Prediction of End Breakage Rate due to Knots in Plain Knitting Zone

A mathematical model for prediction of the end breakage rate due to knots in the plain knitting zone is formulated by using the mathematical model of the plain knitting process and the mechanism of the end breakage due to knots in the plain knitting zone. The only unknown value in the computer program based on this model is the yarn tension (Tp) in the trailing arm of the loop held the needle that got out of the step length of cam.Tp is obtained by the simulated calculation used this program so that the calculated end breakage rate agrees with the experimental end breakage rate. The effects of the depth of stitch draw, the cam angle, the step length of cam, and the take-down weight on the jamming rates of knots and the end breakage rates of knots in the plain knitting zone are analyzed theoretical by using this program. The results obtained are as follows. 1) the jamming rates of knots increase with the increase of the depth of stitch draw, the step length of cam, but decreases with the increase of the cam angle. The take down weight is independent of the jamming rates of knots. 2) the end breakage rates due to knots increase with the increase of the depth of stitch draw, the step length of cam and the take down weight, but decrease with the increase of the cam angle.