Quality Assurance
Quality control procedures evaluate physical yarn parameters before weaving or wet processing to isolate structural defects at the spinning stage. Physical evaluation through greige yarn testing records parameters such as single-thread tensile strength, yarn count variations, twist per meter and moisture content in raw linen yarn. Chinese spinning facilities perform these physical evaluations on bobbin samples collected from ring spinning frames to verify compliance with mill standards.
The evaluation establishes physical boundaries for yarn performance and stops at the point where chemical scouring, bleaching or dyeing alters the native fiber matrix.
Laboratory Protocol
Electronic yarn evenness testers measure mass variation along continuous lengths of unsized flax yarn using capacitive sensor fields. Standardized greige yarn testing protocols require conditioning yarn packages inside a controlled environment at 20 degrees Celsius and 65 percent relative humidity for 24 hours prior to testing. Technicians measure breaking tenacity on automated single-yarn strength testers while recording elongation percentages across ten random bobbins per production lot.
Deviations in mass uniformity reveal drafting irregularities during wet spinning.
Warp Preparation
High-speed rapier looms exert severe tension force on warp threads during shedding operations. Low tensile strength values identified during greige yarn testing warn weaving managers to reduce loom operating speeds or apply specialized PVA sizing formulations to prevent end breaks. Yarn packages failing minimum twist thresholds undergo rewinding or re-sorting before beam warping.
Proper mechanical evaluation prevents weaving efficiency losses caused by weak thread segments.
