By Dr. David R. Roisum  
  
Gage (caliper, density, thickness) bands in a wound roll teach us two things. First is that, for most profile-related defects, you should wind as loose as possible. Second is that winding loose may not be enough, in which case you need to diagnose and reduce the root-cause mechanics of streaky web profile.
 
Web201.68j: 
https://www.youtube.com/watch?v=epv9UpzA3hI​