Fiber Tension
Drawing frames pull raw flax silver through multiple roller pairs to align parallel filaments before spinning, and draft triangle rupture occurs when excessive speed differential between the front and middle drafting rollers tears the consolidating web prematurely. Mechanical stress tears the fiber mass because the draft ratio exceeds the natural cohesive limit of unspun flax staple. Flax mills record this failure on daily production logsheets when sliver breaks halt delivery horns on the production floor.
Fiber grade separation depends on staple length consistency, whereas fabric grade classification relies on yarn tensile strength and evenness.
Roll Setting
Roller distance adjustments govern draft triangle rupture prevention during wet spinning preparation. Technicians set drafting zone geometry according to fiber length distributions measured by comb sorters before material reaches the drawing frame. Mill acceptance standards require specific roller bite pressures to maintain strand cohesion, differing from buyer specifications focused on final yarn hairiness limits.
Excessive distance between roller nips widens the drafting zone beyond staple length capabilities, causing uncontrolled fiber sliding and immediate web tearing.
Breakage Limits
Spinning frames operate near draft triangle rupture thresholds to maximize output velocity without inducing frequent yarn end breakage. Operators monitor sliver delivery speed and roller weighting parameters continuously to prevent filament bunching inside the drafting zone. Quality control protocols specify maximum allowable breakage frequencies per spindle shift on the final inspection certificate.
Tension regulation stabilizes internal strand forces across the drafting zone, ensuring yarn uniformity throughout the export batch.
