In the textile industry, polyester FDY (fully drawn yarn) yarn and POY (pre-drawn yarn) yarn are two common types of polyester yarn. There are significant differences in their production processes, and these differences have a direct impact on the quality, cost and production efficiency of the final product. Here are the main differences between the two types of yarn and how they affect production:

1. Differences in production processes
POY (Pre-Stretched Yarn): POY is a semi-finished yarn formed by heating and stretching polyester raw materials to a certain extent. It has a low degree of stretch and can be further processed through subsequent processing (such as spinning, heat setting, etc.).
FDY (Fully Drawn Yarn): FDY is a yarn made by fully drawing and shaping polyester fibers. It has a higher draw ratio and higher strength and can usually be used directly without further processing.

2. Differences in physical properties
POY: POY yarns have relatively low strength and tenacity and are suitable for products that require subsequent processing, such as fabrics and certain types of textiles.
FDY: FDY yarn has higher strength, smooth surface, good elasticity, good abrasion resistance and UV resistance, and is suitable for high-quality end products such as high-grade fabrics and seamless fabrics.

3. The difference between production speed and efficiency
POY: POY can be produced faster because its production process is simpler. It is suitable for situations where there is more demand for subsequent processing in mass production.
FDY: The production process of FDY is more complicated, involving a complete stretching and shaping process, so its production speed is relatively slow. However, due to its higher quality and performance, FDY is suitable for some applications with higher quality requirements, although the production cost is higher than POY.

4. Differences in application areas
POY: POY is mainly used for post-textile processing, such as weaving, dyeing, etc., and is suitable for the production of some mid- and low-end fabrics. It is also commonly used in the manufacture of zippers, textiles and some decorative products.
FDY: FDY is commonly used to produce seamless fabrics, high-end fabrics, sportswear and high-performance fabrics, especially in products requiring high strength and durability.

5. Impact on production costs
POY: Due to the simple production process, the production cost of POY is low. This makes POY the material of choice in some cost-sensitive production areas.
FDY: FDY has a higher production cost because its production process is more complicated and requires more equipment and processing steps. Therefore, FDY is often used in products that have higher requirements on quality and performance.

6. Summary of production impact
POY: Suitable for mass production with short production cycles, but may not be as good as FDY yarn in terms of quality and durability of the final product. The production process has a strong dependence on subsequent processing.
FDY: Although the production cycle is long and the cost is high, due to its excellent performance, FDY can be directly used in the manufacture of high-quality products, reducing subsequent processing steps and improving the overall quality of the product.