Why does adding spandex to blended jersey fabric improve its recovery properties after being stretched?

Adding spandex to blended jersey fabric improves its recovery properties after being stretched because of spandex’s unique elastic characteristics:

High Elasticity: Spandex is known for its exceptional ability to stretch and return to its original shape. When blended with fibers like cotton or polyester, spandex can stretch up to 5-8 times its original size without breaking. This high degree of elasticity allows the fabric to move with the body and snap back after stretching, ensuring the fabric doesn't become baggy or misshapen over time.

Molecular Structure: Spandex fibers consist of long-chain polymers with a flexible backbone. These polymers can expand when stretched and then contract when released. The elasticity comes from the arrangement of soft, elastic segments that can elongate and hard, rigid segments that force the fiber to return to its original shape. This balance of stretch and structure enables the fabric to recover well after deformation.

Distributed Tension: In blended fabrics, the spandex fibers act as an internal "spring," distributing tension across the material. This helps prevent permanent deformation and maintains the fabric's shape even after extended use.

Improved Durability: The addition of spandex also improves the overall durability of the fabric, reducing wear and tear from repeated stretching. This resilience contributes to the fabric’s ability to retain its stretch and recovery properties over time, making it suitable for clothing that demands flexibility and form retention, such as activewear.

By incorporating spandex, blended jersey fabric gains enhanced stretch and recovery abilities, improving fit, comfort, and longevity for garments.