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In this study, the effects of ultrasonic cell crushing apparatus on the properties of recycling bamboo pulp fibers and handsheets were evaluated. Repeated recycling of bamboo fibers led to the reduction in paper tensile strength, but ultrasonic treatment resulted in strength enhancement. The ultrasonic treatment of pulp fibers was found to be preferred as regards strength improvement due to enhanced inter-fiber bonding strength. Pulp recycling also led to the reduction in pulp WRV (water retention value), while sonication was able to improve the WRV. Optical microscopic observations indicated that ultrasonic treatment was basically related to fiber swelling and fibrillation, which contributed to strength enhancement. (Received 21 September, 2015 ; Accepted 3 December, 2015) # corresponding author : 東北林業大学生物質材料科学技術教育部重点実験室 E-mail : nefujinhailan@163.com 超音波細胞粉砕機処理によるリサイクル 竹パルプシートの特性変化 金 海蘭・趙 駿衡・岡山 隆之・陳 礼輝・李 堅 *1東北林業大学生物質材料科学技術教育部重点実験室 *2江原大学山林環境科学大学製紙工学科 *3東京農工大学大学院農学研究院環境資源共生科学部門 *4福建農林大学材料工程学院 *1Key Lab of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, No.26 Hexing Road, Xiangfang District, Harbin 150040, China *2Dept. of Paper Science, College of Forestry Environmental Sciences, Kangwon National University, hyoza 2 dong 192-1, Chunchon-si 200-701, Korea *3Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan *4College of Material Engineering, Fujian Agriculture and Forestry University, No.15 Shangxiadian Road, Cangshan District, Fuzhou 350002, China Effects of Ultrasonic Cell Crushing Apparatus on the Properties of Recycling Bamboo Pulp Handsheets Hailan Jin , Junhyung Cho, Takayuki Okayama, Lihui Chen, and Jian Li J. Fiber Sci. Technol., 72(2), 44-48 (2016) doi 10.2115/fiberst.2016-0007 ©2016 The Society of Fiber Science and Technology, Japan 44 Journal of Fiber Science and Technology (JFST), Vol.72, No. 2 (2016) パルプ繊維における超音波処理は,パルプ懸濁液を 高速で処理する時,パルプ繊維のスピードと液体の inertia による速度差に起因したキァビテーション効 果により[7],パルプ繊維内部にフィプリル化が起こ り,繊維を膨潤させると考えられている[8].また, 針葉樹パルプ繊維の保水度を増加させ,紙強度をわず か増加させることも報告されている[9]. ここで,本研究では超音波処理をリサイクル竹パル プに応用し、パルプ繊維を超音波細胞粉砕機(超音波 によって細胞や細菌、組織などの破砕やホモジナイズ を行う装置) (Fig. 1)による超音波処理を行い,竹パ ルプ繊維および紙特性に及ぼす影響について研究を 行った.