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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Extruder Elements on Fiber Dimensions and Mechanical Properties of Bast Natural Fiber Polypropylene Composites
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Effect of Extruder Elements on Fiber Dimensions and Mechanical Properties of Bast Natural Fiber Polypropylene Composites

机译：挤出机元素对韧皮天然纤维聚丙烯复合材料纤维尺寸和力学性能的影响

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摘要

Illusions and facts about aspect ratio and the corresponding mechanical properties of the polypropylene flax are studied in this work. Selection of extruder elements controls significantly the fiber final dimensions. Hence, the load transfer efficiency can be improved. Different extruder layouts are tried. First and second trials investigate the mixing degree effect using kneading elements with eight and four kneading elements, respectively. The third and fourth trials keep four kneading blocks but differentiate in using multiprocessing element MPE and toothed elements, respectively. All the four configurations are tested at different shearing rates namely 100, 200, and 300 rpm and different fiber loadings 10, 20, and 30 wt %. Polypropylene (PP) with high flowing properties and slivers flax natural fibers are used. The output extruded strands are mechanically tested. The third and fourth configurations showed superiority to the normal kneading profiles regarding the mechanical properties. Samples of composites are withdrawn after each processing extruder element to study the effect of this element on the fiber dimension. Measurement of extracted fibers is carried out by two methods namely dynamic image analysis machine and secondly normal microscopic investigation. Weibull distributions are defined for fiber geometry distributions for the different locations on the extruder configuration. Also, the effect of the shear rate and the extruder configuration on the final dimensions of the fibers extracted from the composite. The results show the correlation between extruder configuration and fiber aspect ratio and hence the composite overall strength. However, further processing like injection molding erases the pre-extrusion effect.
机译：在这项工作中，研究了有关长宽比和相应的聚丙烯亚麻布机械性能的假象和事实。挤出机元件的选择显着控制了纤维的最终尺寸。因此，可以提高负荷转移效率。尝试了不同的挤出机布局。第一次和第二次试验研究了分别使用八个和四个捏合元件的捏合元件的混合程度效果。第三和第四次试验保留了四个捏合块，但分别使用了多处理元件MPE和齿形元件。所有四种配置均在不同的剪切速率（即100、200和300 rpm）和不同的纤维负载量10、20和30 wt％下进行测试。使用具有高流动性的聚丙烯（PP）和亚麻亚麻天然纤维。输出挤出的线束经过机械测试。就机械性能而言，第三和第四构造显示出优于普通捏合曲线的特征。在每个加工挤出机元件之后取出复合材料样品，以研究该元件对纤维尺寸的影响。提取纤维的测量通过两种方法进行，即动态图像分析仪和第二正常显微镜研究。威布尔分布是为挤出机配置上不同位置的纤维几何分布定义的。同样，剪切速率和挤出机构型对从复合物中提取的纤维的最终尺寸的影响。结果表明，挤出机构型与纤维长径比之间以及相关的复合材料整体强度之间具有相关性。但是，像注射成型这样的进一步处理会消除预挤出效果。

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