Now let;s do some study about the comparisons of two kinds of machines. The material of star wheel in se series are resin while the star wheel and screw are meshing and running, it is easy to wear and tear, and the resin bits will drop in the oil in main engine and is easy to lead to high temperature in air compressor and breakdown. While the parallel twin screws extruder has energy-saving motor with the speed of1460 r/min.Single screw plastic extruder, as a kind of common extruder equipment, is used in plastics processing industry.

While the parallel twin screw extruder meshes by the male and female rotor. Because it has simple design and structure and the lower price, alloy screw and barrel china it is widely used, such as SE series single screw extruder. Simply speaking, the first is with one screw, the other is with two. The higher the speed is, the greater the wear is. But both are driven by motors. But it has its limitations and advantages in use. Single screw plastic extruder and parallel twin screw extruder are different. In theory the single one is advanced than the parallel twin type extruder; because it is balanced by the radial force, but parallel twin type balance the rotor;s radial force through the SKF bearing.

The oil film exists between two rotors without direct contact, so the friction is small, and displacement does not change with time. The power varies because of the number of screws. SE plastic extruder compresses air with one single screw and two star wheels, and the threes direct contact with each other, thus leading to the serious fiction between the star wheel and rotor. They are used in different areas and situations to meet different requirements.

The gear and rotor of single type is usually made at home, so the raw materials and processing technology and its manufacturing accuracy cannot be ensured as advanced as theory. There will be great inner leaking in big head, and the quantity of displacement is reduced. The speed of SE series in the main motor is 2,970 r/min, and the minimum is.So the single screw motors tear and wear seriously, operating costs increases.

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