Categories: ChemistryMaterials SciencePhysics

Causes of edge beads in cast films

T. Dobroth, Lewis Erwin

DOI: 10.1002/pen.760260704

Journal-article published April 1986 in Polymer Engineering and Science volume 26 issue 7 on page 462-467
© Wiley

Keywords: #tape casting  # extrusion coating  # surface tension  # edge stress effect  Edit keywords

1 0 5.0 Posted: 07.Jan.2019

Surface tension is typical for low viscous suspensions, swell of the flow (die swell) - for elastic suspension, but the edge stress effect is dominated. Analysis of extrusion coating vs casting process. Greater shear or elasticity results in more swelling. calculations of edge quality. A detailed explanation of the mechanism of the appearing swellings at edges. For films made at low speed from low viscosity fluids, surface tension contributes significantly. Edge beads are caused by edge stress

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