Source: Tekstilna Industija
Pre-treatment process of cotton knitted fabrics made from different grade cotton fibers with variable physicochemical properties using a single recipe was investigated to obtain a more comprehensive picture about the reproducibility and repeatability of the process. Single jersey knitted fabrics with different characteristic properties, were subjected to same pre-treatment processes. This, pre-treatment processes included acid demineralization and one bath scouring, peroxide bleaching and optical brightening. The fabrics made of different grade cotton fibers were monitored for metallic impurities, as well the whiteness index, and colour coordinates during different steps of finishing and washing. The stability of whiteness after first and fifth washing cycles with detergent for white programme carried out in industrial washing machine was analyzed by Berger scale and colour coordinates and compared with bleached-thermo stabilized knitted fabric.
The results obtained showed that the pre-treatment
process of demineralization followed by one bath scouring, peroxide bleaching
and optical brightening is stable giving knitted fabrics with whiteness index
with variance coefficient less than three in all three different grade of
cotton. Knitted fabrics after first washing cycle have the same whiteness index
The authors are associated with University Sts. "Cyril and Methodius" Faculty of Technology and Metallurgy, Skopje, Macedonia
Originally published in Tekstilna Industija, December 2010
The authors are grateful to EAM Confection Štip for founding and providing samples for this study.