For low energy blending of a wide range of dry and semi wet materials used in chemical, pharmaceutical, food and allied industries. The mixer consists of an orbiting helical screw rotating on its axis in a conical vessel. The material is carried upwards as well as rotated around the conical vessel. Reversing the direction of the screw aids discharge of material. Capacities are available from 100 kgs to 2000 kgs with various optional attachments.