What are the design principles and functions of the rubber extruder screw?

1. Design principles of rubber extruder screw
The design of the rubber extruder screw is based on the characteristics of the rubber material produced. Its design principle aims to compress, shear, mix and plasticize the rubber material through the rotation and specific structure of the screw, so as to achieve continuous extrusion molding of rubber. Specifically, the design of the screw needs to consider the following aspects:

Material properties: Different types of rubber materials have different fluidity, melting point and viscosity, which directly affect the design parameters of the screw, such as the number of thread heads, compression ratio, lead, etc.
Process requirements: According to the shape, size and performance requirements of rubber products, design a suitable screw structure to ensure stability, uniformity and efficiency during the extrusion process.
Equipment matching: The design of the screw needs to match other components of the extruder (such as barrel, die head, etc.) to ensure the coordinated operation of the entire extrusion system.
2. Functions of rubber extruder screw
The main functions of the rubber extruder screw include:
Conveying function: The screw conveys the rubber material from the feed port to the end of the extruder through rotation to achieve continuous supply of rubber material.
Compression function: In the compression section of the screw, the rubber material is squeezed by the screw thread, the volume is reduced, the density is increased, and the density and plasticity of the rubber material are improved.
Shearing and mixing function: The rotation and specific structure of the screw cause the rubber material to be sheared and mixed during the extrusion process, which helps to uniformly plasticize the rubber material and improve the quality of the extrudate.
Plasticizing function: Under the heating and mechanical action of the screw, the rubber material gradually softens and turns into a viscous flow state, thus having good extrusion performance.
Metering function: In the metering section of the screw, the rubber material is delivered to the die head at a stable flow rate and pressure, ensuring the size and shape accuracy of the extrudate.