Yarn is both a product of spinning mills and a raw material for weaving mills. At present, the country vigorously advocates supply-side structural reform, strengthening high-quality supply from the production field, reducing ineffective supply, expanding effective supply, and making the supply system better adapt to changes in demand structure. So how do we know what products users need and who is producing these high-quality products? What kind of yarn is a high-quality and effective product? Here we will talk about the various quality requirements of yarns for yarn-dyed fabrics.
As a high-end fabric with various colors and structures, yarn-dyed fabrics have high requirements for yarn products. The quality of yarn directly affects warping and weaving end-breaking. In terms of efficiency, weaving efficiency and the quality of the final product, the yarn requirements for yarn-dyed fabrics are usually higher than those for ordinary printing and dyeing fabrics.
1 Requirements for yarn defects in yarn-dyed fabrics
In national standards The length of a 1-point defect is 0.3-8CM, while the length of a 1-point defect in the international standard is less than 7.62CM, which is 3 inches. Different standards vary greatly. Controlling yarn defects is not just about controlling standard yarn defects. Most yarn-dyed fabric companies in my country also control small and medium yarn defects as main indicators.
2 Requirements for neps of yarn-dyed fabrics
Yam-dyed fabrics Cloth companies not only focus on +200% neps, but also on the number of +140% neps. For example, good quality 40-count yarn-dyed yarn +200% neps can reach 10 neps/1000 meters, and +140% neps can reach 150 neps/ Below 1000 meters. Of course, different fabrics have different requirements for neps. For example, general plaid fabric requires +140% neps <400 neps/1000 meters, +200% neps <70 neps/1000 meters, while high-end plaid fabric requires +140 neps. % neps <150 grains/1000 meters, +200% neps <20 grains/1000 meters, and the requirements for chambray or striped cloth are in the middle.
3 Requirements for yarn evenness of yarn-dyed shirt fabrics
Usually, the evenness CV% of yarn used for yarn-dyed yarns must be better than the 25% level specified in the Uster Gazette in order to meet the fabric quality requirements. At the same time, yarn-dyed fabrics have particularly strict requirements on raw yarns that are regularly evened due to mechanical reasons. In particular, regular evened yarns caused by failures of the top rollers and front rollers of the spun yarns are very harmful to the fabric surface.
4 Requirements for yarn-dyed shirt fabrics for fibers of the opposite sex
Opposite sex Fiber is a difficult problem in spinning mills. When yarn-dyed weaving mills use yarn spun from fine velvet cotton, sometimes there are up to 30-40 foreign fibers per 10 meters. Although foreign fiber removal devices have been added to the spinning blowroom and winding processes, there are often many foreign fibers on the fabric. According to the scoring regulations for cloth surface defects, it still fails to meet the customer’s requirements. Yarn-dyed factories have to organize a lot of labor to repair foreign fibers on fabrics. Therefore, for yarn-dyed yarns, the fewer foreign fibers the better.
5 Requirements for hairiness of yarn-dyed fabrics
Hairiness in color It plays a vital role in weaving quality control. First of all, since the warp and weft yarns of yarn-dyed fabrics are all dyed, the process is long. During the rewinding and dyeing process, the hairiness increases a lot, which can easily cause the hairiness to gather into thick spots, affecting the quality of the fabric and even causing the fabric to degrade. etc.; secondly, uneven hairiness can easily cause different shades of color; finally, yarn hairiness will be too much, which will affect the pilling properties of the fabric.
6 Requirements for single yarn strength of yarn-dyed fabrics
Usually The strength of yarn used in yarn-dyed fabrics reaches 25% of USTER level, which can basically meet the needs of yarn used in weaving. As for some special finishing yarns, they need to be produced with special raw cotton. In addition, when using yarn in daily life, yarn-dyed mills also pay special attention to the minimum strength. Just like the principle of short wooden barrel, the quality of a batch of yarn does not depend on the best quality yarn, but on the worst quality yarn. Therefore, in daily production management, spinning mills should pay special attention to the minimum strength and eliminate backward spindles.
The above has introduced several main indicators of yarn used in yarn-dyed fabrics. The quality indicators not mentioned, such as thick knots, details, and twist, are also of concern to the yarn-dyed fabrics. focus. Maintaining stable yarn product quality and consistently controlling yarn quality are important prerequisites for producing excellent yarn-dyed fabric products. </p
