Calculation of Yield during Rewinding in the Process of Manufacturing Endless Yarn

This article shows how to calculate the yields of products which are classified by rewinding quantity into grades A, B and C and how to increase the yield of grade A. Used as the basis of calculation is the relation between (1) the statistical mean values and the standard deviation of a group of inputs during winding and (2) statistical mean values and standard deviations of final products.It is difficult to lessen the standard deviation of the winding quantity of a group of inputs or Grade A in a group of outputs, but it is easy to change the mean winding quantity of a group of inputs. Therefore, by fixing the standard deviations we can formulate the relation between the yield of each grade and the winding quantity of a group of inputs and decide the most economical conditions for the rewinding process.