模具(集成电路)
停留时间分布
十字头
材料科学
停留时间(流体动力学)
住所
聚合物
分布(数学)
流量(数学)
流变学
复合材料
机械
数学
物理
工程类
纳米技术
社会学
岩土工程
数学分析
人口学
抗弯强度
标识
DOI:10.1002/pen.760200308
摘要
Theoretical or rheological calculations for crosshead die geometry were thought not worthwhile until recently, and restrictor, or choker, bars were often excessively relied upon for film uniformity. Thus, the residence time distribution of a polymer melt was infrequently calculated especially in the T-die, because it was assumed to be very wide in T-dies. This report provides a general equation expressing the residence time distribution of polymer melts in T-dies, and indicates how to take an optimum combination of the flow-path dimensions in order to obtain both a high flow uniformity and a comparatively narrow residence time distribution across the die width. Such a T-die designed by the above considerations will produce a shorter heat history and improved physical properties of the sheet or film produced.
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