OSCILLATING FLOW IN CAPILLARY DIES FOR A HDPE MELT: EFFECTS OF EXTRUSION PARAMETERS

被引：2
|
作者：
Baldi, F. [1 ]
Franceschini, A. [1 ]
Briatico-Vangosa, F. [2 ]
Locati, G. [1 ]
Ricco, T. [1 ]
机构：
[1] Univ Brescia, Dipartimento Ingn Meccan & Ind, I-25121 Brescia, Italy
[2] Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, Milan, Italy
来源：
INTERNATIONAL JOURNAL OF MATERIAL FORMING | 2010年 / 3卷
关键词：
extrusion; melt fracture; oscillating flow; high-density polyethylene (HDPE); SLIP;
D O I：
10.1007/s12289-010-0827-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The study of the instability phenomena of polymer melts in capillary flows is of great technical relevance since, during an industrial die forming operation, these instabilities can give origin to a transition from a defect-free to a highly-defective extrudate. In this work, the instability phenomena exhibited in capillary flow by a blow moulding grade of high-density polyethylene (HDPE) were analyzed. In particular, by means of a capillary rheometer, which mimics polymer extrusion, the effects of specific extrusion parameters (temperature and imposed flow rate) on the oscillating flow, that takes place when "stick-slip" instabilities occur, were investigated.
引用
收藏
页码：543 / 546
页数：4
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