Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 26, Issue 2
Displaying 1-13 of 13 articles from this issue
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Index
Foreword
Technical Notes : Special Issue on Sound Insulation
Technical Report
Report from Universities and Institusions in Japan : 203
Report from Overseas
Topic on Products and Technologies
Original Papers
  • Effect of Heater Form on Heat-sealed Parts of Plastic Film
    Yasuo Hashimoto, Yumi Hashimoto, Kazushi Yamada, Ken Miyata, Satoshi U ...
    2014 Volume 26 Issue 2 Pages 88-92
    Published: 2014
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.4325/seikeikakou.26.88
    JOURNAL FREE ACCESS
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    Plastic bags are used for containing and transporting goods such as foods, produce, powders, ice, magazines, comic books, chemicals and waste. Most plastic bags are heat sealed together. However, sometimes, accident occur due to poor heat sealing for complicated parts such as gusset bags. It is very important to investigate heat sealing technique for complicated bags. In this research, we demonstrate the good heat sealing properties for gusset bags by using the braid heater with a small diameter wire of nickel chrome, and the braid was made by applying the braid technique which is a Japanese traditional handicraft. As a result, the surface of braid heater has no trace after heat sealing, and the mechanical properties indicated the high peel strength as compared to common metal heater. In addition, the braid heater makes it possible to perform the heat sealing at lower temperature as compared to common metal heater, because of the high adhesion between the heater surface and the surface of gusset bags. Therefore, it was found that the heat sealing properties were improved by using the braid heater for the complicated plastic packages such as gusset bags.
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  • Structure and Properties of Ductile Polypropylene/Polycarbonate Blend
    Koji Matsumoto, Naoto Ichinowatari, Kazuki Obara, Fumihiko Kakuwa, Sho ...
    2014 Volume 26 Issue 2 Pages 93-99
    Published: 2014
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.4325/seikeikakou.26.93
    JOURNAL FREE ACCESS
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    It is well known that melt-blending of polypropylene (PP) with polycarbonate (PC) without a third component has very poor mechanical properties. That is, the tensile properties of PP are seriously weakened by blending the tougher component (PC). We found that, by adding hydrogenated styrene-butadiene-styrene block copolymer (SEBS) as a third component, the mechanical properties were remarkably improved; i.e., the PP/PC/SEBS (especially low molecular weight SEBS) ternary blend, e.g., at 60/40/10 wt. ratio, showed large elongation at break and high Izod impact strength. In the ternary blend, SEBS was dispersed as the fine particles (ca. 100nm diameter) in PP matrix and also as the interface layer between PP matrix and PC particles. FEM analysis showed that the SEBS shell at the interface enhanced the stress concentration in PC core parts, leading to a ductile deformation of the rigid particle (PC) in the ductile matrix (PP).
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