End breakage is a common phenomenon in spinning. It is one the basic ways to increase profit and quality in the ring spinning process is to keep the end breakage rate to a minimum level. The end breakage rate is a critical spinning parameter that not only affects the maximum spindle speed but may also indicate the quality of yarn, the mechanical condition of the machine and the quality of raw materials. Therefore, it is an important parameter which determines the overall working of a spinning mill.
Substantial research works have been carried out to predict likely end breakage rates in ring spinning. Most of these are based on large numbers of simplifying assumptions and complexity of calculations. Moreover, in many cases, they do not reflect the results which are compatible with the actual situation.
To reduce end breaks, the following aspects should be taken into consideration:
I. Since end breakage in ring spinning is related to slippage of fibres at the spinning triangle as a result of peaks occurring in the spinning tension fibre, the grip at the front drafting rollers should be increased by having a higher top roller pressure. The use of softer cots also enhances the grip at the front rollers. If the total pressure on the rollers cannot be increased, the grip at the front rollers nip can be improved by reducing the width of the cots.
II. A reduction in friction between ring and traveller could reduce the peak tension during the rotation of the traveller.
III. Measures should be taken to reduce the mass irregularity of yarn straight after carding.
IV. The width of the drafted ribbon at the front roller nip should be reduced.