Lesson 1Reporting and documenting spinning quality data for follow-upYou'll look at best ways to record, check, and share spinning quality data. It covers report styles, tracking, pattern spotting, and supporting fixes and prevention steps.
Standard formats for daily and shift reportsTraceability from bale mix to yarn packageTrend charts and exception reportingCommunicating results to production teamsArchiving data for audits and customersLesson 2Yarn count systems and typical ranges for T-shirts and casual pants (Ne, tex)You'll go over yarn count systems like Ne and tex, and usual ranges for T-shirts and casual trousers. It connects count choice to fabric weight, feel, and machine needs.
Converting between Ne, tex, and denierCount ranges for jersey and interlock T-shirtsCounts for casual pants and twill fabricsEffect of yarn count on GSM and cover factorCount selection for knitting versus weavingLesson 3Key spinning process parameters to monitor (draft, roving, spindle speed, twist, clearers)This part points out main spinning settings like draft, roving qualities, spindle speed, twist, and cleaners. You'll see how changes affect yarn quality, output, and breaks.
Draft settings at draw frame and ring frameRoving count, twist, and uniformity controlSpindle speed, traveler selection, and heatRing frame twist and winding tensionElectronic clearer sensitivity and cut settingsLesson 4Common spinning defects causing gsm variability, shade issues, and pilling (neps, slubs, inconsistent counts)This part checks common spinning faults like neps, slubs, and count changes that lead to weight variation, colour problems, and pilling. You'll link fault signs to causes and fixes.
Neps: sources, detection, and controlSlubs and thick places in ring and rotor yarnsCount variation and its impact on GSMDefects leading to barre and shade streaksProcess adjustments to reduce pilling riskLesson 5Spinning methods: ring, open-end, rotor; expected yarn quality differencesYou'll compare ring, rotor, and open-end spinning, looking at machine workings and yarn results. It shows differences in strength, smoothness, hairiness, and common uses.
Principles of ring spinning and yarn structureRotor and open-end spinning fundamentalsQuality differences between ring and rotor yarnsEnd-use mapping for each spinning methodCost, productivity, and quality trade-offsLesson 6Cotton fiber types and properties (Staple length, micronaire, maturity)You'll study main cotton fibre types and key qualities like length, micronaire, and maturity. It links fibre traits to spinning ease, yarn strength, evenness, and end-use results.
Short, medium, and long staple cotton categoriesMicronaire ranges and processing implicationsFiber maturity, fineness, and dye uptakeTrash, neps, and stickiness in raw cottonSelecting fiber mixes for target yarn countsLesson 7Acceptable tolerances and control limits for yarn count CV%, tenacity, and hairinessHere we set allowed variations and limits for yarn count CV%, strength, and hairiness. It shows how to pick real targets, read control charts, and handle off-limit signals.
Setting target values and specification windowsControl charts for count CV% and evennessTenacity and elongation limits by end-useHairiness indices and acceptable rangesActions for out-of-limit or trending dataLesson 8Twist levels and their impact on strength, hairiness, and pillingThis part explains twist basics and how twist amount affects yarn strength, hairiness, pilling, and feel. You'll match twist factor to count, use, and spinning type for good balance.
Twist direction, twist multiplier, and countTwist versus tensile strength relationshipInfluence of twist on hairiness and pillingTwist effects on handle, bulk, and drapeOptimizing twist for knit and woven applicationsLesson 9Sampling plans and test frequencies for yarn productionThis part covers making sampling plans and test timings for blowroom, carding, roving, and spinning. Focus is on stats soundness, cost balance, and spotting process shifts early.
Lot-based and shift-based sampling schemesDetermining minimum sample size for yarn testsFrequency of tests by machine and process stageRandomization and avoidance of sampling biasLinking sampling intensity to risk levelLesson 10Laboratory and in-line tests: Uster testing (evenness, CV%), strength, elongation, hairiness, nep countsThis part details lab and on-line tests, focusing on Uster evenness, strength, stretch, hairiness, and neps. You'll compare methods, sample spots, and Uster stats reading.
Principles of Uster evenness and CV% testingMeasuring yarn strength and elongationHairiness and nep count test proceduresIn-line clearer data versus lab test resultsUsing Uster Statistics for benchmarking
