WHC Technical Topic: Spreading - Uneven
UNeven spreading may be desirable IF, for example, you wanted to target a specific lane for wrinkle reduction, or IF, for example, you wanted to open up a single slit a bit more. However, only one spreader of the dozen types can do profiled spreading. More commonly, spreading is uneven by some shortcoming in design or maintenance or by webs that are uneven. This can cause slits to overlap and even create wrinkles.
201.22f - https://www.youtube.com/watch?v=wiFdjeaD3aY