water penetration length and fiber orientation (along the melt flow direction) are important indicators for water‐assisted injection molding products of the fiber‐reinforced polymer. The effects of melt short shot size, water injection delay time and water injection pressure on these two important indexes are analyzed theoretically and experimentally. The study found that with the increase of the melt short shot size, the extension of the water injection delay time and the increase of the water injection pressure, the water penetration length changed from 216 to 96 mm, 170 to 210 mm, and 215 to 180 mm, respectively. Therefore, it can be known that melt short shot size has the greatest influence on water penetration length, followed by water injection delay time, and finally water injection pressure. Meantime, due to the fiber orientation and change degree of water‐assisted injection‐molded products along the melt flow direction, the fiber orientation in the water channel layer along the melt flow direction has the highest and lowest change degree, followed by the wall layer and finally the core layer. It can be known that the melt short shot size has the greatest influence on the fiber orientation and the degree of change along the melt flow direction, followed by the water injection delay time, and finally the water injection pressure.

中文翻译：

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短玻璃纤维增​​强聚丙烯的短时水助注射成型研究

透水长度和纤维取向（沿熔体流动方向）是纤维增强聚合物水辅助注塑产品的重要指标。从理论上和实验上分析了熔体短射尺寸，注水延迟时间和注水压力对这两个重要指标的影响。研究发现，随着熔体短射尺寸的增加，注水延迟时间的延长和注水压力的增加，注水长度从216变为96 mm，从170变为210 mm，从215变为215 mm。 180毫米 因此，可以知道熔体短射尺寸对水渗透长度的影响最大，其次是注水延迟时间，最后是注水压力。与此同时，由于水辅助注塑产品沿熔体流动方向的纤维取向和变化程度，水通道层沿熔体流动方向的纤维取向变化程度最高和最低，其次是壁层，最后是核心层。可以知道，熔体短射尺寸对纤维取向和沿熔体流动方向的变化程度的影响最大，其次是注水延迟时间，最后是注水压力。