Tensioners and guides help substrates pass through an array of driven and idler rollers, past web treatment, coating and/or slitting stations, and then wound into a master roll. Speed may need to be controlled within a fraction of a percent for precise treatment or coating uniformity. Active tension control is required to maintain traction with the idler rollers and avoid scratches, stretching, tearing, wrinkles and creases. Successful web conveyance requires matching process conditions and machine hardware to the web characteristics.
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