Web201.42b Center-Surface Winder – More Tightness
***201.42b – Center-Surface Winder – More Tightness
04 Slides Duration 02.25 v 15.xx.xx
201.42b.01 – Title Slide
Welcome to Web-Handling. My name is Dave Roisum. In this continuing series on the center-surface winder we explain where and why you can get more tightness with this extra torque difference knob.
201.42b.02 – CS Winder – More Tightness
This extra tightness knob may work well near the core for a few reasons. The first is that it is an extra knob that can be played after the other two, tension and nip, have already been maxed out.
The second reasons are because the nip is not as effective near the core. On soft materials it is because the roll doesn’t feel soft. Instead, it feels the hard core nearby. This precludes much j-line advancement that is the source of tightening on these soft materials. On smooth materials subject to air entrainment the reason is different, but the results are the same. That is the core has truly crappy cylindricity so that air sneaks through the nip through tiny gaps and bumps and other erros so that it softens the roll near the core until a small pad is built up.
Please review modules 20 and 25 of Web101 if any of these concepts are not rock solid.
201.42b.03 – CS Winder – Tightness Limits
The tightening benefit of this third knob runs out of gas pretty quickly for two interrelated reasons. The first is that motors are very expensive and tend to be undersized as a result. The second is related to the centerwind motor. Because it is taking tension AND fighting the surface wind motor and because of the radius increasing torque requirements, it will soon redline. When it does the torque split command can no longer be met.
201.42b.04 – Questions?
Thank you so very much for watching this module in my plant practical video clips. Stay tuned for the tricks and limitations of using the center-surface winder to loosen the wound roll.