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US 6,638,583 B1Granted
Method and apparatus for laminating stacks of polycarbonate films
AssigneeColorLink, Inc.
InventorsGary D. Sharp, Warren D. Slafer
Life of this patent
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Abstract
A film welding apparatus is provided for solvent welding a first film to a second film. The apparatus has a movable backing surface adapted to support the first film, a pressing roller adapted to press the second film against the first film, and a solvent dispenser adapted to dispense a solvent between the first and second films.
Claims52
A welded film stack comprising:
- a first film having a first molecular orientation;
- and
- a second film welded to the first film, wherein the second film welded to the first film has a second molecular orientation different from the first molecular orientation.
A solvent welded retarder stack comprising:
- a plurality of polycarbonate retarder films,
- wherein solvent welding bonds at least two of the plurality of polycarbonate films using a low temperature process.
A stack according to 11, wherein at least one of the first film and the second film has been stretched to impose its respective molecular orientation upon it.
Dependencies are inferred from the claim text.