摘要
为克服超薄注塑充模的困难,定义了主、次相剪切的概念,分析了超薄注塑剪切场.根据泊肃叶方程,通过狭缝流变实验,重点讨论了超薄注塑过程中次相剪切对表观黏度、表观剪应力的影响,分析了次相剪切与粘性升温、入口压力的关系,发现次相剪切能有效改善超薄注塑中的熔体充模.文中还提出了超薄导光板的表面微特征混排设计方法,使熔体在流动平面内形成次相剪切,有效提高了制件填充率,验证了次相剪切效应的理论正确性.
In order to overcome the difficulties existing in ultra-thin injection molding, the concepts of primary-phase and secondary-phase shears are defined, and the shear field of ultra-thin injection molding is analyzed. Then, based on the Poiseuille equation, the effects of the secondary-phase shear on the apparent viscosity and the apparent shear stress in the ultra-thin injection molding process are discussed in detail through slit rheological ex- periments, and the relationship between the secondary-phase shear and the viscous heating on the one hand and the gate pressure on the other is analyzed, finding that the secondary-phase shear effectively improves the melt filling during the ultra-thin injection molding. Moreover, a mixed network method is presented for the design of ultra-thin light guide plates, which helps to form secondary-phase shear in the melt-flowing plane and effectively improves the filling rate of products. The theoretical correctness of the secondary-phase shear effect is finally verified by experiments.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期58-63,85,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省建设现代化产业体系技术创新滚动计划项目(2009863024)
粤港关键领域重点突破项目(2009205200001)
关键词
超薄注塑
次相剪切
流变实验
导光板
ultra-thin injection molding
secondary-phase shear
rheological experiment
light guide plate
