To lessen the added amount of water to a granulated powder mixture and to inhibit the generation of warpage of the mixture or the generation of distortion of the mixture subsequent to a heat treatment of the mixture by a method wherein with an extrusion molding performed in a molding process, granulated powder, which is led not only from a mixing process but from a granulating process, is used in the extrusion molding.
Activated carbon powder is mixed with a thermosetting resin and a solvent and the powder, the resin and the solvent are kneaded with each other. The amount of the solvent to be added at this time is set in 100 parts weight or lighter of solvent to 100 parts weight of the total amount of activated carbon powder and thermosetting resin. After this kneading ends, the mixture is subjected to a drying treatment to remove the solvent and is ground to granulate into powder of a particle diameter of a prescribed size. That is, by grinding the mixture by a ball mill or the like, the granulated powder is granulated into powder of a mean particle diameter of 420μm or shorter. Then, for performing an extrusion molding on the granulated powder, a coupler is added to the powder and is mixed with the powder. Then, this granulated powder mixture is mixed with water and is subjected to extrusion molding. After the extrusion molding, the mixture is heat-treated in an atmosphere of inert gas, such as vacuum, Ar gas or N2 gas, and the thermosetting resin is carbonized to obtain an activated carbon polarized electrode.
SHIMIZU TAKASUMI
KODAMA KENJI
DAIDO STEEL CO LTD
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