Double Plunger Screen Changer

The Double Plunger/Piston Screen Changer is a sophisticated, hydraulically operated melt filtration device used in plastic extrusion to ensure continuous production without line stoppage for filter replacement. It features two parallel plungers, each holding a screen filter; one plunger remains in the melt flow path to maintain filtration while the other is hydraulically retracted for quick screen change, venting, and reinsertion. This "one working, one changing" design, utilizing metal-to-metal sealing, prevents leakage and pressure fluctuations, significantly enhancing final product quality, reducing downtime, and increasing extruder life, making it essential for high-precision, high-output applications like pipe, sheet, and masterbatch production.