Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 11, Issue 12
Displaying 1-14 of 14 articles from this issue
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Index
Preface : Special Issue on Pursuit of the Ultimate Technology in Polymer Processing
Technical Note : Special Issue on Pursuit of the Ultimate Technology in Polymer Processing
Reports from Universities and Institutions in Japan
Reports from Oversea Universities and Institutions
Technical Reports
Reports of International Meeting
Memoir
Original Papers
  • Analysis of Deformation Mechanism with Re-stretching of Stretched Polymer Film
    Part II: Analyses of Deformation Band with Characteristic Curve and Re-orientation Behavior of Molecular Chain Axis with the Model of Plastic Slippage
    Yuan LIU, Sadao HIBI, Yuji SAKAMOTO, Eiji NAKANISHI, Kiyohisa TAKAHASH ...
    1999 Volume 11 Issue 12 Pages 993-1000
    Published: December 20, 1999
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.11.993
    JOURNAL FREE ACCESS
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    The characteristic curve and deformation band with yield points were investigated in off-axis angle stretching of strip-biaxially stretched poly (ethylene terephthalate) (PET) and isotactic polypropylene (it-PP) films. As the yield strain in polymers are much greater than those of metals, the change of orientation angles must be corrected for elastic-plastic deformation. The re-orientation mechanisms of chain axes during off-axis angle stretching may be divided into inter-lamella slippage and intra-lamella chain slip. The orientation of molecular chain axes by chain slip was much greater than that of inter-lamella slip.
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  • Change of Birefringence for Strip-biaxial Stretching of Syndiotactic Polypropylene and Sindiotactic 1, 2-Polybutadiene Films
    Yasushi HATANO, Tsuneo KAWAKAMI, Sadao HIBI, Keiji NAGAYA, Shuji KYOZU ...
    1999 Volume 11 Issue 12 Pages 1001-1006
    Published: December 20, 1999
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.11.1001
    JOURNAL FREE ACCESS
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    Strip-biaxially stretched syndiotactic polypropylene and syndiotactic 1, 2-polybutadiene films have been characterized by crystallinity and birefringence. Birefringence values for the polypropylene and polybutadiene films indicated positive and negative values, respectively. A good correlation between birefringence measurements by Abbe, polarization microscope and optical biregringence analyzer was obtained. Moreover, we confirmed the correlation between birefringence by Abbe and microwave measurements for the polypropylene film.
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  • Studies in Precision Injection Molding of Carbon Fiber Reinforced LCP
    A Practical Application to HDD Actuator E-block
    Toshio INOUE, Hiroyoshi YONETA, Akio HASHIMOTO
    1999 Volume 11 Issue 12 Pages 1007-1013
    Published: December 20, 1999
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.11.1007
    JOURNAL FREE ACCESS
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    This study is a part of an effort to develop precision injection molding of LCP. With the objection of replacing die-casted aluminum with injection molded LCP in an HDD actuator E-block application, modified design of experiment methods were used to investigate the significant factors involved both the injection machine operation process and the mold design. The preciseness was defined by the standard deviation (σ) of the arm tip heights of the E-block as measured on a laser scan micrometer, and values were compared with that of the die-casted aluminum E-block used in the HDD market. Among the machine process factors cut-off pressure was the most important one. Among the mold factors a cavity having a one-point gate located behind the carriage portion and a bridge connecting three arm tips, which functions as a slug-well and provides distortion resistance, gave the highest precision. For the purposes of high precision the mold geometry should permit molten LCP to flow with high symmetry. The value of the σ under the optimized process gave equal or better than that of aluminum E-block.
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