Patent ID: 8506277

Claim:
A cylindrical core for manufacturing an endless belt-shaped body, the cylindrical core comprising: a cylindrical portion having two axial ends, an outer surface and an inner surface, the cylindrical portion including a cylinder whose cylindrical shape is not maintainable without support when the outer surface thereof is orthogonal to the direction of gravitational force; and flange portions that are detachably mounted on both axial ends of the cylindrical portion, wherein a coating film forming resin solution formed onto the outer surface or the inner surface of the cylindrical portion in a state in which the flange portions are mounted on the cylindrical portion, the coating film forming resin solution being adaptable to solidify when heated, the flange portions are configured to be removable following solidification of the coating film forming resin solution, thereby forming the endless belt, and wherein the flange portions have a step in a circumferential edge portion thereof, a radius of the step being less than a radius of the flange portions, a depth of the step being defined by a difference between the radius of the flange portions and the radius of the step, and the depth of the step of the flange portions is greater than a thickness of the cylindrical portion.