摘要
通过对带铰链瓶盖的注射成型过程进行模拟分析,发现成型瓶盖主体的型腔中的气体未能及时排出,压缩气体阻碍了熔体在瓶盖主体侧壁的填充而在制品上留下凹坑;压缩气体的最高温度为635.9℃,远高于聚丙烯(PP)的分解温度,与气体接触的部分熔体灼烧、分解,造成了瓶盖主体侧壁的部分塑料变色。研究发现,通过增加瓶盖主体底部的壁厚,可以改变熔体的充模流动路径,有效地排出型腔中的气体,消除制品上的气泡,得到合格的制品。
It was found that gas in molding bottle cap body cavity was not discharged immediately by simulating injection process of bottle cap with an integral hinge, and the compressed gas hindered melt filling at the side wall of bottle cap body, so a hole was left. The highest temperature of gas by counting was 635.9℃ , which was much higher than PP decomposition temperature, so part of the melt exposed to the gas was burnt and decomposed, causing part of the plastic of side wall of bottle cap body discolored. Research revealed that increasing wall thickness of the bottom of bottle cap body could change filling route of polymer melt, efficaciously discharge gas in mould cavity, and remove air traps on injection product, so eligible product could be produced.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2009年第3期31-33,共3页
Engineering Plastics Application
