The single-column screen changer (primarily a single-column, dual-station hydraulic type) serves as the core melt filtration component in cast film extrusion lines. Installed between the extruder and die head (or melt pump), it enables rapid screen changes without production stoppage, provides pressure-stabilizing sealing, and offers low flow resistance. Compatible with thermoplastic materials like PP/PE/PET, it ensures stable film thickness and appearance while guaranteeing continuous productio