026 ,  D21C9/1057 ,  D21C9/163

    摘要： A method for bleaching cellulosic and lignocellulosic pulp using hydrogen peroxide as a bleaching reagent, utilizes a three stage reaction, viz. two short high temperature peroxide bleaching steps (50,160) at a pressure sufficient to suppress boiling and an interstage treatment (90) including a longer atmospheric pressure reduced temperature bleaching step. The two short peroxide bleaching stages include the steps of introducing pulp, at a consistency of 10%-18%, to a mixer (20,130) in which the pulp is heated to a temperature above 100 degree Celsius; adding sufficient sodium hydroxide (32,142) to bring the pulp to a pH of 8.5; adding sufficient hydrogen peroxide (33,143) to equal from about 0.5%-5.0%, by weight, of the pulp; passing the pulp through a pressurized reactor column (50,160) at a rate providing a reaction time in the column of less than 45 minutes, cooling the pulp and discharging the cooled pulp to a washer. It may be desirable to introduce the pulp to a mixer and add alkali to reactivate residual hydrogen peroxide by bringing the pulp to a pH of at least 9 after the first bleaching stage, deposit the pulp in a reaction tower and allowing the reaction to proceed until a substantial portion of the residual hydrogen has been consumed.

    摘要翻译： 使用过氧化氢作为漂白试剂漂白纤维素和木质纤维素纸浆的方法采用三步反应，即， 在足以抑制沸腾的压力下进行两个短的高温过氧化物漂白步骤（50,160）和包括较长的大气压降低温度漂白步骤的级间处理（90）。 两个短的过氧化物漂白阶段包括将纸浆以10％-18％的浓度引入到其中将纸浆加热至高于100摄氏度的混合器（20,130）的步骤; 加入足够的氢氧化钠（32,142）使纸浆的pH值达到8.5; 将足够的过氧化氢（33,143）加入至纸浆重量的约0.5％-5.0％ 使纸浆通过加压反应器塔（50,160），其速率在柱内提供少于45分钟的反应时间，冷却纸浆并将冷却的纸浆排出到洗衣机中。 可能需要将纸浆引入混合器中并通过在第一漂白阶段使纸浆至少为9的pH将碱添加到碱中以再活化剩余的过氧化氢，将纸浆沉积在反应塔中并允许反应进行直至 剩余氢的大部分已被消耗。

    DETERMINATION AND CONTROL OF EFFECTIVE ALKALI IN KRAFT LIQUORS BY IR SPECTROSCOPY
    33.
    发明公开
    DETERMINATION AND CONTROL OF EFFECTIVE ALKALI IN KRAFT LIQUORS BY IR SPECTROSCOPY 失效
    确定并通过红外光谱法的手段控制硫酸盐法制浆的解决方案的有效碱。

    公开(公告)号：EP0649531A1

    公开(公告)日：1995-04-26

    申请号：EP93915594.0

    申请日：1993-07-06

    申请人： Pulp and Paper Research Institute of Canada

    发明人： LECLERC, Denys F. ,  HOGIKYAN, Robert, M.

    IPC分类号： D21C3 ,  D21C7 ,  G01N21 ,  G01N33

    CPC分类号： D21C3/02 ,  D21C7/12 ,  G01N21/3577 ,  G01N33/34

    摘要： A direct monitoring and control method is provided for on-line measurement of effective alkali, carbonate, sulfate and thiosulfate concentrations in process liquors for the production of kraft pulp. The control method eliminates frequent sampling, and the need for frequent equipment maintenance. The method includes the steps of withdrawing samples of a liquor from the kraft manufacturing process, subjecting the samples to infrared spectrophotometry at predetermined wave numbers to produce peak-absorbance measurements relative to a background spectrum of water, determining peak absorbance for different alkali concentrations, correlating relationships between the peak-absorbance measurements of samples with the peak absorbance for different alkali concentrations to determine optimum effective alkali in the samples, and controlling at least one process parameter to obtain effective alkali of the liquor.

    METHOD AND APPARATUS FOR MANUFACTURE OF SMOOTH AND GLOSSY PAPERS
    35.
    发明公开
    METHOD AND APPARATUS FOR MANUFACTURE OF SMOOTH AND GLOSSY PAPERS 失效
    方法和设备平滑而有光泽纸的生产。

    公开(公告)号：EP0483183A1

    公开(公告)日：1992-05-06

    申请号：EP90910498.0

    申请日：1990-07-19

    申请人： Pulp and Paper Research Institute of Canada

    发明人： PIKULIK, Ivan, I.

    IPC分类号： D21F3 ,  D21F5 ,  F26B13

    CPC分类号： D21F3/0281 ,  D21F5/04

    摘要： L'invention concerne un procédé et une machine de séchage de bande fibreuse, adaptés notamment à des machines à vitesse rapide produisant des papiers d'impression. On obtient des vitesses de séchages élevées par compression ultérieure des deux surfaces de la bande humide (5) sur des cylindres sécheurs (1, 2) de grand diamètre chauffés entre 100 et 150 °C. Dans le premier pincement, la bande (5) est pressée sur un cylindre sécheur (1) par un rouleau de presse feutré (3) tandis qu'un rouleau lisse non feutré (4) presse ladite bande (5) sur le second sécheur (2). L'invention, lorsqu'on la met en oeuvre, permet d'obtenir des vitesses de séchage sensiblement supérieures à celles de trains de séchage classiques. Le produit obtenu selon l'invention est 30 % plus résistant que le papier non calandré séché de manière classique, et sans calandrage présente un lissé et un satiné similaires à ceux de papiers classiques calandrés.

    Lumen-loaded paper pulp, its production and use
    39.
    发明公开
    Lumen-loaded paper pulp, its production and use 失效
    腔内充满纸浆，其制备方法和用途。

    公开(公告)号：EP0042234A1

    公开(公告)日：1981-12-23

    申请号：EP81302435.3

    申请日：1981-06-02

    申请人： Pulp and Paper Research Institute of Canada

    发明人： Green, Harold Vaughan ,  Fox, Thomas Joseph ,  Scallan, Anthony Michael

    IPC分类号： D21D3/00

    CPC分类号： D21H17/68 ,  D21C9/004 ,  D21H17/35 ,  D21H17/675 ,  D21H23/16

    摘要： Paper of improved properties is produced from pulp in which filler is selectively and substantially entirely loaded within the fiber lumens by vigorously agitating a suspension of pulp and filler until the lumens become loaded with filler, separating the residual suspended filler from the loaded fibers and vigorously and turbulently washing the pulp (e.g., under conditions of shear, preferably with an aqueous solution of a filler aid, e.g., alum) until substantially all of the filler on the external surfaces of the fibers is removed. This procedure achieves high filler levels within the lumen. Retention on the paper machine is increased by the use of such lumen-loaded fibers. The papers have an enhanced combination of strength and optical properties.

    Method and system for detecting plate clashing in disc refiners
    40.
    发明公开
    Method and system for detecting plate clashing in disc refiners 失效
    Verfahren und Vorrichtung zum Entdecken von Plattenklirren在einerScheibenmühle。

    公开(公告)号：EP0006315A1

    公开(公告)日：1980-01-09

    申请号：EP79300954.9

    申请日：1979-05-25

    申请人： Pulp and Paper Research Institute of Canada ,  Price (Nfld.) Pulp & Paper Limited

    发明人： Rogers, James Hubert ,  Butler, Donald James

    IPC分类号： G08B21/00 ,  D21D1/30

    CPC分类号： D21D1/002 ,  D21D1/30 ,  G01H1/00

    摘要： A method and system for the detection of plate clashing in disc refiners and provided herein. The signal from either an acoustic or vibration monitor (12) is processed through a filter (14) which isolates those frequencies at which a significant increase in signal level is known to occur during a clash or are generated in association with imminent or actual plate clashing. The signal level of the filtered data is compared with a threshold level (19) at which protective action must be taken. Protection can be automatically initiated by the plate clash detection system; alternatively, it can be done manually by an operator, using the detection system as a warning device.

    摘要翻译： 本文提供的用于检测盘式精炼机中板碰撞的方法和系统。 来自声学或振动监测器（12）的信号通过滤波器（14）进行处理，滤波器（14）隔离在冲突期间已知信号电平显着增加的频率，或者与即将发生的或实际的板冲突相关联地产生 。 滤波数据的信号电平与必须采取保护动作的阈值电平（19）进行比较。 保护可以由板碰撞检测系统自动启动; 或者，可以由操作者手动完成，使用检测系统作为警告装置。