Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 5, Issue 10
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  • Analysis of Bowing Phenomenon in Successive Stretching of Biaxially Oriented Film
    Reduction of Bowing Distortion
    Chisato NONOMURA, Toshiro YAMADA
    1993 Volume 5 Issue 10 Pages 703-708
    Published: October 20, 1993
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.5.703
    JOURNAL FREE ACCESS
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    In order to reduce the bowing distortion which occurs in the tentering process of film-making, the effect of the processing condition was examined. The following results were obtained for poly (ethylene terephthalate) film.
    (1) Cooling the film below its glass transition temperature after stretching it in transverse direction greatly reduces the bowing distortion. The extent of reduction increases with the length of the cooling zone.
    (2) Once the film was cooled after stretching, the bowing distortion is almost independent of the thermosetting temperature between 200°C and 250°C.
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