Determining Flax Staple Profile Using Manual Comb Sorting
Manual comb sorting by ISO 2370 isolates technical flax bundle length profiles to prevent drafting waves, control short fibre content, and enforce purchase contracts.
Flax Fiber Linear Density
Mass Measurement
Mass per unit length measured in tex or decitex defines the fineness of plant bast strands prior to drafting and yarn formation. In flax fiber linear density testing, laboratory technicians evaluate bundles of hackled flax or scythed stricks to determine average strand thickness. Finer fibres yield higher yarn counts and softer hand feel in finished linen fabrics.
Measurement accuracy dictates draft ratios.
Spinning Impact
Strand thickness directly determines the minimum number of individual fibres required in a yarn cross-section to maintain tensile strength during wet spinning. Coarse bast bundles with high linear mass yield stiff yarns that resist drafting and break under tension on high-speed ring spinning frames. Chinese spinning mills process imported and domestic flax through rove preparation equipment, adjusting draft roll gaps to match the measured flax fiber linear density of each fibre lot.
Finer fibre lots allow higher draft ratios, producing smooth, high-count yarns suitable for fine apparel fabrics. Coarser lots go toward heavier duck or decorative upholstery weaves where bulk and texture are desired.
Grading Standard
Linear mass values remain valid only when moisture content is standardized according to official testing guidelines. Standard atmosphere conditions of sixty-five percent relative humidity at twenty degrees Celsius prevent weight distortion from moisture absorption. Laboratory test certificates record linear density alongside bundle tenacity to establish raw material purchasing prices.