Papermaking process
    1.
    发明授权
    Papermaking process 失效
    造纸过程

    公开(公告)号:US4961825A

    公开(公告)日:1990-10-09

    申请号:US411241

    申请日:1989-09-22

    摘要: In the production of paper or pulp sheets from a paper stock, a binder is added which comprises cationic and anionic components to improve the paper characteristics and the stock characteristics, such that increased retention and a more readily dewatered stock are obtained.The anionic component consists of colloidal anionic particles having at least one surface layer of aluminum silicate or aluminum-modified silicic acid, such that the surface groups of the particles contain silicium and aluminum atoms in a ratio of from 9.5:0.5 to 7.5:2.5.The cationic component consists of cationic carbohydrate having a degree of substitution of 0.01-1.0.

    摘要翻译: 在从纸料制造纸或纸浆片材中,添加包含阳离子和阴离子组分的粘合剂以改善纸张特性和储存特性,从而获得增加的保留量和更容易脱水的原料。 阴离子组分由具有至少一个硅酸铝表面层或铝改性硅酸的胶体阴离子颗粒组成,使得颗粒的表面基团含有比例为9.5:0.5至7.5:2.5的硅和铝原子。 阳离子组分由取代度为0.01-1.0的阳离子碳水化合物组成。

    Paper manufacturing process, and papers obtainable by means of that
process
    3.
    发明授权
    Paper manufacturing process, and papers obtainable by means of that process 失效
    纸张制造过程和通过该过程可获得的纸张

    公开(公告)号:US5262006A

    公开(公告)日:1993-11-16

    申请号:US741528

    申请日:1991-08-12

    摘要: Process in manufacturing paper wherein stock is prepared using cellulose fiber material which contains calcium sulfate (gypsum). said material being disintegrated in an aqueous medium in order to form part of the stock for the paper to be produced. The characterizing feature of the process is that(a) carbonate ions and/or hydrogen carbonate ions (CO.sub.3.sup.2- or resp. HCO.sub.e.sup.- ) are supplied to the aqueous medium, and(b) the pH in the aqueous medium is adjusted to an alkaline value so that calcium carbonate precipitates and forms part of the suspension.There are overall major advantages provided by the process in the context of applying gypsum coatings on paper, inasmuch as broke can be reused in the process without any troublesome gypsum precipitation. Moreover a new grade of coated paper is described, the characterizing feature of this paper being that the filler of the base paper consists entirely or partly of precipitated calcium carbonate (PCC) and that the pigment of the coating layer consists entirely or partly of calcium sulfate.

    摘要翻译: PCT No.PCT / SE90 / 00037 Sec。 371日期1991年8月12日 102(e)日期1991年8月12日PCT 1990年1月16日PCT PCT。 公开号WO90 / 09483 日期1990年8月23日。制造纸的方法,其中使用含有硫酸钙(石膏)的纤维素纤维材料制备原料。 所述材料在水性介质中分解,以形成待生产纸的原料的一部分。 该方法的特征在于(a)将碳酸根离子和/或碳酸氢根离子(CO32-或相应的HCO 3 - )供给到水性介质中,和(b)将水性介质中的pH调节至碱 使得碳酸钙沉淀并形成悬浮液的一部分。 在石膏涂料应用于纸上的过程中,总体上有很大的优点,因为在这个过程中可以重复使用破碎物,而没有麻烦的石膏沉淀。 此外,本文描述了新型涂层纸,其特征在于原纸的填料完全或部分由沉淀碳酸钙(PCC)构成,涂层的颜料完全或部分由硫酸钙组成 。

    Papermaking process
    4.
    发明授权
    Papermaking process 失效
    造纸过程

    公开(公告)号:US4980025A

    公开(公告)日:1990-12-25

    申请号:US380737

    申请日:1989-07-17

    摘要: In a process for making paper from an aqueous paper pulp, especially a pulp containing bleached/unbleached mechanical pulps or unbleached chemical pulps, a combination of chemicals is added for improving drainage and retention. As drainage-and retention-improving aids are added a cationic polyacrylamide and a sol of colloidal inorganic particles having at least one surface layer of aluminium silicate or aluminum-modified silicic acid.

    摘要翻译: 在从含水纸浆,特别是含有漂白/未漂白的机械纸浆或未漂白化学纸浆的纸浆中制造纸张的方法中,添加化学品的组合以改善排水和保留。 作为排水和保留改进助剂,添加阳离子聚丙烯酰胺和具有至少一个硅酸铝表面层或铝改性硅酸的胶态无机颗粒溶胶。