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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. Classification of basic processes and spinning systems in staple spun yarn production technology. 2. Analysis of processes: opening, cleaning and mixing in spinning technology. 3. Ensuring the mass evenness of fibrous assembly. Theory of mass unevenness in spinning technology. Basic classification of autolevelers and their application in yarn manufacturing technology. 4. Laws of transformation of mass irregularity. 5. Analysis of carding system. 6. Analysis of the drawing process (field of friction force, ideal draft, drafting force). Concepts of drafting devices used in yarn manufacturing technology. 7. Combing system - analysis of the combing cycle at the cotton and worsted combing machine, the theory of noils. 8. The theory of formation of fibrous product on the tow-to-top converter 9. Strengthening - rules for twist formation. The theory of false twist formation and its use in yarn production technology. 10. Analysis of the flyer roving forming system, the process of twisting and winding on the flyer frame. 11. Analysis of the ring spinning system, the process of twisting and winding on ring spinning machine. Compact spinning. 12. Analysis of the open-end rotor spinning system. Analysis of major technological processes. 13. Analysis of the air-jet spinning system. 14. Analysis of plying systems. Practices: 1. Introductory exercise - rules for safety of work. Examples of linear fibrous assemblies as output products of individual spinning systems and their basic characteristics. Repetition of the classification of the basic spinning technologies. 2. Examples of the practical realization of opening, cleaning and mixing systems. Calculation of the opening ratio. Efficiency of cleaning. 3. Calculations concerning the yarn mass unevenness, analysis of selected characteristic functions of mass unevenness. 4. Determination of the modulus of the relative transfer function of the drafting device and its interpretation. Assignment of project No. 1. 5. Realization of project work No. 1 - Determination of the experimental modulus of the relative transfer function - realization in the technological and structural laboratory of the Department of Technologies and Structures. 6. Carding system - calculations of selected characteristics for carding, card clothing, and processed material. Graphic decomposition of forces in the carding, doffing, and tripping disposition. Demonstration of the carding system in the technological laboratory of KTT. 7. - 8. Excursion 9. Assignment of the project No. 2 - Influence of draft ratio and spindle speed on properties of produced yarn. Ring spinning system - Analysis of tensile forces in yarn during winding on an ring spinning machine. 10. Realization and elaboration of project No. 2 in the technological and structural laboratories of KTT. 11. Rotor spinning system. Assignment of the project No. 3 - Back doubling versus rotor diameter in relation to yarn mass irregularity. 12. Realization of project No. 3 - practical analysis in the technological and structural laboratories. 13. Practical demonstrations of plying and cabling systems - technological laboratories of KTT 14. Presentation of projects. Final evaluation.
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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, Laboratory work, Lecture, Practicum
- Class attendance
- 56 hours per semester
- Presentation preparation (report)
- 25 hours per semester
- Preparation for credit
- 15 hours per semester
- Preparation for exam
- 45 hours per semester
- Home preparation for classes
- 20 hours per semester
- Fieldtrips
- 10 hours per semester
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Learning outcomes
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Within the subject individual spinning processes (opening, cleaning, mixing, elimination of short fibers, drawing, twisting, winding, ensuring mass evenness) are analyzed both in the theoretical and practical level. Attention is also focused on individual spinning systems (carding, combing, roving forming, spinning and plying) used in yarn spinning technology. The theory of formation of converter top is mentioned. Students are also deeply acquainted with the laws of transformation of mass unevenness.
The student has an overview of basic spinning processes and systems. He has knowledge of a theoretical basis relating individual spinning processes.
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Prerequisites
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Knowledge of mathematics and mechanics. Overview of fiber raw materials.
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Assessment methods and criteria
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Combined examination, Presentation of group work
Direct teaching: Credit: Active participation in seminars and lectures, passing the test of knowledge during the semester, elaboration and defense of projects. Exam: oral Online teaching: Credit: submission of all assigned tasks (and, if required, corrections of tasks) within self-study for exercises, submission of assigned and correctly prepared semester work until the date of end of teaching in the summer semester given by the Teaching Schedule. After this date these works will not be accepted and the student must register the subject next year. Exam: oral
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Recommended literature
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Webové stránky světoznámých výrobců přádelnických strojů (http://www.rieter.com/ ; https://www.truetzschler.com/en/ ; http://www.befama.com.pl./ ; http://www.marzoli.it/it/camozzigroup/textile-machinery/marzoli/home ; http://www.nsc-schlumberger.com/ ; http://andar.co.nz/textiles/ ; http://www.muratec-vortex.com/ ; http://www.schlafhorst.de/en/schlafhorst/ ; www.cognetex.com).
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URSÍNY, P. Předení I. 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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