Liquid Transfer Characteristics of Recycled Pulp Handsheets

DOI Web Site 25 References
  • Okayama Takayuki
    Laboratory of Recycled Resource Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Yoshinaga Nozomi
    Laboratory of Recycled Resource Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Hashizume Ken-Ichi
    Laboratory of Complex Functions of Materials, Faculty of Technology, Tokyo University of Agriculture and Technology

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Other Title
  • リサイクルパルプ手すき紙の液体転移特性

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Abstract

Structural characteristics of chemical pulp fibers are irreversibly changed by recycling. The change of the surface behavior of a single pulp fiber during recycling was characterized by measuring the contact angle using appropriate test liquids. A remarkable increase in the contact angle of water was found after recycling. Recycling treatment did not substantially change the surface free energy of the fiber. However, the base parameter of the surface free energy decreased with recycling, particularly that based on free-drying at high temperature.<BR>Two types of penetration measurements were designed to measure the rate of vertical (Z direction) and lateral (X-Y direction) liquid penetrations into paper. The rate of water penetration increased with recycling, and correlated with a porous structure in the recycled pulp handsheet. The tortuosity factor for the handsheet was calculated using the Lucas-Washburn equation. The recycled pulp gave smaller tortuosity factors of the handsheet compared with the virgin pulp.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 58 (4), 544-552, 2004

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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