Lay in spinning

Lay is the measure of the closeness of the spacing of the coils of yarn in any one layer on the bobbin. It is normally given as the number of coils per inch measured parallel with the axis of the bobbin.

Factor does the closeness of lay depends

The closeness of the lay depends upon
(a) the rate of delivery by the front roll
(b) the rate at which the ring rail is traversed
(c) the diameter on which the yarn is wound

In as much as the rate at which the front roll revolves depends upon such factors as the size of the yarn being spun, the spindle speed and the twist per inch, the proper lay is obtained by changing the rate at which the ring rail is traversed up and down. 

The diameter of the package being wound varies, depending upon the type of package being wound and the position in the package.

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