About Yarn Properties Testing
Introduction to Textile Testing: • Objectives of testing; Selection of samples for testing; Sampling Techniques • Sampling methods for yarns Atmospheric conditions for testing: • Moisture regain and content of textile fibers; Moisture testing and drying ovens • Electrical and capacitance methods for measuring moisture Fiber Length, Fineness and Maturity Testing: • Different methods of fibre length measurements; Fibre length measuring instruments • Different methods of fibre fineness measurements; Fibre fineness measuring instruments • Limitations of the instruments and interpretation of the results obtained from the fineness instruments • Maturity testing; Caustic soda method of maturity test; Differential dyeing • Polarized light method of maturity test Trash Testing • Shirley trash analyzer Yarn count Testing • Direct and Indirect systems of count testing; Conversion factors; Length Measurement; • Mass measurement; Doubled yarns; Yarn count and diameter Twist and twist measurement • Measurement of twist; Straightened fiber method; Continuous twist tester; Twist contraction method; • Twist to break method; Twist measurement by microscope; Take-up twist tester Tensile testing: • Factors affecting tensile properties; Principles employed in tensile testing of fibers and yarns • C.R.L. and C.R.E. principles; Pendulum Lever, Inclined plane, and Strain-gauge principles • Fiber strength testing; Yarn strength testing Yarn Evenness Testing: