Mass Ratio
Mass per unit length expresses the fineness of plant fiber bundles, governing drafting performance and minimum achievable yarn count in mechanical spinning. Laboratory technicians measure flax linear density in decitex or tex units to classify raw fiber lots following scutching and hackling. Finer bundles contain fewer elementary cells in cross-section, enabling smooth attenuation during drafting.
This physical property determines yarn fineness boundaries in commercial mills.
Spinning Influence
Hackling repeatedly splits raw fiber bundles along their length, reducing mass per unit length while removing short fragments and shives. Coarser fiber structures with higher mass values resist drafting and require higher twist levels to maintain strand strength during spinning. Variations in flax linear density cause thickness fluctuations along roving strands, creating slubs and thin places in finished yarn.
Spinners adjust pin density on drawing frames to manage bundle splitting and achieve uniform linear mass before wet spinning. Consistent fiber fineness permits the production of high-count yarns for fine apparel fabrics.
Grade Classification
Commercial grading systems classify fiber shipments into distinct fineness categories based on average linear density metrics. Purchasing agreements specify target decitex ranges with price adjustments for coarse deliveries. Verification testing at mill entry confirms raw material alignment with fabric production schedules.
