Multi-variety production, yarns with different counts, yarns with different technological processes and processing methods, and yarns with different uses. The purpose of cotton blending is to use raw cotton more reasonably, because the quality and characteristics of yarns are endless The same, plus the spinning process has its own characteristics, therefore, the quality requirements of raw yarns for various yarns are different.
1. Different count yarns
High count yarns generally refer to more than 50 yarns, which are generally used in high-end products. They require high yarn strength, few appearance defects, uniform dryness, high yarn counts with smaller wire diameters, and the number of fibers contained in the cross section Fewer defects, easy exposure, and uneven fiber distribution in the cross section, which has a greater impact on the level of cotton yarn sliver. On the other hand, the requirements for low count yarns are relatively low. Therefore, different grades should be selected according to different counts during cotton distribution Different quality raw cotton.
2.Combed and Carded Yarn
Combed yarn is generally a high-grade product, which requires good appearance, uniform dryness, and less neps impurities. The combing process can largely eliminate short fibers and some impurity defects, and it is difficult to eliminate neps. Therefore, the combed cotton requires that the raw cotton linters and neps should be as low as possible, the maturity is too poor, and the tax rate is too high. Generate neps, use as little as possible. Because combed products are used to make high-grade fabrics, the dyeing effect on the cloth surface is relatively high. Therefore, raw cotton with good color and uniformity, and sometimes long-staple cotton are also required.
3.Single yarn and strand
Generally, the single yarn is twisted in the backhand direction, and the strand is twisted in the forward direction. The angle between the fibers in the strand and the spool is small, so the fiber utilization rate is high, the strength is greatly enhanced, and the dryness is improved. The level can be increased by 2% to 3%. Since most hairiness and defects are wrapped in the wire, which reduces the chance of exposure to the yarn, the number of hairiness and defects is also greatly improved. The use of strands is generally multi-purpose and warp yarns, so the grade and quality of cotton can be reduced.
4.Warp and weft
Warp yarns are subject to more tension and friction opportunities during use, so the warp yarns have higher strength requirements. When arranging cotton, you should choose slender fibers, single fibers with high strength, moderate maturity, and good uniformity. In the weaving process, there are many opportunities for removing neps and impurities on the yarn, and it also needs to go through the sizing process. Therefore, the color and impurities of the raw cotton are relatively low. The weft yarn is not sizing. The preparation process is simple. The chance of removing impurities is small. Mostly exposed on the fabric surface, so weft yarns have a greater impact on the fabric's color, appearance, feel and other factors, but weft yarns do not require high strength, so you can choose raw cotton with good color, less impurities, thicker and shorter tension.
5.Knitting yarn
Knitwear is knitted with a single or several yarns on a knitting machine. It requires high yarn breakage, defects, strength, and dyeing effects. Knitting yarns are generally used in underwear and require softness and comfort. The twist is small, the knitting yarns have high requirements on the uniformity of the stripe, and the uneven thickness of the yarn is particularly obvious on the fabric. Therefore, when the cotton is blended, the yarn is strong, dry, defective, and the number of ends is required. Taking care, you should choose raw cotton with slender fibers, good neatness, normal maturity, low fluff rate, and low defects. Knitting yarns for fleece fabrics should choose raw cotton with good maturity, good elasticity and short length. .
6.Dyeing yarn
Generally, cotton fabrics are subjected to post-finishing and dyeing processing. The color absorption capacity of fabrics has a great relationship with the properties of fibers. Light-colored fabrics do not require high raw cotton, but they cannot use raw cotton with low maturity coefficient and large differences, otherwise It will cause uneven mixing of fibers, and spots or stripes will appear after dyeing the fabric. Therefore, light-colored cloth requires raw cotton with less impurities and better color. Dark fabrics have high requirements for fiber color absorption, and raw cotton with good maturity. Printed cottons can have lower requirements for raw cotton, because after printing, some cotton defects and crossbars on cotton can be covered. For yarn-dyed yarns, requirements The highest one-color cloth fabric yarn, one-color cloth is also known as Miton cloth, is the use of dyed yarns to weave high-end decorative or apparel fabrics. Because the yarn is dyed in multiple processes during the dyeing process, the yarn is required to have no hairiness, no yarn defects, and no joints. At present, there are fewer yarns that can reach high-grade one-color cloth yarns in China.
7, special yarn
There are many types of special yarns, such as cords for tires, high-end sewing threads, yarns for decorative fabrics, and yarns for handkerchiefs. When choosing cotton, specific selection should be made according to quality requirements, and it should not cause a universal cotton matching phenomenon.
In the yarn purchase contract, in addition to requiring the mill to order the spinning according to the purpose of the yarn, many orders also require specific quality and technical indicators of the yarn, such as dry CV value, yarn knots, etc., and the quality of the cotton yarn. In addition to being related to production management, process conditions, mechanical conditions, operating levels, etc., it has a lot to do with the quality of the raw cotton used and the reasonable use of it. Therefore, grasp the different requirements of raw cotton on the quality of the yarn and the relationship between them. The interrelationships give full play to the technical performance of the raw materials. Under the condition that the cost of cotton distribution is relatively low, improving the quality of the yarn, stabilizing the production, and reducing the production cost have an important role.