摘要
在构建表征微尺度下熔体流变特性的黏度模型基础上，通过分析ABS熔体在不同注射温度、不同截面尺寸微流道中的压力分布，对微注射成型过程中聚合物熔体黏度变化对填充过程的影响规律进行了研究。数值模拟结果表明，在微流道中熔体的微尺度黏度小于传统黏度，且随微流道截面特征尺寸的减小而成比例减小；熔体速度分布随微流道截面特征尺寸减小而趋于均匀。
Based on a viscosity model of polymeric melt representing the rheological characteristics in microscale, the influence of melt viscosity on the filling process in micro injection molding was investigated through analyzing the pressure distributions of ABS at different inlet temperatures in different microcharmels. Numerical simulation showed that the microscale viscosity was lower than the conventional one, and reduced with the decreasing characteristic dimension of microchannel section. In addition, the curves of melt velocity at the section of z = 5 mm became more smooth with decreasing characteristic dimension of microchannel section.
出处
《中国塑料》
CAS
CSCD
北大核心
2007年第3期58-62,共5页
China Plastics
基金
国家自然科学基金资助项目（50275020）,“十一五”国家科技支持计划重点项目（2006BAF04B13）
关键词
微注射成型
熔体流动
微尺度黏度模型
数值模拟
micro injection molding
melt flowing
microscale viscosity model
numerical simulation
