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.