A Parametric Model of Fiber Transfer from Swift to Doffer

A parametric model of fiber transfer to a doffer, based on the geometry of the system and physical models of fiber transfer, was developed to describe the efficiency with which doffers collect fiber from the high-speed carding roller. Doffer speed, normalized to that of the cylinder, was adopted as the variable and parameters, such as wire height, pitch, width, and fiber-layer thickness on the cylinder, were introduced to describe the process of fiber transfer. The equation for doffer efficiency developed by this procedure was tested by fitting it to data on hauteur and noil from a worsted-carding trial employing a range of drafts and production rates. The calculated efficiency of the doffer for these trials was found to lie in the range 0.15—0.25. The effects of changes in the dimensions of the card wire and layer thickness were predicted by changing the values of the parameters.