Effect of Stirring Operation on Quality of Molding Product of Unsaturated Polyester Resin

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  • HOJO Hidemitsu
    Department of Industrial Engineering and Management, College of Industrial Technology, Nihon University
  • ARAI Kazuyoshi
    Department of Mechanical Engineering, College of Engineering, Hosei University
  • ONO Shigeru
    Department of Industrial Engineering and Management, College of Industrial Technology, Nihon University
  • MURAKAMI Yuki
    Department of Industrial Engineering and Management, College of Industrial Technology, Nihon University Manufacturing Technology Integration Laboratory, Dai Nippon Printing Co.Ltd.

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Other Title
  • 不飽和ポリエステル樹脂成形品の品質に及ぼす攪拌操作の影響
  • 不飽和ポリエステル樹脂成形品の品質に及ぼす撹拌操作の影響
  • フホウワ ポリエステル ジュシ セイケイヒン ノ ヒンシツ ニ オヨボス カクハン ソウサ ノ エイキョウ

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Description

Deviations in material properties such as strength is usually experienced in the testing of plastics. One of the factors causing nonuniformity or heterogeneity in a molded resin as well as in a bulk epoxy cast product, is considered to be the mixing operation in compounding process. Using the reaction of an unsaturated polyester resin with a hardener and a stirring vessel equipped with 6-blade paddle, the effect of mixing factors on the quality of the cast resins was investigated by evaluating glass transition temperatures. As the result, the total or average quality of the molded resin was largely improved by the convective effect with increasing stirring speed. But, as for the local quality, the nonuniformity was generated in both the region of the impeller tip near the center and of the wall-side of the vessel, even if the stirring speed was higher. The distribution, of course, became wider with decreasing stirring speed. Thus, the equalization of the material quality was not attained. On the other hand, though the average quality of the molded resin was somewhat improved by increasing the stirring speed or mixing time, its distribution became wider. The quality, in particular, in the lower region near the vessel bottom was affected remarkably by the mixing time at a lower stirring speed, because of molecular diffusion of a hardener. In addition, to examine the state of flow and the mixing process, the simulation of flow by numerical analysis and the visualization experiment were performed. The existence of heterogeneity in the molded resin was thus confirmed in spite of stirring.

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