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Lecturer(s)
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Neckář Bohuslav, prof. Ing. DrSc.
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Vyšanská Monika, Ing. Ph.D.
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Krupincová Gabriela, Ing. Ph.D., Ing.Paed.IGIP
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Mertová Iva, Ing. Ph.D.
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Course content
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Lectures: 1. Fiber and fiber assemblies. Basic quantities and relations describing fibers and general fiber assemblies. (Fiber fineness, cross-section, equivalent diameter, shape factor, specific surface, packing density and its interpretations, etc.) 2. Fiber and fiber assemblies. Mean fiber parameters in multi-componential fiber assemblies (blends). 3. Fiber and fiber assemblies. Porosity and pores among fibers. Equivalent pore diameter in general fiber assemblies, length of pores, pores with a constant shape factor, pores with a constant length, empirically generalized pores. 4. Fiber and fiber assemblies. Tenacity of fiber bundle from two components, "linear theory of blending", conditions of straining of fiber assembly. 5. Yarn and multifilament. Basic quantities and relations (fineness, substance cross-section and substance diameter, yarn diameter, number of fibers in cross-section and coefficient kn, twist intensity, twist factors). 6. Yarn and multifilament. Relation among yarn fineness, twist and diameter. Koechlin's theory and its empirical generalization. 7. Yarn and multifilament. Geometry of helical yarn model. (Helical and ideal helical model, number of fibers in cross-section and coefficient kn for different technologies, yarn retraction, derivation of saturated twist and twist of the second order.) 8. Yarn and multifilament. Yarn axial straining and yarn tenacity. (The influence of twisting to course of yarn straining according to Gegauff's model and its generalization, stress-strain curve of twisted fiber bundle by ideal helical mdel.) 9. Yarn and multifilament. Yarn axial straining and yarn tenacity - semi-empirical model according to Solovev. 10. Woven fabrics. Basic quantities and relations describing woven fabrics. (Interlacing of threads, binding factors, covering and cover-factor of woven fabrics by warp and weft, relation between covering and packing density, crimp of threads, thickness of fabric.) 11. Woven fabrics. Fabric geometry according to Peirce's model. (Overview of interpretation of fabric geometry, Peirce's model, geometrical parameters and their mutual relations, relative height of binding waves, crimp of threads.) 12. Woven fabrics. Fabric geometry according to Peirce's model. Some special cases of Peirce's model (limit set, etc.) 13. Knitted fabrics. Basic quantities and relations describing knitted fabrics. (Density and spacing of rows and columns, approximate expression of covering by means of ratio l/d, simple model of the loop of single weft-knitted fabric, geometrical relations, theoretical calculation of length of thread in loop, limit spacing of rows and columns, etc.) 14. Knitted fabrics. Covering of single weft-knitted fabric. Geometry of cover of threads, "exact" calculation of cover-factor, comparison with approximate l/d. Practices: 1. Fiber and fiber assemblies. Basic quantities and relations describing fibers and general fiber assemblies. 2. Fiber and fiber assemblies. Packing density and its interpretation. 3. Fiber and fiber assemblies. Calculation of porosity and pore dimensions among fibers. 4.-5. Fiber and fiber assemblies. Calculation of mean parameters of fiber blends. 5. Fiber and fiber assemblies. Prediction of strength of fiber bundle from two components according to "linear theory of blending". 6. Yarn and multifilament. Basic quantities and relations describing yarns and multifilament. 7. Yarn and multifilament. Application of Koechlin's theory. 8. Yarn and multifilament. Calculation of helical and ideal helical models. 9. Yarn and multifilament. Calculation of yarn strength according to ideal helical model. 10. Yarn and multifilament. Calculation of yarn strength according to Solovev's model. 11. Woven fabrics. Basic quantities and relations describing woven fabrics. 12. Woven fabrics. Calculation of geometry according to Piece's model. 13. Knitted fabrics. Basic quantities and relations describing knitted fabrics, calculation of covering. 14. Final test.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Dialogue metods(conversation,discussion,brainstorming), Lecture, Practicum
- Class attendance
- 56 hours per semester
- Home preparation for classes
- 30 hours per semester
- Preparation for comprehensive test
- 20 hours per semester
- Preparation for exam
- 40 hours per semester
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Learning outcomes
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The subject follows the basic subject Textile Technology 1. Students will be acquainted with basic quantities and relations which are valid in textile fiber assemblies: fibers and its blends, fiber bundles, linear fiber assemblies - multifilaments and yarns, and areal textiles - woven and knitted products. Within practices - students rearrange resulting equations from lectures to the suitable physical dimensions, apply it, and so they obtain the basic image about order of values of quantities. Students obtain also other information about technological relations.
Ability to understand behavior of fiber structures and ability for utilization of their specific properties.
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Prerequisites
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Knowledge of mathematics, mechanics, and textile technologies within the range of forgoing study program.
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Assessment methods and criteria
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Oral exam
Credit: Active participation in practices and lectures, passing a test of knowledge during the semester. Exam: oral
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Recommended literature
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Soubor českých přednášek na https://elearning.tul.cz/..
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BEHERA, B. K., HARI, P. K., ed. Woven textile structure. Cambridge: Woodhead, 2010. ISBN 978-1-84569-514-9.
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HU, J. Structure and mechanics of woven fabrics. Cambridge: Woodhead Publishing, 2004. ISBN 0-8493-2826-8.
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NECKÁŘ. B., DAS. D. Theory of structure and mechanics of fiber assemblies. New Delhi: Woodhead Publishing India, 2012. ISBN 978-1-84569-791-4.
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NECKÁŘ. B., DAS. D. Theory of structure and mechanics of yarns. New Delhi: Woodhead Publishing India,, 2018.
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NECKÁŘ, B. Morfologie a strukturní mechanika obecných vlákenných útvarů.. Liberec: Technická univerzita v Liberci, 1989. ISBN 80-7083-318-1.
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NECKÁŘ, B. Příze. Tvorba, struktura, vlastnosti. Praha: SNTL Praha, 1990. ISBN 80-03-00213-3.
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