Patent ID: 8776373

Claim:
A method for producing a disc roll, comprising the steps of: forming into a plate form a slurry raw material to obtain a disc member base material, said slurry raw material comprising an inorganic fiber, mica and a kibushi clay containing particle components that have a particle size of 5 μm or larger in an amount of 30% by weight or less based on the weight of the kibushi clay; stamping out a plurality of annular disc members each defining a hole and having a peripheral surface, from said disc member base material; and fitting said plurality of annular disc members on a rotary shaft by insertion through the holes and fixing said disc members thereon to obtain a disc roll, whereby the peripheral surface of said disc members serves as a conveying surface of the disc roll, wherein the kibushi clay is either elutriated or subjected to a wet sizing separation purification process, and the kibushi clay is configured to be sintered by heat applied thereto upon use of the disc roll to give a hardening action, wherein said kibushi clay has a content of impurities of 10% by weight or less based on the weight of the clay, wherein said inorganic fiber is present in an amount of 20 to 40% by weight based on the total weight of said disc members, and said kibushi clay is present in an amount of 20 to 40% by weight based on the total weight of said disc members, and wherein said mica is present in an amount of 20 to 35% by weight based on the total weight of the disc member.