出版日期：2022-03-20 00:00:00

著者：Guan-Yan Liou; Chi-Wei Su; Po-Wei Huang; Sheng-Jye Hwang*; Chao-Tsai Huang; Hsin-Shu Peng

著錄名稱、卷期、頁數：Polymers 2022 14(6), 1251

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.

關鍵字：long-fiber-reinforced thermoplastic;fiber length;fiber orientation;injection molding;mechanical properties

語言：en

ISSN：2073-4360

期刊性質：國外

收錄於：SCI

通訊作者：Sheng-Jye Hwang

審稿制度：否

國別：CHE

出版型式：電子版