Extruder screens used in various applications, including blown film production, are composed of different components that work together to provide effective filtration of the melt. Here are the main components of an extruder screen:
Screen Discs or Mesh: The screen discs or mesh form the main filtering element of the extruder screen. They are typically made of stainless steel or other heat-resistant materials. The screen discs can be circular or square in shape, and they feature a fine mesh of woven wires or perforated metal sheets. The mesh size determines the level of filtration, allowing the desired melt to pass through while trapping contaminants and particles.
Support Structure: The support structure provides stability and strength to the extruder screen. It typically consists of a metal ring or disc that holds the screen mesh in place. The support structure is often made of stainless steel to withstand the high temperatures and pressures encountered in extrusion processes.
Rim or Frame: Some extruder screens may have a rim or frame that surrounds the screen discs and provides additional support and sealing. The rim or frame helps to secure the screen discs within the screen pack or housing and ensures proper alignment and sealing with the extruder.
