Fabrication and Property Characterization of Long-Glass-Fiber-Reinforced Polypropylene Composites Processed Using a Three-Barrel Injection Molding Machine

doi:10.3390/polym14061251

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/123277

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Title:	Fabrication and Property Characterization of Long-Glass-Fiber-Reinforced Polypropylene Composites Processed Using a Three-Barrel Injection Molding Machine
Authors:	Liou, Guan-Yan;Su, Chi-Wei;Huang, Po-Wei;Hwang*, Sheng-Jye;Huang, Chao-Tsai;Peng, Hsin-Shu
Keywords:	long-fiber-reinforced thermoplastic;fiber length;fiber orientation;injection molding;mechanical properties
Date:	2022-03-20
Issue Date:	2023-04-28 17:30:38 (UTC+8)
Publisher:	MDPI AG
Abstract:	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.
Relation:	Polymers 2022 14(6), 1251
DOI:	10.3390/polym14061251
Appears in Collections:	[化學工程與材料工程學系暨研究所] 期刊論文

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