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What are polyester FDY and DTY? FDY and DTY process details!

FDY and DTY are actually spinning processing methods, and do not refer to a specific material, mainly used in the production of polyester and other fabrics.

FDY is the abbreviation of Fully drawn yarn, the Chinese name is: fully drawn yarn, is a processing method after spinning. DTY is the abbreviation of Drawn-texturing yarn, and the Chinese name is: drawn deformed yarn. The difference with FDY is that there is a false twist process.

The so-called false twist is in the post-processing, the silk is twisted in a certain direction, and the silk is still straight. But when relaxed, it shrinks and fluffs up. FDY, in its relaxed state, does not contract.

Here are the production steps of polyester fiber spinning of DTY and FDY:

Macromolecular slicing - high temperature into a molten state - various tensile traction - fibers

The detail difference between DTY and FDY is that the difference in the drafting speed of the fiber bundles leads to the difference in the process. There is also a POY here, and DTY is a deformed silk that belongs to POY. POY passes through an overfeeding high temperature equipment, resulting in a more curly DTY, so the DTY fabric will be more soft and fluffy.

The difference in the drafting speed of the fiber leads to the birth of these Y's. The drafting speed of FDY is about twice that of POY, which leads to different changes in the molecular structure of FDY and POY after stretching. FDY fiber is straighter, and POY is relatively more curved.

So simply put, the difference between FDY and DTY in the textile industry is DTY: stretched deformed silk, the fiber is rolled. FDY: Fully drawn silk, the fibers are straight.