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.

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.