Journal of the Japan Society for Composite Materials
Online ISSN : 1884-8559
Print ISSN : 0385-2563
ISSN-L : 0385-2563
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Volume 8, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Kazusuke KOBAYASHI
    1982 Volume 8 Issue 4 Pages 121-128
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.121
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Akira HAMAMOTO
    1982 Volume 8 Issue 4 Pages 128-135
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.128
    JOURNAL FREE ACCESS
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  • Weld Strength of Injection Molded Parts of BMC
    Y. HASEGAWA, S. HANASAKI, J. FUJIWARA, S. TANIGUCHI
    1982 Volume 8 Issue 4 Pages 136-142
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.136
    JOURNAL FREE ACCESS
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    The weld or the weldline is formed, where the flow of molding compound confluents in a cavity. Adhesion at weld is imperfect. Strength of weld is low and is often lower than that of resin. However, the lowering mechanism of weld strength is not well understood yet. Few papers deal with fiber orientation and flow of molding compound in the vicinity of weld, therefore effective method for improvement has not been found. So, in order to clarify the cause of low weld strength, a weld was generated by placing an insert in a cavity and both weld strength and micro structure of weld were investigated. The main results obtained are as follows: Weld strength is very low and this came from the fiber orientation aligning along the weldline. The reacted resin with oxygen in air forms weld, which also lowers the weld strength. The weld strength is improved by preheating of BMC and by exhausting of oxygen in a cavity.
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  • Mechanism of Weld Formation in Injection Molded Parts of BMC
    Y. HASEGAWA, S. HANASAKI, J. FUJIWARA, S. TANIGUCHI
    1982 Volume 8 Issue 4 Pages 143-149
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.143
    JOURNAL FREE ACCESS
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    In injection molding, the weld is formed when the flow of molding compound is injected through multi-gate or is separated by an insert followed by confluent in a cavity. Most studies on weld are concerned with strength, and little work deals with the formation and the hardening mechanism of weld. Then, the mechanism of weld formation was investigated for injection molding of Bulk Molding Compound (BMC). Forming a weld by an insert in a cavity, the behavior of a flow front and the temperature profile in the contact surface of weld were observed. The main results are as follows: The BMC being the first to flow into a cavity forms the weld after being in contact with an insert for a little while, which makes the temperature of flow front high. According, adhesion at weld becomes poor and the strength to be low. During the cross-linking reaction of resin, the reaction between radical and oxygen in air disturbs the normal hardening reaction of resin at the contact surface of weld.
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  • [title in Japanese]
    Isao KIMPARA, Kiyoshi KEMMOCHI
    1982 Volume 8 Issue 4 Pages 150-158
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.150
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1982 Volume 8 Issue 4 Pages 160-162
    Published: October 31, 1982
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.8.160
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1982 Volume 8 Issue 4 Pages 163
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.163
    JOURNAL FREE ACCESS
    Download PDF (210K)
  • [title in Japanese]
    [in Japanese]
    1982 Volume 8 Issue 4 Pages 163a
    Published: October 31, 1982
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.8.163a
    JOURNAL FREE ACCESS
    Download PDF (210K)
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