REQUEST_UNK,POY：预取向丝，全称：PRE-ORIENTED YARN 或者PARTIALLY ORIENTED YARN.

It refers to the uncompletely stretched synthetic filament between the unoriented silk and the drawing thread. Compared with the undrawn silk, it has a certain degree of orientation and stability. It is often used as a special wire for stretching the yarn (DTY).

DTY: DRAW TEXTURED YARN.

It is made by using POY as raw silk, stretching and false twisting. There is a certain elasticity and contractibility.

FDY: whole body silk. FULL DRAW YARN.

The synthetic fiber filament is made from the spinning of spinning. The fiber has been fully stretched and can be used for textile processing.