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

共 7 条

[1] [Anonymous], 3809 BIRCHW DRIV
[2] Bergem N, 1976, P 7 INT C RHEOL GOTH, P50
[3] Briatico-Vangosa F., 2002, THESIS POLITECNICO M
[4] Experimental study and modeling of oscillating flow of high density polyethylenes
Durand, V
Vergnes, B
Agassant, JF
Benoit, E
Koopmans, RJ
[J]. JOURNAL OF RHEOLOGY, 1996, 40 (03) : 383 - 394
[5] ROLE OF SLIP AND FRACTURE IN THE OSCILLATING FLOW OF HDPE IN A CAPILLARY
HATZIKIRIAKOS, SG
DEALY, JM
[J]. JOURNAL OF RHEOLOGY, 1992, 36 (05) : 845 - 884
[6] WALL SLIP AND EXTRUDATE DISTORTION IN LINEAR LOW-DENSITY POLYETHYLENE
KALIKA, DS
DENN, MM
[J]. JOURNAL OF RHEOLOGY, 1987, 31 (08) : 815 - 834
[7] MODELING POLYMER MELT-FLOW INSTABILITIES
MOLENAAR, J
KOOPMANS, RJ
[J]. JOURNAL OF RHEOLOGY, 1994, 38 (01) : 99 - 109

← 1 →