Double Stage Extrusion

There are two types of a double stage extrusion. A double stage single screw apparatus and a composition of a twin screw extruder and a single screw extruder. The extruders are valuale in the extrusion of plastic resins. While in a highly viscous state with minimum blow-back, the first stage includes positively advancing the resinous material. With the use of a screw, the second stage encompasses mixing and the ultimate discharge of the resin. By providing precise metering and discharge of the molten resin, through the die over, there is a wide variation of die pressures.