| 摘要 |
PURPOSE:To improve the mechanical strength and the gas-diffusing performance of the flat part of an electrode plate, and increase the moldaility of the protruding parts of the electrode plate by making the length of carbon fibers contained in the flat part large than that of carbon fibers contained in the protruding parts. CONSTITUTION:At first, an aqueous dispersion liquid prepared by properly dispersing long carbon fibers 6A, is drawn through a filter so as to form a mat of the carbon fibers 6A on the filter. Next, after blocks are placed on parts of the mat of the carbon fibers A which correspond to gas flow paths 4, an aqueous dispersion liquid of short carbon fibers 6B is poured into spaces which correspond to projections 5, and filtered through both the above filter and the mat of the carbon fibers A so as to form mats of the carbon fibers 6B on the above mat of the carbon fibers 6A. Then, thus obtained body, after being dried, is impregnated with a binder 2 such as a phenol resin, and pressed and heated by heat press or something similar until the thickness of a flat part 3 and the height of the projections 5 become given dimensions so as to harden the binder 2. After that, thus obtained body is sufficiently carbonized by being heated at high temperature in an atmosphere of an inactive gas or in vacuum, thereby making a porous electrode plate. |
