The main solution to this problem is the modernization of the composite feed cylinders of rotor spinning machines, which would reduce costs and increase the competitiveness of yarn in terms of cost and quality indicators of yarn, as well as create prospects for the development of new models of feed cylinders, which are used in the feed zones of rotor spinning machines. The goal and objective of the research is to conduct an experiment using a new design and the proposed chevron-type feed cylinder and develop scientifically based technical and technological solutions that ensure improved yarn quality indicators. In experimental studies, methods of planning, analysis, and optimization of experiments were used; correlation and variance analyses; mathematical statistics, textile materials science. Mathematical dependences of the influence of the parameters of the proposed chevron-type feed cylinder in the feed zones of a rotor spinning machine on the specific breaking load of the thread, the coefficient of variation in breaking load, the coefficient of variation in uneven linear density and the number of neps in the yarn were obtained.

In the article, in today’s developing period, instead of obvious bloody wars all over the world, there are economic crimes that increasingly threaten security, stability and the political, cultural and spiritual spheres of every society, the discovery of these crimes, the perpetrators, property and moral property practical recommendations are given on the evidence that is important in determining the damage.

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