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首页> 外文期刊>Journal of Applied Polymer Science >Formation mechanism of high-pressure water penetration induced fiber orientation in overflow water-assisted injection molded short glass fiber-reinforced polypropylene
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Formation mechanism of high-pressure water penetration induced fiber orientation in overflow water-assisted injection molded short glass fiber-reinforced polypropylene

机译：高压水渗透诱导纤维取向在溢流水辅注塑中纤维取向的形成机理 - 增强聚丙烯

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摘要

Recently, there has been growing interest in water-assisted injection molding (WAIM) not only for its advantages over gas-assisted molding (GAIM) and conventional injection molding (CIM), but also for its great potential advantages in industrial applications. To understand the formation mechanism of water penetration induced fiber orientation in overflow water-assisted injection molding (OWAIM) parts of short glass fiber-reinforced polypropylene (SGF/PP), in this work, the external fields and water penetration process within the mold cavity were investigated by experiments and numerical simulations. The results showed that the difference of fiber orientation distribution in thickness direction between WAIM moldings and CIM moldings was mainly ascribed to the great external fields generated by water penetration. Besides, fiber orientation depended on the position both across the part thickness and along the flow direction. Especially in the radial direction, fiber orientation varied considerably. The results also showed that the melt temperature is the principal parameter affecting the fiber orientation along the flow direction, and a higher melt temperature significantly facilitated more fibers to be oriented along the flow direction, which is quite different from the results as previously reported in short-shot water-assisted injection molding (SSWAIM). A higher water pressure, shorter water injection delay time, and higher melt temperature significantly induced more fibers to be orderly oriented in OWAIM moldings, which may improve their mechanical performances and broaden their application scope.
机译：近年来，水辅助注射成型（WAIM）不仅因其优于气体辅助成型（GAIM）和传统注射成型（CIM）的优点，而且因其在工业应用中的巨大潜在优势而受到越来越多的关注。为了了解短玻璃纤维增强聚丙烯（SGF/PP）溢流水辅助注射成型（OWAIM）零件中水渗透诱导纤维取向的形成机理，本工作通过实验和数值模拟研究了模腔内的外场和水渗透过程。结果表明，WAIM模塑件和CIM模塑件在厚度方向上纤维取向分布的差异主要归因于水渗透产生的巨大外场。此外，纤维取向取决于沿零件厚度和流动方向的位置。尤其是在径向，纤维取向变化很大。结果还表明，熔体温度是影响纤维沿流动方向取向的主要参数，较高的熔体温度显著促进更多纤维沿流动方向取向，这与之前在短射水辅助注射成型（SSWAIM）中报道的结果截然不同。较高的水压、较短的注水延迟时间和较高的熔体温度显著地诱导更多的纤维在OWAIM模塑件中有序取向，这可以改善其力学性能并拓宽其应用范围。

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