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An experimental study of the physical origin and the mechanisms of thesharkskin instability is presented. Extrusion flows through a slit die arestudied for two materials: a linear low density polyethylene (LLDPE) and a lowdensity polyethylene (LDPE). By combining laser-Doppler velocimetry (LDV) withrheological measurements in both uniaxial extension and shear, thedistributions of tensile and shear stresses in extrusion flows are measured forboth materials.

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