Adding a hydraulic screen changer to a plastic recycling line is an important part of the process. Hydraulic screen changer is a kind of equipment for melt filtration, which is widely used in the processing field of plastics, rubber, chemical fiber and other polymer materials. In the production process, some unqualified products will be produced, which need to be recycled and reused. And plastic recycling is to separate, clean, crush, melt and a series of other processing of unqualified products