Textile Spinning – There are a variety of spinning techniques which are getting used to supply spun yarns. However, three techniques (Ring spinning, Open end rotor spinning and Air jet spin-ning) are common within the industry which can be discussed within the following subsections.
Following are the tasks which are required to realize from ring spinning:
- Drafting to attenuate the roving up to the specified fineness –– Twisting to impart strength
- Yarn winding to form an appropriate package
Following is that the operation summary to realize the tasks of ring frame:
Roving packages made on roving frame are positioned on the hangers of the ring frame creel. Flow of fabric through ring frame. Roving is fed to the drafting system through guiding rods and roving guide. The drafting arrangement attenuates the roving with a draft required to form the ultimate yarn count.
The ribbon exiting from the drafting system is just too thin and it cannot withstand itself. So twist inserting step is important to impart strength immediately. This step is performed by the ring and traveller with the assistance of spindle. during this process, each rotation of the traveller on the spinning ring produces a twist within the yarn.
The ring traveller has no drive of its own; it’s dragged with spindle via the yarn attached thereto. Winding of yarn on the bobbin is administered thanks to the upper speed of spindle than the traveller. The yarn is aroused into a cop form by raising and lowering of ring rail.
Winding – Textile Spinning
Winding is the creation of huge yarn packages which will be easily unwound. This makes easier and economical use of yarn on subsequent machines. Thus all yarns made on ring frame are wound within the sort of large cones on Autocone winding machine. Yarn faults also are removed on this machine with the assistance of yarn clearer.
Open End Rotor Spinning – Textile Spinning
In open end rotor spinning process the preparatory processes include the operation of the blow room, card and draw frame passage. For the spinning of coarser yarn counts with shorter fibre length, card sliver can directly be fed to the rotor machine. However the necessity of right quality of sliver determines the need of 1 or two draw frame passage after carding process. rather than classical roller drafting technique, the disper-sion drafting is employed in rotor machine. Twist is additionally inserted thanks to the rotation of the rotor.
Usually, the sliver cans from the primary draw frame are placed under the Open end rotor machine. The flow of fabric through open end rotor machine. The sliver from can is fed to the feed roller with the assistance of sliver guide. Combing roller takes the sliver from feed roller and opens it up to individual fibre and delivers these fibres to the rotor through a fibre transfer tube. The fibres are depos-ited onto the rotating rotor and slump into the rotor groove and form a ribbon of fibres. The rotor rotates at very high speed creating a force thanks to which rotor is under a partial vacuum.
Ribbon of Fibres
To start spinning, a length of yarn already wound onto the package of the take-up mech-anism is threaded through the nip line of the delivery rollers and into the draw-off tube. due to the partial vacuum, the tail end of this yarn is sucked into the rotor thanks to vacuum. The rotation of the rotor pulls the yarn end onto collected ribbon of fibres and simultaneously inserts twist into the yarn tail. a touch of this twist propagates into that a part of the ribbon in touch with the yarn tail, binding it to the yarn end. Once the yarn tail enters the rotor, the delivery roller is about in motion to tug the tail out of the rotor. The pulling action on the trail leads to a peeling of the fibre ribbon from the rotor groove. The newly formed yarn is aroused on the package by a winding drum.
The production rate of rotor spinning is 6–8 times above that of ring spinning. Open end rotor machines are fed directly by sliver and yarn is wound onto packages ready to be used in fabric formation so in open end rotor spinning, just one machine is employed rather than three machines Textile Spinning (Roving frame, Ring frame and Autowind-ing) in ring spinning. Rotor spun yarns are more even but somewhat weaker and have a harsher feel than ring spun yarns.