Too much yarn hairiness
- Select traveller with a different shape or different wire cross-section and possibly with higher traveller weight.
- If the speed is too high, the air resistance of the thread balloon increases. The friction on the balloon control ring increases. A reduction of the spindle speed then reduces the hairiness.
- Check the ring, traveller, balloon control ring, thread guide, apron and pressure roller for wear and replace damaged parts.
- Re-centre imbalanced spindles, rings, balloon control rings and thread guides and check the traveller cleaner distance. In the process, check the flatness of the ring rail and ascertain vibration-free movement sequence.
- Check the room climate. A constant adherence to the optimal temperature and air humidity should be ensured. The number of air exchanges must also be sufficient.
- Differences in fibre quality or faulty roving bobbins from insufficient preparation may lead to increased yarn hairiness.
- Consider the influence of yarn tension and draft. Among other things, low yarn tension impairs the incorporation of the fibres
Too many yarn breakages
- The spindle speed is too high. Reduce speed.
- Travellers are wearing too heavily. Select a more favourable traveller design (shape, wire cross-section, weight, surface). Ensure the travellers are clean (fibre laps). Consider the service life of the travellers in order to ensure a timely replacement.
- Rings are worn. With increased service life, the operating behaviour deteriorates so that the yarn breakages also increase. The ring condition should therefore be checked regularly so that a timely replacement occurs.
- Yarn breakages during start-up and unhooking of the thread during doffing. Note the ring rail position when starting. An improvement may be achieved by adjusting the spindle speed, among other things. Other
- Try a different traveller shape.
- Wrap formation in the drafting mechanism. Causes may be the fibre quality, indoor climate, processing conditions, roller covers or cleaning rollers.
- Off-centre position of the spindle, ring, balloon control ring, thread guide. The ring rail is in slanted position or does not move vibration-free.
- Keep the machine clean. Fibre accumulations that suddenly fly off also cause yarn breakages.
- The exhaust system does not work flawlessly or is too weak.
Spindle speed is too low
For maximum spindle speeds, the following conditions must be met:
- The best fibre quality (fibre length, fibre fineness)
- If possible, medium yarn count range and favourable yarn torsion values
- Ring with surface coating and smooth, well run-in running surface without wear
- Ring travellers in optimal design for the processed yarn quality and yarn count (traveller type, wire profile, surface finish, ISO no.)
- Good machine condition through regular maintenance:
- Drafting mechanism with flawless bottom rollers, pressure rollers, bottom apron and roving guides
- Vibration-free movement of the ring rail
- Well-functioning exhaust system
- Vibration-free movement of the spindles, flawless bobbins
- Favourable spinning geometry (spindle gauge, ring diameter, bobbin diameter and length, balloon control ring, thread guide eyelet)
- Correct and good centring of ring, balloon control ring and thread guide eyelet to the spindle, correct setting of the traveller cleaner)
- Keep the entire machine clean with moving fans
- Appropriate room climate (temperature, relative air humidity, number of air exchanges), i.e. a well-functioning air conditioning system
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