Dyeing of Untreated Cotton By One-Bath Combined Process Using Various Enzymes

84th Annual World Conference, North Carolina, Amerika Birleşik Devletleri, 22 - 25 Mart 2005, ss.1-10

The essential step of level dyeings with high fastness properties of any textile materials

is the preparatory processes which include mainly desizing, scouring and bleaching for

cellulosic fabrics. Bio-preparation of cellulosic materials is a widely used process

nowadays and presents many benefits compared to the conventional preparatory

processes. In the bio-process of cellulosic materials, various enzymes can be used and

the treatment undergoes in mild and environmentally friendly conditions, compared

with those in the conventional processes.

In this work, C.I. Reactive Yellow 15, C.I. Reactive Red 21 and C.I. Reactive Blue 19

were used to dye untreated woven cotton fabrics in single-bath combined processes

using various enzymes, namely, amylase, pectinase, and catalase. In this single-bath

combined process, the untreated, starch-sized fabric was first desized by amylase, and

this was followed by a pectinase treatment in the same bath. The fabric was then

bleached by hydrogen peroxide in the same bath and after the hydrogen peroxide

bleaching, the catalase enzyme was added to the bath. Without carrying out any

intermediate washings/rinsing between these processes, the reactive dyeing was carried

out by a conventional way in the same bath, and finally the fabric was taken from the

bath and washed to remove unfixed dyes. The colour yield, dyeing fastnesses, dyeing

repeatability and tensile strengths of the dyed materials were compared with those of the

dyeings which were carried out conventionally in separate baths. This new process has

many benefits in terms of water savings, reducing process times and energy

consumptions, compared to the conventional preparatory and dyeing processes of cotton

fabrics.