PHYSICAL-CHEMICAL COMPOSITION OF REGENERATED NONWOVEN FABRIC FIBERS AND RESEARCH ON THEIR PROCESSING

PHYSICAL-CHEMICAL COMPOSITION OF REGENERATED NONWOVEN FABRIC FIBERS AND RESEARCH ON THEIR PROCESSING Akramjanov Dilmurod Muxtorjon o‘g‘li, Senior Lecturer, Department of Technological Machines and Equipment, Namangan State Technical University, Uzbekistan akramjanovd@gmail.com Abdulazizov Rahmatulla Isroil o‘g‘li Bachelor Student, Department of Technological Machines and Equipment, Namangan State Technical University, Uzbekistan https://doi.org/10.5281/zenodo.18753250 Abstract – This article scientifically investigates the approaches and methods for producing nonwoven fabrics for technical applications from secondary raw materials. Keywords – function, raw material, nonwoven fabric, heat, thermal conductivity, thermal properties, physical properties, technology, quality. Introduction Nonwoven materials are widely used in modern industry, particularly in technical, medical, and construction sectors. Their main properties depend on the physical and chemical composition of the fibers and the processing technology applied to them. This section analyzes the molecular composition of fibers, their structural and mechanical properties, thermal behavior, hygroscopicity, and level of chemical resistance. General Description of the Physical-Chemical Composition Nonwoven fabrics are manufactured from various types of polymer-based fibers. These include the following: Natural fibers: cotton, flax, kapok, jute. Synthetic fibers: polyester (PET), polypropylene (PP), polyamide (PA), viscose, and others. Secondary (recycled) fibers: blended fibers recovered from clothing waste or industrial waste. The physical properties of these fibers—density, tensile strength, flexibility, degree of hygroscopicity, and thermal stability—determine their potential applications. Molecular Structure of Fibers and Its Influence on Fabric Properties The physical and chemical composition directly affects the properties of the fabric: Polymer chain length: Longer chains result in higher fiber strength and greater thermal resistance. Degree of crystallinity: In many cases, synthetic fibers exhibit a high degree of crystallinity, which enhances their resistance to deformation.