Process of Polyester Twisted Yarn DTY and FDY

Polyester twisted yarn is an important fiber material in the textile industry, widely used in clothing, home textiles and industrial products. The two main types of polyester twisted yarn - DTY and FDY are the most common forms of polyester yarn on the market. Understanding the process of DTY and FDY will help you better choose the products that suit your needs.

What are DTY and FDY?

DTY (Draw Textured Yarn): DTY is a polyester yarn that has been stretched and twisted, mainly used to make textiles with good elasticity, gloss and feel. DTY yarn is characterized by a certain elasticity and fluffiness, and is widely used in knitted fabrics and elastic fabrics.

FDY (Fully Drawn Yarn): FDY is a fully stretched polyester yarn. Compared with DTY, FDY has a more stable fiber structure and higher strength and wear resistance. FDY is usually used to make more durable fabrics, such as denim, work clothes and industrial fabrics.

Process flow of DTY and FDY

Raw material preparation

Both DTY and FDY need to start with polyester (PET) resin. These resins are spun into polyester filaments through melt spinning technology.

Spinning stage

During the spinning process, the polyester resin is first heated to a molten state and then extruded through a spinneret to form filaments. The fibers at this time do not have the required strength and ductility, so further stretching is required.

Stretching and shaping

DTY:

After melt spinning, DTY needs to go through a stretching and twisting process. First, the fibers are stretched to the required fiber fineness and strength. Then, through heat treatment and mechanical twisting, the fibers present a certain tortuous shape, thereby enhancing the elasticity and fluffiness of the yarn. The twisted DTY yarn has better elasticity and softness, and is suitable for fabrics that require elasticity and comfortable feel.

FDY:

FDY is stretched directly after spinning to form high-strength, low-elongation yarns. FDY yarns have a high stretch ratio, usually more than 1.5 times. The stretching process makes the fibers more uniform through heat setting, ensuring their dimensional stability. These yarns will not be loose or too elastic like DTY in the subsequent weaving process, but will maintain a relatively tight and stable structure.

Finishing and dyeing

After stretching and shaping, both yarns will enter the dyeing and finishing stage. This process may involve bleaching, dyeing, coating and other treatments according to different customer needs. There are some differences in the dyeing process between DTY and FDY yarns. DTY usually requires more complex treatment to ensure its elasticity and fluffiness, while FDY is simpler and is usually used in applications with higher fabric strength requirements.

Winding and packaging

Finally, the yarns will be wound into bobbins and undergo final quality inspections. Before packaging, these yarns will be cut to the corresponding specifications according to customer needs to ensure that they meet different production needs.

The difference and application scenarios between DTY and FDY

How to choose DTY and FDY?

Choosing DTY or FDY yarn mainly depends on the needs of the final product:

DTY is suitable for fabrics that require higher elasticity, soft feel and fluffiness, especially in clothing and knitted fabrics. Common applications include sportswear, T-shirts, underwear, etc.

FDY is more suitable for fabrics that require higher strength, stability and wear resistance, and is commonly used in industrial uses such as denim, canvas, work clothes, etc.

Although both DTY and FDY of polyester twisted yarn belong to the type of polyester yarn, they have significant differences in production process, performance characteristics and application fields. Understanding their process and characteristics will help to better recommend the most suitable products to customers. Whether choosing DTY with good elasticity and comfort, or choosing FDY with more strength and wear resistance, the right choice can effectively improve the quality and performance of the fabric.

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