Abstract:
This work presents the effect of vibration on yarn tension as well as friction between ring and traveller and their temperature rise during spinning. It also examines how friction force is affected by amplitude and frequency of vibration at different methods of vibration applied at ring.
Three external vibration generating facilities are designed and placed in a miniature ring spinning frame to generate and apply vibration to the ring. The miniature ring spinning frame has the facility to vary twist and count of yarn and was modified to vary the spindle speed in the range 6500 –13000 revolution per minute approximately. During this study, the amplitude and frequency of vibration were varied between 0.1 to 1mm and 100 to 800 Hz, respectively. During this work, it is found that ring-traveller friction is influenced by the application of vibration and the properties of cotton yarn are also influenced with the effect of vibration. Results are compared with and without vibration status.
It was found that friction between ring and traveller was reduced 3-24% depending on the speed of the traveller and the way of vibration application to ring along with amplitude and frequency of vibration. The strength, elongation and evenness of the cotton yarn showed improved quality.
Therefore it can be concluded that application of vibration may be a way of reducing friction between ring and traveler and thus the mechanical process of twisting and winding can be done at high speed for higher productivity of ring spinning system which is a limiting factor of this system.
With the application of vibration the variation of yarn qualities such as its strength, elongation, evenness and hairiness properties are explained and compared to without application of vibration product.
