Web201.42c Center-Surface Winder – More Looseness
***201.42c – Center-Surface Winder – More Looseness
04 Slides Duration xx.xx v 15.xx.xx
201.42c.01 – Title Slide
Welcome to Web-Handling. My name is Dave Roisum. In this third clip we describe how the center-surface winder can be ‘tricked’ into running super loose, possibly even lower that a pure centerwind might, which is the entire point of this usage.
201.42c.02 – CS Winder – More Looseness
A couple of tricks are needed to get super loose. First, the center-surface winder must be put into gap mode. Second, the center-wind motor is put into tension control as is normal. Third, the surface-wind motor is put into torque control instead of torque differencecontrol. In other words, this surface wind motor is running a setpoint positive torque regardless of what the center wind motor is doing. This drops the tension from the span upstream of the surface wind motor to something less on the span entering the windup.
201.42c.03 – CS Winder - How
So, how is it that we might get looser than a pure centerwinder? It might be because while we are cheating tension lower than might be safe in general, we are doing so only on just one very short span and crossing our fingers that we can get away with it. It also might be that the inevitable and possibly notable tension rise coming from a number of upstream idler roller bearings can be set back down just prior to winding.
201.42c.04 – Questions?
Thank you so very much for watching this module in my plant practical video clips. Stay tuned for the next clip where we describe motor control on this most complicated winder.