Single-screw machine and twin-screw machine: one is a s […]
Single-screw machine and twin-screw machine: one is a screw and the other is two screws. It is driven by a motor. The power varies with the screw.
The main force of the twin-screw compressor single screw and barrel is not stable, and it is affected by the radial force of the axial force. The axial force must be from the flat constant piston. The bearing life is short, and there is high frequency noise when the screw is engaged.
The single screw unit operates with less noise, but the single unit has a smaller capacity. The twin-screw unit has a large cooling range and the unit performance is basically similar. Therefore, the twin-screw unit is currently used more on the market.
At present, the single-screw extruder is the most widely used, and is suitable for extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, the shearing of the material is relatively uniform, the conveying capacity of the screw is larger, the extrusion amount is relatively stable, the material stays long in the barrel, and the mixing is uniform.
Price: single screw extruder is simple in structure and low in price; twin screw structure is complex and high in price
Plasticizing ability: single screw is suitable for plasticizing extrusion of polymer, suitable for extrusion processing of pellets. The shear degradation of the polymer is small, but the residence time of the material in the extruder is long; the twin screw has good mixing and plasticizing ability, and the material has a short residence time in the extruder, which is suitable for powder processing. Huahong Answer
Processing capacity and energy consumption: twin-screw extruder has large output, fast extrusion speed, low energy consumption per unit of output, and single screw difference.
Operational aspects: single screw operation is easy, process control is simple; twin screw operation is relatively complicated, and process control requirements are high.