〈原著論文〉製紙用パルプ液のレオロジー特性

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  • セイシヨウ パルプエキ ノ レオロジー トクセイ
  • Rheological Properties of Wood Pulp Suspensions

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［Abstract］Rheological properties of wood pulp suspension flow in circular pipes have been investigated experimentally. In studying the flow mechanism, we mainly consider the yield stress that represents fiber network strength of flocculation of pulp fibers. The experimental results for five regimes, into which the flow had been classified on the basis of the behavior of pulp fibers and flow characteristics in the author’s recent work (2010), were correlated with the fiber consistency C_s in equation of the form τ=AC_s^m where τis the shear stress on the pipe wall and A and m are constant. The yield stresses are not dependent so much on the pipe diameter and become large with increase of the pulp-fiber consistency. The flocculation of pulp fibers starts to get loose near the pipe wall when a shear stress in excess of about four times the yield stress acts on the flowing fluid. The pressure loss in turbulent region becomes smaller than that for water as the pulp-fiber consistency increases.

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