The gloss defect on a glossy surface is one of the surface defects to be found on injection-molded products. In this paper, the effects of the filling and packing stages on surface gloss are investigated. Based on observations, a generation mechanism of gloss difference is proposed. The difference of the surface gloss can be explained by the replication of the shrinking polymer surface represented by a replication factor. The replication factor is the ratio of melt pressure to surface stiffness, which is influenced by the filling condition and the material properties. The melt pressure as a driving factor to the replication reflects the effect of the flow front speed and viscosity. The surface stiffness as a resisting factor reflects the effect of the flow front speed, mold temperature in the filling stage, and storage modulus. The replication factor shows a high correlation to the surface gloss over a wide range of filling conditions. The proposed mechanism recommends a uniform and high flow front speed and mold temperature to suppress gloss defects.

中文翻译：

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高光泽注塑表面光泽缺陷的产生机理

光泽表面上的光泽缺陷是在注塑产品中发现的表面缺陷之一。在本文中，研究了填充和填充阶段对表面光泽的影响。在此基础上，提出了光泽差的产生机理。表面光泽度的差异可以通过以复制因子表示的收缩聚合物表面的复制来解释。复制因子是熔体压力与表面刚度的比率，该比率受填充条件和材料性能的影响。熔体压力作为复制的驱动因素反映了流动前沿速度和粘度的影响。作为阻力因素的表面刚度反映了流动前沿速度，填充阶段模具温度和储能模量的影响。在广泛的填充条件下，复制因子与表面光泽高度相关。所提出的机制建议采用均匀且高的流动速度和模具温度来抑制光泽缺陷。