Rieter

The balloon checking ring (BER) (antiballooning device)

Index

Relatively high spindles are generally used nowadays. The distance between the ring and the thread guide eyelet, and therefore the balloon, is therefore correspondingly large, especially during winding on the bottom end of the tube. When dragging the  ring traveler with it, the yarn in the balloon therefore assumes a distinctly curved shape. The balloon becomes unstable and may collapse. In order to prevent this „necking“ (transition from a single to a multiple balloon), the balloon is restricted in the middle by the balloon checking ring in such a way that two smaller balloons are formed which are in themselves stable. Balloon checking rings permit operation at higher speeds, but can result in:

  • napping of the thread,
  • severe fiber abrasion (formation of fly) and
  • formation of melt points on manmade fibers

as the thread rubs against them.

Close attention must be paid to the last of these. In the same way as the thread guides, the balloon checking rings also perform the traversing motions of the ring rail in smaller amounts.

Fig. 27 – Balloon checking ring