Patent ID: 8636633

Claim:
A disc roll comprising: a plurality of annular disc members each defining a hole and having a peripheral surface; and a rotary shaft fitted into the holes of said annular disc members by insertion, whereby the peripheral surfaces of said disc members serve as a conveying surface of the disc roll, wherein said disc members comprise an inorganic fiber, mica and kibushi clay having a content of particles with a particle size of 5 μm or larger of not higher than 30% by weight based on the weight of the kibushi clay, the kibushi clay being either elutriated or subjected to a wet sizing separation purification process, and the kibushi clay being 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.