spinning of yarn process
Answers
Answer:
The yarn issuing from the drafting rollers passes through a thread-guide, round a traveller that is free to rotate around a ring, and then onto a tube or bobbin, which is carried on to a spindle, the axis of which passes through a center of the ring. The spindle is driven (usually at an angular velocity that is either constant or changes only slowly), and the traveller is dragged around a ring by the loop of yarn passing round it. If the drafting rollers were stationary, the angular velocity of the traveller would be the same as that of the spindle, and each revolution of the spindle would cause one turn of a twist to be inserted in the loop of yarn between the roller nip and the traveller. In spinning, however, the yarn is continually issuing from the rollers of the drafting system and, under these circumstances, the angular velocity of the traveller is less than that of the spindle by an amount that is just sufficient to allow the yarn to be wound onto the bobbin at the same rate as that at which it issues from the drafting rollers.
Each revolution of the traveller now inserts one turn of twist into the loop of yarn between the roller nip and the traveller but, in equilibrium, the number of turns of twist in the loop of yarn remains constant as the twisted yarn is passing through the traveller at a corresponding rate.
Answer:
The spinning of the cotton yarn is the initial stage of textile product processing. The process of producing yarns from the extracted fibres is called spinning. In this process:
The strands of cotton fibres are twisted together to form yarn.
The yarn is placed on the rings of the spinning frame and is allowed to pass through several sets of rollers, which are rotating at a successively higher speed.
The yarn is rolled by the rollers and wound up on the desired bobbins.
This the final stage of spinning the cotton yarn, in which drafting, twisting and winding of the yarn are all completed in one operation.
The bobbins filled with yarn are then removed from ring frames and used for processing for bleaching, weaving, etc.