METHOD OF MAKING A THERMOPLASTIC FILM WITH A THREE-DIMENSIONALLY STRUCTURED SURFACE
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United States of America Patent
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Issued Date -
Aug 4, 2011
app pub date -
Apr 21, 2010
filing date -
Apr 22, 2009
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Abandoned
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Abstract
A thermoplastic film with a three-dimensionally structured outer surface is made by coextruding through a slit nozzle a multilayer molten plastic film having an outer layer formed of a thermoplastic polyurethane elastomer with an isocyanate additive and an inner layer. This multilayer film is compressed in a nip between a roll and a belt to emboss a three-dimensional structure into the outer layer. The roll is cooled to cool the film and set the three-dimensional structure in the outer surface of the outer layer.
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