Roles of Retention and Drainage Aids in Papermaking Process

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  • 抄紙工程における歩留剤，濾水剤の役割
  • ショウシ コウテイ ニ オケル ブドマリザイ,リョスイザイ ノ ヤクワリ

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Abstract

<p>In papermaking process, retention and drainage aids provide many benefits such as improving sheet quality, enhancing productivity, and extending life of fabric.</p><p>The roles of these aids have become more and more important because the rate of fines and filler in furnish has increased as the papermaking environment has changed.</p><p>Retention and drainage aids have ability to coagulate and flocculate pulp and filler through ionic interaction mainly. However, too large floc worsens the formation, paper strength and dewatering. Therefore, suitable chemicals and systems are required. Polyacrylamide, water-soluble synthetic polymer, is one of the typical chemicals because it can adjust the molecular weight, ionicity and charge density easily.</p><p>The technology of retention and drainage system made advanced to address acid-free papermaking, increasing speed of paper machines and reduction of fresh water. However, in recent years, more complicated and difficult issues in papermaking process have been increasing, for example deterioration of runnability caused by low-quality materials and demand for maintaining sheet quality despite the basis weight reduction. We have solved these problems by applying characteristic pitch control agent in combination with retention aid and new retention aid developed by our unique “selection-technology”.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 75 (10), 891-896, 2021

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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