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Both mechanical covered yarn and air covered yarn belong to core-spun yarn. Core-spun yarn is generally made of synthetic fiber filaments with good strength and elasticity as core filaments, and spun yarns made of cotton, wool, viscose and other short fibers twisted together. The core-spun yarn has the excellent properties of the filament core yarn and the outer staple fiber. The more common core-spun yarn is polyester-cotton core-spun yarn, which uses polyester filament as the core yarn and is outsourced with cotton fiber. There is also spandex core-spun yarn, which is a yarn made of spandex filament as the core yarn and other fibers. The knitted fabric or jeans material made of this core-spun yarn stretches freely and fits comfortably when worn.

Brocade bag is nylon core-spun yarn.

Air-covered yarn (referred to as empty bag, abbreviated as ACY in English) is a yarn that forms rhythmic network points by drawing the outer fiber filament and spandex filament at the same time through a certain type of nozzle and regularly spraying pressure of highly compressed air. Its fabric feel soft and smooth;

Mechanical coated yarn (abbreviated as machine bag, abbreviated as SCY) is to continuously rotate and wind the coated fiber filament on the core fiber spandex drawn at a uniform speed. It is twisted and has twist (abbreviated as TPM). The fabric style is flat and stiff, which is its main feature.

Air charter machine package yarn weaving in the downstream weaving factory has its own advantages and disadvantages. When the empty bag is warped on the air-jet loom, it usually needs sizing, otherwise the fabric is easy to fluff and break the silk, but it can be used directly by beating up. Considering the cost alone, the empty package capacity is much higher than the machine package capacity, making the price lower than the machine package, which is convenient to reduce the cost of downstream weaving mills. Although the machine bag does not expose the core wire, it is generally not easy to produce quality problems during spinning and weaving except for uneven twist, but the output is low, so the price is higher than that of the empty bag of the same specification. It is a machine that is mainly used to process the elastic spandex coated yarn after the low elastic yarn (DTY) and the spandex yarn stretched at a certain ratio are covered by compressed air network.