Nireco Web Guiding Systems
Controlled alignment is absolutely essential in providing a quality roll, and reducing scrap and waste. Nireco Web Guiding systems provide better alignment for the enhance quality that the customer demands. Web guiding is the technique of correctly aligning a continuous strip of material with the process to be performed upon it. The strip of material or web can be paper, plastic, paperboard, rubber, metal, textile, non-woven, or any other product that is normally processed in a continuous strip. As these materials are unwound and fed into a machine, they must be properly aligned with the process to be performed on them.
There are three basic techniques of web guiding
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Unwind Guiding - This technique is performed by sensing the web as it enters the machine. The sensor is mounted as part of the main machine frame
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Roll Steering Guiding - This method of web guiding is normally used in mid-process for minor corrections as a web passes through several processes within a machine
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Wind-Up Roll Stand Guiding - This technique is the reverse of unwind stand web guiding. In wind up stand guiding, the web position is sensed by a sensor mounted as part of the moveable wind-up roll stand.
There are three control positions
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Edge Position Control - With EPC one edge of the material is aligned with the process at all times. The guided edge remains constant throughout app processes.
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Centre Position Control - CPC requires two sensors, one places on either side of the web. With CPC the object is to maintain the center of the web on the mean centre line of the machine.
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Line Follower Control - LFC, employed for previously processed webs, uses a sensor to follow a line previously printed on a web: or the edge of a pattern of print or a coating material previously laid down on the web.
Several types of sensors are used to detect a web's position. The type required for any web guiding system is determined by the method required (EPC, CPC or LFC) and type of material to be sensed. There are four types of sensors:
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Pneumatic Sensor
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Incandescent Sensor
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Infa-red Sensor
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Line Following Sensor
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