Spandex covered yarn is an elastic yarn formed by covering the elongated spandex yarn with the spandex yarn as the core, and wrapping the elongated spandex yarn with the filament or short fiber yarn in a spiral manner.
Classification of spandex covered yarn
1. According to the number of covering layers, it can be divided into single covering yarn and double covering yarn. Among them, nylon ammonia and polyester ammonia are mostly covered in a single covering method.
2. According to different equipment, it can be divided into two types: mechanically covered yarn and air covered yarn.
Features of spandex covered yarn
1. Air-covered yarn (abbreviated as empty package, English abbreviation as ACY) is drawn through a certain type of nozzle at the same time as the outer fiber filament and spandex yarn, and the rhythmic network points are formed by the regular spray pressure of high-compression air. yarn. The fabric feels soft and smooth;
2. Mechanically covered yarn (abbreviated as machine package, English abbreviation as SCY) is to continuously rotate the outer fiber filament and wind it on the core silk spandex that is drawn at a constant speed, and it has twist after twisting (abbreviated as TPM in English). ), the flat and crisp fabric style is its main feature.
Empty bales and machine baled yarns have their own advantages and disadvantages in weaving downstream weaving mills. When the empty bale is warped on the air-jet loom, sizing is generally required, otherwise the fabric is easy to fluff and break, but it can be used directly after beating up. From the perspective of cost alone, the production capacity of empty bales is much higher than that of machine bales, making the price lower than that of machine bales, which is convenient for reducing the cost of downstream weaving mills. Although the machine bag does not expose the core yarn, except for the uneven twist, it is not easy to produce quality problems during spinning and weaving, but the output is low, so the price is more than RMB5000/T higher than the empty bag of the same specification. The price is even more than RMB10000/T of the empty package of the same specification, which greatly increases the cost of using the package.
