What is the difference between nylon spandex empty bag and machine-covered spandex yarn?

Air-covered yarn (abbreviated as air bag, English abbreviation ACY) is a yarn in which the outer fiber filament and spandex yarn are drawn together through a certain type of nozzle, and the regular pressure of high-compression air is sprayed to form a rhythmic network point. . The fabric feels soft and smooth;

Mechanically covered yarn (abbreviated as machine bag, English abbreviated as SCY) is the continuous rotation of the outer fiber filament and wraps it around the core spandex that is drawn at a constant speed. It is twisted and has a twist (English abbreviation is TPM) , The fabric style is flat and crisp is its main feature.

Covered Spandex Yarn (Covered Spandex Yarn) generally has single-wrap, double-wrap and other covering forms. In the meantime, the nylon and polyester ammonia are mostly coated in a single package.

There are advantages and disadvantages to the weaving of air-packed yarns in downstream weaving factories. When the empty bag is warped on the air-jet loom, sizing is generally required, otherwise the fabric is easy to be fluffed and broken, but the beating can be used directly. Considering the cost alone, the empty bag capacity is large, higher than the machine bag capacity, which makes the price lower than the machine bag, which is convenient for reducing the cost of downstream weaving factories. Although the machine package does not reveal the core yarn, it is not easy to produce quality problems during spinning and weaving except for uneven twist, but the output value is low, and the price is higher than the standard empty package. The price is more than RMB5000/T. The price of fine denier covered yarn The empty package is more than RMB10000/T above the same standard, which greatly increases the cost of using the package.