Fibre Roundness
Flax sliver preparation relies on mechanical uniformity because natural bast fibres depart from ideal circularity during dry processing. Cross sectional ellipticity quantifies the geometric distortion of individual ultimate cells within the hackling stage before drawing frames align them into roving. Hydraulic pressures applied during wet spinning flatten these minor axes further, producing ribbon shaped filaments that alter packing density inside the bobbin.
Mill supervisors record this parameter on shift logs to adjust drafting roller clearances ahead of the ring frame.
Yarn Tenacity
Mechanical stress tolerance depends heavily upon lateral contact forces between neighboring filaments within the wet spinning bath. Spun flax yarns achieve higher breaking loads when constituent strands maintain moderate cross sectional asymmetry because flattened surfaces increase frictional engagement during twist insertion. Dense packing minimizes void ratios inside the yarn core, restricting moisture penetration during subsequent boiling and bleaching operations.
Commercial contracts establish minimum tenacity thresholds for export grey goods, penalizing lots where fibre deformation falls below specified limits.
Fabric Porosity
Woven linen hand and drape emerge from the geometric arrangement of warp and weft ribbons locked by plain or twill interlacing. Interstitial void geometry shifts directly with fibre deformation, dictating the rate at which liquid finishing agents saturate the dry cloth. Fabric inspection certificates record air permeability results as a proxy for structural openness derived from raw material geometry.
Transverse fibre distortion ultimately governs capillary action during piece dyeing.
