Reactive Pad-Batch Dyeing in CORONA Discharged Fabrics

Abstract

The present work aims to the study of the increase of pickup , together with uniformity degree, concerning the application of reactive dyeing baths by padding in a dry cotton fabric previously treated with CORONA discharge. Dyeing recipes, with and without wetting agent, are compared and advantages of CORONA discharge are analysed. Reactive dyes are used, expecting also to increase washing fastness of the difficult dark colours due to higher penetration of the dye into the core of the fibres when submitted to plasmatic treatment. The use of CORONA discharge intends to modify hydrophility of cotton fabrics even when they are presented to padding in hydrophobic state. A good alternative to wetting agent presence in recipes is found and more uniform and intense dyeings are performed in all cases.

Polymer Nanocomposites for Multifunctional Finishing of Textiles - a Review

“…Some inert textile surfaces need to be pretreated making certain functional groups available for bonding with PN finishing. Some of the treatments, such as hydroxylamine treatment and plasma discharges, are used for surface pretreatment of fabrics [24,25]. Plasmatic treatments in several textile substrates like cotton, linen, wool and synthetic fibers were studied proving that this type of treatment increases whiteness degree, removal of waxes and sizing agents, absorption and fixation of dyes and finishing agents, improves durability of functional effects and is able to provide certain functional groups available to bind PN [26][27][28][29][30].…”

It must be green: meeting society’s environmental concerns

“… attaining approaching 90% dye fixation on cellulosic fibres by batchwise dyeing using poly‐functional reactive dyes [51,52]; considerably shortening the total dyeing time and energy consumption when batchwise dyeing disperse and reactive dyes to produce blacks on polyester/cotton blends [53]; more than halving the energy, water and chemical consumption in the continuous dyeing of polyester/cotton blends [54] and a reawakened interest in cold pad–batch dyeing processes using reactive dyes [55,56]. …”