Methods and devices for processing polymer films
First Claim
Patent Images
1. An apparatus for processing a film, the apparatus comprising:
- a conveyor configured and arranged to convey the film along a machine direction within the apparatus, the conveyor comprising gripping members that are configured and arranged to hold opposing edge portions of the film, and a portion of the conveyor is configured and arranged to provide diverging paths along which the gripping members move to stretch the film; and
an isolated take-away system that receives the film from the conveyor after stretching the film, the take-away system comprising opposing tracks and gripping members configured and arranged to grasp opposing take-away regions of the film after a desired amount of stretching and convey the opposing take-away regions of the film along the opposing tracks, wherein the opposing tracks define a region in which at least a portion of at least one of the opposing tracks is angled with respect to the machine direction.
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Abstract
Stretched polymeric films can be used in a variety of applications, including optical applications. The stretching conditions and shape of the stretching tracks in a stretching apparatus can determine or influence film properties. Take-away systems can be used to receive the film after stretching. The configuration of the take-away system can, in at least some instances, influence final film properties.
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Citations
20 Claims
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1. An apparatus for processing a film, the apparatus comprising:
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a conveyor configured and arranged to convey the film along a machine direction within the apparatus, the conveyor comprising gripping members that are configured and arranged to hold opposing edge portions of the film, and a portion of the conveyor is configured and arranged to provide diverging paths along which the gripping members move to stretch the film; and
an isolated take-away system that receives the film from the conveyor after stretching the film, the take-away system comprising opposing tracks and gripping members configured and arranged to grasp opposing take-away regions of the film after a desired amount of stretching and convey the opposing take-away regions of the film along the opposing tracks, wherein the opposing tracks define a region in which at least a portion of at least one of the opposing tracks is angled with respect to the machine direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for processing a film, the apparatus comprising:
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a conveyor comprising gripping members that hold opposing edge portions of the film and convey, under influence of a drive member, the film along a machine direction within the apparatus, wherein a portion of the conveyor is configured and arranged to provide diverging paths along which the gripping members move to stretch the film; and
an isolated take-away system that receives the film from the conveyor after stretching the film, the take-away system comprising a first set of opposing tracks, a second set of opposing tracks, a plurality of first gripping members configured and arranged to grasp opposing first take-away regions of the film after a desired amount of stretching and convey the film along the first set opposing tracks, and a plurality of second gripping members configured and arranged to grasp opposing second take-away regions of the film and convey the film along the second set of opposing tracks, wherein the second take-away regions are nearer a center of the film than the first take-away regions. - View Dependent Claims (13, 14)
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15. An apparatus for processing a film, the apparatus comprising:
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a conveyor comprising gripping members that hold opposing edge portions of the film and convey, under influence of a drive member, the film along a machine direction within the apparatus, wherein a portion of the conveyor is configured and arranged to provide diverging paths along which the gripping members move to stretch the film; and
an isolated take-away system that receives the film from the conveyor after stretching the film, the take-away system comprising opposing tracks and a plurality of gripping members configured and arranged to grasp opposing take-away regions of the film after a desired amount of stretching and convey the opposing take-away regions of the film along the opposing tracks, wherein the apparatus is configured and arranged to allow selection of a final transverse direction draw ratio of the film by changing a position of the isolated take-away system with respect to a position of the conveyor.
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16. An apparatus for processing a film, the apparatus comprising:
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a conveyor configured and arranged to convey the film along a machine direction, the conveyor comprising gripping members that are configured and arranged to hold opposing edge portions of the film;
a stretching region in which the gripping members are configured and arranged to travel along diverging paths to stretch the film; and
a post-conditioning region disposed after the stretching region and comprising at least one zone in which the gripping members are configured and arranged to travel along converging paths. - View Dependent Claims (17, 18, 19, 20)
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Specification