Rotary and Automated Crocking Methods

Rotary crocking and automated rubbing methods supplement the standard Crockmeter by applying multidirectional, continuous, or elevated-pressure rubbing conditions that simulate specific end-use scenarios — automotive seat fabric under rotational sitting movements, upholstery under continuous directional abrasion, and denim under wrist/cuff contact rubbing. AATCC TM116 (rotary vertical crockmeter, 40 mm × 40 mm rubber pad rotates at 1 rpm with 9 N downward force, 8 rotations): better simulates multidirectional rubbing of seat upholstery and knitwear at flex points (elbows, knees) — rotary crocking grades typically 0.5–1.0 grade lower than reciprocal TM8 for identical fabrics due to cumulative omnidirectional fibre surface disruption. Martindale crocking simulation (ISO 12947-1 adapted with white cloth facing at 1.96 kPa, 500–2,000 Martindale rub cycles): assesses combined abrasion-crocking degradation of printed fabrics — pigment-printed woven fabric crocking grade at 500 Martindale cycles 3–4 versus 4–5 at standard Crockmeter 10 cycles, revealing durability loss from extended abrasion. ISO 105-X16 (colour fastness to rubbing at elevated temperature, 50°C and 70°C): simulates automotive interior exposure (car seat in summer sun reaching 70–80°C interior temperature) — ISO 105-X16 at 70°C gives 0.5–1.5 grade lower crocking than ambient for thermoplastic disperse-dyed polyester automotive fabric (softened dye migrates more readily at elevated temperature). Xenon arc post-crockmeter test (BMW GS 97034, Mercedes MBN 10286): automotive fabric crocked after 5 × Mercedes cycle xenon irradiation (500 kJ/m² at 340 nm) — assesses whether UV degradation of dye-fibre bond reduces crocking resistance over vehicle interior service life. AATCC TM165 (colour transfer from wet fabric to dry fabric under pressure, 10 N/cm² × 5 min): simulates laundry dye transfer between garments in damp pile — grade ≥ 4 required for products sold with 'no dye transfer' claim.