Single Screw Extruder for Polymers

Single screw extruders usually work on high velocities. When the speed of the screws is increased, it causes higher friction and subsequently, the temperature of the polymer increases due to friction in screw length. Sometimes, due to the heat caused from friction, it may cause burning and chemical disintegration of the polymer. One way to prevent this problem, is to use a cooling system. A single-screw extruder is not suitable for polymers with thermal-mechanical sensibilities (such as PVC), because of debility in thermal transmission of polymers, there are also problems with the consistency of melt, especially in the metering zone.