title: Pad ultrasonic batch dyeing of causticized lyocell fabric with reactive dyes.
abstract: Conventionally, cellulosic fabric dyed with reactive dyes requires significant amount of salt. However, the dyeing of a solvent spun regenerated cellulosic fiber is a critical process. This paper presents the dyeing results of lyocell fabrics dyed with conventional pad batch (CPB) and pad ultrasonic batch (PUB) processes. The dyeing of lyocell fabrics was carried out with two commercial dyes namely Drimarine Blue CL-BR and Ramazol Blue RGB. Dyeing parameters including concentration of sodium hydroxide, sodium carbonate and dwell time were compared for the two processes. The outcomes show that PUB dyed samples offered reasonably higher color yield and dye fixation than CPB dyed samples. A remarkable reduction of 12h in batching time, 18ml/l in NaOH and 05g/l in Na2CO3quantity was observed for PUB processed samples producing similar results compared to CPB process, making PUB a more economical, productive and an environment friendly process. Color fastness examination witnessed identical results for both PUB and CPB methods. No significant change in surface morphology of PUB processed samples was observed through scanning electron microscope (SEM) analysis.
authors: Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76060, Pakistan. Electronic address: aijaz@admin.muet.edu.pk.
authors: Aijaz Ahmed
authors: AA
authors: Babar
authors: Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76060, Pakistan. Electronic address: Mazhar.peerzada@faculty.muet.edu.pk.
authors: Mazhar Hussain
authors: MH
authors: Peerzada
authors: Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76060, Pakistan.
authors: Abdul Khalique
authors: AK
authors: Jhatial
authors: Department of Textile Engineering, Mehran University of Engineering and Technology, Jamshoro 76060, Pakistan. Electronic address: Noor06te29@gmail.com.
authors: Noor-Ul-Ain
authors: NU
authors: Bughio
keywords: CPB process; Color yield; Dye fixation; Lyocell; PUB process; Reactive dyes