Production of core spun yarn

There are two kinds of spinning methods of core-spun yarn: one is to discharge polyester filament (or other filament) on the roving frame of ordinary spinning frame, and discharge cotton roving (or spun roving) downward, and the cotton roving is traversed by the horn of the traverse device. Oral feeding, and then through the drafting device. After the polyester filament is drawn out, it is directly introduced into the collector on the back side of the front roller and top roller without going through the drafting device, and is combined with the drafted pure cotton sliver, and then twisted and spun into a core-spun yarn. The second spinning method is to feed the two filaments behind the front top roller, so that the two filaments and the drawn pure cotton sliver are combined and twisted to be spun into a core-spun yarn. This spinning method is called modified core-spun yarn or false core-spun yarn. The characteristics of the second spinning method are: the two filaments are located on both sides of the outer periphery of the cotton sliver, which increases the cohesion between the short fibers and the filaments, and reduces the amount of cotton fibers wrapped on the surface of the yarn due to the first method. The polyester filament is in the middle of the yarn, and the cotton fiber has poor cohesion between the filaments, resulting in a "peeling" phenomenon during weaving. However, in mass production, the first method is generally still used, because a filament is easily spun into a core-spun yarn containing more cotton, the woven fabric is comfortable to wear, and a filament is easy to spin into a relatively Thin core-spun yarn, while the core-spun yarn produced by the false core-spun yarn method is just the opposite.

If spandex elastic yarn is used for the core yarn, a pair of filament feeding rollers should be added to the filament lead-out part of the upper roving frame when spinning the core yarn, and the surface speed of which is lower than that of the front roller, so that the elastic yarn can be It is pre-drafted, and its elongation is controlled to a certain degree, and then it is fed and twisted to form a core-spun yarn with short fiber strands.