4 - To make yarn smooth by applying wax on the yarn surface.
6 - To remove dirt and dust from the yarn up to some extent.
In precision or spindle winding, the package is driven positively. The package is mounted on the spindle having positive drive. When the spindle rotates, it pulls the yarn and wind it on the package. The coils of yarn forms with the help of yarn traverse guide which helps to move the yarn from one end to another end of package thus coil formation takes place. Traverse guide makes to and fro motion with the help of a cam. In precision winding, successive coils of yarn are laid close together in a parallel or near parallel manner. It is used primarily for filament yarn. There is no chance of yarn rupture in this process but more yarn elongation occurs in this process. The package resulted in this process has higher winding density. Due to higher winding density, package contains higher amount of yarn on it. Packages are wound with a reciprocating traverse. Patterning and rubbing causes damage of packages. The precision winding package shows poor stability during unwinding and handling. Due to unstable package character, the rate of unwinding is lower.