水辅助共注塑弯管壁厚的实验分析

Experimental Study on Residual Thickness of Pipes with Curved Sections Made by Water-assisted Co-injection Molding

利用装配有自主设计的注水装置的共注塑机对水辅助共注塑(WACIM)弯管的壁厚分布进行了实验与分析。结果表明,溢流法WACIM弯管弯曲外侧的总壁厚及内层壁厚都较厚,而弯曲内侧的总壁厚及内层壁厚均较薄;短射法WACIM弯管的总平均壁厚及内层平均壁厚均比溢流法更薄,后段弯曲处外侧的总壁厚及内层壁厚比溢流法显著更薄;随着弯曲角度的增加,弯曲外侧的总壁厚及内层壁厚增加,内侧的总壁厚及内层壁厚减小。

Pipes with curved sections were injection-molded by the water-assisted co-injection molding process （WACIM） on a lab-developed WACIM system, and their wall thickness was analyzed. The results indicated that, at the outer convex side, the total wall thickness and wall thickness of inner layer were much bigger for the curved pipes molded by the overflow WACIM （O- WACIM）, but at the inner convex side, both of them were smaller for the.curved pipes molded by the short-shot WACIM （S-WACIM）. However, the average total wall thickness and the average wall thickness of inner layer for the curved pipes molded by S-WACIM were smaller than those by O-WACIM, and they became much smaller in the curved section of the pipes. At the outer convex side of the pipes, the total wall thickness and the wall thickness of inner layer increased with an increase of bending angle, but at the inner convex side, they tended to decrease.