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The nature of spandex

Edit:Jiaxing Beimon Trading Co.,LtdUpDate:Jun 18, 2018

Spandex was first developed by Bayer of Germany in the late 1930s. In 1937, Bayer developed the first spandex and applied for a patent. In the United States, DuPont developed its own technology in 1959 and began to realize industrial production. The product name is Lycra.


The spandex fiber academic name is "polyurethane fiber", also called "polyurethane elastic fiber", the English name is Polyurethane Fiber, internationally known as "Spandex" (Spandex), is a kind of special high elastic energy Chemical fiber and spandex fiber are high-synthetic synthetic fibers that are rapidly developing at present. Spandex is the most elastic synthetic fiber known in the world. Its elongation length is as high as 500% to 800%, and it has excellent fatigue resistance and high strength. The elastic recovery rate, elasticity lasting, any synthetic fiber can not be compared with it. Spandex's chemical structure is very unique. Spandex's chemical molecular structure is more complex. There are two kinds of segments in its molecular chain, one is a soft segment, giving the fiber elasticity; the other is a hard segment, giving mutual intermolecular interaction. Force to ensure that the fiber has a certain strength. The two different properties of the segments are interspersed with each other and they randomly tangled together during the natural relaxation of the fibers. When there is an external force, the soft segment will be easily deformed due to the small interaction force, and the hard segment will not slide, providing a necessary binding point for the significant elongation and rebound of the soft segment. The fiber has high elastic energy.


According to different spinning methods, the spandex production process can be divided into dry spinning, wet spinning, melt spinning and chemical reaction spinning. At present, over 90% of the domestic spandex fibers are produced by dry spinning and melt spinning methods.