Improving the Efficiency of the Process of Making Paperboard with Paper Additives
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概要
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For the purpose of improving the efficiency of making paperboard, it is effective to improve water drainage by means of making suitable flocculation using drainage aids. However, normal linear polymer having high molecular weight often causes too large flocculation. It causes not only bad formation but also inefficiency at the press and dryer part and deterioration of paper properties. In order to improve such problems, we have developed Himoloc FR-740 and new drainage aids (FR-type and DR-type) using our original synthesizing method without controlling molecular weight simply. FR-type is multi-compound polymers, having very wide range of molecular weight and charge density. Therefore, FR-type includes both high molecular weight polymer having flocculation ability and low molecular weight polymer having coagulation ability. When FR-type drainage aids are used, floc is formed uniformly and not too large. So, FR-740 can improve water drainage without having a bad influence on other property and efficiency. In order to cope with various conditions of the paperboard, we also have developed new DR-type drainage aids. Their flocculation force is designed to be more than FR-740 and less than normal retention aids. Because of introducing intramolecular interaction, new DR-type drainage aids have different characterization from normal linear polymers having high molecular weight. We expect high ability of water drainage without a bad influence on formation and paper strength in spite of increasing flocculation ability. In this report, we show the performances of these drainage aids.
- 紙パルプ技術協会の論文
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