Different Parts and Features of Ring Traveller

Different Parts and Features of Ring Traveller

Different Parts and Features of Ring Traveller 
Dipak Baraiya
Dept.of Textile Technology
Maharaja Saiyajirao University, Baroda, India
Cell: +91 9687780158
Email: dipakbaraiya9013@gmail.com

Ring traveler: 
Ring traveler is the most tinny and simple mechanical element in ring frame. It has a direct effect on the quality of yarn produced as their action physically turns the raw material into finished product. So, ring traveller plays very important role in ring spinning system.

Fig: Ring traveler

Functions of Ring traveler:

1. Imparts twist to the yarn and
2. It is responsible for winding the yarn onto the cop.
3. It defines Spinning tension.
4. It defines Winding Tension.
5. Traveller imparts twist to the yarn.
6. Traveller and spindle together help to wind the yarn on the bobbin. Length wound up on the bobbin corresponds to the difference in peripheral speeds of the spindle and traveller. The difference in speed should correspond to length delivered at the front rollers. Since traveller does not have a drive on its own but is dragged along behind by the spindle.

Various Parts of Ring Traveller: 

Toe gap: This will vary according to traveller number and flange width of the ring.

Toe gap

Height of bow: It should be as low as possible for stable running of traveller. It should also have sufficient yarn passage.

Height of bow

Ring contact area: This area should be more, uniform, smooth and continuous for best performance.

Ring contact area

Inner width: This varies according to traveller profile and ring flange.

Inner width

Wire section: It plays an important role for yarn quality, life of traveller.

Wire section

Yarn passage: According to count spun the traveler profile to be selected with required yarn passage.

Yarn passage

Salient Features of a Ring Traveller:

1. Generate Less Heat .
2. Dissipate Heat Fast.
3. Have Sufficient Elasticity For Easy Insertion And To Retain Its Original Shape After Insertion.
4. Friction Between Ring And Traveller Should Be Minimal.
5. It Should Have Excellent Wear Resistance For Longer Life.
6. Hardness Of The Traveller Should Be Less Than The Ring .

Traveller Speed: 

The speed by which the traveller moves around the ring = Π DR NT m/min

• Since traveller does not have a drive on its own but is dragged along behind by the spindle. High contact pressure (up to 35 N/ mm2)is generated between the ring and the traveller during winding, mainly due to centrifugal force. 

• This pressure leads to generation of heat. Heat produced when by the ring traveller is around 300 degree celcius. This has to be dissipated in milliseconds by traveller into the air. 

• Low mass of the traveller does not permit dissipation of the generated heat in the short time available. As a result the operating speed of the traveller is limited. 

• The maximum attainable speed of traveller without getting damaged is known as “Limiting Speed of Traveller”. 

• 70 ft/sec. (22 m/sec) – Conventional Ring- traveller. 

• 120 ft/sec. (35 m/sec) – H.S. Ring- traveller.

Limitations of Ring –Traveller Spinning System

• When the spindle speed is increased, the friction work between ring and traveller increases as the 3rd power of the spindle rpm. Consequently if the spindle speed is too high, the traveller sustains thermal damage and fails. This speed restriction is felt particularly when spinning cotton yarns ofrelatively high strength. 

• If the traveller speed is raised beyond normal levels , the thermal stress limit of the traveller is exceeded, a drastic change in the wear behaviour of the ring and traveller ensues. Owing to the strongly increased adhesion forces between ring and traveller, welding takes place between the two. These seizures inflict massive damage not only to the traveller but to the ring as well. The traveller temperature reaches 400oC to 500oC and the danger of the traveller annealing and failing is very great.

All together restricts spindle speed, thereby production of ring frame. 

Traveller Count:

• It represents weight of ten equal type of travellers in grains.
• OLD System: 10 travellers weigh 10 grains then traveller count = 1
• ISO System: Weight of traveller in mgm OR Weight of similar 1000 travellers in gm.
• 10 travellers weigh <10 grains then traveller is said to be the “Ought traveller” or ”Nought traveller”. Denoted by N/0; where N represents traveller count.
• Higher the count heavier the traveller