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Analysis of filling distance in cylindrical microfeatures for microinjection molding

机译：显微注射成型圆柱形微特征的填充距离分析

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摘要

In the injection molding of plastic components with cylindrical microfeatures, the ability for the polymer melt to flow into the microchannels is a crucial factor for successful molding. Penetration distance of the polymer melt into the micro-structure depends on several factors as the melt flow rate and the cooling rate in the microfeatures, which depends on the materials and geometric dimensions. In this study, a simplified analytical model was constructed to estimate the filling distance into the cylindrical microchannels. The effects of the mold temperature, injection rate, heat transfer coefficient, and microchannel dimension on the filling distance were investigated. The filling distance decreases dramatically with respect to the decrease of the channel radius. In molding of plastic components with cylindrical microfeatures as those analyzed in this study, decrease of the part thickness could also increase the filling distance in the microfeatures.
机译：在具有圆柱形微特征的塑料部件的注射成型中，聚合物熔体流入微通道的能力是成功成型的关键因素。聚合物熔体进入微结构的渗透距离取决于几个因素，如微特征中的熔体流动速率和冷却速率，这取决于材料和几何尺寸。在这项研究中，构建了简化的分析模型以估计进入圆柱微通道的填充距离。研究了模具温度，注射速率，传热系数和微通道尺寸对填充距离的影响。相对于通道半径的减小，填充距离急剧减小。在本研究中分析的具有圆柱形微特征的塑料部件的成型过程中，减小零件厚度还可以增加微特征的填充距离。

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