Friction drums, e.g. arrangement of suction holes

Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques > imparting twist by contact of fibres with a running surface > Friction spinning, i. e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum > Friction drums, e.g. arrangement of suction holes

Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques > imparting twist by contact of fibres with a running surface > Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum > Friction drums, e.g. arrangement of suction holes