Method and apparatus for detecting defects in a moving web
First Claim
1. A method for detecting defects in a moving web, comprising the steps of:
- providing a sensor means near the edge of the moving web for sensing gloss on the surface of the moving web;
providing a signaling means for signaling a web defect;
sensing the web with the sensor means for detecting patches of relatively high gloss on the surface of the web; and
activating the signaling means to signal a web defect upon detection of a patch of relatively high gloss.
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Accused Products
Abstract
A method and apparatus for detecting patches or areas of relatively high gloss on a moving web, and thereby associated wrinkles or other defects, and signalling the presence thereof comprises an analog and/or digital optical reflectivity sensor for sensing gloss on the surface of the moving web, a web marking device adjacent the edge of the moving web for marking the edge of the web with a dye, and a microcomputer for receiving the output signal from the sensor(s) and for controlling the operation of the marking device. The apparatus may also include a warning device such as a light or horn. The apparatus and method have particular applicability in association with paper web re-reeling equipment.
44 Citations
21 Claims
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1. A method for detecting defects in a moving web, comprising the steps of:
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providing a sensor means near the edge of the moving web for sensing gloss on the surface of the moving web; providing a signaling means for signaling a web defect; sensing the web with the sensor means for detecting patches of relatively high gloss on the surface of the web; and activating the signaling means to signal a web defect upon detection of a patch of relatively high gloss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting defects in a moving web on a re-reeler, comprising the steps of
providing a sensor means for sensing gloss on the surface of the moving web; -
positioning the sensor means near the edge of the moving web in the cross-machine direction; providing a marking means adjacent the edge of the moving web for marking the web; providing a microcomputer for receiving the output signal from the sensor means and for controlling the operation of the marking means; sensing gloss level of the moving web with the sensor means; transmitting gloss level data to the microcomputer; determining an occurrence of a gloss patch of at least several inches in length in the machine direction having a gloss level exceeding a predetermined value; and marking the edge of the moving web upon occurrence of gloss patches having a gloss level that exceeds the predetermined value. - View Dependent Claims (13, 14)
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15. An apparatus for detecting defects in a moving web, comprising
sensor means mounted near the edge of the moving web for sensing gloss on the surface of the moving web; -
discerning means responsive to said sensor means for discerning a gloss patch of at least several inches in length in the machine direction and having a gloss level higher than a predetermined value, and for providing an output signal upon discerning a said gloss patch having a gloss level higher than said predetermined value; and signaling means responsive to the output signal of said discerning means for signaling a web defect. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An apparatus for detecting defects in a moving web on a re-reeler having a unwind station and a winder, comprising
an optical reflectivity sensor mounted near the edge of the moving web in the cross-machine direction between the unwind station and the winder for sensing the gloss level of the surface of the edge portion of the web and for providing a gloss level output signal; -
a web edge marker mounted to the winder adjacent the edge of the web; and a microcomputer receptive of the output signal from said sensor and upon the occurrence of a gloss patch of about 6 to 12 inches in length in the machine direction, the patch having a gloss level exceeding a predetermined value, providing an output signal to control the operation of said marking means for marking the edge of the web at the location of the gloss patch.
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Specification