FDY, POY, DTY, ATY, Can you distinguish these filaments?


Guid:FDY, POY, DTY, ATY, Can you distinguish these filaments?

This article will introduce in detail the appearance features of FDY, POY, DTY, ATY, and the differences between their finished products, and explain their differences in all aspects.

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FDY, POY, DTY, ATY, Can you distinguish these filaments?

#1. FDY


Synthetic filament

The synthetic fiber filament is further obtained by spinning and drawing. The fiber has been fully stretched and can be directly used for textile warping processing.


Conventional fully drawn yarns such as polyester and nylon belong to chemical fiber filaments. FDY fabric feels smooth and soft, which is often used to weave imitation silk fabrics. It has a wide range of uses in clothing and home textiles.


#2. POY


 Stretch textured yarn

Refers to incompletely stretched chemical fiber filaments with an orientation degree between unoriented filaments and drawn filaments obtained by high-speed spinning. Compared with undrawn yarn, it has a certain degree of orientation and good stability. It is commonly used as a special yarn for draw textured yarn (DTY).


#3. DTY



It is made by using POY as protofilament, which is processed by stretching and draw textured. Often have a certain degree of elasticity and contractility.


#4. ATY



Invented by DuPont of the United States, the principle is to use the air jet method to interlace the tow to form irregular twisted loops through the air jet technology, so that the tow has a fluffy loop-like yarn. The processed textured yarn has the properties of both filament and spun yarn, with strong wool feeling, good hand feeling, and better coverage than spun yarn.


4.1 Use

It is suitable for weaving and knitting. Using air texturing technology, it can be made into monofilament or multifilament with medium and fine deniers, or core-spun wool, hemp, cotton, etc., called yarn-like textured yarn, which can also be processed Coarse denier yarn for carpets, sofas and tapestries. Four types of raw yarns can be discharged on a general air texturing machine. The original yarns can be monofilaments or pre-oriented yarns. The monofilament fineness of general textured yarn is lower than 2.8 DTEX (2.5D). In order to increase the number of loops on the yarn, the oil content of the raw silk should be low.


4.2 Physical properties

Air textured yarn is superior to the original yarn before deformation in terms of bulkiness, air permeability, gloss, and softness. The fineness is 10-15% higher than that of the original filament, and the boiling water shrinkage is maintained at about 3%, but the strength is reduced by 40%, because only a small part of the monofilament is stretched, but it bears the load-bearing capacity of the entire tow.


#5. Other chemical fiber filament types


Primary yarn: un-drawn yarn (conventional spinning) (UDY)

Semi-pre-oriented yarn (medium-speed spinning) (MOY)

Highly oriented yarn (ultra-high-speed spinning) (HOY)

Drawing yarn: low-speed drawing yarn (DY)

Full-fetching yarn (one-step spinning method) (FOY)

Textured yarn: conventional textured yarn (DY)


#6. Identification method

6.1 Hand-drawn method

Generally, POY can be stretched longer, while FDY can be stretched less. Because POY is a pre-oriented yarn, it is not fully stretched, and the remaining elongation must be above 50%; while FDY is a fully oriented yarn, the remaining elongation is generally above 40%, which is relatively stable.


6.2 Appearance recognition method

DTY fibers are crimped, POY and FDY fibers are straight, while FDY has better strength, and POY is less powerful.


#7, The difference between filament and short fiber


Filament is a continuous thread obtained from natural or chemical fiber processing. It is divided into monofilament and multifilament without cutting process.


Short fiber (SPUN) refers to fibers with a length of a few millimeters to several tens of millimeters, such as natural fibers include cotton, wool, and hemp, which can also be made by cutting filaments.

Short fiber

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