Single Screw Extruder (Compound Extrusion)

    1. Reciprocating Screw Extruder with Melt PumpThe melt pump used by this reciprocating screw machinery is mounted between main extruder and die head. It is capable of further homogenizing materials, ensuring stable pressure in the extruding process, lowering extruding temperature of the material, reducing power consumption as well as improving stability of the compound extruder and quality of the product.
    1. Two-stage Reciprocating Screw ExtruderThis machine is easy to dismantle and clean. Its spare parts can all be repaired in a fast, convenient and safe way. Since the pressure of the barrel is very low and internal friction is very small, our mixer extruder is able to work stably with little noise.
    1. Reciprocating Screw Extruder for ThermoplasticsThe impeccable cooling and heating systems as well as the accurate temperature measurement ensure the unique role of our reciprocating screw extrusion system in processing temperature and heat sensitive materials.


The single screw extruder can act as a compound extrusion machine, and its extrusion screw can circumrotate and oscillate axially. The spiral of kneading screw is broken into 3 gaps per revolution, which results in kneading flights. There are 3 rows of pins on the barrel lining. The moving kneading flights cooperate with the stationary pins, thus guaranteeing excellent dispersive and distributive mixing effects. This reciprocating screw extruder is designed for compounds sensitive to shearing and temperature.

By now, our company has mounted hundreds of compounding extrusion systems throughout the world. 7 sets of single screw extruders have been applied in our masterbatch company. Owing to the advanced production equipment, our masterbatch features excellent dispersive ability and high viscosity.

Owing to our consistent efforts, our company has filled a number of blanks in domestic market. For this reason, we have won the patent certificate and high-tech company certificate issued by the government. Our reciprocating screw machinery also has gained the high-tech product certificate.

The SJW industrial mixer extruders is able to provide optimum kneading effects for various materials, such as wire and cable compound, masterbatch, engineering plastic, engineered elastomer, thermoset plastic, flame retardant, PVC compounding as well as powder coating and toner. It is a great replacement of conventional single screw plastic extruders, etc.


1. The reciprocating single screw extruder can be used for processing materials at the softening temperature. The melt temperature is relatively low. This product comes with optimal temperature control and is free of temperature fluctuations.
2. It supplies mild shearing effects without shear spikes.
3. This reciprocating screw extrusion system has strong self-cleaning ability.
4. It also delivers excellent dispersive or homogenous mixing effects without destroying the structure of fine filler. Polymer matrix can be equally treated. Additionally, there is no dead compounding zone.
5. Our mixer extruder has the high filling rate.
6. It is capable of effectively blending liquid components.
7. This single screw extruder is suitable for various materials without the need to change hardware.
8. It is characterized by low energy input.
9. The barrel can be axially opened for easy cleaning and fast maintenance.
10. Spare parts, like screw element, barrel neck bush and pin, can be changed individually.

Working Principle

The SJW reciprocating single screw extruder differentiates from the traditional single and double screw extrusion equipment in respect of working principle. The spiral of the kneading screw is disconnected by 3 gaps per revolution, giving birth to kneading flights. There are 3 rows of stationary kneading pins on the barrel lining. The screw is able to circumrotate and reciprocally move in the axial direction. Owing to such a unique mode of motion, materials are sheared between pins and kneading flights. They are transported in a reciprocating way. The combination of the axial and radial kneading greatly guarantees optimal dispersive and distributive compounding effects. By different arrangements of screw elements, the working pressure can be stabilized and the temperature will not fluctuate. Thus, materials can be free from degradation in the barrel.

With the help of the water cooling system inside the barrel and screw, the processing temperature can be precisely regulated and it is much lower than those of other mixing systems. Materials can be processed at their softening temperature. Accordingly, the use of the single screw extruder will ensure less degradation of materials and premium quality.