To assess the evenness, hairiness, neps and other imperfections in a representative sample of yarn wound at a pre-determined pitch onto a tapered black board. Variable pitch traverse 8 - 19 wraps per centimetre, variable winding speed drive, with yarn package stand and 2 tapered aluminium black boards 575mm x 250mm x 160mm. Assessment against photographic comparison standards ASTM Photographic

 

Standards: GB9996-1988,ASTMD2255