Multilayer extruder screen packs are specialized filtration devices used in the plastics and polymer processing industry. They are designed to remove impurities and contaminants from the molten plastic material during the extrusion process.
These screen packs consist of multiple layers of wire mesh screens stacked together in a sandwich-like configuration. Each layer of the screen pack contains a wire mesh with a specific mesh size or opening size. The mesh sizes can vary depending on the desired filtration requirements and the type of material being processed.
The multilayer design of the screen pack offers several advantages. Firstly, it provides a progressively finer filtration system. The larger openings or mesh sizes are placed at the upstream side of the pack to capture larger contaminants, while the finer mesh sizes are positioned towards the downstream side to trap smaller particles. This arrangement ensures effective filtration while minimizing pressure drop and maintaining a consistent flow rate.
Another benefit of the multilayer design is its ability to trap and retain contaminants throughout the screen pack’s service life. If a single layer becomes clogged or damaged, the remaining layers continue to provide filtration, preventing the extrusion process from being interrupted.
Multilayer extruder screen packs are typically installed in the melt channels of extrusion machines. The screens are held in place by a frame or support structure and are easily replaceable when they become worn or clogged.
One example of Multilayer Extruder Screen Packs
materials: standard stainless steel 304.
specifications
- 3 layers of mesh : 50/325/50
- first layer 50 mesh x 0.18 mm,
- second layer 325mesh x0.035mm,
- third layer 50 mesh x 0.20 mm.
- The screen packs with aluminum frame
- inner diameter 140-141mm,
- outer diameter 151mm.
