Blinding of the cloth is when undersized particles get stuck in between the cloth strands, decreasing drainage rates and essentially rendering the filter cloth null-in-void. In processes like Vacuum Belt filtering and Belt press dewatering the cleaner a cloth on the return the longer the belt life will become. Blinding can also cause cloth failure as the particles that are stuck in between the cloth strands may erode the strand to a point where fraying may occur. Thus an efficient cloth washing system is important to maintain your filter cloth and extend your filter cloth life.
An internal brush spray bar is an efficient and effective way of washing a filter cloth. The spray bar is mounted over the frame of the machine. Nozzles on the spray bar are then pointed in the direction of the filter cloth. The top spray bar assists in loosening any particles that are partially stuck in the cloth, behind the top spray bar there is another spray bar spraying through the bottom of the cloth, this spray bar washes residual product out of the cloth loosening and washing away the rest of the particles out of the cloth.