Dyeing Technology

Code	15800
Year	2
Semester	S1
ECTS Credits	6
Workload	PL(45H)/TP(30H)
Scientific area	Ciência e Tecnologia Têxteis
Entry requirements	---
Learning outcomes	Study the different application processes of dyes suitable for dyeing of different textile materials (single and mixed) in the various stages of processing. Acquisition of knowledge in terms of machines used, quality control and dyeing costs. Understand the influence of different physical and chemical and thermodynamic parameters on dyeing processes and its influence on the quality of the final product. Describe and analyze the various dyeing processes with the most important class of dyes for each textile fiber and fiber mixtures. Select the most suitable dyeing process for each type of material. Identify and characterize the different constituent parts of the various machines used in dyeing, as well as relate their action on the dyeing process. Perform experimental work that simulates industrial dyeing operations and discuss the results obtained. Evaluate the quality of the dyeing process, costs and environmental implications.
Syllabus	Fundamental aspects of pre-treatment of the main textile fibers. Dyeing processes using different classes of dyes in the main textile fibers: cellulosic, protein, artificial and synthetic. Dyeing of mixed fibers. Analysis of different dyeing processes. Study of the different factors that influence the dyeing processes. Control of dyeing processes and quality of dyed materials. Machines used in pre-treatment and dyeing processes. Discontinuous, continuous and semi- continuous processes. Exhaustion dyeing machines: characteristics, theoretical model of package dyeing. Pad dyeing machines: fundamental aspects of padding and fixation process of dyes applied by padding. Production planning and cost calculation. Environmental aspects in the dyeing process.
Main Bibliography	M. Clark, Handbook of textile and industrial dyeing - Volume 1: Principles, processes and types of dyes, Woodhead Publishing, 2011. R. H. Wardman, An Introduction to Textile Coloration: Principles and Practice, Wiley (Society of Dyers and Colorists), 1st ed., 2017. S. M. Burkinshaw, Physico-chemical Aspects of Textile Coloration, Wiley (Society of Dyers and Colorists), 1st ed., 2015. A. Johnson, The Theory of Coloration of Textiles, Published by the Society of Dyers and Colourists, 2nd Ed, 1989. J. Cegarra; P. Puente e J. Valldeperas, Dyeing of Textile Materials, Textilia, 1992. J. Shore (Editor), Cellulosics Dyeing, Society of Dyers and Colourists, 1995. D. M. Lewis (Editor), J. A. Rippon (Editor), The Coloration of Wool and Other Keratin Fibres, Wiley (Society of Dyers and Colourists), 1st ed., 2013. D.Pinto, 1st edition, Corantes Reativos para Fibras Celulósicas., FEUP.
Teaching Methodologies and Assessment Criteria	The course is conducted through theoretical-practical and practical-laboratory classes. The teaching and learning methodology is student-centered. In theoretical-practical classes, the instructor presents the course content and introduces examples and applications for discussion, encouraging reflection and problem-solving. At the end of each experimental task, students are required to prepare a written report in which they apply the acquired knowledge and scientifically discuss the results obtained. The course assessment includes a written midterm examination (conducted during the teaching-learning period) with a weight of 50% and continuous evaluation of the laboratory component (including reports and discussions) with a weight of 50%.
Language	Portuguese. Tutorial support is available in English.