Calendering Effects on Paper Properties.

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  • カレンダの紙質に与える影響　　特にホットカレンダーリングについて
  • カレンダー ノ シシツ ニ アタエル エイキョウ トクニ ホット カレンダー
  • 特にホットカレンダーリングについて

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Abstract

Calendering plays a very important role in determining the final paper properties. In order to minimize the mechanical stress applied on paper and to acquire the desired paper properties, number of nips and nip pressure have been reduced recently.<BR>These techniques aim at reducing mechanical damages of paper, and obtaining smooth surfaces, as well as maintaining adequate physical properties of paper such as strength and dimensional stability.<BR>The hot calendering roll and the crown control roll have been developed to meet these requirements.<BR>This paper summarizes the past studies of calendering effects on paper properties, and introduces the research at PPRIC on hot calendering, and furthermore describes different kinds of hot calendering rolls and temperature-gradient calendering.<BR>Proper controls of basis weight and moisture profile in cross machine direction at the inlet of a calender are the prerequisites even in hot calendering and temperature gradient calendering.<BR>Lack of these conditions will lead to anisotropic expansion of paper.<BR>A method for calculating the magnitude of anisotropic expansion and its effect on nip pressure is presented.<BR>Appropriate choise of calendering method can minimize paper strength loss and can decrease the use of costly papermaking furnishes, which will bring us economic returns.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 37 (10), 865-882, 1983

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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