Extruder is one of the types of plastic machinery, which originated in the 18th century.
According to the material flow direction of the die head and the angle between the center line of the screw, the extruder can divide the die head into right angle die head and oblique angle die head.
The screw extruder relies on the pressure and shear force generated by the rotation of the screw, which can make the material can be fully plasticized and uniformly mixed, and formed through the die. Plastic extruders can be basically classified into twin-screw extruders, single-screw extruders, and rare multi-screw extruders and screw-less extruders.