From the perspective of motion principle, the same-direction meshing and opposite-direction meshing and non-meshing types in Twin Screw Extruders for Powder Coatings are different.

1. Co-rotating intermeshing twin-screw extruder
There are two types of extruders of this type, low-speed and high-speed, the former mainly used for profile extrusion and the latter for specialty polymer processing operations.
(1) Close meshing extruder. Twin Screw Extruders for Powder Coatings manufacturers tell you that low-speed extruders have a closely intermeshing screw geometry, where the flight profile of one screw closely mates with the flight profile of the other screw, a conjugate screw profile.
(2) Self-cleaning extruder. Twin Screw Extruders for Powder Coatings manufacturers tell you that high-speed co-rotating extruders have a closely matched screw profile. This kind of screw can be designed to have a relatively small screw gap, so that the screw has a closed self-cleaning effect. This twin-screw extruder is called a compact self-cleaning co-rotating twin-screw extruder.
2. Counter-meshing twin-screw extruder
The gap between the two screw grooves of the closely intermeshing counter-rotating twin-screw extruder is very small (much smaller than that in the co-rotating twin-screw extruder), so positive conveying characteristics can be achieved.
3. Non-intermeshing twin-screw extruder
The center-to-center distance between the two screws of the non-engaging Twin Screw Extruders for Powder Coatings is greater than the sum of the radii of the two screws.