Cylindrical core for manufacturing endless belt-shaped body, and method for manufacturing endless belt-shaped body

1. 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.

2. The cylindrical core according to claim 1 , wherein

the cylindrical portion has a thickness equal to or less than 1/100 of a diameter of the cylindrical portion.

3. The cylindrical core according to claim 1 , wherein

the cylindrical portion is made of a metal belt.

4. The cylindrical core according to claim 1 , wherein

the flange portions are made of a metal material or a thermally-resistant resin material.

5. The cylindrical core according to claim 1 , wherein

the flange portions are made of a metal material having a thickness of from 2 mm to 20 mm.

6. The cylindrical core according to claim 1 , wherein

a diameter inside the step is slightly smaller than an inside diameter of the cylindrical core.

7. The cylindrical core according to claim 1 , wherein an arithmetic average of roughness of the outer surface or the inner surface of the cylindrical portion is in the range of 0.2 μm to 2 μM.

8. The cylindrical core according to claim 1 , further comprising a plurality of tie rods, the plurality of tie rods adapted to hold the flange portions together.

9. The cylindrical core according to claim 8 , wherein the plurality of tie rods extend along the axis of the cylindrical portion and are attached to the flange portions.