Filter cloth

A solid-liquid filtration filter cloth which is intended for use in a pressure filter based on diaphragm extrusion which comprises at least two filter chambers and in which the filter cloth is guided through the filter chambers arranged one after the other in the direction of movement of the filter cloth so that in the filter chambers, the opposite sides of the filter cloth are alternately against the slurry to be filtered which contains liquid and solids,

• the filter cloth being symmetrical in respect of the filtering ability,
• the filter cloth comprises a middle layer the both surfaces of which are provided with protective layers which form the outer surfaces of the filter cloth and are denser than the middle layer,
• the protective layers are batt fibre layers attached to the middle layer by needling,
• the middle layer has a woven structure comprising machine direction threads and transverse threads and withstanding tensile stress thus allowing the solids separated from the slurry in said filter to be conveyed out of the filter chambers by means of the filter cloth.