The screen changer is a manual or automatic switching device comprising one or more screens for filtering foreign particles and impurities when the plasticizing material flows through the screen.Manual screen changerManual screen changer, as the name suggests is directly by manual manual to switch network equipment. Manual screen changer has a small size, low cost, etc., but its shortcomings are also obvious: slow speed, generally need to stop for network, due to friction and sealing performance