淡江大學機構典藏:Item 987654321/123277
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    題名: Fabrication and Property Characterization of Long-Glass-Fiber-Reinforced Polypropylene Composites Processed Using a Three-Barrel Injection Molding Machine
    作者: Liou, Guan-Yan;Su, Chi-Wei;Huang, Po-Wei;Hwang*, Sheng-Jye;Huang, Chao-Tsai;Peng, Hsin-Shu
    關鍵詞: long-fiber-reinforced thermoplastic;fiber length;fiber orientation;injection molding;mechanical properties
    日期: 2022-03-20
    上傳時間: 2023-04-28 17:30:38 (UTC+8)
    出版者: MDPI AG
    摘要: Processing equipment and parameters will highly influence the properties of long-fiberreinforced
    injection-molded thermoplastic composites, leading to different fiber lengths and orientations.
    Thus, maintaining fiber length during the injection molding process is always a big challenge
    for engineers. This study uses long-glass-fiber-reinforced polypropylene with 25 mm fiber length
    and a special-built novel injection molding machine with a three-barrel injection unit, including a
    plasticizing screw, an injection plunger, and a packing plunger, to fabricate injection molding parts
    while retaining long fiber length. This study also discusses the influence of process parameters,
    such as back pressure, screw speed, melt temperature, and different flow paths, on the properties of
    long-glass-fiber-reinforced composites. The experiment results show that a higher screw speed and
    back pressure will reduce the fiber length in the injection-molded parts. However, using appropriate
    parameter settings can maintain the fiber length to more than 10 mm. It was found that by increasing
    the back pressure, the cross direction of the fiber orientation can be increased by up to 15% and the
    air trap volume fraction can be decreased by up to 86%. Setting appropriate back pressure under a
    low screw speed will increase the tensile strength. Finally, it was found that the single-edge-gate path
    results in a higher tensile strength than that of the single-sprue-gate path due to the retainment of
    longer fiber length in the injection-molded part.
    關聯: Polymers 2022 14(6), 1251
    DOI: 10.3390/polym14061251
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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