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68 条记录 (耗时 0.02 秒)

    METHOD AND APPARATUS FOR MANUFACTURE OF SMOOTH AND GLOSSY PAPERS
    11.
    发明授权
    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：EP0483183B1

    公开(公告)日：1994-03-16

    申请号：EP90910498.6

    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： D21F5/04 ,  D21F3/02

    CPC分类号： D21F3/0281 ,  D21F5/04

    摘要： A method and a machine are described for drying of fibrous web, especially suitable for high speed machines producing printing papers. High drying rates are obtained by subsequently pressing the two surfaces of wet web (5) onto two large diameter dryer cylinders (1, 2) heated to between 100 and 150 °C. In the first nip, the web (5) is pressed on the dryer cylinder (1) by a felted press roll (3), while an unfelted smooth roll (4) is used to press the web (5) on the second dryer (2). Drying rates obtained when practicing the invention are substantially greater than those found in conventional dryer sections. The product obtained according to this method is 30 % stronger than the conventionally dried uncalendered paper, and without calendering has a smoothness and gloss similar to those of calendered conventional papers.

    Method and apparatus for the rapid consolidation and/or drying of porous webs
    12.
    发明公开
    Method and apparatus for the rapid consolidation and/or drying of porous webs 失效
    一种用于快速按压和/或干燥多孔网状物的方法和装置。

    公开(公告)号：EP0296730A2

    公开(公告)日：1988-12-28

    申请号：EP88305140.1

    申请日：1988-06-06

    申请人： Pulp and Paper Research Institute of Canada

    发明人： Sparkes, Donald G.

    IPC分类号： D21F3/02 ,  D21F5/02

    CPC分类号： D21F3/0281 ,  D21F5/02 ,  D21F5/024 ,  D21F5/048

    摘要： There is taught a method and apparatus for a drying of a continuous moist web (18) such as paper wherein the web is passed through a nip formed of two moving surfaces (10,16), one of these surfaces (10) being a relatively impermeable material heated to a temperature of at least 120°C, the other surface (16) being formed of a relatively porous material and being maintained at a temperature below 100°C, while maintaining a pressure on the moist web sufficient to prevent blowoff.

    摘要翻译： 教导了用于连续湿纸幅（18）的干燥的方法和设备：如纸worin幅材通过形成在两个移动表面（10,16），论文表面中的一个（10）的辊隙通过作为一个相对较 加热到至少120℃的温度下不可渗透的材料，其它的表面（16）形成了一个相对多孔材料制成，并保持在低于100℃的温度，同时保持湿润卷筒纸足以防止吹上的压力。

    EPICHLOROHYDRIN BASED POLYMERS CONTAINING PRIMARY AMINO GROUPS AS ADDITIVES IN PAPERMAKING
    13.
    发明公开
    EPICHLOROHYDRIN BASED POLYMERS CONTAINING PRIMARY AMINO GROUPS AS ADDITIVES IN PAPERMAKING 审中-公开
    基于环氧氯丙烷含伯氨基的聚合物作为造纸添加剂

    公开(公告)号：EP1720931A1

    公开(公告)日：2006-11-15

    申请号：EP05714502.1

    申请日：2005-02-23

    申请人： Pulp and Paper Research Institute of Canada

    发明人： ANTAL, Miroslav ,  PIKULIK, Ivan I. ,  HUA, Xujun

    IPC分类号： C08G73/02 ,  D21H21/14 ,  D21H17/56 ,  C08J5/00

    CPC分类号： D21H17/56 ,  C08G73/02 ,  C08G73/0206 ,  C08G73/022 ,  C08G73/024 ,  C08G73/0286 ,  D21H17/10 ,  D21H17/52 ,  D21H21/10 ,  D21H23/04

    摘要： Processes for preparing water-soluble papermaking polymer additives having a multitude of free amino groups effective to form cationically charged complexes with components of a pulp suspension are described, comprising: reacting ammonia and epichlorohydrin (ECH) with ammonia in excess to yield a starburst polymer with a molecular weight of 3000-106; reacting ECH and ammonia to produce tris(3-chloro-2-hydroxypropylamine) and reacting this with a diamine to yield a water-soluble branched polymer with a molecular weight of 3000-106; reacting polyepichlorohydrin with a variety of amines, a polyol or ammonia to yield linear polymers, cross-linked polymers and polyamines. The additives are used as agents for improving retention, drainage, product strength and paper machine operation in paper manufacture. Under neutral or acidic conditions these primary amino groups become cationic, which assures good adsorption of the polymer onto anionic fibres and fines used for production of paper or paperboard. By adsorbing on several fibres or fines, the polymer can increase the retention of fines and fillers. Primary amino groups of these polymers can also form chemical bonds with carbonyl groups of cellulose, lignin and hemicellulose, which are especially abundant in the fibres and fines of mechanical pulps. The cross-linking of fibres and fines by chemical bonds can increase the initial strength of wet web and the strength of rewetted paper.

    USE OF DENDRIMERIC POLYMERS FOR THE PRODUCTION OF PAPER AND BOARD
    14.
    发明授权
    USE OF DENDRIMERIC POLYMERS FOR THE PRODUCTION OF PAPER AND BOARD 失效
    使用树枝状聚合物用于纸张和纸板生产

    公开(公告)号：EP0986672B1

    公开(公告)日：2002-11-27

    申请号：EP98922553.7

    申请日：1998-05-22

    申请人： Pulp and Paper Research Institute of Canada

    发明人： ALLEN, Lawrence, H. ,  POLVERARI, Marco, S.

    IPC分类号： D21H21/10 ,  D21H17/56

    CPC分类号： D21H17/56 ,  C08L101/005 ,  D21H21/10

    摘要： A papermaking stock and a method for improving the retention of pulp fines, mineral fillers, dispersed wood resin, and/or synthetic hydrophobic stickies and cellulose fibers in a cellulosic fiber sheet, employs dendrimeric polymers for increasing the retention of fines, fillers, dispersed hydrophobic particles, and cellulosic fibers. The application in the paper industry provides a means of (1) increasing the retention of fillers in paper and decreasing the loss of filler materials in white water waste from papermaking; (2) increasing the retention of cellulosic fines and fibers in the paper-making process; increasing drainage on the paper machine; and (3) removing a significant fraction of the wood resin, plastics, and stickies from the process stream thus enabling a greater extent of reuse of filtrates and, hence, less effluents from mills, fewer problems from wood resins such as deposit formation, loss of strength of product, and contamination of product with dirt particles.

    PEROXIDE BLEACHING PROCESS FOR CELLULOSIC AND LIGNOCELLULOSIC MATERIAL
    18.
    发明授权
    PEROXIDE BLEACHING PROCESS FOR CELLULOSIC AND LIGNOCELLULOSIC MATERIAL 无效
    方法过氧化物漂白纤维素和木质纤维材料

    公开(公告)号：EP0797703B1

    公开(公告)日：2000-02-09

    申请号：EP95926123.1

    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 ,  D06L3/02

    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 two-step reaction, viz. a short high temperature step at a pressure sufficient to suppress boiling and a longer atmospheric pressure reduced temperature step to consume a substantial portion of the hydrogen peroxide remaining after the short phase. The method includes the steps of introducing pulp (15), at a consistency of 10 %-18 %, to a mixer (100) in which the pulp is heated to a temperature above 100 DEG C; adding sufficient sodium hydroxide to bring the pulp to a pH of 8.5; adding sufficient hydrogen peroxide (36) to equal from about 0.5 %-5.0 %, by weight, of the pulp; passing the pulp through a pressurized reactor column (400) at a rate providing a reaction time in the column of between 1 and 30 minutes; and depositing the pulp in a reaction tower and allowing the reaction to proceed for 1-5 hours until a substantial portion of the residual hydrogen peroxide has been consumed. 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 between bleaching steps.

    A selectively reflective polymer moulded article and a process for producing the same
    19.
    发明公开
    A selectively reflective polymer moulded article and a process for producing the same 失效
    高分子聚合物和Verfahren zu deren Herstellung

    公开(公告)号：EP0926217A1

    公开(公告)日：1999-06-30

    申请号：EP97120632.1

    申请日：1997-11-25

    申请人： DAICEL CHEMICAL INDUSTRIES, LTD. ,  Pulp and Paper Research Institute of Canada

    发明人： Shimamoto, Shu ,  Gray, Derek Geoffrey

    IPC分类号： C09K19/38

    CPC分类号： C09K19/3819 ,  G02B5/3016 ,  Y10T428/1086

    摘要： This invention provides, in an easy manner, a film-like moulded article which shows a selective reflection of a wavelength and circularly polarized light. A suitable environment for formation of a liquid crystalline phase is prepared by forming a moulded article (thin film-like moulded article) using a cellulose derivative which can form the liquid crystalline phase (e.g. a water-insoluble cellulose derivative such as ethyl cellulose), and allowing the moulded article to absorb a highly volatile organic solvent by contact with its vapour. After formation of the liquid crystalline phase, removal of the organic solvent provides the object moulded article. The thin film-like moulded article can be employed for an optical element of a circular polarized light-generator or a decoration material.

    摘要翻译： 本发明以容易的方式提供了表现出波长和圆偏振光的选择反射的膜状模塑制品。 通过使用可以形成液晶相的纤维素衍生物（例如水不溶性纤维素衍生物，如乙基纤维素）形成模塑制品（薄膜状模塑制品）来制备用于形成液晶相的合适环境， 并且允许模制品通过与其蒸气接触而吸收高挥发性有机溶剂。 在形成液晶相后，除去有机溶剂提供目标模塑制品。 薄膜状成型体可以用于圆偏振光发生器或装饰材料的光学元件。