Q.1- WHY IS THE OPEN-END SPINNING SYSTEM NEEDED?
C.1.In ring spinning method It is a spinning method that is needed as an alternative due to the limited production speed.
Q.2- HOW MANY NUMBERS OF YARN CAN BE OBTAINED IN THE OPEN-END SPINNING SYSTEM?
C.2. On open-end spinning machine, from 12 tex to 150 tex (Nm 85, Ne 4 to Ne 50) yarn is obtained.
Q.3- What is the basic principle in Open-End spinning system?
C.3.The basic principle in open-end spinning machines is to separate the fiber group as a single fiber. then it is to collect it again in a regular way and bring it to the form of yarn.
S.4- IN OPEN-END SPINNING SYSTEM; WHICH STAGE IS THERE IN THE RING SPINNING SYSTEM?
C.4. Roving stage in ring spinning system They do not.
Q.5. Explain 4 of the differences between Open End Yarn and Ring Yarn ?
1-The production speed in Open-End spinning is higher than in Ring spinning systems. This is a factor that reduces costs while increasing production.
2-The process stages in Open-End spinning are shorter than in Ring spinning. This is one of the cost-reducing factors.
The yarn produced in the 3-Open-End system is more voluminous, more elastic, more absorbent and less hairy than Ring yarn. Handle is also good if not too high twist. A good absorbency feature ensures a high percentage of sizing and brighter tones.
4-The properties of the yarn produced in the Open-End system are less variable than the Ring yarn. Fineness, unevenness, durability etc. vary less throughout the yarn.
5-According to the process, the cross section of Open-End yarns must have an average of 70-100 fibers. This is why Open-End yarns cannot be produced in fine counts as Ring yarns (requires 50-70 fibers in the cross section).
For example, although Ne40 yarn can be made theoretically in the Open-End system, in practice Ne30 yarn cannot be exceeded.
A technological disadvantage of 6-Open-End spinning is the helical fibers formed on the yarn surface. When the spun yarn is fed into the rotor cavity, some of the fibers are wound on the surface of the yarn in the twist direction. We can use this feature to separate Open-End yarns from Ring yarns. When we try to open the yarn with our two thumbs in the opposite direction of the twist, we can notice that the Ring yarns are untwisted and the fibers come out, but on the surface of Open-End yarns, the spiral fibers mentioned above do not allow the yarn to untwist and we see that the yarn remains twisted.
The strength of 7-Open-End yarns is 15-20% lower than Ring yarns. Strength can be increased by increasing the twist more. But this causes the attitude to harden.
8-Open-End yarns are mostly short fiber yarns.
9-Open-End yarns are generally used in the production of many products that do not require very high strength. Its usage area is expanding day by day. Technologically, Open-End yarns can be used as weft and warp yarns in weaving. It is more uniform, less thin, elastic and has higher abrasion resistance, which is advantageous for use in warp compared to ring yarns. Due to the good absorbency, they are also sized well. As a weft yarn, its uniformity and friction resistance provide advantages for Open-End yarns. Open-End yarns can also be used in the production of knitted fabrics. Due to the voluminous nature of Open-End yarns, it is extremely suitable to be produced as hand and machine yarn. However, the low strength of Open-End yarns shows itself as a negative effect.