DIAPHRAGM OF PREDEFINED POROSITY AND METHOD OF MANUFACTURING THEREOF AND APPARATUS THEREFOR

摘要

The invention relates to a porous separator deposited on the cathode body of a diaphragm electrochemical cell, characterised by a predefined roughness profile obtained by vacuum sucking of a suspension containing fibres and an optional particulate material. The degree of vacuum is adjusted in continuous as a function of the percentage of deposited material, preferably by means of a central processing unit acting on the suspension flow. The porosity profile to be obtained is selected depending on the composition of the suspension and the projected industrial operative conditions. The porous separator may be formed by the superposition of a multiplicity of polymer fibre planes comprising primary pores generated by the interconnection of a multiplicity of primary interstices between said fibres, the size of said primary pores having an average value of 2 to 10 µm with a standard deviation not higher than 50 % of said average value.