Floc Structure and Flow Properties of Pulp Fiber Suspensions
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概要
- 論文の詳細を見る
The rheological properties of pulp and PET fiber suspensions were measured with a parallel-plates type rheometer. A high speed CCD camera was used to observe the changes in the floc structures that were produced during the rheological measurement. The flow curves of the pulp fiber suspensions showed Newtonian flow in the low shear rate range. With increasing shear rate, the shear stress increased and then became unstable, namely, jumps in the flow curves were observed, which are due to the formation of fiber flocs. At a higher shear rate, the flocs disappeared and the systems showed Newtonian flow again. The flow curves of the polyethylene terephthalate (PET) fiber suspensions showed non-Newtonian flow even in the low shear rate range. We found that the uniform distribution of fibers became uneven and then the flocs began to form at the critical shear rate; and over the critical shear rate, the fibers began to uniformly disperse again, i.e., the flocs disappeared. The two-dimensional fast Fourier transform (FFT) technique and Guinier approximation were used to obtain the radius of gyration, Rg, of the flocs. It is considered that the Rg of the flocs is useful to characterize the mechanism of fiber flocculation.
- 日本レオロジー学会の論文
著者
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Chen Bo
Photonics Research Group Microelectronics Division School Of Electrical And Electronic Engineering N
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Chen Bo
Key Laboratory Of Chemical Biology And Traditional Chinese Medicine Research (hunan Normal Universit
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Chen Bo
Division Of Forest And Biomaterials Science Graduate School Of Agriculture Kyoto University
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巽 大輔
京都大学大学院農学研究科森林科学
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TATSUMI Daisuke
Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University
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MATSUMOTO Takayoshi
Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University
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Tatsumi Daisuke
Division Of Forest And Biomaterials Science Graduate School Of Agriculture Kyoto University
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Chen B
Key Laboratory Of Chemical Biology And Traditional Chinese Medicine Research (hunan Normal Universit
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Matsumoto Takayoshi
Division Of Forest & Biomaterials Science Graduate School Of Agriculture Kyoto University
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