The difference between the two, we take spandex core-spun yarn and spandex covered yarn as examples.
Spandex core-spun yarn is spandex wrapped with short fibers, with spandex filaments as the core and non-elastic short fibers outsourcing, and the core filaments are generally not exposed when stretched. Spandex covered yarn is an elastic yarn formed by covering the spandex with the filament of chemical fiber, and it is also formed by covering the elongated spandex filament with the non-elastic staple fiber or the filament in a spiral manner with the spandex filament as the core. There is core exposure under tension.
The equipment made is different. The core yarn is made on the spinning frame, and the staple fiber covered yarn is made on the splicing + twisting machine. The long-fiber covered yarn is made on a long-fiber two-for-one twister.
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