WHQuiz Answer #13 - Web Wrinkling vs. Speed

Published: March 19, 2012, By Timothy J. Walker

WebHandlersQuiz 13: Wrinkling - If you see wrinkles at low speeds, but the wrinkles go away at higher speeds, what is the most likely reason? 

Many wrinkle mechanisms are dependent on traction. As speed increases, air lubrication can reduce web-to-roller traction. Without traction there may not be enough force applied to the web from the roller to cause lateral bending (the source of shear wrinkles) or compress the web laterally beyond the buckling criteria.

More on this topic was covered in this archived Web Lines column: 

Optimizing Traction August 2002

If you missed it, here are all 20 questions in my Web Handler's Quiz.