The extrusion process
basically consists of a feeding mechanism, a compounding section and cooling. The material is fed into a rotating mechanism, usually a screw device encased by a barrel. The screw is configured with flights or nodes that exert work on the molten mass as it passes through the extruder.
Extruders designed to manufacture powder coatings
employ a single screw or twin-screw mechanism. Single screw types have flights along the circumference of the screw. These flights convey the mixture into pins that radiate from the interior of the barrel. This creates shearing of the material that in turn melts the mass and affects the distribution and dispersion of the components. The molten mass exits the barrel and is then cooled and broken into flakes.