There are many differences in performance between different types of polyester yarns. The following are the specific differences in performance between common polyester yarn types:

POY (pre-oriented yarn)
Tensile performance: It has a certain degree of orientation, but low crystallinity and relatively weak strength. It needs further stretching to achieve higher strength. It has a large elongation and can be stretched but not rebound.
Appearance characteristics: The surface is smooth, the fiber thickness uniformity is good, but the glossiness is average, not as good as some other polyester yarns that have been further processed.
Physical stability: Due to the low crystallinity, the dimensional stability is relatively poor during subsequent processing or use, and it is easily affected by external factors and deformed.

FDY (filament)
Tensile performance: The single fiber is parallel, smooth and uniform, with high strength, good wear resistance and tensile resistance, and can withstand certain external forces without breaking easily.
Appearance characteristics: According to different processing processes, there are a variety of gloss effects such as bright, bright, semi-bright, and matte, which can meet the gloss requirements of different fabrics. The fiber surface is smooth and the fabric appearance is relatively flat.
Physical stability: The structure is relatively stable, the dimensional stability is good, and it is not easy to shrink or deform significantly during use and processing.

DTY (stretch yarn)
Tensile performance: It has good elasticity and scalability. After the stretching deformation process, the single fiber is bent and can quickly recover to its original shape after stretching. It is suitable for clothing and home textile products that require elasticity.
Appearance characteristics: The fiber is fluffy, soft to the touch, and has a certain amount of hairiness, which gives the fabric a unique feel and appearance effect, and can increase the fullness and three-dimensional sense of the fabric.
Physical stability: Within the elastic range, it has good stability, but if it is overstretched or affected by adverse environments such as high temperature, it may affect its elastic recovery performance.

ATY (air deformation yarn)
Tensile performance: The strength is generally between POY and FDY, and it has a certain tensile resistance, but due to its special structure, the elasticity is not as good as DTY. It will have a certain elongation when stretched, but the recovery ability is relatively weak.
Appearance characteristics: The surface is not smooth and has a terry structure, which gives the yarn a unique appearance and feel, can bring rich texture and texture to the fabric, and increase the beauty and three-dimensional sense of the fabric.
Physical stability: Due to the existence of the terry structure, the terry may be slightly deformed or shifted during friction or washing, but the overall structure is relatively stable and is not prone to serious quality problems.