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Dyeing and Printing Theory

Code 15798
Year 1
Semester S2
ECTS Credits 6
Workload PL(30H)/T(30H)
Scientific area Ciência e Tecnologia Têxteis
Entry requirements ---
Learning outcomes Fundamentals of color measurement and formulation techniques and color correction. Relationship between the fiber structure and the structure of the dyes.
Knowledge the theoretical bases of dyeing kinetics and equilibrium and infer its importance in dyeing of textile materials. The student should be able to:
1 analyze, interpret and apply the concepts of color measurement, with a view to their implementation in the color reproduction in printing and dyeing;
2 Understand the theoretical foundations of physical chemistry of dyes in order to be able to understand the role of all actors (fiber, dye, chemicals and auxiliaries, pH, temperature, time, etc.) in the process of dyeing and printing of textile fibers and holding its innovation, optimization and control, with a view to quality excellence in economic and technical perspective of industrial operation.
Syllabus 1. Definition of Color. Spectrophotometric and colorimetric concepts.
2. CIE colorimetric system. Metamerism. Color differences. CIELAB system. Degree of whiteness. Light sources and illuminants.
3. Color ordering systems.
4. Color reproduction by colorimetric and spectrophotometric. Color correction.
5. Relationship between the chemical and physical structure of the fibers and the structure of the dyes.
6. Dyeing equilibrium: isotherms, affinity, electrical effects and heat of dyeing.
7. Dyeing kinetics: diffusion, velocity, kinetic equations, activation energy, equalization and compatibility.
8. Characterization of the dyeing properties of dyes.
Main Bibliography 1) M. Clark, Handbook of textile and industrial dyeing - Volume 1: Principles, processes and types of dyes, Woodhead Publishing, 2011.
2) R. H. Wardman, An Introduction to Textile Coloration: Principles and Practice, Wiley (Society of Dyers and Colorists), 1st ed., 2017.
3) S. M. Burkinshaw, Physico-chemical Aspects of Textile Coloration, Wiley (Society of Dyers and Colorists), 1st ed., 2015.
4) Johnson, The Theory of Coloration of Textiles, Published by the Society of Dyers and Colourists, 2nd Ed, 1989.
5) J. Cegarra; P. Puente e J. Valldeperas, Dyeing of Textile Materials, Textilia, 1992.
6) J. Shore (Editor), Cellulosics Dyeing, Society of Dyers and Colourists, 1995.
7) 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.
Teaching Methodologies and Assessment Criteria The course is structured in theoretical and practical-laboratory classes. The teaching and learning methodology will be student-centered. The teacher, in theoretical classes, exposes the contents of the curricular unit and presents examples and applications for discussion, encouraging reflection and problem solving. The practical-laboratory classes will take place in the Dyeing Laboratory, where the students can work with different machines/equipment and carry out various experimental works in the area of dyeing technology. Students must prepare, at the end of each experimental work, a written report in which they must apply the acquired knowledge and scientifically discuss the results obtained. The UC assessment consists of a written test (during the teachinglearning period) with a weight of 70%, and the continuous assessment of the laboratory component (including reports and discussion) with a weight of 30 %.
Language Portuguese. Tutorial support is available in English.
Last updated on: 2024-01-18

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