COMPARATIVE EVALUATION OF COTTON FIBER QUALITY UNDER DIFFERENT COTTON GINNING TECHNOLOGIES

Abstract

Cotton fiber quality plays a decisive role in determining spinning performance, yarn properties, and the overall competitiveness of textile products. During primary cotton processing, technological operations such as coarse cleaning, fine cleaning, aspiration, moisture conditioning, ginning, and lint cleaning may improve fiber cleanliness while simultaneously causing fiber damage if operating parameters are not properly optimized. Therefore, selecting an appropriate cotton ginning technology is essential for maintaining high fiber quality and increasing the economic value of cotton.

This research presents a comparative methodology for evaluating the influence of four different cotton ginning technologies—Uzbek (local), Chinese, Indian, and American—on the quality characteristics of cotton fiber. The study focuses on identifying technological factors that affect fiber quality throughout the primary processing sequence and determining the processing technology that provides the best balance between cleaning efficiency and fiber preservation.

Field investigations are carried out at four cotton ginning plants operating with different technological systems. At each facility, observations begin at the raw cotton receiving section, where weighing procedures, sampling techniques, laboratory inspection methods, and primary quality assessment are carefully examined. The technological equipment used at each processing stage is documented and compared according to its operating principles and processing capacity.

To ensure objective evaluation, an experimental comparison method is developed. Raw cotton samples collected from each plant are divided into two groups. The first group is manually cleaned by carefully removing coarse foreign materials such as stems, leaves, bark, stones, and other impurities without damaging the fibers. These manually cleaned samples serve as the control group. The second group is processed using the industrial cleaning equipment under standard factory operating conditions. Fiber samples obtained from both groups are analyzed using the High Volume Instrument (HVI) system under standardized laboratory conditions.

The comparative assessment is conducted after each major processing stage, including coarse cleaning, fine cleaning, aspiration, moisture conditioning, ginning, and lint cleaning. The principal fiber quality indicators include upper half mean length (UHML), fiber strength, micronaire, uniformity index, short fiber index (SFI), color parameters (Rd and +b), elongation, maturity, and trash content. Statistical analyses including descriptive statistics, analysis of variance (ANOVA), and correlation analysis are used to evaluate significant differences among technologies.

The proposed methodology provides a scientific framework for comparing modern cotton ginning technologies and identifying technological operations that have the greatest influence on fiber quality. The findings are expected to contribute to the optimization of cotton processing systems, reduction of fiber damage, improvement of export-quality cotton production, and enhancement of spinning efficiency in the textile industry.