The Effect of Post Die Processing Time on Adhesion in Coextrusion Blown and Cast Film, 2010 PLACE Conference

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Peel strength between layers in coextruded cast film is found to increase with increasing post die process time. The results suggest that adhesion is limited by the time and temperature available for bonding after new interfacial area is created during drawing. This contrasts with previous work in blown film where increases in peel strength with process time were attributed primarily to stress effects. The results from both processes, however, were found to collapse onto a single master curve by multiplying the peel strength by the modulus of the tie resin and dividing the process time by the relaxation time of the tie resin.