Unit ii
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This document discusses various methods for testing the strength and quality of yarns, including single yarn strength testers, lea strength testers, and Instron testers. It also addresses methods for measuring yarn evenness, such as with yarn appearance boards, electronic capacitance testers, and Uster evenness testers. Finally, it covers classifications of yarn faults according to the Uster Classimat tester. Key topics include tensile testing principles, factors that influence yarn strength and evenness, definitions of various testing metrics, advantages and disadvantages of different testers, and analyzing periodic variations using spectrograms.
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Unit ii
- 1. 08 FT 506 TESTING AND QUALITY CONTROL OF TEXTILES AND APPAREL UNIT II YARN TESTING II: Yarn strength - Single yarn and lea strength testers. Classification of variations in yarn - methods of measuring yarn evenness – yarn appearance board - ASTM standards - electronic capacitance - Uster evenness tester - yarn faults classification - Uster Classimat Two Marks: 1. What are the characteristics influence the fibre strength of yarns? 2. What are the factors affecting the tensile properties of textiles? 3. What are the principles used for tensile strength of the yarns? 4. Define the term CRL? 5. Comparison between CRL and CRE? 6. Define the term CRT? 7. Which Principles is used for single yarn strength and lea strength tester? 8. What do you mean by Tenacity of the yarn? How it can be calculated? 9. What do you mean by Elongation% of the yarn? 10.What are the advantages of uster single yarn strength over single yarn strength tester? 11.Define strain gauge principle used for instron tester? 12.What are the drawbacks of lea strength tester? 13.Define CSP (or) Break factor of the yarn? 14.Define the term corrected CSP of the yarn? 15.What are the advantages of lea strength tester over single yarn strength tester? 16.Define the term work of rupture? 17.What are the advantages of ballistic tester over lea strength tester? 18.Comparison of single thread strength, lea strength and work of rupture? 19.What are the properties influence the evenness of the yarns? 20.What are the classifications of variations in yarns? 21.Define Random and Periodic variations? 22.What do you mean by P.M.D and coefficient of variations in yarns?
- 2. 23.Define the term Basic irregularity? 24.What do you mean by Index of irregularity? 25.What are the methods of measuring evenness of yarns? 26. What do you mean by Electronic capacitance testers? 27.Define the term U% of the roving and Yarns? 28.What do you mean by spectrogram (or) periodic irregularity spectrum? 29.What are the causes of periodic variations and irregularity in yarns? 30.What are the classifications of yarn faults according to uster classimatt faults? BIG QUESTIONS: 1) Explain in detail about the working principles of single yarn strength tester? 2) Explain in detail about the Instron tester? What are the advantages of instron tester over Single yarn strength tester? 3) Explain the working principles of lea strength tester and give its advantages and disadvantages? 4) Explain in detail about the measurement of lea strength using Ballistic Tester? 5) Explain in detail about the measurement of yarn evenness tester using yarn appearance board and comparison of yarn appearance board using ASTM standards? 6) Explain the working principle of electronic capacitance method using uster evenness tester and also analysis the periodic variations using spectrogram? 7) Explain in detail about the classifications of yarn faults using Uster classimatt tester?