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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Ultrasonic treatment to improve the quality of recycled pulp fiber

Journal of Wood Science volume 46, pages 405–409 (2000)Cite this article

Abstract

The effect of ultrasound on the quality of recycled fibers was investigated. Ultrasound was applied to recycled pulp fiber suspension before ink removal by conventional flotation. The ultrasonic treatment induced an increase in the sedimentation volume of the fiber, which implies that the flexibility and bulkiness of the fiber increase. The water retention value of the ultrasonically treated fiber recovered from the loss caused by the recycling. These facts are due to a beating effect of the treatment. The paper sheets prepared from the ultrasonically treated fiber suspension showed higher sheet density, tensile strength, and brightness than that from an untreated fiber suspension. The process, which consists of ultrasonic treatment for 1 min following flotation deinking, requires about 1.4 times as much energy as the conventional flotation deinking process, but it induced 20% improvement in brightness. The results indicate that the ultrasonic treatment is effective in improving recycled fiber quality.

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Authors and Affiliations

  1. Graduate School of Agriculture, Kyoto University, 606-8502, Kyoto, Japan

    Daisuke Tatsumi & Takayoshi Matsumoto

  2. Wood Research Institute, Kyoto University, 611-0011, Uji, Japan

    Takashi Higashihara & Shin'ya Kawamura

Authors
  1. Daisuke Tatsumi
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  2. Takashi Higashihara
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  3. Shin'ya Kawamura
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  4. Takayoshi Matsumoto
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Correspondence to Takayoshi Matsumoto.

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Tatsumi, D., Higashihara, T., Kawamura, S. et al. Ultrasonic treatment to improve the quality of recycled pulp fiber. J Wood Sci 46, 405–409 (2000). https://doi.org/10.1007/BF00776405

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  • DOI: https://doi.org/10.1007/BF00776405

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