Construction:
It consists of alternative plate and frame mounted on two parallel support bars.
The pressure can be applied through screw thread so that the plate and frame are rigidly fixed between two end plates.
The frame is open and is used as an inlet for material to be filtered.
Plates has grooved surface which give support to the filter cloth.
The plate and frame are made of non-corrosive material.
Filter cloth is placed at each side of the plate.
Each plates acts as single filtration unit and outlet is connected to common outlet for plate.
Working: (1M)
The slurry is pumped in under positive pressure up to 20 bar and fill each frame.
The filtrate passes through the cloths on opposite sides of the frame and runs down between the studs on the plate surface.
There is an outlet cock in the bottom right hand corner of the frame allowing the filtrate to discharge in to channel.
The solid in the slurry build up to form cake in each frame which will eventually meet in the centre of the frame.
When the process is stopped, the frame is emptied and cycle is restarted.
Thickness of cake can be varied by using frame of different thickness.
Diagram: