Web201.42a Center-Surface Winder – What/Why
***201.42a – Center-Surface Winder – What/Why
04 Slides Duration 03.22 v 15.xx.xx
201.42a.01 – Title Slide
Welcome to Web-Handling. My name is Dave Roisum. The center-surface winder is easily the most expensive and most complicated winder type. This first in a series of clips explains what it is and why you might want it. The last of these clips explains why you might not want it. So, stay tuned to avoid a Type 1 error of assuming this winder is helpful when it might not be. Stay tuned to avoid a Type 2 error of assuming this winder might not be helpful when it could be.
201.42a.02 – Center-Surface Winder - What
As we learned in Web101, a center winder has a motor attached to the core of a wound roll. Also as we learned in Web101, a surface winder has a motor attached to the layon roller. Thus, a center-surface winder has two motors, one attached to the roll and another to the roller. Recall from Web101 that the motor, in this case the sum of two motors minus drag, makes tension and that thedifference between these two motors makes the center-surface winding torque differential knob.
201.42a.03 – Center-Surface Winder - Why
So why would we want all these motors with accompanying expense and complication? The short answer is to possibly extend the range of tightness that would otherwise be available with the other knobs because they are already redlined. The range might be extended at the tight end, but only for a limited set of circumstances as described in the next clip. The range might be extended at the loose end as described in Web201.42c, but only by employing a certain trick that has some really severe application limitations.
So the big question that must be asked now and that we answered in Web101 in great detail is this. Will extending the range of tightness uniquely help you with your particular defects. If the defects are not tightness sensitive, then you need not proceed further. If the tightness value can be achieved with your first two knobs, tension and nip, then you need not proceed further. If the tightness range extension is does not work for the diameter you need, then you need not proceed further. If the cost of the equipment exceeds the cost of the defects that can be recovered with this knob, then you need not proceed further.
201.42a.04 – Questions?
Thank you so very much for watching this module in my plant practical video clips. Stay tuned for more detailed description of the center-surface winder.