成形加工
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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18 巻, 12 号
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日本の大学・試験・研究機関の研究 : 148
海外研究機関の紹介 : 77
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論文
  • 反応・溶媒除去を伴うポリイミドフィルムのテンター内加熱時のボーイング現象の予測
    伊藤 利尚, 山田 敏郎, 杉原 元樹, 森 計吾
    2006 年 18 巻 12 号 p. 883-889
    発行日: 2006/12/20
    公開日: 2009/11/18
    DOIhttps://doi.org/10.4325/seikeikakou.18.883
    ジャーナル フリー
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    In this report, the bowing behavior and the state of stress in PI film during tenter heating process were predicted by a finite element method (FEM). In the FEM analysis, the authors focused especially on the first zone of tenter heating where the shrinking stress and changes in film hardness arise resulting from removal of residual solvents and chemical reaction (imidation). The analysis was carried out under the assumption that the PI film in the tenter heating was linear-elastic. From the orientation measurements of PI film, which underwent the heating at the tenter 1st zone, the angle of orientation axis at the film edges tilted approximately 45 degrees from the machine direction (MD) and became level with the transverse direction (TD) at film center. These results comparatively agreed with the direction of the maximum principal stress calculated by FEM. Moreover the FEM results revealed reverse bowing around the entrance of tenter.
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  • ポリエチレンテレフタレートの結晶化が及ぼす機械的物性の変化
    日下石 進, 紺野 慎行, 石川 優
    2006 年 18 巻 12 号 p. 890-894
    発行日: 2006/12/20
    公開日: 2009/11/18
    DOIhttps://doi.org/10.4325/seikeikakou.18.890
    ジャーナル フリー
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    The effect of the processes of crystallization, which are the annealing from the solid state and the slow cooling from the molten state, on the mechanical properties and morphology of the PET (polyethylene telephthalate) resin was examined. It was found that the increase of crystallinity due to the annealing takes place at 120°C and the crystallization due to the slow cooling takes place at 220°C. Tg and Young's modules were increased when the crystallinity of PET was increased with crystallization by the annealing or the cooling, however, there were no discrepancies of the thermal and mechanical properties. These results suggest that the improvement of the thermal and mechanical properties can be achieved by the adjustment of annealing or cooling process of the mold on the injection molding.
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