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The�screen�is�constructed�with�3�layers:�the�sieve�cloth�layer,�the�middle�layer�and�the�support�layer.�Three�layers�are�bonded�firmly�by�special�glue�under�high�temperature.�The�design�of�multi-layers�enhances�the�integral�strength�of�the�screen�and�prolongs�its�lifetime.�Moreover,�different�meshes�from�each�layers�matched�accurately�and�reasonably,�making�the�separating�effectiveness�better,�which�not�only�ensures�the�strength,�but�also�enlarges�the�effective�area�of�the�screen.