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Wire Mesh Screens Changer
Wire mesh screens changer used in most extruders, are usually square mesh The purpose of wire mesh screens is to filter out contaminants and also to build up pressure in the extruder. 
 
Wire Mesh Screens Changer
 
Pressure in extruders can have dual effect- it can be both good and bad. Automatic screen changer with belt filter helps mixing and is particularly useful if screw speed is high and the residence time of polymer melt in the extruder is not very long. On the negative side, there are certain aspects of pressure that could hamper production rate - More pressure means more resistance to flow through the head and die; thus causing the motor to work harder and leading to an increase in melt temperature coming out of the extruder.
 
Usually extruders of rigid PVC pipe and profiles do not use screens at all. As a fully automatic screen changer,There are operations in screen changer for recycling processes in an increase in melt temperature may require a extrusion screen changer.


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