What is the main difference between liquid ammonia mercerization and conventional caustic soda mercerization?

Liquid ammonia mercerizing is to use ammonia, which has a small molecule, permeates the fabric quickly, and can enter the fiber to make the fiber expand instead of caustic soda to obtain mercerizing effect. The fabrics mercerized with liquid ammonia can not achieve the effect of caustic soda mercerization in two main aspects: luster and dyeing color yield, and can not completely replace caustic soda mercerization.

After the fabric is soaked in liquid ammonia, the tension is adjusted, the ammonia is removed by drying and steaming, and then the fabric is pre-shrunk to achieve the effects of wrinkle resistance, wrinkle resistance, shrinkage prevention and hand feeling improvement. Therefore, pretreatment with liquid ammonia alone cannot be regarded as mercerizing process. Only through mechanical pre-shrinking finishing can we get good anti-shrinkage and anti-wrinkle effect, and liquid ammonia has a good synergistic effect. Therefore, it is more appropriate to call it "liquid ammonia treatment".

Compared with alkali mercerizing, liquid ammonia mercerized fabric is especially smooth, soft to the touch, and its strength and dry-wet resilience are obviously improved. This can not be achieved by conventional softening or pre-shrinking processing.

The next process after liquid ammonia treatment is especially suitable for wet crosslinking and dry crosslinking, which can not only ensure DP value, but also obtain higher handle requirements.