Ends and Picks That Deliver a Target Weight in Linen
Target linen weight depends on yarn tex, ends, picks, and crimp contraction; calculating raw count without finishing shrinkage overshoots mass targets.
Cross Web Mass Matrix
Transverse Density Profile
Carding machine sensors record the areal mass distribution across the width of a flax card web at specified millimeter intervals. A cross web mass matrix arranges these spatial density values into a two-dimensional grid representing fiber distribution before sliver formation. Optical or capacitive sensors output continuous milligram readings per square centimeter across the card cylinder.
Deviations beyond five percent across the transverse width highlight uneven flax feeding or worn card clothing wires.
Sliver Weight Deviation
Uneven density across the web transfers directly into drafting wave defects during subsequent draw frame passes. When wet spinning mills process flax sliver derived from non-uniform webs, draft zone forces pull thinner fiber groupings faster than dense bunches. The cross web mass matrix identifies whether mass fluctuations stem from mechanical misalignment of the feed roller or localized air turbulence inside the carding chamber.
Mill engineers calibrate feed plate gaps based on matrix variance figures.
Drafting Limit Condition
Acceptance thresholds for card web uniformity dictate whether flax slivers proceed to wet drawing or return to the opening room for re-blending. Standard operating procedures in high-count yarn mills cap matrix variance at three percent. A cross web mass matrix failing this threshold triggers immediate automated stoppage of the carding line.