Yarn Evenness in Open-End Spinning

Open-end yarn is said to have a better evenness than ring yarn, but the truth of this statement depends on the error wavelength. It is shown that errors are reduced when the error wavelength in the yarn is less than the circumference of the collecting surface. In practice the main advantages in open-end spinning as far as evenness is concerned derive from the suppression or avoidance of drafting waves and the manufacture of large packages.