Improvement of dye affinity in natural dyeing usingTerminalia chebula retzius(T. chebula) applied to leather

Abstract

Purpose The purpose of this paper is to improve the dye affinity of natural dye of Terminalia chebula retzius (T. chebula) using the dye substrate of leather. Design/methodology/approach The dyeing conditions such as temperature, concentration of dye, and time are controlled by measuring the dye affinity. The effect of enzymatic post-tanning process on dye affinity is evaluated by using different type of proteases such as flavourzyme, alcalase, and bromelain. The optimum conditions for enzymatic post-tanning process are evaluated depending on different pH, temperature, and concentration of enzyme. Findings The highest dye affinity was obtained at 50°C using a dye concentration of 200 percent (owf) for 30 min treatment by measuring of K/S values of dyed leather. Distilled water was proved as a better extraction liquid to improve the dye affinity of T. chebula. The K/S values of dyed leather were enhanced after the enzymatic post-tanning process by flavourzyme. Moreover, the fastness properties against the rubbing and dry cleaning of the dyed leather were improved by the enzymatic post-tanning process. Originality/value In this paper, the enzymatic post-tanning process is introduced as the method to improve the dye affinity in natural dyeing using Terminalia chebula retzius (T. chebula) applied to leather. The results of the study could be applied for further natural dyeing of leather using various natural dyes.

Wet Blue Enzymatic Treatment and Its Effect on Leather Properties and Post-Tanning Processes

“…Few studies have been performed with the aim of evaluating dyeing or fat-liquoring efficiency after using EP in re-bating. Song et al [ 35 ] applied different types of proteases in crust leather dying; study demonstrated better dye absorption in treated leather. Other studies [ 36 , 37 ] with protease in leather dyeing showed high dye exhaustion and better distribution of colour in the finished product.…”

Proceedings of the 9th International Conference on Advanced Materials and Systems

“…Nevertheless, there is limited information on ferment usage in post-tanning operations, though these processes are also extremely important for finished leather. Song et al (2017), did research on the protease effect on crust leather dyeing. The study showed better fastness properties against rubbing and better dyes absorption in treated leather.…”

Enzymes for Leather Processing: Effect on Pickling and Chroming

“…A post-tanning enzymatic treatment changes the properties of the leather and thus influences the subsequent processes. The study of Song et al [ 26 ] has shown that leather treated with protease flavourzyme showed improved fastness properties against rubbing and dry cleaning compared with untreated leather. The use of enzymes directly in leather dyeing has led to better exhaustion of dye as collagenase-assisted process allows reaching 99% uptake of dye [ 27 ].…”