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First U.S. Commercial Spandex Fiber Production: 1959, DuPont Company
Federal Trade Commission Definition for Spandex Fiber: A manufactured fiber in which the fiber forming substance is a long-chain synthetic polymer comprised of at least 85% of a segmented polyurethane. (Complete FTC Fiber Rules here.)
Basic Principles of Spandex Fiber Production The polymer chain is a segmented block copolymer containing long, randomly coiled, liquid, soft segments that move to a more linear, lower entropy, structure. The hard segments act as virtual cross-links that tie all the polymer chains together into an infinite network. This network prevents the polymer chains from slipping past each other and taking on a permanent set or draw. When the stretching force is removed, the linear, low entropy, soft segments move back to the preferred randomly coiled, higher entropy state, causing the fiber to recover to its original shape and length. This segmented block copolymer is formed in a multi-step proprietary process. It is extruded into a fiber as a monofilament threadline or for most products into a multiplicity of fine filaments that are coalesced shortly after they are formed into a single threadline.
Spandex Fiber Characteristics
Some Major Spandex Fiber Uses
General Spandex Fiber Care Tips
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