Effect of chemical dosing amount in conventional cotton fabric pretreatment process

Tarikul Islam

doi:10.17485/ijst/v13i23.252

Abstract

Objectives: The objective of the study is to analysis the effect of chemicals on different physical properties and color fastness of treated cotton samples with standard rating values. Methodology: Five single baths are used for the pretreatment process with five different dosages such as 1g/L, 1.5 g/L, 2 g/L, 2.5 g/L, 3 g/L of NaOH and H2O2. After that, reactive dyeing was performed for these five samples with a standard recipe. Findings: With the gradual increment of NaOH and H2O2 dosages, the absorbency and whiteness index of pretreated samples were improved and for that particular reason bursting strength was degraded. On the other hand, for dyed samples, a little variation was observed in color fastness to wash and rubbing but the changes in the color shade of every sample were observable. Keywords: Bleaching; color fastness; physical properties; scouring; shade variation

Highlights

Pretreatment is considered to be the heart of the wet processing of cotton
As an integral part of cotton wet processing, the scouring & bleaching process is usually named as pretreatment
That means due to applying high dosages of NaOH & H2O2, deterioration of cotton gets started due to oxidation, and that’s why less pneumatic pressure is required to burst out the fabric samples

Summary

Introduction

Pretreatment is considered to be the heart of the wet processing of cotton. As an integral part of cotton wet processing, the scouring & bleaching process is usually named as pretreatment. Because of inherited characteristics of comfortability, absorbency, breathability, etc., cotton fabrics are still on the top in the list of people’s demands. As it is a natural cellulosic fiber, it contains about 6% impurities of its total ingredients. Cotton fabric pretreatment process deals with the removal of protein, pectin, oil, wax, fat, mineral substances, etc. As an important part of textile processing, usually, pretreatment contains two processes, such as the scouring process & bleaching process.

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