リサイクルパルプ手すき紙の液体転移特性

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  • Liquid Transfer Characteristics of Recycled Pulp Handsheets

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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.

収録刊行物

  • 紙パ技協誌

    紙パ技協誌 58 (4), 544-552, 2004

    紙パルプ技術協会

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