Classimat Defect Matrix Classification
topic
Classimat defect matrix classification (USTER Classimat 5, ISO 16549 supplement) characterises thick and thin places in a two-dimensional matrix of defect length (1–32 cm, 4 length classes doubling each step: 1–2 cm A, 2–4 cm B, 4–8 cm C, 8–32 cm D) versus amplitude (diameter deviation: +45%, +100%, +250%, +400% for thick; −30%, −45%, −60% for thin) producing 23 defect classes per 100 km of tested yarn. Defect classes by fabric impact: Class A (short, moderate thick: 1–2 cm, +45–100%) — invisible in woven fabric at normal viewing distance, no cutting required; Class B (short severe: 1–2 cm, +100–250%) — borderline visible, cut only for premium applications; Class C3, C4 (long severe thick: 4–8 cm, +250%+) — clearly visible as bold place in fabric, must cut; Class I2 (thin, −45%, 1–4 cm) — visible as weak place causing warp breakage in weaving — critical cut class. Classimat EXPERT cut rate optimisation: input clearer sensitivity settings → simulate cut rate at 100 km → predict residual objectionable defects → calculate fabric fault probability per 1,000 m2 → optimise sensitivity to achieve specification defect rate at minimum winding speed penalty. Fabric fault prediction model (USTER Quantum 4): defect frequency in classes C3, C4, D3, D4, I2 × defect visibility factor × fabric construction amplification → faults per 100 m² predicted. Example: Ne 30 ring cotton yarn with C3 frequency 15/100 km at weaving width 1.5 m, 30 warp ends/cm → 15 × (1500 × 3000/100,000) = 0.68 C3 defects per 100 m² — exceeding brand specification of <0.5/100 m² triggers clearer sensitivity increase from +200% to +150% cut threshold.
Role
Classimat defect matrix classification is the data link between spinning mill yarn quality and weaving or knitting fabric fault rate — providing the defect frequency data per 100 km at each size-amplitude class that enables calculation of predicted fabric fault probability and optimisation of winding machine clearer sensitivity settings to achieve zero fabric rejection from yarn-origin defects.