1. Primary silk: undrawn yarn (conventional spinning) (UDY), semi-pre-oriented yarn (medium speed spinning) (MOY), pre-oriented yarn (high-speed spinning) (POY), high oriented yarn (ultra-high speed spinning) (HOY).
2. Drawn yarn: drawn yarn (low-speed drawn yarn) (DY), fully drawn yarn (spinning and drawing one-step method) (FDY), full silk extraction (spinning one-step method) (FOY).
3. Textured yarn: conventional textured yarn (DY), tensile textured yarn (DTY), air textured yarn (ATY).
Among them, DTY Draw texturing yarn, also known as polyester low-elastic yarn, is a finished yarn that has been continuously or simultaneously stretched and deformed on one machine.
FDY Fully drawn yarn. It has nothing to do with the production process, but it is widely spread, it is the code name of the one-step process of spinning and stretching, which can be used for low-speed spinning, high-speed stretching and winding, and the two processes are completed on a spinning and stretching combined machine, the production cost of this production line is low, and the quality of the finished product is stable, the wool silk is less broken, and the dyeing uniformity is good.
DTY fibers are crimped and FDY fibers are straight.