How does rotor spinning work? Principle. Operation. Application

May 27 2022

Open-end spinning has the advantages of high speed, large yarn volume, wide adaptability, simple mechanism and no need for spindles, rings and travellers, which can double the output of spun yarn.

1. How does rotor spinning work?

2. What is the principle of rotor spinning?

3. Rotor spinning operation

4. What is difference between ring spinning and rotor spinning ? Application?

5. Recommended Rotor Spinning

    -TONGDA Rotor Spinning HJF1603

1. How does rotor spinning work?

Rotor spinning is the most extensive system in the open-end yarn manufacturing industry. It has all the necessary requirements for an efficient spinning method. Open end spinning has some limitations. Not suitable for spinning fine yarns. In the process, more bulk will lead to open yarn. A high twist multiplier is used in this method.

Open yarn has good abrasion resistance. This is the particularity of open-ended yarns produced by rotor spinning. Open yarn consists of fibers wrapped around the surface of the yarn. The opening yarn also contains a thin outer layer of fibers with hardly any twist, or even twist in the opposite direction. During each rotation of the rotor, new fibers are attached to the already well-twisted fiber bundles. These latecomers get only a fraction of the required distortion level. If this low twist is lower than the false twist, the fibers will twist in the opposite direction.

( Read More : Ring Spinning : Definition, Process , Main Operations )
( Read More : Jute Rapier Loom : Feature. Raw material. Use. Product )

rotor spinning

_Photo Source : Shandong Tongda Textile Machinery Co.,Ltd

2. What is the principle of rotor spinning?

There are three popular technologies for yarn manufacturing, such as ring spinning, rotor or open-end spinning, and air-jet spinning. Of these, ring spinning is the oldest and has been used to manufacture various yarn counts until now. On the other hand, rotor spinning and air-jet spinning are modern spinning machines. The introduction of these modern spinning machines overcomes the shortcomings of the ring spinning process.

Open or rotor spinning is one of the most modern spinning and winding techniques. In this process, spinning and winding are skillfully combined in one process. The process goes beyond all ring spinning problems by separating twisting and winding in the yarn manufacturing method. It sits side by side with the ring frame. Advances in rotor spinning are due on the one hand to a significant increase in productivity and, on the other hand, to the possibility of fully motorizing the spinning process. This is possible because it integrates the three manufacturing processes of speed frame, ring frame and winding into separate steps. It's not just the economics, it's the constant evolution of your parameters.

_Photo Source : Shandong Tongda Textile Machinery Co.,Ltd

3. Rotor spinning operation:

(1) Sliver feeding: 

The sliver of the card or draw frame is fed to the fast-rotating opening roller through the feeding roller and the feeding table through the sliver guide.

(2) Opening: 

The rotating teeth of the opening roller comb out individual fibers from the sliver sandwiched between the feeding table and the feeding roller. After leaving the rotating opening roller, the fibers are fed into the fiber channel.

(3) Fiber delivery to the rotor:

Centrifugal force and vacuum in the rotor shell cause the fibers to break away from the opening roller at a certain point and move through the fiber channel to the inner wall of the rotor.

Fibers collect in rotor slots: 

Centrifugal force in the rapidly rotating rotor moves fibers from the conical rotor walls to the rotor slots, where they collect to form fiber rings.

(4) Yarn formation: 

When the spun yarn end enters the rotor slot from the drafting nozzle, it is twisted by the rotor rotation outside the nozzle, and then continues into the rotor in the yarn. The yarn end rotates around its axis and continuously twists the fibres deposited in the grooves of the rotor with the aid of a nozzle which acts as a twist maintaining element.

(5) Yarn take-up and winding: 

The yarn formed in the rotor is continuously taken out by the yarn feed shaft and pressure roller through the nozzle and yarn take-off tube, and wound onto the cross-wound package. Between take-up and package, multiple sensors control yarn movement and yarn quality, and start clearing when any preselected value is exceeded.

4. What is difference between ring spinning and rotor spinning ? Application?

Open-end spinning and ring spinning are a new type of textile technology, and the other is an old-fashioned spinning technology. Open-end spinning is open-end spinning, while ring spinning is mechanical spinning, which is twisted by spindles, steel bells, and travellers, and drawn by rollers. On the other hand, open-end spinning is to transport fibers by air, and twist them by holding them at one end. Generally speaking, ring spun yarn has more hairiness than air spinning, higher strength and better quality. The open-air spinning process is short, and the protruding hairiness is less, especially the viscose fiber is more obvious, the fiber on the yarn will not break, but many hairiness is wrapped around the yarn body, so the rotor yarn has less hairiness and counts. The number and degree of rotation cannot be very high, and the price is also low.

In terms of the structure of the yarn body, the ring spinning is relatively tight, while the open-air spinning is fluffy and rough in style, which is suitable for denim fabrics, and the open-air spinning is generally thicker.

5. Recommended Rotor Spinning :

(1) TONGDA Rotor Spinning HJF1603

Based on referring advance technology of other domestic Rotor spinning frame, HJF1603 rotor spinning frame is a sort of high speed, efficient, large package and self-exhausting open-end spinning frame. Based on digestion and absorption of the modern spinning technology and integrated the most advanced scientific and technological achievements, subdivide market requirement, which is especially ordered equipment for waste cotton yarn, wool spinning, flax yarn, gloves yarn and so on particular yarn market.

_Photo Model : HJF1603