New On-line Fiber Orientation Sensor System Based on Anisotropy of Dielectric Constant

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Other Title
  • 誘電率の異方性測定を利用した新しいオンライン繊維配向計の開発と実証実験
  • ユウデンリツ ノ イホウセイ ソクテイ オ リヨウ シタ アタラシイ オンライン センイ ハイコウケイ ノ カイハツ ト ジッショウ ジッケン ショウライ ノ センイ ハイコウ ジドウ セイギョ オ メザシテ
  • Its Development and Proof Experiments
  • 将来の繊維配向自動制御をめざして

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Abstract

A new method for measuring the fiber orientation is developed. Measuring the fiber orientation is very important from the viewpoint of the quality control of paper, non-woven fabrics and other plastic sheets. The dimensional stability of paper at various temperatures, for instance, is known to be strongly influenced by the fiber orientation.<BR>This new method is based on the measurement of anisotropy of dielectric constant of paper that is caused by the anisotropy of electronic polarization of cellulose molecules. The microwave dielectric resonators have been employed as a measuring tool in this method, and the fiber orientation direction is determined as the one along with the direction of the maximum dielectric constant. The difference between the maximum value and the minimum value of the dielectric constants reflects the degree of orientation.<BR>The fundamental performance of our system was proved by the static measurement of PET films, and the dynamic measurements were done at a speed of 1, 000m/min by using our high-speed testcoating machine.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 57 (2), 224-230,022, 2003

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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