Purpose of mercerizing:
1. Increased gloss and brightness after mercerizing;
2. The adsorption capacity, the chemical reaction capacity is enhanced, and the dye color yield is improved;
3. Shrinkage rate, dimensional stability, and fabric flatness improved;
4. Mechanical properties such as strength and extensibility have changed.
Lye concentration: the main factor affecting the mercerizing effect;
Changes in length and diameter of cotton fiber after treatment with different concentrations of caustic soda solution:
When the concentration is more than 8%, the diameter increases and the length shortens to the maximum.
The shrinkage and dyeing strength of cotton yarn in different concentrations of NaOH solution;
Cotton mercerizing requires concentration (the relationship between C and shrinkage and barium value) when C=177g/L, barium value is 150, C=245g/l, barium value: the highest. C=240~280g/l, the shrinkage tends to be stable.
In actual production, it can be selected according to the quality of semi-finished products and the quality requirements of finished products.