Extruder is a machine widely used which can process various materials. It has many types generally divided into single screw and double screw. Today I will mainly show you the related knowledge about the double screw extruder.
Extrusion molding is a process which mold the rubber material with certain plasticity continuously out through a mouth shape under certain conditions and then makes it a product with a certain fracture shape. In the process of moving the rubber along the screw, the viscosity and plasticity of the rubber have changed due to the mechanical and thermal effects which make the rubber a viscous fluid. According to the change of rubber material in the extrusion process, the twin screw extruder parts are generally divided into three parts by its function: charging section, compression section and extrusion section.
Compared to the related features of double screw extruder and single-screw extruder, the twin screw barrel manufacturer can learn that double screw extruder has the principle of single-screw extruder: solid transportation, melting, pressurization, pumping, mixing, stripping and devolatilization. But it is not just simple like that.
As a double screw extruder, the reaction process, speed, function, screw configuration and operating conditions build up the inner reaction to make the model helping the shaping process.
The double screw extruder has long-lasting reliability so the world's leading manufacturer of twin screw and barrel manufacturer is committed to produce double screw which can meet the demands of public better. In addition, the transmission box of double screw extruder has great influence, in addition to having big power and high safety factor, the main bearing service life of the century extrusion gearbox can be up to 50,000 hours.
Investigations and researches show that different double screw extruders have specific draw ratio which reflects the specification and performance of each double screw extruder. Different types of double screw extruder have different range of aspect ratio.
For integral double screw, the length-diameter ratio is fixed, generally being 7~18; for the combined double screw, the ratio of length to diameter is variable, some can be up to 36.
Six-sided geometry enabling uniform torque transfer and rapid screw element replacement.
Best suited for:
Powder coating
Frequent material changes
Fast screw configuration changes
Triple flight elements provide strong distributive mixing with lower shear. They are commonly used in melt mixing sections where gentle material distribution is required.
Best suited for:
Melt distribution
Sensitive materials
Low-shear compounding
Transition elements are designed to connect different screw element geometries while minimizing dead zones and material retention.
Best suited for:
Transition between single and double flight elements
Connection between SK and standard conveying elements
Geometry change zones within complex screw configurations
Neutral kneading elements provide strong mixing with minimal conveying effect, ensuring stable residence time and high mixing efficiency.
Best suited for:
High mixing zones
Sensitive formulations
Residence time control
SME elements introduce shallow reverse grooves on conveying flights, generating controlled melt backflow and improving distributive mixing.
Best suited for:
Melt stage mixing
General distributive mixing
Applications requiring good self-cleaning
Precision involute spline ensuring high torque transmission with accurate centering and load distribution.
Best suited for:
High torque extrusion
Engineering plastics
Masterbatch production
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