Fiber Strength
Bast strand cohesion is the physical property of plant cellular bundles that resists longitudinal separation during mechanical extraction from the flax stem. This mechanical measurement governs wet spinning performance by determining how much tensile load a ribbon supports before individual microfibrils split apart prematurely. Technicians assess this property through controlled tension clamps on prepared slivers inside mill laboratories.
The standard applies strictly to raw and hackled material before chemical degumming removes the natural pectin binders holding the ultimate cells together.
Binding Quality
Natural hemicellulose and pectin layers cement adjacent filaments inside the primary bast structure to prevent premature shredding during high speed scutching and hackling operations. Machinery operators adjust counter blades and hammer speeds according to the measured resistance of incoming harvests. Mills record these values on quality control sheets alongside moisture readings to determine proper soaking durations in retting tanks.
Buyer contracts specify minimum load thresholds because excessive separation creates weak yarn segments with high hairiness indices.
Spinning Tolerance
Processing machinery demands predictable resistance from plant ribbons to maintain uniform draft ratios across multi roller drawing frames. High resistance prevents drafting unevenness but creates excessive friction against metal pins, while low resistance causes uncontrolled fiber breakage and excessive waste in the combing room. Mill managers establish blending protocols that mix disparate harvests to achieve stable draft behavior throughout commercial production runs.
This continuous monitoring prevents thick and thin spots from developing in the roving before final twist is applied on wet spinning frames.
