PORT CITY INTERNATIONAL UNIVERSITY

GOOD EVENING TO ALL

WELL COME TO OUR

PRESENTATION

GROUP MEMBER

MD RIAZ UDDIN (BTE 00605321)ABU BAKKAR (BTE00605340)EMON DAAS (BTE 00605294)

MD MOHIUDDIN (BTE 00605293)

TOPICS OF THE PRESENTATION

RING SPINNING SYSTEM &

ROTOR SPINNING SYSTEM

CONTENS:

* DEFINATION *OBJECT* ADVANTAGES AND DISADVAN TAGES* M/C DESCRIPTION BY SUITABLE FIGURE* OPERATING SYSTEM *CONCLUSION

RING SPINNING Ring spinning is a method of spinning fibres, such as cotton, flax or wool, to make a yarn by using proper twist and draft from suitable sliver.

Ring Spinning Machine

Introduction The ring spinning machine was invented in the year 1828 by the American Thorp. In 1830, another American, Jenk, contributed the traveller rotating on the ring.

Objects of ring spinning frame:Following are the objects of ring spinning-   ●To draft the roving feed to the ring frame.   ●To impact the strength to the fibre strand by twisting.   ●To wind up the resulting yarn on to bobbin.   ●To build up the yarn on to bobbin in form of a suitable for storage, transportation and processing.

Main operations of ring machine:   ● Creeling: By this process the drawn sliver is introduced to the draft zone from sliver can manually.● Drafting: To reduce the weight per unit length by drafting i. ● Twisting: To make turn within the fibre of the drafted material to hold them together.and increase the strength. ● Winding: To wound the roving to bobbin for suitabe carrying for the next process   ● Building: By this process the roving is wound in full length of the bobbin    ● Doffing: Doffing is to replace an empty bobbin at the place of fully wound bobbin.

Advantages of ring spinning

*It is universally applicable, most of the textile fibres can be spun to required fineness.

*It gives uniform structure and good strength

* It is easy to operate as compared to other spinning machines.

Disadvanteges of ring spinning*More process stages. Roving stage exists as an extra process compared to the other systems *Yarn breakage ar morely occour due to friction of traveller and ring.* The high speed of the traveller damages the fibers.*The capacity of the cops is limited.*Energy cost is very high.*Low production rate.

Typical view of a Ring Frame

Major parts of ring spinning

Ring

Apron roller with apron

Steel fluted bottom roller

Synthetic rubber coated top roller

Twisting zone

IntroductionRotor spinning or open-end spinning is a

technology for creating yarn without using a spindle. •It was invented and developed in Czechoslovakia. •Open End spinning is also known as break spinning or free fiber spinning

ROTOR SPINNGING SYSTEMBakkar Start

To provide a more economical spinning system than conventional ring spinning through higher productivity

To produce yarn of a quality that matches or surpasses that of the conventional ring spinning.

Objectives of Rotor Spinning

Flow process chart of rotor spinning

Sliver feeding.Sliver Openning.Fiver transfer to the rotor.Fiber collection to the rotor groove.

Yarn formation.Yarn take –up or winding.

THE PRINCIPLE OF ROTOR SPINNING

Skipping process of rotor spinning

Bakkar End

High delivery speeds;Low yarn production costs (lower than those of ring

spinning);Elimination of rewinding;Low end breakage rates;Yarn character similar to that of ring-spun yarn;No wrapping fibers;Optically good mass evenness (well suited to knitted

goods);Better and softer handle than that of rotor-spun yarn;Smooth yarn appearance.

Advantages of Rotor spinningMohiuddin start

Low yarn strength;High tendency to snarl;Higher number of fibers needed in yarn

cross-section;Difficulty of keeping spinning conditions

constant;High air consumption;Increasing unevenness and imperfections

with increasing spinning speed, and further reduction in yarn strength.

DISADVANTAGES ARE

Mohiuddin End

Emon Start

Difference beetwen ring & rotor spinning

Difference between ring yarn & rotor yarn

At last we would like to say that presentation taken at spinning has broadened our knowledge and has widened our thinking as a profession.

Conclusion

THANKS TO ALL

Emon End