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US 6,649,216 B2Granted
In-line ultraviolet curable coating process and products produced thereby
AssigneeMitsubishi Polyester Film GmbH
InventorsSteven J. Gust, Patrick M. Smith, Jan C. Westermeier
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Abstract
The present invention relates to a method of coating polymer film that includes the steps of extruding a cast sheet; stretching the sheet in a machine direction; applying a UV-curable coating to the sheet in-line; stretching the sheet in a transverse direction in a tenter; and exposing the coated sheet to UV radiation in-line.
Claims18
A method of coating polymer film that comprises the steps of:
- extruding a cast sheet;
- stretching said sheet in a machine direction;
- applying a UV-curable coating to said sheet in-line;
- stretching said sheet in a transverse direction in a tenter;
- passing said sheet through a crystallizer zone;
- exposing said coated sheet to UV radiation in-line after said crystallizer zone,
- wherein said coating includes a photoinitiator and is applied prior to said crystallizer zone, and
- wherein said photoinitiator is sufficiently heat resistant to survive a crystallizer zone temperature of about 200 to about 300 degrees Celsius in photoinitiating effective amounts.
5 more elements
A method of forming a textured film surface, comprising the steps of:
- forming a biaxially oriented film coated in-line with a UV curable coating, wherein said UV curable coating contains UV curable particles;
- exposing said coating to UV radiation sufficient to cause said particles to adhere to said film, yet extend from said coating as protrusions.
Dependencies are inferred from the claim text.