May 28, 2021 • Oxford, UK • 153 . SECTION XIV. TECHNOLOGIES OF LIGHT AND WOODWORKING INDUSTRY DOI 10.36074/logos-28.05.2021.v1.47 EFFECTS OF INFLUENCE FACTORS ON THE STRENGTH OF WARP YARNS Mamadalieva Dildora Abdumalikovna Researcher Namangan Institute of Engineering and Technology Alieva Dilbar Ganievna Docent Namangan Institute of Engineering and Technology REPUBLIC OF UZBEKISTAN Annotation: The resistance of yarn to deformation on a loom also depends in many respects on its shrinkage process. This article is about an analysis of a number of factors that affect the toughness of yarns when they are twisted. The article examines samples from loaded and unloaded yarns and analyzes the results. Today, one of the leading sectors of our national economy, the textile industry is developing dynamically. At the moment, demand is the production of products that are competitive and inexpensive, made from local raw materials that meet the needs of consumers. Sizing is one of the most important processes in the weaving preparation department. The reason is that, in the process of sizing the yarn is coated with a size paste, part of which is absorbed into the yarn, and glues individual fibers and elementary yarns. In the process of sizing, the yarn is under the influence of many physical and mechanical factors: the yarn is impregnated with the sizing; passes through the squeeze rolls, dries at high temperatures, the yarns stuck in the drying field are separated. These processes take place under tension until the yarn is wound from the warp beam onto the weaving beam, as a result of which the yarn is stretched. Such yarn processing affects their physical and mechanical properties [1-7]. Sizing is a process developed with the objective of improving the strength and abrasion resistance of the yarn. To achieve the objective, the yarns is coated with a paste known as size paste. The paste is prepared with different ingredients like preservatives, adhesive, softeners, base materials, etc. The improvement in strength and abrasive resistance is necessary for the yarn so that it can with stand the stresses and strains exerted during the weaving process [8-11]. By sizing the yarns, their abrasion resistance is increased by 5-10 times due to the paste coated on them, the tensile strength is increased by 25 percent, and the elongation at break is reduced by 14-28 percent. The increase in the weight of the yarn during the sizing process is called the amount of sizing.