In the textile industry, Polyester Yarn is widely used, from daily clothing to industrial fabrics. However, the quality of polyester yarn on the market is uneven, and how to identify its quality has become the focus of attention of consumers and manufacturers.
1. Appearance inspection
Color
High-quality polyester yarn has uniform color, bright but not dazzling. If the yarn color is dull, uneven, or has obvious color difference, it is likely to be a product of poor quality.
Hairiness
Observe whether there is too much hairiness on the surface of the yarn. Excessive hairiness will affect the strength and appearance of the yarn, and it is also easy to cause problems in the subsequent processing process. High-quality polyester yarn has less hairiness and a smooth surface.
Thickness uniformity
Observe the uniformity of the yarn with the naked eye. High-quality polyester yarn has consistent thickness and no obvious thickness changes. The yarn can be observed under the light, which makes it easier to find the problem of uneven thickness.
2. Physical property test
Strength
Strength is one of the important indicators to measure the quality of polyester yarn. The yarn can be tensile tested using a professional strength tester to determine its breaking strength and elongation. High-quality polyester yarn has high breaking strength and appropriate elongation, and can withstand large tensile forces without breaking.
Wear resistance
Abrasion resistance is also one of the important properties of polyester yarn. The yarn can be friction tested using an abrasion tester to observe the wear of the yarn. High-quality polyester yarn has good wear resistance and can maintain a good condition during long-term use and friction.
Shrinkage rate
After soaking the yarn in water for a period of time, measure the changes in its length and width, and calculate the shrinkage rate. High-quality polyester yarn has a low shrinkage rate and is not easy to deform during washing and use.
3. Chemical performance testing
Acid and alkali resistance
After soaking the yarn in acidic and alkaline solutions for a period of time, observe the changes in its color and strength. High-quality polyester yarn has good acid and alkali resistance and is not easy to discolor and damage in acid and alkali environments.
Anti-ultraviolet performance
After exposing the yarn to sunlight for a period of time, observe the changes in its color and strength. High-quality polyester yarn has good UV resistance and can remain stable for a long time in the sun.
4. Burning test
Burning phenomenon
Use a lighter to light the yarn and observe its burning phenomenon. High-quality polyester yarn has a smaller flame and a slower burning speed, and does not produce black smoke and pungent odor. The residue after burning is hard and brittle black particles.
Ash state
Observe the state of the ash after burning. The ashes of high-quality polyester yarn after burning are black particles, which will turn into powder with a light pinch of the hand. If the ashes are lumpy or sticky, it is likely to be a product of poor quality.
To identify the quality of polyester yarn, it is necessary to comprehensively consider the appearance, physical properties, chemical properties, combustion test, manufacturer and brand. Through the above methods of identification, consumers and manufacturers can choose high-quality polyester yarn, thereby improving the quality and competitiveness of products.