DREF friction spinning

Friction spinning or DREF spinning is a textile technology that is suitable for spinning coarse counts of yarns and technical core-wrapped yarns. DREF yarns are bulky with low tensile strength, making them suitable for blankets and mop yarns. They can be spun from asbestos, carbon fibres and are capable of being made into filters for water systems. Yarns such as Rayon and Kevlar can be spun using this method. The technology was developed around 1975 by Dr. Ernst Fehrer.