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中文简体The manufacturing process of polyester low elastic yarn differs from that of standard polyester yarn or other types of elastic yarn primarily due to the incorporation of spandex fibers, which provide the elasticity.
Polymerization: The process begins with polymerization, where the raw materials for polyester, typically purified terephthalic acid (PTA) and ethylene glycol (EG), are reacted to produce polyester polymer chips.
Extrusion: In the extrusion process, the polyester polymer chips are melted and extruded through spinnerets to form continuous filaments. These filaments are stretched to orient the molecules, improving strength and elasticity.
Spandex Incorporation: In the case of polyester low elastic yarn, spandex fibers are introduced into the process. Spandex, also known as elastane or Lycra, is a synthetic fiber known for its exceptional elasticity. These spandex fibers are typically introduced into the polyester filament during the spinning process.
Blending and Spinning: The polyester and spandex fibers are blended together in appropriate ratios depending on the desired stretchiness of the final yarn. This blended mixture is then spun into yarn using traditional spinning methods.
Drawing and Annealing: After spinning, the yarn may undergo drawing and annealing processes to further align the molecules and improve the yarn's elasticity, strength, and dimensional stability.
Twisting and Texturizing: The polyester low elastic yarn may also be twisted and texturized to enhance its appearance and hand feel, as well as to improve its ability to hold dye.
Packaging: Finally, the polyester low elastic yarn is wound onto cones or other forms of packaging for distribution to textile manufacturers.
Compared to standard polyester yarn manufacturing, the key difference lies in the addition of spandex fibers and the adjustments made to the spinning process to accommodate the elasticity requirements. This incorporation of spandex fibers allows the polyester low elastic yarn to retain the properties of polyester (such as durability, quick-drying, and shape retention) while also providing stretch and flexibility, making it suitable for a wide range of applications including activewear, sportswear, and intimate apparel.
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