Type Selection

Manual screen changer: suitable for small scale or low production line (e.g. laboratory equipment), low cost but need to stop operation, easy to produce waste.

Hydraulic automatic screen changer: driven by hydraulic system, screen changing time<2 seconds, strong sealing, suitable for large-scale continuous production (e.g. industrial PE foam film production line).

Mesh belt type automatic screen changer: relying on the pressure-driven mesh belt continuous screen changing, suitable for film, optical fiber and other long process products production, but the initial investment is higher.

Screen configuration

Mesh selection: adjust the mesh size according to the product requirements. For example, ordinary PE foam film can choose 100-200 mesh screen, while high transparency products need more than 200 mesh screen.

Multi-layer combination: Adopt “coarse mesh + fine mesh” structure (e.g. 20/40/60 mesh), which can prolong the life of the filter and prevent clogging. For example, in PE wood-plastic composites production, a three-layer screen combination can extend the screen replacement cycle to 800 hours.

Temperature and Pressure Resistance

Temperature range: PE foaming process temperature is usually 160-230 ℃, need to choose the temperature ≥ 250 ℃ screen changer (such as alloy steel material).

Pressure bearing: choose the screen changer according to the extruder pressure. For example, XPS foaming line needs screen changer to bear 20-25MPa pressure, while microcellular foaming may need 30-50MPa.

Material and sealing

Body material: recommended alloy steel (such as CPM tool steel) or titanium alloy, wear resistance and corrosion resistance is better than ordinary carbon steel.

Seal design: Adopt pressure adaptive sealing technology (e.g. hydraulic plate screen changer), which can solve the problem of high-temperature melt leakage and extend the sealing life to more than 5000 hours.

Automation and maintenance cost

Automation function: optional automatic temperature control, material pressure measurement and control alarm system to reduce manual intervention. For example, the screen changer with stroke position sensor can realize screen changing accuracy ±0.1mm.

Maintenance cost: The hydraulic system requires regular replacement of hydraulic oil (every 2000 hours), while the mechanical seal structure has a lower maintenance cost, but needs to be checked for wear and tear every 500 hours.

Heiko Mesh Belt Continuous Screen Changer

Model: HK-NB300

Features: mesh belt life ≥1000 hours, pressure fluctuation<0.5MPa, support non-stop screen changing.

Application: Highly polluted, high output PE extrusion system (e.g. sensitive process).