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Extruded polymeric high transparency films

  • US 20040209057A1
  • Filed: 05/11/2004
  • Published: 10/21/2004
  • Est. Priority Date: 06/07/1995
  • Status: Abandoned Application
First Claim
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1. A process for making a high transparency extruded polymeric film, comprising providing a starting material comprising a solventless and extrudable polymeric material in particulate form essentially free of contaminants having a particle size above about 10 microns;

  • conveying the starting material to a resin dryer, in which the starting material is conveyed to the dryer in a HEPA filtered closed airflow transport line, in which drying air forced through the dryer for drying said starting material is treated in a separate air dryer for removing moisture from the drying air, and in which the drying air is subjected to HEPA filtration for removing airborne contaminants greater than about 10 microns in size from the drying air;

    conveying the dried extrudable polymeric starting material in a HEPA filtered closed air flow transport line from the resin dryer to an extruder; and

    extruding the dried starting material as a highly transparent polymeric film essentially free of defects caused by said filtered airborne contaminants.

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