公开(公告)号：US5505819A

公开(公告)日：1996-04-09

申请号：US220563

申请日：1994-03-31

申请人： James A. De Witt ,  Donald T. Eadie ,  Gordon R. Hayes ,  Robert E. Monahan

发明人： James A. De Witt ,  Donald T. Eadie ,  Gordon R. Hayes ,  Robert E. Monahan

IPC分类号： D21H11/08 ,  D21H23/10 ,  D21H21/06

CPC分类号： D21H11/08 ,  D21H23/10 ,  Y10S162/11

摘要： A pulp furnish containing predominantly wood-containing fibers (mechanical) and natural calcium carbonate as a filler is formed into a paper in a paper forming section of a paper machine at a neutral pH in the range of 6.7 to 7.5. Bentonite plus a suitable polymer such as a polyacrylamide produces a pulp stock that has exceptionally high drainage characteristics particularly when used with chalk as the filler. The pH of the stock in the headbox is maintained at the desired level of pH 6.7-7.3 by monitoring the pH in the headbox and adjusting the flow of pH reducing and buffering agent, preferably phosphoric acid, into the pulp prior to the headbox to obtain the desired pH in the stock.

摘要翻译： 主要含木材纤维（机械）和天然碳酸钙作为填料的纸浆配料在造纸机的造纸部分中在6.7-7.5的中性pH下形成纸。 膨润土加上合适的聚合物如聚丙烯酰胺产生具有特别高排水性能的纸浆原料，特别是当与白垩作填料一起使用时。 流浆箱中原料的pH值通过监测流浆箱中的pH值并将pH降低和缓冲剂（优选磷酸）的流量调节到流浆箱之前的纸浆中，以保持在所需pH 6.7-7.3的水平，以获得 原料中所需的pH值。