Defect locating system for moving web
First Claim
1. A method of detecting and removing blemishes from a web of material, comprising:
- advancing a web along a first processing path, as the web advances along the first processing path, marking the web with length marks that indicate lengths along the web, as the web advances along the first processing path detecting blemishes in the web, in response to the detection of each blemish in the web, recording the length mark adjacent each blemish along the length of the web, and accumulating the web in a spiral wound roll, un-reeling the roll and advancing the web from the roll along a second processing path, as the roll advances along the second processing path, detecting the length marks on the web, and in response to the detection of a length mark on the web at the location of a blemish, treating the blemish.
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Abstract
Included in this disclosure are methods for locating defects on a web material. The methods include searching a web for defects and creating a roll defect map. Searching for web defects may take the form of any of a plurality of procedures including using a vision defect sensor and/or a gauging defect sensor. Also included in the methods are marking the web at intervals along the length of the web, wherein the web markings are readable by a sensor. The methods also include forming the web into a spiral wound roll and communicating the roll defect map to a defect locator. The methods also synchronize the web markings with the roll defect map; and automatically locates at least one defect on the web.
52 Citations
26 Claims
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1. A method of detecting and removing blemishes from a web of material, comprising:
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advancing a web along a first processing path, as the web advances along the first processing path, marking the web with length marks that indicate lengths along the web, as the web advances along the first processing path detecting blemishes in the web, in response to the detection of each blemish in the web, recording the length mark adjacent each blemish along the length of the web, and accumulating the web in a spiral wound roll, un-reeling the roll and advancing the web from the roll along a second processing path, as the roll advances along the second processing path, detecting the length marks on the web, and in response to the detection of a length mark on the web at the location of a blemish, treating the blemish. - View Dependent Claims (2, 3, 4)
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5. A web having a width and an undetermined length, computer readable length marks applied to the web at intervals along the length of the web,
blemishes at random intervals along the length of the web, and the web formed into a spiral wound roll.
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10. A method for locating defects on an elongated web, comprising:
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advancing the web along its length;
as the web is advanced, searching the web for defects;
marking the web at intervals along the length of the web with at least one indicator mark, wherein the at least one indicator mark is readable by a sensor and comprises at least one piece of encoded data;
forming the web into a spiral wound roll;
decoding data from the at least one indicator mark;
automatically locating at least one defect on the web based on the data decoded from the at least one indicator mark. - View Dependent Claims (11, 12, 14, 15, 16, 17, 18)
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13. The method of clam 10, further comprising:
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dividing the spiral wound roll into a plurality of special purpose rolls;
wherein marking the web with at least one indicator mark comprises marking the web at a position spaced across the width of the web that corresponds to the position where spiral wound roll is separated into a plurality of special purpose rolls.
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19. A system for locating defects on a web, comprising:
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a web having an undetermined length;
at least one defect on the web;
logic configured to detect defects on the web;
means for inserting at least one indicator mark on the web, the at least one indicator mark being readable by a sensor and comprises at least one piece of encoded data;
logic configured to decode data from the at least one indicator mark; and
logic configured to locate a defect on the web using the data decoded from the at least one indicator mark. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification