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首页> 外文期刊>Journal of Applied Polymer Science >Effects of molding conditions on the electromagnetic interference performance of conductive ABS parts
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Effects of molding conditions on the electromagnetic interference performance of conductive ABS parts

机译：成型条件对导电ABS零件电磁干扰性能的影响

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摘要

Polymers filled with conducting fibers to prevent electromagnetic interference (EMI) performance have recently received great attention due to the requirements of 3C (computer, communication, and consumer electronics) products. In the present article, the effect of fiber content and processing parameters, including melt temperature, mold temperature, and injection velocity, on the electromagnetic interference shielding effectiveness (SE) in injection molded ABS polymer composites filled with conductive stainless steel fiber (SSF) was investigated. The influence of fiber orientation and distribution resulting from fiber content and molding conditions on EMI performance was also examined. It was found from measured results that fiber content plays a significant role in influencing part EMI SE performance. SE value can reach the highest values of approximately 40 dB and 60 dB at 1000 MHz frequency for fiber content 7 wt % and 14 wt %, respectively, under the best choice of molding conditions. Higher melt and mold temperature would increase shielding effectiveness due to a more uniform and random fiber orientation. However, higher injection velocity leading to highly-orientated and less uniform distribution of fiber reduces shielding effectiveness. Among all molding parameters, melt temperature affects SE performance most significantly. Its influence slightly decreases as fiber content increases. Injection speed plays a secondary importance in affecting SE values, and its influence increases as fiber content increases. Upon examination of fiber distribution via optical microscope and subsequent image analysis, it was found that the fiber becomes more densely and random distributed toward the last melt-filled region, whereas fiber exhibits less concentration around the middle way of the flow path. This can be attributed to the combined effects of fountain flow, frozen layer thickness, and gapwise melt front velocity. The results indicate that molding conditions, instead of fiber content alone, are very important on the SE performance for injection molded SSF filled ABS composites. (c) 2005 Wiley Periodicals, Inc.
机译：由于3C（计算机，通信和消费电子产品）的要求，填充有导电纤维以防止电磁干扰（EMI）性能的聚合物近来受到了广泛的关注。在本文中，纤维含量和加工参数（包括熔体温度，模具温度和注射速度）对填充导电不锈钢纤维（SSF）的注塑ABS聚合物复合材料的电磁干扰屏蔽效果（SE）的影响是调查。还检查了由纤维含量和成型条件引起的纤维取向和分布对EMI性能的影响。从测量结果发现，纤维含量在影响部分EMI SE性能中起着重要作用。在最佳选择成型条件下，当纤维含量分别为7 wt％和14 wt％时，SE值在1000 MHz频率下可以分别达到约40 dB和60 dB的最大值。更高的熔体和模具温度将由于更均匀和随机的纤维取向而提高屏蔽效果。然而，较高的注射速度导致纤维的高度取向和较不均匀的分布降低了屏蔽效果。在所有成型参数中，熔体温度对SE性能的影响最大。随着纤维含量的增加，其影响会稍有降低。注射速度在影响SE值中具有次要的重要性，并且随着纤维含量的增加，其影响也随之增加。通过光学显微镜检查纤维分布并进行随后的图像分析后，发现纤维向最后的熔融填充区域变得更致密且无规分布，而纤维在流路的中部周围表现出较低的浓度。这可以归因于润版液流量，冻结层厚度和间隙熔体前沿速度的综合影响。结果表明，成型条件，而不是单独的纤维含量，对于注模成型的SSF填充ABS复合材料的SE性能非常重要。 （c）2005年Wiley Periodicals，Inc.

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