Backflush Type Continuous Screen Changer

The Backflush Type Continuous Screen Changer is a sophisticated, fully automatic filtration system, typically featuring a double-piston design with four screen cavities to ensure uninterrupted polymer melt flow during the contamination removal process, making it ideal for highly contaminated materials like recycled plastics. When a pre-set pressure drop is reached, the system automatically shifts a contaminated screen out of the main stream, reverses the melt flow using a small portion of clean polymer to purge contaminants off the screen surface (the "backflush" action), and then reintroduces the now-cleaned screen; throughout this entire self-cleaning or screen-changing sequence, at least 75% of the filtration area remains online, minimizing pressure fluctuation, maximizing production uptime, and significantly extending screen life.