Fine Wet Spun Flax Tenacity and Fibre Morphology
Fine wet-spun flax yarn tenacity depends on controlled pectin softening in the trough, allowing technical bundles to divide into fine elementary cells during draft.
Bast Bundle
Fiber Agglomeration
Aggregated plant stems reach the preliminary grading floor as a raw bast bundle, which represents the structural unit formed by phloem tissues adhering during field retting. Mechanical breakers split these consolidated masses to release individual technical fibers before hackling combs align the strands for spinning frames. Tension applied during drafting pulls the fibrous composite apart longitudinally, converting dense vegetable ribbons into uniform slivers ready for roving.
Mill operators measure linear density in tex units to evaluate how completely the retting process dissolved the pectin binders holding the filaments together.
Tensile Resistance
Breaking tenacity governs how much mechanical load a continuous strand withstands before parting under tension on high speed ring frames. Wet spinning requires higher breaking loads than dry processing because softened filaments stretch continuously inside hot water troughs prior to twist insertion. Inspectors record gram per tex values on conditioned samples using standard dynamometers calibrated for botanical specimens.
Low tenacity readings indicate over retting caused bacterial action to damage cellulose cell walls, whereas excessive rigidity points toward incomplete degumming which prevents proper drafting.
Yarn Uniformity
Mass variation along the continuous strand determines the classification grade assigned to finished yarns before commercial release to weaving departments. Electronic capacitance sensors measure cross sectional changes continuously as material passes through testing slots at constant speeds. High irregularity values produce visible faults in woven linen fabrics during final finishing stages, leading downstream buyers to reject specific lots.
Strict acceptance criteria demand lower coefficients of variation for warp yarns than for weft yarns due to the mechanical stress exerted by shedding mechanisms on looms.