Process for calendering of polymeric vinyl films exhibiting high gloss and structural stability
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United States of America Patent
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Issued Date -
Jul 10, 2003
app pub date -
Feb 14, 2003
filing date -
Aug 9, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and apparatus for calendering polymeric vinyl films exhibiting high gloss and structural stability. Specifically, the invention presents a method and apparatus for calendering polyvinyl chloride film of such a nature. In accordance with the invention, a casting sheet is interposed within the calendering head wherein a blend of polyvinyl chloride resin is formed, in standard fashion, into a continuous film web. In accordance with one embodiment of the invention, the casting sheet, preferably of heat resistant polyester film, is introduced into a nip between existent processing rolls near the end of the processing head. Alternatively, a separate nip may be provided by the addition of a separate roll in juxtaposition to a final roll in the calendering head. In either instance, the casting sheet is forcefully applied to the polyvinyl chloride film prior to engagement with the embossing rolls of the manufacturing process.
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