Single Screw And Barrel

Single screw extrusion uses one screw within a cylindrical barrel to continuously push plastic through a constant profile die (Figure 12.7). Production rate is typically measured in mass per hour (lb/hour or kg/hour) and is controlled by the screw speed of the machine.In general, the single screw extruder is developing in the direction of high speed, high efficiency and specialization. The twin-screw extruder has good feeding characteristics and is suitable for powder processing. It has better mixing, venting, reaction and self-cleaning functions than the single-screw extruder.Single screw forming extruders are used to manufacture pasta, processed meats, and fillings. Single screw cooking extruder (SSCE) are used to produce dry and semi moist pet foods, expanded snacks, breakfast cereals, puddings, soup and drink bases, gelatinized starch and texturized vegetable proteins.