Filter screen exchanging apparatus for plastic extruder

摘要

A filter screen exchanging device having a pair of parallel slide plates 12 disposed in branched passages DK, EL of a plastic resin extruder 10. Each slide plate has a shouldered hole 14 on one side accommodating a breaker plate 15 having a plurality of flow nozzles 20, a filter screen 17, and a threaded screen cap 18 having a plurality of trapezoidal apertures therein. The other side of each slide plate is blind, and the plates are alternately transferred for screen and cap exchange by hydraulic cylinders 13. The extruder operation is thus continuous, the breaker plate is not exchanged with each screen and cap replacement, and the screen mounting arrangement is designed to minimize air entry and resin leakage during slide transfer.