Molecular Origin
Physical rupture within the polymeric chains of flax bast fibers represents a severe form of structural degradation in textile processing. Such rupture, formally classified as cellulose microfibril damage, occurs when chemical or mechanical stresses exceed the tensile threshold of the native flax cell wall. This disruption typically takes place during aggressive scutching or during excessive bleaching stages in Chinese mills.
The damage weakens the internal scaffolding of the fiber, leading to premature fiber breakage during subsequent spinning.
Measurement Protocol
Testing laboratories utilize viscosity measurements of fiber solutions in cupriethylenediamine to quantify the extent of polymer breakdown. The procedure begins with the dissolution of purified flax fibers in the solvent under controlled temperature conditions to prevent additional oxidation. An analyst measures the efflux time of the solution through a calibrated capillary viscometer to determine the intrinsic viscosity.
This diagnostic assessment tracks the degree of polymerization to reveal the microscopic health of the flax before yarn formation occurs. A high viscosity value confirms that the long-chain polymers remain largely intact during wet preparation. Conversely, a depressed viscosity reading signals that cellulose microfibril damage has occurred.
Tensile Influence
Spinning operations suffer from elevated end-down rates when the underlying fiber structure is compromised. The presence of cellulose microfibril damage limits the maximum spinning tension a yarn can withstand on wet-spinning frames. It also reduces yarn strength.
