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Views: 27 Author: Site Editor Publish Time: 2022-11-05 Origin: Site
In the wrap spinning system, a continuous filament or another spun yarn is wound around a non-twisted core containing well-drafted parallel staple fibers.
Figure belows shows a schematic diagram of the wrap spinning process. The input strand is a roving fed to the drafting zone, which consists of a 3 over 3 roller drafting system. The drafted strand is then passed through a hollow spindle which carries the filament package. By rotating the hollow spindle, the package also rotates, and the filament is wound around the relatively untwisted staple yarn core. For each rotation of the hollow spindle, one wrap is inserted. This physical process resembles ring spinning, in which one rotation of the spindle inserts one turn of twist. The yarn is then taken off onto a package.
The twisting mechanism in wrap spinning is designed such that there is no balloon formation; consequently, the restriction to spindle speed due to traveller speed is eliminated as the system does not require the traveller for inserting a wrap. Due to the absence of a balloon, the yarn tension is also low. However, constraints to increase the spindle speed and therefore the productivity based on energy consideration obviously remain because the mass of filament package has to be rotated. Although the actual spinning speeds are somewhat higher, in the vicinity of 30,000 rpm, than in ring spinning, this may be attributed to the following reasons
Even though the whole package of the filament yarn is required to be rotated, the energy consumption is relatively low. This is due to the fact that a larger quantity of finer filament yarn can be accommodated on a relatively smaller package.
The filament package is enclosed, which helps to lessen the air drag and therefore the energy consumption.
The drafting system works somewhat faster than in ring spinning, but it is still slower than that of the open-end and air-jet spinning systems.
