Working Principle Of Twin-screw Granulator
Solid transport, melting, pressurization and pumping, mixing, stripping and devolatilization, but it is not just that. The research and analysis of twin-screw extrusion theory started late.
In addition, there are many categories, the screw geometry is relatively complex, and the extrusion process is complicated, which brings many difficulties to research and analysis. Generally speaking, the research and analysis of twin-screw extrusion theory is still in its infancy.
This is what is called "more skill than science".
Twin-screw granulator extrusion molding is a process in which the rubber material with a certain plasticity is continuously pressed out through a mouth under a specific environment, so that it becomes a product with a certain cross-sectional shape.
When the rubber moves forward along the screw, the viscosity and plasticity of the rubber undergo certain changes as a result of mechanical force and thermal effects, and it becomes a viscous fluid.
According to the transformation of the rubber material during the extrusion process, the working part of the screw can be roughly divided into three parts: the feeding section, the compression section and the extrusion section.
Co-directional intermeshing twin-screw granulator, this type of extruder has two types: low speed and high speed.
The former is mainly used for profile extrusion, and the latter is suitable for special polymer processing operations.
Self-cleaning extruder.
The high-speed co-directional extruder has a closely matched spiral profile.
This kind of screw can be designed to have a very small screw gap, so that the screw has a closed self-cleaning effect.
This kind of twin-screw granulator is called a tight self-cleaning co-rotating twin-screw granulator.
Close mesh extruder.
The low-speed extruder has a closely meshed screw geometry, in which the shape of the rib of one screw closely matches the shape of the rib of the other screw, that is, the conjugate screw shape.
The center distance between the two screws of the non-meshing twin-screw granulator is greater than the sum of the two screw radii.
Counter-meshing twin-screw granulator, the gap between the two screw grooves of the closely meshed counter-rotating twin-screw granulator is very small, so it can achieve forward conveying characteristics.
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