Screen changers are manual or automatic switching devices consisting of one or more filters for filtering out foreign particles and impurities during the plasticized material flow filter. It is well known that the cleanliness of the recovered material and the technical use of the final recycled particles determine the technical standard of filtration of the filter system. For different melt filtration loads, conventional uninterrupted single plate double station or double piston double station screen changing filter systems are used to achieve excellent melt filtration performance.