MASS AND HEAT TRANSFER IN THE WET-SPUN ACRYLIC FIBERS DURING STRETCHING PROCESS

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  • Terada Koji
    Fibers & Fabrics Labs., Toray Industries, Inc. Pioneering R&D Labs., Toray Industries Inc.

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Other Title
  • アクリル繊維の延伸過程における熱と物質移動
  • アクリル センイ ノ エンシン カテイ ニ オケル ネツ ト ブッシツ イドウ アクリル センイ ノ コウゾウ ケイセイ ニ カンスル ケンキュウ 8

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Description

Mass and heat transfer in wet-spun acrylic fibers during stretching process was studied for monifilament and tow. Equations of diffusion and heat conduction were solved under boundary conditions that radius of monofilament of thickness of tow changes with distance. Numerical solutions were obtained for a set of given coefficients or diffusion and thermal diffusivities by using IBM 1130. Then the coefficients of diffusion and thermal diffusivities during streching process were obtained by comparing the experimental value with the calculated values. Using these values obtained, the concentration profile of the solvent and temperature profile in the filament or tow were obtained.<br>The results obtained are as follows;<br>(1) The diffusion coefficients of solvent during stretching process were 7×10-6 and 11×10-6cm2/sec for the monofilament and 9×10-5 and 13×10-5cm2/sec for the tow at the temperature of 70 and 90°C respectively. Apparent activation energies of diffusion were 5.6Kcal/mol for the filament and 4.5Kcal/mol for the tow. (2) The thermal diffusivities for the tow was 6×10-4_??_8.5×10-4cm2/sec at the temperature range of 70_??_90°C, which shows that heat transfer takes place more rapidly than mass transfer during the streching process of tow.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 29 (12), T532-T537, 1973

    The Society of Fiber Science and Technology, Japan

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