|Ring Spinning||Open-end Spinning|
|Bobbin rotates constantly for insertion of twist||Spool does not need to be rotated to insert twist|
|Cannot handle spools of bigger size||Much larger spools can be wound|
|Can spin finer yarns||3-5 times faster than ring spinning|
|Uniform and strong yarn||Uniform but flexible yarn with better dye ability|
|Combed yarns (finer)||Carded yarns (coarser)|
|Yarns for varied applications||Yarns for heavier fabrics such as denims, towels and poplins|
|Stronger||20% more twisted but 15-20% weaker as the yarn is coarser|
|Suitable for all staple fibres||Not suitable for man-made staple fibre spinning except rayon as the fibre finish clogs the rotor|
|Ring Spinning vs. Open-end Spinning|
Open-end or Carded or Break or Rotor Spinning
- The twist in the yarn being determined by the ratio of the rotational speed of the rotor and the linear speed of the yarn.
- The production rates of rotor spinning is 6-8 times higher than that of ring spinning and as the machines are fed directly by sliver and yarn is wound onto packages ready for use in fabric formation.
- The yarn is a lot cheaper to produce.
- Rotor spun yarns are more even, somewhat weaker and have a harsher feel than ring spun yarns.
- Rotor spun yarns are mainly produced in the medium count (30 Ne, 20 Tex) to coarse count (10 Ne, 60 Tex) range.
- End uses include denim, towels, blankets socks, t-shirts, shirts and pants.
- The use of this system has two basic advantages. It is fed by sliver, not as with the ring frame by roving, and so eliminates the speed frame from the process line. It can also be modified to remove any remaining trash, thereby improving the yarn quality.
- Open-end yarns tend to be more uniform, lower in strength, more extensible, bulkier, more abrasion resistant and more absorbent. It is likely then with all of these differences, only some of which are beneficial, that open-end spinning will not replace ringspun yarn as originally thought, but will be a complimentary product.
- Open-end spinning operates at a rate up to five times that of ring spinning and can be effectively used for cotton, polyester-cotton blends, as well as other short and medium staple systems.
- Synthetic staple fibers such as polyester alone can not be effectively open end spun due to dusting of oligomer from the fibers that interferes with the spinning action of the rotor.
- Advantages of Ring Spinning
- Production of high strength yarns.
- Spinning of fine count yarns.
- Proper for special yarns.
- It is universally applicable (any material can be spun).
- The know — how for operation of machine is well established accessible to everyone.
- It is flexible as regards quantities (blend and lot size).
- Since the speeds in drawing section are best controlled, yarn evenness is excellent. But if short fibers are too much, yarn unevenness occurs.
- Fine yarns can be produced as compared to open-end system.
Disadvantages of Ring Spinning
- Process stages are more numerous. Roving stage exists as an extra process compared to the other systems.
- Yarn breakages are more numerous as a result of ring traveler friction and yarn air friction. Interruptions, broken ends and piecing up problems exist because of the yarn breakages.
- The high speed of the traveler damages the fibers.
- The capacity of the cops is limited.
- Energy cost is very high.
- Low production rate.
- New spinning processes have difficulty in gaining widespread acceptance. Owing to their individual limitations, the new spinning processes are confined to restricted sectors of the market.
- The ring frame can only survive in longer term if further success is achieved in automation of the ring spinning process. Also, spinning costs must be markedly reduced since this machine is significant cost factor in spinning mill.
- The cost structure in ring spinning mill is shown in the graph.