This is a very practical and good question. If you don't have an instrument, you can try the following 5 steps:
1. First observe the surface to see if there are any impurities, oil stains, rust stains, slugs, different-colored fibers, neps, etc.; 2. Pull out the yarn for a distance to see if the strips (fat), dry (thin), etc. are even; 3. Pull hard. , to feel whether it has toughness; 4. The above 3 points are all ok, you can use the loom to proof it to see whether it is easy to weave and the overall quality of the cloth; 5. At the same time, cut a section of yarn, stir it with warm water and a little laundry detergent, Simply test the color fastness. The above simple steps involve five important indicators of yarn quality: yarn defects, evenness, strength, twist, and color fastness. The five points complement each other to determine the quality level of the yarn. The following content is expanded, and I hope it will be useful to you. 1. Yarn defects Yarn defects refer to defects in the yarn that will affect the appearance and flatness, such as thick details, colored yarns, slugs, impurities, oily yarns, rust stains, etc. Yarn defects can be measured with a yarn defect meter.
2. Sleekness Sleekness refers to the degree to which the thickness of the yarn is uniform. The thickness of yarns with the same count should be uniform in theory. However, during the spinning process, if the operation is improper and the craftsmanship is not meticulous, yarns with uneven thickness will be produced, resulting in the finished product showing clouds of different shades. spot.
3. The strength of strong yarn refers to the toughness of a yarn and its fastness. In spinning, the raw materials must withstand certain tension and load, and the spun yarn must have a certain strength to ensure the normal progress of the weaving process. The strength of the yarn can be measured with a single yarn strength machine, which is generally expressed in terms of breaking strength (the force used when the yarn is broken on the strength machine, the unit is CN/tex (gf/tex).
4. Twist plays a key role in the slubbing process. On the spindle machine, the yarn is drafted and twisted at the same time. The purpose of twisting is to make the yarn have better strength. Twisting is like winding a yarn, controlling whether it is tight or loose. Over-twisting High, the yarn is twisted and braided during weaving, the elasticity of the fabric is reduced, and small braided yarn knot defects are easily formed on the surface of the fabric. In addition, too many yarn knots can easily damage the parts of the loom. Too low a twist will affect the yarn Due to the strength of the thread, the breakage rate increases, and the workers who stop the car have to keep knotting, the yarn production rate is low, and the output is reduced; too many knots on the fabric will also affect the appearance quality of the knitted products. The twist of the yarn can be measured by the twist meter Measure it out.
5. Color fastness means dyeing fastness, which means that the dyed yarn is subjected to external washing, ironing, friction, light, saliva immersion, water stains, sweat stains, chemicals, etc. during use or processing. The degree of fading is a routine test item in yarn quality testing. Dark colors, light colors, bright colors, fluorescent colors, interlaced colors and other colors need to maintain a certain degree of fastness in order to meet the needs of wear and durability. The color fastness of the yarn can be sent to the testing department for testing of various color fastness indicators.
