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US 2016/0229111 A1Published application
Processes and apparatus for making transversely drawn films with substantially uniaxial character
Assignee3M Innovative Properties Company
InventorsWilliam W. Merrill, Jeffery N. Jackson, Andrew T. Ruff, John A. Wheatley, Dennis L. Krueger
Life of this patent
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Abstract
A roll of multilayer optical film is described. The roll includes a substantially uniaxially-oriented multilayer optical film, where at least one layer of the multilayer optical film has indices of refraction in a length direction and a thickness direction that are substantially the same, but substantially different from an index of refraction in a width direction.
Claims3
A stretcher for processing a film, the stretcher comprising:
- means for receiving a film;
- means for grasping edge portions of the film;
- means for conveying the film in a machine direction;
- and
- means for moving the opposing edge portions along diverging, substantially parabolic paths to form a stretched film.
2 more elements
An apparatus for processing a film, the apparatus comprising:
- conveying means for conveying a film along a machine direction within a stretching region of the apparatus, the conveying means comprising gripping means for holding opposing edge portions of the film, a portion of the conveying means providing diverging curvilinear paths to stretch the film;
- and
- isolated takeaway means for grasping opposing takeaway regions of the film and taking the film from the conveyor directly from the stretching region and conveying the film further along in the machine direction.
Dependencies are inferred from the claim text.