The difference of polyester full stretch yarn and polyester low elastic yarn

Polyester Full Stretch Yarn:

Polyester full stretch yarn, also known as spandex or elastane, is a type of yarn that exhibits excellent stretch and recovery properties. It is made by combining polyester fibers with elastic fibers, typically polyurethane, during the spinning process. The addition of elastic fibers allows the yarn to stretch significantly and then return to its original shape when the stretching force is released. Polyester full stretch yarn offers high elasticity and provides enhanced comfort and flexibility in fabrics.

Polyester Low Elastic Yarn:

Polyester low elastic yarn, also known as textured or partially elastic yarn, is a type of yarn that has limited stretch and recovery properties compared to full stretch yarn. It is made by texturing or crimping the polyester fibers, which introduces some degree of elasticity into the yarn. However, the level of elasticity in low elastic yarn is lower than that of full stretch yarn. Fabrics made from low elastic yarn provide a moderate level of stretch and can offer some flexibility and comfort, but they do not exhibit the same degree of elasticity as full stretch yarn.

In summary, the main difference between polyester full stretch yarn and polyester low elastic yarn lies in their stretch and recovery properties. Full stretch yarn has high elasticity, allowing it to stretch significantly and return to its original shape, providing enhanced comfort and flexibility. On the other hand, low elastic yarn has limited stretch and recovery properties, offering a moderate level of elasticity and flexibility in fabrics. The choice between these yarns depends on the specific requirements of the fabric and the desired level of stretch and comfort.

Besides,here is a breakdown of the structure of polyester full stretch yarn:

    Core: The core of the yarn is made up of elastic fibers, which provide the stretch and recovery properties. The most common elastic fiber used is polyurethane, known for its excellent elasticity and durability. The core is responsible for the yarn's ability to stretch and return to its original shape.

    Sheath: The sheath refers to the outer layer of the yarn, which is composed of polyester fibers. Polyester is a synthetic fiber that offers strength, durability, and dimensional stability to the yarn. The polyester fibers form a protective covering around the elastic core, providing structure and stability to the yarn.

    Composite Structure: The core and sheath fibers are combined during the spinning process to form a composite structure. The elastic core is typically thinner than the surrounding polyester sheath, allowing the yarn to stretch and contract while maintaining its overall integrity. The sheath fibers tightly encase the core, ensuring that the elastic component remains secure within the yarn structure.

    Interlocking: The core and sheath fibers are interlocked, forming a strong bond between the elastic and polyester components. This interlocking structure allows the yarn to stretch when subjected to tension and recover its original shape when the tension is released.

Overall, the structure of polyester full stretch yarn involves a core-sheath arrangement, with the elastic core providing stretch and recovery properties, and the polyester sheath offering strength and stability. This composite structure enables the yarn to exhibit high elasticity and flexibility, making it suitable for applications where stretch and comfort are desired, such as in activewear, swimwear, and stretch fabrics.