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Lecturer(s)
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Moučková Eva, Ing. Ph.D.
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Jirásková Petra, Ing. Ph.D.
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Course content
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Lectures: 1. Repetition - basic yarn sorting according to construction and production possibilities. 2. The most important fiber parameters and properties in relation to yarn spinning technology and yarn properties. 3. Unevenness of linear textiles. Methods of expressing the mass unevenness. Productive and machine irregularity. 4. Measurement and evaluation of mass irregularity. Expression of the yarn mass irregularity in the area. 5. Quality of the carded sliver, the monitoring the carding process, adjustment of carding machine with regard to the quality of the resulting sliver. 6. -8.. Properties of the ring, compact, rotor and air-jet spun yarns, depending on the technological conditions of the spinning 9. Specifics of yarn production from chemical fibers, parameters of yarn for technical purposes and problems of its production. 10.-11. Construction of core yarns, production possibilities in spinning and twisting technology. 12. Construction of cabled threads. Options of production. Plying (twisting) multifilament yarns. 13. -14. Construction of fancy threads, production possibilities in spinning and twisting technology. Practices: 1. Introductory practice - safety rules. Repetition of the basic parameters of the yarn - count, number of twist, and possibility of their influence (draft ratio, delivery, respectively take-off speed). Yarn spinning technologies. Specimens of various yarn types. 2. Unevenness of linear textiles - calculation of machine and productive mass unevenness of linear fibrous assemblies. Analysis of report from measurement of irregularity. Evaluation of spectrogram. Project assignment No.1. 3.- 4. Realization of project No. 1 - Measurement and evaluation of the non-uniformity of yarns in the laboratory of Department of Technologies and Structures. 5. Excursion. 6. Spinning geometry of ring spinning machine, selected process variables and their influence on yarn properties. Project assignment No.2. 7.-9. Realization of project No. 2 - proposal of machine-technological parameters necessary for yarn spinning with different level of specified parameters, yarn spinning, and analysis of yarn properties with regard to yarn parameters. Realization in technology and structural laboratory of KTT. 10.-11. Project No. 3 and its realization - Production of spun yarns with different directions and different levels of twist and analysis of their influence on yarn properties - practical exercises in the KTT laboratory. 12. Possibilities of construction of twisted yarn using machine Direct Twist - practical exercises in the KTT lab. 13. Presentation of projects. 14. Final evaluation, possibilities of project repairs.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Self-study (text study, reading, problematic tasks, practical tasks, experiments, research, written assignments), Demonstration, Project teaching, Individual consultation, Lecture, Practicum, Students' portfolio
- Class attendance
- 56 hours per semester
- Individual project
- 15 hours per semester
- Preparation for formative assessments
- 15 hours per semester
- Presentation preparation (report)
- 5 hours per semester
- Home preparation for classes
- 15 hours per semester
- Fieldtrips
- 5 hours per semester
- Preparation for exam
- 40 hours per semester
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Learning outcomes
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Students will deepen their knowledge of the linear textiles from staple fibres in terms of their formation and properties with respect to the technological conditions of production. At the beginning of the course, the basic parameters of the fibres in relation to yarn spinning technology and yarn quality are mentioned. Students are further acquainted with the important properties of the linear textiles, namely the mass unevenness in terms of measurement and, above all, the evaluation in relation to yarn spinning technology. Within the course, the attention is also paid to the construction and properties of yarns spun by different spinning systems. The impact of the most important process variables of spinning systems on the yarn properties is analysed. Both twisted and fancy yarns are analysed in terms of their construction and production possibilities.
The student can specify the influence of selected machine-technology parameters of spinning machines on yarn properties. He understand the problems of mass unevenness in terms of its measurement and evaluation. He has a basic overview about the production of core, cable and fancy threads.
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Prerequisites
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Knowledge within the scope of the course Spinning.
KTT/PR
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Assessment methods and criteria
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Oral exam
Credit: Active participation in practices and lectures, passing the test of knowledge during the semester, elaboration and defense of projects. Exam: oral with written preparation
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Recommended literature
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GONG, R. H., WRIGHT, R. M. Fancy Yarn: Their Manufacture and Application. Cambridge: Woodhead Publishing Ltd., 2002. ISBN 0-8493-1550-6.
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LORD, P.R. Handbook of yarn production. 1st Edition. Woodhead Publishing, 2003. ISBN 978185736962.
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ROHLENA, V. a kol. Bezvřetenové předení. Praha, SNTL, 1974.
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THILAGAVATHI, G., KARTHIK, T. Process Control and Yarn Quality in Spinning. Woodhead Publishing India in Textiles, 2015. ISBN 978-9-380-30835-7.
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URSÍNY, P. Předení I., skriptum TUL, 2. vydání. Liberec: Technická univerzita v Liberci, 2006. ISBN 80 7272 077 9.
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URSÍNY, P. Předení II., skriptum TUL, 2.vydání. Liberec: Technická univerzita v Liberci, 2009. ISBN 978-80-7372-438-2.
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URSÍNY, P. Stroje a technologie dopřádání II. Skriptum VŠST, 1. vydání.. Liberec: Vysoká škola strojní a textilní v Liberci, 1984.
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