Structural Separation
Physical separation between the primary and secondary layers of a bast fiber characterizes a specific form of internal damage. Frequent cell wall delamination occurs when the adhesive pectins and hemicelluloses that bind the cellulosic lamellae together fail due to over-retting or excessive chemical processing. This structural breakdown reduces the inherent strength of the flax because the load-bearing capacity of the fiber depends on the integrity of these bonded layers.
Mechanical Cause
Vigorous mechanical extraction during the scutching process often triggers these internal fractures in weakened stalks. If the flax straw remains in the retting field too long, the microorganisms consume the structural binders beyond the middle lamella. Resulting cell wall delamination prevents the fiber from resisting the torsional forces encountered during high-speed wet spinning.
A weakened fiber breaks under the tension of the drafting rollers, leading to high ends-down rates. The separation usually begins at the fiber tips where the protective coating is thinnest and propagates inward toward the center of the bundle.
Spinability Impact
Quality control technicians identify this condition through high-magnification microscopy or by observing a sharp drop in tenacity without a corresponding decrease in fiber fineness. Because the damage is internal, it frequently remains hidden until the yarn reaches the weaving stage. Sudden failures in the loom signify that the cell wall delamination cannot support the cyclic loading required for industrial fabric production.
