Dyeing and Finishing Processes After the filament is created, it undergoes rigorous post-processing to achieve the desired aesthetic and functional properties. This unique molecular architecture is the fundamental reason spandex can stretch up to five to eight times its original length and still return to its initial shape.
Understanding Cross Linking Agents in Spandex Fabric
Prepolymers are created by reacting diisocyanates—often methylene diphenyl diisocyanate (MDI)—with polyols. The prepolymer is dissolved in a solvent, such as N-methyl-2-pyrrolidone (NMP), to create a viscous solution.
The Core Component: Polyurethane At the heart of every spandex fiber lies a long-chain polymer known as polyurethane. The fibers are typically heated and stretched in a steam bath, a process called "texturizing," which sets the permanent elastic memory.
Understanding Cross Linking Agents in Spandex Fabric
Comparing Spandex to Other Elastomers. Performance Characteristics and Applications The specific chemical composition of the polyurethane dictates the performance metrics of the spandex fabric.
More About What is spandex fabric made of
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