Traveller Wear and Change Frequency
topic
Travellers wear by abrasion against the ring flange, generating heat (traveller temperature 300–400°C at 20,000 RPM) that softens the traveller and causes dimensional change. Wear manifests as groove formation on the contact face, increasing friction and yarn tension. Traveller change intervals range from 8 hours (for fine counts at high speed) to 100+ hours (coarse counts, low speed). Worn travellers cause traveller fly-off — sudden detachment causing end breakage and potential ring damage.
Role
Traveller change scheduling is a fundamental maintenance engineering activity that directly controls end-breakage rate. Under-changing (worn travellers) increases breakages by 30–50% in the final hours before change; over-changing wastes travellers and risks breakages during the critical run-in period (first 30 minutes after change when the new traveller beds into the ring). Optimal scheduling is the highest-ROI maintenance decision in ring spinning.