Patent ID: 8641939

Claim:
A method for producing a porous carbon sheet, which comprises the steps of: forming a precursor fiber sheet containing short carbon fibers and a thermosetting resin, with a heat and forming treatment, and carbonizing the thermosetting resin contained in a heated and formed precursor fiber sheet formed by the forming step, with a heat treatment, wherein a unit area weight of the short carbon fibers in the precursor fiber sheet is in the range of 15 to 30 g/m 2 and a unit area weight of the thermosetting resin in the precursor fiber sheet is in the range of 30 to 80 g/m 2 , and wherein, in the forming step, the precursor fiber sheet is formed by hot plates having a certain clearance provided between the hot plates, wherein the forming step comprises a heating and pressurizing treatment step using a pair of hot plates positioned to be parallel to each other, and wherein the precursor fiber sheet is a long precursor fiber sheet having a length of 10 meters or more and the long precursor fiber sheet is carried intermittently into a space between the hot plates in the forming step in such a manner that the long precursor fiber sheet is carried into the space between the hot plates with a certain feed length which is equal to or less than the length of the hot plates, subsequently the carrying of the long precursor fiber sheet into the space between the hot plates is suspended and the long precursor fiber sheet is treated with heating and pressurizing using the hot plates, and subsequently a next certain feed length next to the certain feed length of the long precursor fiber sheet is carried into the space between the hot plates being carried out from the hot plates with approximately the same length of the next certain feed length of the long precursor fiber sheet.