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Extruder Screen
Extruded ScreenTypically in all the extrusion processes, involving plastic materials, the melt is passed through wire mesh screens on their way to the die. This provides filtering as well as improved mixing. But some times the screens are known to introduce process variables, elevating back pressure and melt temperature along with case of a reduction in output. Screens are held together by breaker plate with holes or slots, that forms a seal between the die and the extruder. A tiny amount of pressure is added by the clean screens, to the resistance of the head. The amount of the contamination trapped by them provides the big pressure variable. The image of extruder screens are shown here:

Material for Extruder screen
When it comes to choosing the material for extruder screen one needs to be very careful. Steel is a popular material used in extruder screens. Though Stainless steel costs more but is used on some plastics extrusion for avoiding typical problems associated with rust. Nickel alloys are also used in screens to avoid the problems with regard to corrosion from fluoropolymers and PVDC.

What's dirtying your Extruder screens?
Dirty screens are a good indicator of what goes through an extruder. Once a processor is able to trap contaminants or gels, a question may be asked from where they have came from in the first place. It’s easy to blame the resin supplier. But gels, that are elastic, and slide through the finest screens, can be produced in resin plant or by an extrusion process. If there is many gels at start-up and then they quickly decrease, they may probably be home-grown, and not at all a resin maker’s fault. However, in case they start up right away and stays consistent for considerable hours, there is chance that they have come in with the resin.


Tips for Better performance of screens
Types of Extruder Screens
Extruder screens typically comes in a vast range of shapes and sizes. Some of the most popular shapes are described here:
Types of Extruder Screens
Extrusion Equipment
Extruder Screw
Extrusion Dies
Extruder Barrel
Extruder
Feed System
Extrusion Press
Extruder Screen

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