DEFECT-CONTAINING STRIP AND METHOD FOR DETECTING SUCH DEFECTS
First Claim
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1. A film strip having a longitudinal axis oriented in a winding direction and adapted for cutting into sheets having a length of at least D, comprising:
- at least one defect; and
at least one mark on the film strip corresponding to each defect, wherein each mark is positioned at a distance of at least D from the corresponding defect.
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Accused Products
Abstract
The present invention provides a method for recognizing the presence of at least one defect in a strip of film and identifying its position during film manufacturing; a method for removal of the portion of the film strip containing the defect; and a film strip having at least one defect recognized and its position identified.
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Citations
9 Claims
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1. A film strip having a longitudinal axis oriented in a winding direction and adapted for cutting into sheets having a length of at least D, comprising:
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at least one defect; and at least one mark on the film strip corresponding to each defect, wherein each mark is positioned at a distance of at least D from the corresponding defect. - View Dependent Claims (2, 3, 4, 5)
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6. A method of marking comprising:
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providing a film strip containing at least one defect, the film strip having a longitudinal axis oriented along a winding direction and adapted for cutting into sheets having a length of at least D, detecting the defect; and marking a mark on the strip corresponding to the defect, wherein the mark is positioned at a distance of at least D from the defect. - View Dependent Claims (7, 8)
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9. A method of removing a defect-containing portion of a film strip comprising:
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providing a film strip having a defect and a corresponding mark and having a longitudinal axis oriented along a winding direction and adapted for cutting into sheets having a length of at least D, wherein the corresponding mark is positioned at a distance of at least D from the defect; moving a portion of the film strip containing the corresponding mark past a means for reading marks on the film strip corresponding to each defect, reading the corresponding mark, moving a second portion of the film strip between the defect and the corresponding mark past a means for cutting, first cutting the film strip, moving a third portion of film strip past the means for reading marks, and second cutting the film strip when the means for reading the mark reads no additional marks for a distance of at least D, thereby removing the defect-containing portion from the film strip.
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Specification