Multi-Layer Filter Packs is selected when an assembly or process calls for filtering polymer melt in extruders and screen changers with packs of several woven mesh layers graded from coarse to fine. This application guide to the Extruder screen pack convention type covers concrete end-uses, the specification checklist, correct installation, and where an alternative mesh or filter medium performs better.
Typical Applications for Multi-Layer Filter Packs
Where Multi-Layer Filter Packs is specified and bought:
- Plastic extrusion: film, pipe and profile extruder screen packs.
- Recycling: melt filtration of contaminated regrind.
- Fiber spinning: spin-pack filters.
- Rubber & compounding: strainer packs.
How to Specify Multi-Layer Filter Packs for Your Application
- Layer sequence: E.g. 20/40/80/40/20 mesh to balance strength and filtration.
- Diameter & fit: Match the breaker plate or screen changer slide.
- Bonding: Spot-welded, rimmed or loose packs.
- Standard: Quote Extruder screen pack convention and the size designation from the table on the product page, plus any value you changed in the technical drawing.
Handling & Installation Practice
- Fit packs with the finest layer protected on both sides.
- Log pressure and change packs at a fixed rise.
Common Selection Mistakes with Multi-Layer Filter Packs
- Too fine packs causing high melt temperature.
- Reversed packs.
Where Multi-Layer Filter Packs Is Not the Right Choice
Not for low-viscosity liquids where a cartridge is simpler.
