Filter system for molten plastic

摘要

An inlet plate is normally connected to an extruder and formed with an inlet port for supplying a molten synthetic resin under pressure to the port and an outlet plate is normally connected to or part of a mold and is formed with an outlet port in line with and confronting the inlet port for receiving the molten synthetic resin. A movable filter support engageable snugly between the plates at the ports thereof is formed with at least two laterally offset cavities each having an inlet side against the inlet plate and an outlet side against the outlet plate. This support element can be displaced between at least two respective positions in each of which one of the cavities is aligned between the ports for flow through the one cavity therebetween. A respective filter unit in each of the cavities has a plurality of separate cells each having an outside exposed to flow from one of the ports and an inside exposed to the other of the ports.