Comparative investigations of surface instabilities ("sharkskin") of a linear and a long-chain branched polyethylene [article]

Teodor I. Burghelea, Hans J. Griess, Helmut Muenstedt
2010 arXiv   pre-print
An experimental study of the physical origin and the mechanisms of the sharkskin instability is presented. Extrusion flows through a slit die are studied for two materials: a linear low density polyethylene (LLDPE) and a low density polyethylene (LDPE). By combining laser-Doppler velocimetry (LDV) with rheological measurements in both uniaxial extension and shear, the distributions of tensile and shear stresses in extrusion flows are measured for both materials.
arXiv:1001.2619v1 fatcat:qohv6ccaorbwpjzio3pur3egiu