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

页码：543 / 546

页数：4

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