首页> 外文会议>TAPPI coating/papermakers conference >Neutrally buffered precipitated calcium carbonate for use in newsprint mills where pH is maintained at levels below 7 without need for adding acid to the paper machine.
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Neutrally buffered precipitated calcium carbonate for use in newsprint mills where pH is maintained at levels below 7 without need for adding acid to the paper machine.

机译:中性缓冲沉淀的碳酸钙,用于新闻纸厂,其中pH维持在7水平,而无需向造纸机添加酸。

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A novel treatment of Precipitated Calum Carbonate (PCC) allows the use of this pigment as an extender, opacifyer and brightener in acid/neutral paper furnishes without addition of acids to reduce pH. By maintaining pH beow 7, the white water from paper machine is usable in the bleaching operations in addition, the alkaline darkening effects on the paper are reduced. The monitoring of pH and dissolved calcium levels in headbox, tray, and white water shows that there is minimal degradation in this pigment in slightly acidic furnish. Low levels of dissolved calcium produce less foaming and indicate that paper machine deposits should not be an issue. The continuous use of neutrally buffered PCC (up to 17
机译:沉淀的碱碳酸盐(PCC)的新方法允许使用该颜料作为酸/中性纸提供的酸/中性纸种,而不加入酸以减少pH。通过维持pH Beow 7,可以在漂白操作中使用来自造纸机的白色水,此外,纸张上的碱性变色效应降低。对头盒,托盘和白水中的pH和溶解钙水平的监测表明,在微酸性提供的这种颜料中存在最小的降解。低水平的溶解钙产生更少的发泡,并表明造纸机沉积不应该是一个问题。连续使用中性缓冲的PCC(最多17个

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