Effect of corona discharge treatment on indigo dyed cotton fabric

Abstract

The present study proposes new conditions for achieving the aged‐look effect of denim. Indigo dyed cotton fabrics were treated by corona discharge at different power levels and number of passages. Colorimetric parameters of corona treatment were assessed by the CIE L*a*b* colorimetric system and the pH and colour fastness of samples were tested. The surfaces of dyed samples were studied by scanning electron microscopy and Fourier Transform–infrared/attenuated total reflectance (FTIR/ATR) analysis. Under the same conditions of corona treatment, the faded‐look effect was reduced as the depth of dyeing was increased. Increasing the power and the number of passages increases L* and b* and decreases a* values. This indicates that samples become lighter and yellower but soaping can reduce yellowness. FTIR/ATR results show that indigo dye oxidises, and isatin and anthranilic acid are produced. The pH levels of corona‐treated samples reduce as the power and number of passages increase. This acidification is in agreement with the results of FTIR/ATR analysis.

Application of corona discharge to modify the surface layer of polyester textiles

“…Zmiany chemiczne w warstwie wierzchniej tkaniny poliestrowej polegaj¹ce na powstawaniu grup kwasowych pod wp³ywem wy³adowañ koronowych, oceniano na podstawie testu wybarwialnooeci [6,7]. Badane próbki zanurzano w wodnym roztworze b³êkitu metylenowego o stê¿eniu 10 -3 M, barwiono je w ci¹gu 10 min, p³ukano w wodzie destylowanej i suszono w temperaturze pokojowej.…”

“…Nastêpnie, metod¹ spektrofotometryczn¹ okreoelano ró¿nice ich zabarwienia (∆E) w stosunku do barw wzorca czyli próbki niemodyfikowanej. Pomiary przeprowadzono w uk³adzie barw CIE Lab, z zastosowaniem oewiat³a D65 (uoerednione oewiat³o dzienne z udzia-³em ultrafioletu) oraz k¹ta obserwacji 10 o [7]. Wartooeci oznaczone symbolami "L", "a" oraz "b" s¹ trzema sk³adowymi opisuj¹cymi badan¹ barwê, mianowicie Lcharakteryzuje jasnooeae i przybiera wartooeci z przedzia³u od 0 (czerñ) do 100 (biel), a -odpowiada zmianie barwy od zielonej (wartooeci ujemne) do czerwonej (wartooeci dodatnie), natomiast b -zmianie barwy od niebieskiej (wartooeci ujemne) do ¿ó³tej (wartooeci dodatnie).…”

Use of a carbon dioxide laser for environmentally beneficial generation of distressed/faded effects on indigo dyed denim fabric: Evaluation of colour change, fibre morphology, degradation and textile properties

“…In the recent years, many researcher s (Jucienė et al 2014 andKan, 2014) have explored the use of lasers to partially remove surface colour and determine important parameters that affect colour change. Other forms of surface treatment such as corona discharge (Nourbakhsh and Yazdanshenas, 2008) and plasma (Ghoranneviss et al, 2007) have also been explored.…”

Comparison between nano and micro silicon softener on corona discharge-treated cotton fabric

“…Plasma corona discharge method is a technique for the treatment of fibres, fabrics and polymeric materials in a dry system, which consists of the application of an electrical discharge. The discharge is an ionized state of air and is achieved by applying high-frequency voltage between the two electrodes [1–3]. The use of gas discharging modifies the surface properties of the polymeric materials.…”

“…In previous studies, researchers used corona plasma discharge for improving the adhesion of coatings, treating fibers such as wool, mohair, cotton and textiles made from synthetic fibers. Corona and plasma treatments improve wool and mohair yarn strength and shrinkage behavior, increase wetability and soil repellency, reduce the tendency to generate a static charge, increase fabric abrasion resistance and improve carding, spinability and cotton properties after mercerization and cause the decoloration of denim [1–12].…”