In the production of knitted fabrics, yarn breakage is a significant cause of defects. These defects not only affect the appearance of the knitted fabrics but can also reduce their physical properties, thus impacting subsequent processing efficiency and finished product quality. To effectively reduce defects caused by yarn breakage, a comprehensive approach is needed, encompassing raw material selection, process optimization, equipment maintenance, operational standards, and environmental control.
Raw material selection is fundamental to reducing yarn breakage. High-quality fibers with high single-fiber strength, low short fiber content, good length uniformity, and low impurity content should be prioritized. Such fibers can form tightly structured, uniformly strong yarns during spinning, thereby reducing the risk of breakage. Simultaneously, rationally controlling the blending ratio to avoid uneven yarn formation due to excessive performance differences between different fibers is also an important means of reducing breakage.
Process optimization is key to reducing yarn breakage. In each spinning step, process parameters should be rationally set according to the characteristics of the raw materials and the yarn requirements. For example, the carding process should follow the principles of "gentle opening, thorough mixing, early removal, less breakage, more rows, less damage" to reduce fiber damage and impurity content; the combing process must strictly control the configuration of carding elements and the carding intensity to effectively remove short fibers and fine impurities; the coarsening process needs to rationally allocate the draft ratio to improve fiber straightening and parallelism; and the spinning process should adopt the process principle of "moderate pressure, reasonable control, and a tighter grip at the beginning and looser grip at the end" to improve yarn evenness and strength.
Equipment maintenance is equally crucial for reducing yarn breakage. The operating condition of spinning equipment directly affects yarn quality. Regular inspection and maintenance of the equipment should be carried out to ensure that all parts operate flexibly, without wear, and without looseness. In particular, the condition of key components such as the drafting system, pressure mechanism, and winding device directly affects the yarn evenness and strength. In addition, worn rubber rollers, rubber rings, and other specialized equipment should be regularly inspected and replaced to reduce yarn breakage caused by equipment defects. Operating procedures are a crucial element in reducing yarn breakage. The skill level and operating habits of operators directly impact yarn quality. Therefore, it is essential to strengthen the training and management of operators, improving their quality awareness and operational skills. Operators must strictly adhere to operating procedures, ensuring daily cleaning and maintenance of equipment, promptly removing fly shavings, accumulated dust, and other impurities to prevent them from adhering to the yarn or equipment and causing breakage. Simultaneously, regular inspections should be strengthened to promptly identify and address abnormalities such as yarn breaks, preventing the expansion and spread of defects.
Environmental control is also a vital factor in reducing yarn breakage. Temperature, humidity, and other environmental conditions within the spinning workshop significantly affect yarn performance. Based on raw material characteristics and process requirements, workshop temperature and humidity conditions should be rationally controlled to avoid problems such as static electricity and adhesion caused by unsuitable environments. Furthermore, maintaining cleanliness and hygiene in the workshop is essential to reduce the generation and accumulation of dust and fly shavings, creating a favorable environment for yarn production.
