Structural Transformation
Chemical alteration of the inner lattice of flax fibers occurs when concentrated sodium hydroxide forces the parallel polymer chains to rearrange into a more stable anti-parallel pattern. This alkali mercerization crystal shift changes the density of the crystalline regions and increases the amorphous areas within the cell wall. The transformation improves the dye uptake and tensile strength of the linen fabric by making more hydroxyl groups accessible to chemical bonding.
Process Measurement
X-ray diffraction patterns provide the primary means of measuring this atomic reorganization after the finishing bath. Technicians compare the peak intensity of native cellulose at specific angles against the new peaks of the hydrated structure to calculate the conversion percentage. A high conversion rate indicates uniform exposure, whereas residual native peaks point to uneven tension or insufficient sodium hydroxide concentration.
The results are recorded in the mercerization quality log to certify that the linen meets buyer specifications for lustre and dimensional stability.
Chemical Limitation
Excessive exposure to high-temperature alkaline baths degrades the cellulose chains and reduces the overall yarn strength. Lower concentrations or shorter contact times leave the fiber core unmodified, resulting in patchy dye absorption. Correct execution relies on strict temperature control below fifteen degrees Celsius to maintain the required swelling action.
