Stanislav Pracek
Vibrations in yarn, which appear when the yarn is unwinding from a package, cause many problems and can degrade the efficiency of the textile process and the quality of the end product. These vibrations in yarn are particularly strong in axial unwinding, where the package is stationary and the yarn is being withdrawn in the direction of package axis. It is thus important to find the optimum shape of the package for which the motion of the yarn will be such that vibrations in yarn will be small and as steady as possible. The unwinding will be discussed from a theoretical point of view. We will formulate the equations that describe the motion of yarn during unwinding and to construct the mathematical model which can be used to simulate the entire process of unwinding on a computer.
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