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    • 2. 发明授权
    • Process for enhanced deposition and retention of particulate filler on
papermaking fibers
    • 用于增强颗粒填料在造纸纤维上的沉积和保留的方法
    • US5679220A
    • 1997-10-21
    • US375485
    • 1995-01-19
    • M. C. MatthewSanjay PatnaikPaul HartThomas Amidon
    • M. C. MatthewSanjay PatnaikPaul HartThomas Amidon
    • D21H17/64D21H17/67D21H17/70D21H21/10
    • D21H21/10D21H17/70D21H17/64D21H17/675
    • A method for enhancing the deposition and retention of particulate filler on papermaking fibers. In a first vessel, there is formed a slurry of papermaking fibers and in a second vessel there is formed a slurry of lime or its equivalent. The fiber slurry is at a consistency of not greater than about 5%. These separately formed slurries are thereafter combined with a gaseous precipitant in a flow reactor and under conditions whereby the gaseous precipitant is subjected to rapid shear and calcium carbonate is deposited in situ on the fibers. Unexpectedly, the reaction time for the formation and deposition of the calcium carbonate filler is very rapid. Control over the pH of the reactants in the reactor is achieved through the sequence of introduction of the reactants to the reactor. Also, through selection of the molar ratio of the gaseous precipitant and lime, the morphology of the calcium carbonate crystals may be controlled.
    • 一种增强颗粒填料在造纸纤维上的沉积和保留的方法。 在第一容器中形成造纸纤维的浆料,在第二容器中形成石灰浆或其等同物。 纤维浆料的稠度不大于约5%。 然后将这些单独形成的浆料与流动反应器中的气态沉淀剂混合,并在气态沉淀剂经受快速剪切的条件下,原位沉积在纤维上。 意外的是,碳酸钙填料的形成和沉积的反应时间非常快。 通过将反应物引入反应器的顺序来控制反应器中反应物的pH值。 此外,通过选择气态沉淀剂和石灰的摩尔比,可以控制碳酸钙晶体的形态。