CVm% 14.8% — Uster 25th percentile says 12.8%.
₹4.96Cr/year in missed premium. Noil 18.6% vs 14.2% target.

OpsOracle AI Output

Your CVm% 14.8% on 30s Ne carded at a 5-year-old Truetzschler TC-11 is explained by three simultaneous factors. (1) Card clothing age — at 5 years of 50 kg/hr production per card, each card has processed approximately 65,000 tonnes of cotton per tooth (extrapolated). TC-11 flat clothing typically degrades after 3–4 years at this production rate. Worn flat clothing fails to efficiently remove short fibres (< 12mm) and opens nep clusters — the result is the high nep count of 180/km (35% above 25th percentile benchmark of 145/km) and the excess thick places. (2) Ring traveller at 28 days is approaching the end of its life for LRK traveller on 30s Ne. Worn travellers (> 21–25 days on 30s) cause irregular balloon geometry and yarn tension variation, which directly contributes to CVm% via mechanical tension irregularity in the twisting zone. (3) Spinning room humidity at 62% vs the ideal 65% for cotton: at 62%, cotton fibres are less plasticized, inter-fibre friction is higher and more erratic, and drafting zone fibre control is less uniform — this alone contributes 0.4–0.6% to CVm%.

OpsOracle AI Output

Your break pattern — worse in the afternoon/evening shift — immediately identifies humidity as a primary factor. Relative humidity drop from 62% (day) to 58–60% (evening) in the spinning room directly increases fibre-to-fibre friction variability in the drafting zone, creating irregular yarn and more thin places that break under balloon tension. The 38% of breaks in the yarn path (not drafting zone) additionally indicates ring or traveller wear rather than a drafting problem. Three causes: (1) Evening humidity drop to 58–60% — at this level, cotton fibres are insufficiently conditioned, static build-up on the roving is higher, and fly accumulation on aprons and top rollers is worse. Thin places formed in the drafting zone due to poor fibre control break at the traveller. (2) 5-year-old rings — a ring that's 5 years old at 18,000 RPM may have worn the running surface groove to the point of traveller instability. A worn ring track causes the traveller to oscillate rather than run smoothly, creating periodic tension spikes that snap the yarn. (3) 34% of breaks at top roller indicates top roller rubber worn or hardened — a hardened top roller has reduced bite, allowing fibre slippage in the drafting zone, creating thick-thin variation.

OpsOracle AI Output

Your 4.4% noil excess is explained by a combination of three simultaneous changes that all pushed in the same direction. (1) Speed increase from 380 to 400 nips/min: the detachment ratio at 400 nips/min with a 5.6mm feed length is slightly higher than at 380 nips/min for the same detachment distance. At higher speed, the circular comb has less time per nip to engage fibres optimally — short fibres that were being retained at 380 nips/min are now being detached with the noil. This speed effect alone typically adds 1.5–2.5% noil. (2) Cotton UHML drop from 30.2mm to 29.0mm: combing is designed around the cotton length. When UHML drops by 1.2mm, fibres that were above the detachment distance are now partially below it — they fall into the noil. The detachment distance of 12mm was set for 30.2mm cotton; for 29.0mm cotton, 11.2–11.5mm would be optimal. (3) Circular comb 8 months old: as circular comb teeth wear, each tooth removes more fibre per nip because the tip is blunted — it grasps a wider fibre bundle including longer fibres that should be retained. Worn combs over-comb and increase noil %.