DISTORTIONS OF POLYMER MELT EXTRUDATES AND THEIR ELIMINATION USING SLIPPERY SURFACES

被引:127
作者
PIAU, JM
ELKISSI, N
TOUSSAINT, F
MEZGHANI, A
机构
[1] Université Joseph Fourier Grenoble I, Institut National Polytechnique, de Grenoble
[2] Laboratoire de Rhéologie BP 53, Domaine Universitaire, Grenoble Cedex 9
关键词
POLYMER; EXTRUSION; SHIP; SURFACE ENERGY; DISTORSIONS ELIMINATION;
D O I
10.1007/BF00396053
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
An overview is given of extrudate distortions, flow fields and flow curves observed for flexible polymer melts, when they are extruded using axisymmetric or two-dimensional dies. Die walls with high surface energy and low-energy slippery surfaces are considered, as well as the influence of wall roughness. The connection between flow curves and the flow field structure is explained. Details of the extrudate distortions are given, focusing on the physical phenomena common to all polymer chemical species. A description of the second oscillating flow regime is included. Recent results on ideal and on slippery surfaces are reviewed. An application of slippery surface extrusion to several commercial polyethylenes is presented. It is shown that cracks and flow oscillation distortions can be completely eliminated, and very significant quality and productivity improvements can be obtained using slippery surfaces.
引用
收藏
页码:40 / 57
页数:18
相关论文
共 45 条
[1]  
[Anonymous], 1979, SCALING CONCEPTS POL
[2]   RUBBER-FRICTION VARIATION WITH RATE AND TEMPERATURE - SOME NEW OBSERVATIONS [J].
BARQUINS, M ;
ROBERTS, AD .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1986, 19 (04) :547-563
[3]   CHARACTERIZATION OF THE SHARKSKIN DEFECT AND ITS DEVELOPMENT WITH THE FLOW CONDITIONS [J].
BEAUFILS, P ;
VERGNES, B ;
AGASSANT, JF .
INTERNATIONAL POLYMER PROCESSING, 1989, 4 (02) :78-84
[4]  
BERGEM N, 1976, 7TH P INT C RHEOL GO, P50
[5]  
BOUDREAUX E, 1978, J MACROMOL SCI R M C, VC16, P39
[6]   SHEAR-DEPENDENT SLIPPAGE AT A POLYMER SOLID INTERFACE [J].
BROCHARD, F ;
DEGENNES, PG .
LANGMUIR, 1992, 8 (12) :3033-3037
[7]   ON THE THEORY OF THE ADHESIVE FRICTION OF ELASTOMERS [J].
CHERNYAK, YB ;
LEONOV, AI .
WEAR, 1986, 108 (02) :105-138
[8]   STRETCHING FLOW INSTABILITIES AT EXITS OF EXTRUSION DIES [J].
COGSWELL, FN .
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 1977, 2 (01) :37-47
[9]  
DEGENNES PG, 1979, CR ACAD SCI B PHYS, V289, P265
[10]   ISSUES IN VISCOELASTIC FLUID-MECHANICS [J].
DENN, MM .
ANNUAL REVIEW OF FLUID MECHANICS, 1990, 22 :13-34