| 应力集中效应对熔体挤出流动不稳定性的影响 |
| |
| 引用本文： | 赵贝,王宁,张娜,慕晶霞,吴其晔.应力集中效应对熔体挤出流动不稳定性的影响[J].合成树脂及塑料,2007,24(5):72-76. |
| |
| 作者姓名： | 赵贝 王宁 张娜 慕晶霞 吴其晔 |
| |
| 作者单位： | 青岛科技大学教育部橡塑工程重点实验室,山东青岛,266042 |
| |
| 基金项目： | 国家自然科学基金(50573037，50390090)。 |
| |
| 摘 要： | 用双毛细管流变仪研究了线型低密度聚乙烯、低密度聚乙烯及其共混物在较宽速率范围内的流变行为,通过分析流场中应力集中效应与不稳定流动的关系,从而控制不稳定流动现象。结果表明:挤出物在口模入口处的应力集中占总压力的15%以上时,一般导致毛细管人口压力降的无规振荡及挤出物的整体无规则波动和破裂;整条毛细管上的挤出压力发生振荡,挤出物外观发生光滑段和粗糙段交替出现的有规畸变。
|
| 关 键 词： | 线型低密度聚乙烯 低密度聚乙烯 应力集中 压力振荡 不稳定流动 |
| 文章编号： | 1002-1396（2007）05-0072-05 |
| 修稿时间： | 2007-05-27 |
Relation between stress concentration and unstable flow of melt in extrusion process |
| |
| Zhao Bei,Wang Ning,Zhang Na,Mu Jingxia,Wu Qiye.Relation between stress concentration and unstable flow of melt in extrusion process[J].China Synthetic Resin and Plastics,2007,24(5):72-76. |
| |
| Authors: | Zhao Bei Wang Ning Zhang Na Mu Jingxia Wu Qiye |
| |
| Affiliation: | Key Laboratory of Rubber-plastics Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China |
| |
| Abstract: | This paper studied rheological behaviour of low density polyethylene (LDPE),linear low density polyethylene (LLDPE) and the blends thereof by double-capillary rheometer in a wide flowrate range.The relation between the stress concentration in flow field and instability in flowability of the resin melt was analyzed for the sake of controlling the phenomenon of the unstable flow.The results show that oscillation in pressure drop at inlet of the capillary and the vibration and rupture of the whole extrudate could occur when the stress concentration of the extrudate at entrance of the die accounted for over 15% of the total pressure. In such a case,the extrusion pressure throughout the whole capillary oscillated;smooth and rough surface regions formed alternatively in the appearance of the extrudate |
| |
| Keywords: | linear low density polyethylene low density polyethylene stress concentration pressure oscillation unstable flow |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
