Screen changer optimized for recycled material streams

By optimizing melt-filtration capabilities and separating impurities, a continuous backflush screen changer (CSC/BF) can be of use to extruders and pelletizers running recycled materials. PSI-Polymer Systems Inc. says the CSC/BF extends the the life span of the screen pack filters compared to standard styles of screen changers through a unique design. Responding to a widening industry trend of running recycled materials, which can quickly clog screens, PSI’s continuous backflush technology divides material into two melt streams each with two filtration cavities. When contaminant-level increase and upstream pressure rises, the machine’s PLC control automatically actuates each piston to its backflush position, allowing pressure to push contaminants off the dirty screen pack. Contaminants are purged out of ports in the housing, and the clean screens are returned to their original position.

Operating at process temperatures to 700°F, the CSC/BF features guaranteed leak-proof operation to 10,000 psi, and since there are no seals or contact parts, PSI offers a five-year warranty against melt leaks. Available sizes range from a screen diameter of 4.58 inches (116 mm) to 9.07 inches (230mm). PSI-Polymer Systems Inc., Hickory, NC, U.S.A.; +1 828 345 6264; www.psi-polymersystems.com.