Winder Vibration - High Vibration Leads to Roll Throw Out or Slow Winder Operation

Winders are complex machines with many rotating components, with the reel and set continually changing in diameter. With the paper speed accelerating during the start of the set, decelerating at the end of the set and the possibility of speed changes during the set, the paper speed is a critical component to monitor. However, even when the winder is operating at constant speed, the speeds of the reel and set are constantly varying.

To identify the source of the winder vibration, the frequency of the vibration must be related a winder roll speed, the set rotational speed and sometimes to the parent reel rotational speed. The STFT is used for initial analysis and when required advanced transient analysis techniques, such at the time varying discrete Fourier transform (TVDFT) have been implemented by Spectrum Technologies for this analysis.

In some cases, models of potential problems have been developed to determine if the resulting vibration is similar to the measured vibration. This has greatly aided in resolving problems.

Dynamics of winders is a complex problem, and constitutes an area for which there is not a great deal of published literature. Spectrum Technologies has been involved in resolving a number of these problems over the years. Our work has covered many winders, making a variety of grades of paper, hence a range of problems have been encountered and solved.