Method and apparatus for reducing non-normal incidence distortion in glazing films
AssigneeRO Technologies, LLC
InventorsStephen S. Wilson, Bart E. Wilson
Life of this patent
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Abstract
A method of manufacturing a polymer film includes melting a resin, extruding the melted resin through a die to produce a polymer film, shaping the polymer film, cooling the polymer film, illuminating a surface with a light source, capturing an image of a shadow cast by the polymer film on the surface while the polymer film is between the light source and the surface, calculating a frequency spectrum of at least a portion of the captured image, and adjusting a process parameter of the melting, the extruding, the shaping, or the cooling based on the frequency spectrum.
Claims22
An apparatus for manufacturing a polymer film, the apparatus comprising:
- an extruder assembly for melting a resin and extruding the melted resin through a die to produce a polymer film;
- a roller for shaping and/or cooling the polymer film;
- a light source for illuminating a surface;
- an image sensor configured to capture an image of a shadow cast by the polymer film on the surface while the polymer film is between the light source and the surface;
- and
- a computer configured to calculate a frequency spectrum of at least a portion of the captured image and adjust a process parameter of the extruder assembly or the roller based on the calculated frequency spectrum.
Dependencies are inferred from the claim text.