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
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency greater than 2 cycles per millimeter, wherein the polymer film is a multi-layer film, wherein the multi-layer film comprises an adhesive, wherein the adhesive comprises a pressure sensitive adhesive (PSA).
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency greater than 2 cycles per millimeter, wherein the polymer film comprises biaxially-oriented polyethylene terephthalate.
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency outside of 0.5-2 cycles per millimeter, wherein the polymer film is a multi-layer film, wherein the multi-layer film comprises an adhesive, wherein the adhesive comprises a pressure sensitive adhesive (PSA).
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency outside of 0.5-2 cycles per millimeter, wherein the polymer film comprises biaxially-oriented polyethylene terephthalate.
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency between 2 and 6 cycles per millimeter, wherein the polymer film is a multi-layer film, wherein the multi-layer film comprises an adhesive, wherein the adhesive comprises a pressure sensitive adhesive (PSA).
A polymer film having a density variation such that a maximum value of a frequency spectrum calculated from grayscale image data of a transverse cross-section of a shadow cast by the polymer film at 60 degrees angle of incidence with respect to a light source is at a spatial frequency between 2 and 6 cycles per millimeter, wherein the polymer film comprises biaxially-oriented polyethylene terephthalate.
Dependencies are inferred from the claim text.