The separator is also sometimes referred to as the dehairer. A series of rotating cylinders clothed in fine metal spikes can separate fine fibres from courser fibres and vegetable matter not removed either by hand or by the tumbler. In principle, finer fibre will follow the course of the rotating cylinders, whilst the less flexible courser fibre will fall off the rollers and into the collection chambers below.
A fine mist of fibre exits from the final cylinder into a collection bin, ready for carding. Cylinder speeds are variable so a bit of skill and patience is required to judge the optimum speeds for the best quality with a minimum of loss. Fibre with a comfort factor of over 95% as well as baby fleece will not benefit from this process. It is an extremely slow and time consuming process.