Rieter

Running-in new rings

Index

If worn rings are replaced by new ones, these lack a lubricant film. Purely metal/metal friction therefore prevails for a certain length of time. This is a very critical phase, since the rings can very quickly be damaged by scoring and pick-up. Ring manufacturers have therefore specified precise rules for running- in, adapted to the given type of ring, for the running-in phase during which the surface of the ring has to be smoothed and passivated (oxidized) and coated with a lubricant film.

These can include, for instance:

  • Do not degrease new rings, simply wipe them with a dry cloth.
  • Select the correct ring traveler, but reduce spindle speeds by 15-20% (or normal spindle speeds and ring travelers 1-2 numbers lighter).
  • First traveler change after 15 min.
  • Second traveler change after 30 min.
  • Third traveler change after 1-1 1/2 h.
  • Fourth traveler change after 1st doffing.
  • Traveler change after 2nd + 3rd doffing.
  • Traveler change after 5th + 8th doffing.

Spindle speed can be increased in stages in the meantime. With yarns finer than 7.5 tex (Ne 80) running-in is an even more delicate and protracted procedure. In this case speeds should be reduced by 20-30% and the rings smeared from time to time with oil-soaked felt.