Why is the combination of parallel twin screws and barrels more efficient than single screws?

Compared with single screw, conical twin screws and cylinders are more efficient, mainly due to their unique design and working principle. The specific advantages are reflected in the following aspects:

1. Forced conveying mechanism to reduce material backflow
Single screw: Material conveying mainly depends on friction, which is easy to cause backflow due to excessive head pressure, reducing production efficiency. Especially when processing powder, fiber or highly filled materials, the feeding performance of single screw is limited.
Twin screw: Adopting the principle of positive displacement conveying, the two screws mesh with each other to form a closed screw groove, forcing the material to move forward and avoid backflow. Even under high head pressure, it can still convey stably.

2. Stronger mixing and plasticizing ability
Shearing and dispersion: The threaded elements of the twin screw can be flexibly combined to achieve efficient mixing of materials through shearing, stretching and compression.
Homogenization effect: The melting section and plasticizing section of the twin screw are more finely designed, and the heat conduction is uniform to avoid local overheating or insufficient plasticization. However, due to structural limitations, the mixing uniformity of the single screw is poor.

3. Flexible segmented design and modular configuration
Building block structure: The barrel and screw of the twin screw adopt segmented combination design, and the function of each segment can be adjusted according to the material characteristics (such as viscosity, heat sensitivity). For example, adding a venting section can quickly remove volatiles and improve the quality of the finished product.
Multi-process integration: The twin screw can complete feeding, melting, venting, mixing and extrusion at the same time, while the single screw needs to be processed step by step, which is less efficient.

4. High speed and high torque output
Speed ​​and energy consumption: Twin screws usually have higher speeds and lower energy consumption per unit output. For example, under the same production capacity, the energy consumption of a twin screw is only 50%-60% of that of a single screw.
Torque distribution technology: The use of high-torque gearboxes (such as bilateral symmetrical drive technology) ensures stable power output, which is suitable for processing high-viscosity or heat-sensitive materials.

5. Adapt to complex processes and materials
Material compatibility: Twin screws can handle a variety of materials, including glass fiber reinforcement, flame retardant, high filler (such as 75% calcium carbonate) and thermosetting plastics, while single screws have narrower applicability.
Temperature control: The twin screw barrel segmented heating/cooling system is more precise to avoid overheating and decomposition of materials.