脉动压力诱导注射成型充模过程熔体表观黏度的实时测量  

The Real-Time Measurement of Apparent Melt Viscosity during Pulsating-Pressure Induced Plasticating Injection Molding

作　　者：赵学锋[1] 吴宏武[1] 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程研究中心,广东广州510640

出　　处：《塑料》2010年第2期41-44,共4页Plastics

摘　　要：以脉动压力诱导注射成型充模过程浇口流道中熔体壁面表观剪切黏度的数学模型为基础,通过实时测量记录螺杆位置变化以及浇口流道两端熔体压力变化,表征脉动压力诱导注射成型充模过程熔体实时表观剪切黏度的方法,通过实验研究发现,脉动压力的引入使充模过程、熔体的剪切应力和表观剪切黏度降低,同时加剧了熔体的剪切速率变化,在强烈的振动条件下会引起动态充模过程中某些时刻出现断流现象。A mathematical model about the meh apparent shear viscosity during pulsating-pressure induced plasticating injection molding was introduced. On this basis, by measuring and recording changes in melt pressure on both ends of the channel and screw position in real time,a new method for characterization of the real-time melt apparent shear viscosity during pulsating-pressure induced plastieating injection molding was introduced. The results showed that introduction of pulsating- pressure reduced the melt apparent shear viscosity and shear stress on the wall of the channel, and increased the melt shear rate. In conditions of strong vibration, devascularization phenomenon during pulsating-pressure induced plasticating injection molding would be caused.

关 键 词：脉动压力 注射成型 剪切应力 剪切速率 实时表观剪切黏度 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]