 Information Package / Course Catalogue
Yarn Irregularity Calculations
 Course Code : TTİ222 Course Type : Area Elective Couse Group : Short Cycle (Associate's Degree) Education Language : Turkish Work Placement : N/A
 Theory : 2 Prt. : 0 Credit : 2 Lab : 0 ECTS : 3
Objectives of the Course

To understand the definition and importance of irregularity. To teach the interaction of fiber properties and yarn properties. To comprehend theoretical inequality equations. Comprehend the use of limit unevenness and irregularity index. To teach methods of unevenness measurement. To comprehend the interpretation of data obtained from unevenness measurement systems. To understand the reasons of periodic mass changes. Diagram and spectrogram to teach evaluation. To understand the methods of finding periodic sources of mass change. To provide recognition of various mechanical error sources in digram and spectrogram.

Course Content

Definition and importance of irregularity. Relationships between fiber and yarn properties. Theoretically descending of irregularity. Limit unevenness. Uniformity index value. liimite Separation of irregularity into components. Uniformity measurement methods. Investigation of capacitive and optical irregularity measurement methods. Information provided by devices of irregularity. Diagram and its importance. Spectrogram and its importance. Faultless and incorrect spectrogram analysis. Error sources and error detection. Mechanical errors and calculation methods. Shooting fluctuations and calculation methods. Investigation of the effects of periodic mass changes on the diagram and spectroscopy. Investigation of rare irregularities.

Name of Lecturer(s)
Learning Outcomes
 1 To comprehend the importance and importance of the uniform. 2 To be able to use theoretical uniformity equations. 3 To know the methods of unevenness measurement and to grasp the differences between them. 4 To analyze the data received from unevenness devices. 5 To determine the reasons and sources of periodic mass changes.
 1 USTA, Ismail; Uniformity Calculations, Lecture Notes, Marmara University, Faculty of Technology, Textile Engineering Department, Istanbul, 2012
Weekly Detailed Course Contents
Week 1 - Theoretical
General introduction. Definition and importance of irregularity. % U and% CV calculations
Week 2 - Theoretical
Causes of irregularity in yarns. Raw material properties. Yarn Properties. Machine parameters. - Raw material properties - Yarn properties - Machine properties
Week 3 - Theoretical
Theoretical irregularity analysis. Fiber fineness irregularity. Fiber length unevenness relationship. Yarn number irregularity.
Week 4 - Theoretical
Properties of% U and% CV. Additional irregularities.
Week 5 - Theoretical
Theoretical explanation and calculation of limit unevenness. Number and importance of fiber in cross section of yarns.
Week 6 - Theoretical
Uniformity index and its use. unevenness and theoretical calculation of blended yarns
Week 7 - Theoretical
Analysis of irregularity in components. Statistical analysis methods of measurement values
Week 8 - Theoretical
Midterm
Week 9 - Theoretical
Uniformity measurement methods. Capacitive methods and applications. Information provided by devices of irregularity.
Week 10 - Theoretical
Periodic irregularities and their causes. Ideal spectrograms. incorrect spectrograms.
Week 11 - Theoretical
Types of thread error. Mechanical errors. Shooting fluctuations.
Week 12 - Theoretical
Calculation of periodic mass changes. Calculation methods. Tachometer method. Sample calculations.
Week 13 - Theoretical
Machine kinematic schema using and calculations. Sample calculations.
Week 14 - Theoretical
Analysis of yarn periodic error sources in diagrams and spectrograms. error groupings
Assessment Methods and Criteria
Type of AssessmentCountPercent
Midterm Examination1%40
Final Examination1%60