The Use of Deformation Rates in the Scale-Up of Polyethylene Blown Film Extrusion
The Use of Deformation Rates in the Scale-Up of Polyethylene Blown Film Extrusion
复制标题
变形率在聚乙烯吹膜挤出放大中的应用
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
I. R. Harrison
中科院分区：
文献类型：
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作者：
D. M. Simpson;I. R. Harrison
通常期望以最少的时间和金钱花费将过程从实验室规模的系统（大多数研究发生在实验室规模的系统）放大到大规模的工业系统。这项工作将表明，在适当的加工条件下，吹塑薄膜可以在类似的应变下产生相当的结晶形态，因此具有相当的机械性能。示踪技术用于确定吹塑膜形成中的变形，并应用于工业吹塑膜生产线和较小的实验室规模的模拟物。使用计算机增强图像分析，应变和应变率数据从示踪技术获得。比较了大规模和小规模数据的形状和大小的相似性。膜的机械测试表明，单轴和双轴韧性和模量是相似的配对运行基于1/3的比例放大因子的基础上，每个模具圆周的输出。广角X射线分析表明，在平行条件下生产的薄膜之间存在结构或形态相似性。所提供的数据表明，使用适当匹配的加工条件完成了聚乙烯吹塑膜挤出的成功放大。
It is often desirable to scale up a process from a lab scale system, where most research occurs, to a large scale industrial system with minimal ex penses of time and money. This work will show that under appropriate process ing conditions, blown films can be produced under similar strains that yield comparable crystalline morphologies and therefore equivalent mechanical properties. A tracer technique was used to determine deformation in the formation of blown films and applied to both an industrial blown film line and a smaller lab scale analog. Using computer-enhanced image analysis, strain and strain rate data were acquired from the tracer technique. Large and small scale data were compared for similarities in shape and magnitude of respective data plots. Mechanical testing of the films showed that uniaxial and biaxial toughnesses and modulus were similar for paired runs based on a scale-up factor of 1/3 based on output per die circumference. Wide angle X-ray analysis showed struc tural or morphological similarities between films produced under parallel con ditions. The data presented shows that a successful scale-up of polyethylene blown film extrusion was completed using appropriately matched processing condi tions.