Extruders are built with a variety of different compone […]
Extruders are built with a variety of different components, and the design of the screw plays a crucial role in determining the output quality. The screw design plays a crucial role in determining the plasticization characteristics of the material. A screw's pitch is also important, as the helical grooves on the barrel and the worm thread on the screw's head influence the plasticized material's elongation characteristics.
Another component of an extruder barrel is the tempering section. This section is positioned adjacent to the expansion screw section. It is responsible for regulating the temperature of the plasticized mass. This is accomplished by two temperature control devices located in the screw's cylinder chamber. One of these devices will automatically adjust the temperature of the material being extruded through the extruder barrel.
Another type of extruder is twin-screw. A twin-screw extruder features two screws arranged parallel to each other in a cylindrical barrel. Twin-screw extruders are commonly used for processing powder blends. Twin-screw extruders also feature kneading elements.
Twin-screw extruders feature positive displacement capability. This increases material flow rate and reduces the sensitivity of flow rate to pressure. They also have better temperature control. This is important for plastics that need heat-sensitive properties.