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调整芯、壳层熔体的注射温度、速率均可降低夹芯注射成型中芯层熔体冲破趋势。利用Moldflow软件的coinjection模块和正交实验法,分析评价如何调整熔体的注射温度和速率可以最有效地降低芯层熔体冲破趋势。实验发现,芯层熔体冲破趋势对芯/壳层熔体黏度比(R)极敏感,通过减小芯层熔体注射温度、增大壳层熔体注射温度或增大壳层熔体注射速率,均可显著降低芯层熔体冲破趋势,且熔体注射温度的影响更为显著;选取的芯、壳层物料假塑性不同,芯层熔体注射速率对芯层熔体冲破趋势的影响效果不同,甚至相反。
Adjusting the injection temperature and the rate of the core and the shell melt can reduce the tendency of the core layer melt breaking through the sandwich injection molding. Using Moldflow software coinjection module and orthogonal experimental method, it is analyzed and evaluated how to adjust the injection temperature and the velocity of the melt to be the most effective in reducing the tendency of the core melt breaking. The experimental results show that the trend of core melt breakthrough is very sensitive to the core / shell melt viscosity ratio (R). By decreasing the injection temperature of the core melt, increasing the injection temperature of the shell melt or increasing the shell melt injection Velocity can significantly reduce the tendency of the core melt to break through, and the influence of melt injection temperature is more significant. The influence of the core-shell melt injection rate on the melt-break tendency of the core is different for the selected core and shell materials Different effects, or even the opposite.