| 气辅挤出成型中的挤出缩小问题 |
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| 引用本文： | 肖建华,柳和生,黄兴元,徐磊,张晓霞.气辅挤出成型中的挤出缩小问题[J].中国塑料,2008(10). |
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| 作者姓名： | 肖建华 柳和生 黄兴元 徐磊 张晓霞 |
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| 作者单位： | 南昌大学聚合物成型研究室; |
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| 基金项目： | 国家自然科学基金资助项目(20664002和50273012);;2007年度教育部科学技术研究重点项目;;江西省自然科学基金资助项目(0620033);;2006江西省教育厅科技资助项目 |
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| 摘 要： | 对气辅挤出成型过程中存在的挤出物挤出缩小现象进行系统的分析研究。结果表明半固态熔膜现象和熔垂现象是引起气辅挤出物挤出缩小的两个重要原因。口模内的气体温度较低是产生半固态熔膜现象的本质原因,提高气体的温度或减小气辅挤出口模内气室高度可消除半固态熔膜现象;同时指出半固态熔膜的产生与聚合物熔体本身的特性相关,凡是黏度大的,黏度对温度较敏感的聚合物,都容易产生半固态熔膜现象。适当地降低熔体挤出温度可减小熔垂程度。
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| 关 键 词： | 气辅挤出 挤出缩小 半固态熔膜 熔垂 |
Extrudate Contraction of Molten Polymers in Gas-assisted Extrusion |
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| XIAO Jian-hua LIU He-sheng HUANG Xing-yuan XU Lei ZHANG Xiao-xia.Extrudate Contraction of Molten Polymers in Gas-assisted Extrusion[J].China Plastics,2008(10). |
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| Authors: | XIAO Jian-hua LIU He-sheng HUANG Xing-yuan XU Lei ZHANG Xiao-xia |
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| Affiliation: | Polymer Processing Lab;Nanchang University;Nanchang 330031;China |
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| Abstract: | The extrudate contraction of molten polymers in the process of gas-assisted extrusion (GAE) was investigated.Two main reasons were supposed to be responsible for the extrudate contraction:semisolid melting film and melt down.The essential reason for semi-solid melting film was the relatively low temperature of gas in the extrusion die,and it could be eliminated by increasing temperature of gas or decreasing height of the gas chamber in the extrusion die.The semi-solid melting film could also be related to t... |
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| Keywords: | gas-assisted extrusion extrudate reduction semi-solid melting film sagging |
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