Abstract
Abstract The extrusion of present-day linear low-density polyethylenes (LLDPEs) and highdensity polyethylenes (HDPEs) is frequently accompanied by processinginduced defects, such as sharkskin surfaces, cyclic and continuous melt fracture, and draw resonance. Sharkskin surfaces are evident particularly in tubular film extrusion, where the surface of the product may be marred by herringbone or chevron-type irregularities. Draw resonance is observed primarily in highs-speed extrusions of tape or fiber, or in extrusion mating which involves stretching of a flowing melt. In this case the dimensions of the extrudate change in a regular, pulsating manner.
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