Spandex covered yarn is processed mainly with spandex yarn as the core part, and it is also a kind of elastic yarn. In the case of air spandex covered yarns, the fabric is very soft to the touch and requires a high degree of air compression to complete. It is very regular and has a strong rhythm in use. The product purchased is a mechanical spandex covered yarn, which is flatter in style and is also very stiff. This is the main feature.
If we consider the cost, the cost of air spandex covered yarn is lower than the cost of mechanical. Mechanical yarn does not have the problem of exposed cores and is less prone to product quality problems, but the yield is lower. The price of fine denier is much higher than the two types of products introduced above. When you buy it, you can buy it carefully according to your usage and needs.
Spandex Covered Yarn Production Process
In the spinning process, the pre-drafting of spandex is an important process parameter that affects the elasticity of the covering yarn and the fabric, as well as the strength and elongation, the uniformity of the strip and the creep performance. Spandex pre-drawing times too small, can not give full play to the advantages of elastic fabric fabric elasticity, draw too high when spinning difficulties, but also easy to cause broken yarn, the quality decreases; In addition, the percentage content of spandex yarn also affects the elasticity, high content, good elasticity. In the case of a certain specification, increase the drafting times, the percentage content decreases, that is, the pre-drafting times of spandex and into the yarn spandex percentage content is inversely proportional.
The strength and elongation of air spandex covered yarn increase with the increase of spandex pre-draft ratio. After stretching reaches a certain value, the retraction of spandex yarn makes the outer fibers curl; when the pre-draft ratio is increased appropriately, the spandex percentage decreases and the curl of outer wrapped fibers is large. However, when the draft is too large, the deformation of spandex yarn is close to the critical value of deformation, which will reduce the strength and elongation of spandex covered yarn, but is conducive to the uniformity of spandex covered yarn.
Spinning process, spandex pre-drafting times is an important process parameters, it affects the covering yarn and fabric elasticity, but also affects the covering yarn strength and elongation, the uniformity of dryness and creep performance.