Method for filtering a screen changer and a screen changer

摘要

The screen changer of the invention is structured such that a material discharge passage formed in a housing is brought into communication with the in-flow passage of a through passage formed in the housing through the upstream chambers of through passage portions respectively formed in slide bars, and the molten materials that have passed through the in-flow passage in the initial operation of the extruding machine are discharged into the above material discharge passage, thereby being able to remove the mixtures remaining in the extruding machine prior to the normal operation of the extruding machine.