PSI-Polymer Systems, Inc. Hydraulic Screen Changer (HSC)

Long considered the workhorse of polymer melt filtration, Hydraulic Slide Plate Screen Changers (HSC) are an efficient, economic filtration solution for film, sheet, pelletizing and a host of other applications able to tolerate a momentary process disruption. The design uses a two-position reciprocating slide plate to rapidly move screen packs in and out of the melt stream ‘on-the-fly’. During a screen change with the extruder operating, the slide plate coasts beneath the seals and head pressure is momentarily relaxed. Once the slide plate is in position with the new screen online, head pressure is instantly reestablished, pressing the seals tightly against the slide plate for leak-free performance.
The heart of the system is PSI’s patented, life-time warrantied pressure-activated sealing system. Unlike other hydraulic screen changer designs that require annual tear down and replacement of a PTFE pressure ring, PSI’s patented expandable ring is all steel and never wears out. The no-maintenance design minimizes component wear to achieve long service life and never requires operator adjustment.
Learn more at: psi-polymersys...