Tips

 


Home >>> Tech Tip

Why do I have web wrinkles?


You may ask yourself this question many times. Especially if you never had web wrinkles in the past and now you do. There are many reasons why webs wrinkle and I would recommend reading the white paper entitled Web Spreading for more information.

Here are some of the most common causes of web wrinkles:

  • Gauge band variations: web thickness variations measured across the web.
  • Linear variations: web length variations measured in machine direction.
  • Poorly wound roll stock: incorrect winding tension to produce your stock roll at your unwind.
  • Roller deflection: rollers in your machine bending under web tension.
  • Air entrainment: webs loosing traction with rollers due to high running speeds.
  • Parent rolls deflecting: heavy rolls bending on their supports.
  • Tension variations: web tension changes in your process.
  • Skewed rollers: probably the main cause of web wrinkles.

There are many causes for web wrinkles and yours may be one or many combinations of the causes listed above.

In order to combat wrinkles it is important to have an understanding of why the wrinkles are occurring in your process. As a starting point, try pin-pointing one or more reasons why your web wrinkles. From there you will be able to discover ways to eliminate your wrinkle problems.


**DISCLAIMER - A great deal of time has been invested in the development of our weekly tech tips. To the best of our knowledge, they are accurate. It is up to the user to verify all results.

THE AUTHOR ASSUMES NO LIABILITY CONNECTED WITH THE USE OF THIS INFORMATION OR THE RESULTS OBTAINED FROM IT.