摘要
阐述了聚合物叶片注塑成型机的结构组成和工作原理,通过叶片塑化单元转子模型及本构方程的表征,分析了该单元聚合物熔体拉伸流动特性和混合性能.结果表明,叶片塑化单元的流场为拉伸与剪切复合流场,混合指数值高达0.945,叶片两边的强拉伸流场区域黏度值较低,具有较强的拉伸作用,可以提高聚合物的塑化混合性能和熔体流动性;叶片单元的混合指数多分布在0.5～0.6之间,而螺杆元件的混合指数多分布在0.4 ～0.5之间,螺杆元件在产生拉伸流场方面远低于叶片单元;动态时叶片塑化单元的拉伸速率比稳态时的大,随着振动强度的增加,该单元拉伸速率和平均拉伸混合效率提高,但是动态时的振动强度不宜过大.因此,采用叶片塑化单元及多物理场耦合开发的叶片注塑成型机优于传统注塑成型机.
Structural composition and working principle of polymer vane injection molding machine were illustrated.Through the expression of rotor model and constitutive equation for vane plasticizing unit,the tensile flow characteristics and blending property of polymer melt in the unit were analyzed.The results showed that flow field of vane plasticizing unit was composed of tensile and shearing complex flow field,the maximum mixing index was 0.945,and viscosity was smaller in the region of vane two sides with strong tensile flow field.The unit was of strong tensile action,and can improve polymer plasticizing and blending property as well as melt flowability.Mixing index of vane unit was distributed mostly between 0.5 and 0.6,while mixing index of screw element was distributed mostly between 0.4 and 0.5,which meant that screw element was lower than vane unit in the aspect of producing tensile flow field.Tensile rate of dynamic state in vane plasticizing unit was larger than that of steady state.With the increasing of vibration strength,tensile rate and average tensile mixing efficiency of the unit improve,but vibration strength at dynamic state should not be too large.Therefore,vane injection molding machine with the couple of vane plasticizing unit and multiphysical field was better than traditional injection molding machine.
出处
《塑料工业》
CAS
CSCD
北大核心
2014年第6期50-54,共5页
China Plastics Industry
基金
广东省自然科学基金资助项目(S2011010000411)
广东高校高分子材料加工工程技术开发中心开放课题资助项目(KF201303)
国家自然科学基金资助项目(11272093)
广东省高等职业院校珠江学者岗位计划资助项目(2012)
关键词
叶片塑化单元
混合性能
混合指数
黏度
拉伸速率
平均拉伸混合效率
Vane Plasticizing Unit
Blending Property
Mixing Index
Viscosity
Tensile Rate
Average Tensile Mixing Efficiency
