Patent ID: 7537717

Claim:
A method of manufacturing a two-layer roll having a foamed elastic layer provided on a core, and an elastic layer provided on the foamed elastic layer, the method comprising the steps of: forming the elastic layer, which has a length of 200 mm to 400 mm and outside diameter of 16 mm or less, by use of a cylindrical mold holding a first cylindrical member used to form an outer cylindrical surface of the elastic layer, the first cylindrical member being manufactured by means of machining a solid member, and the first cylindrical member having an inside-diameter error of ±0.02 mm or less and an axial straightness deviation of 0.02 mm or less; forming a solid primary layer, which has a length of 200 mm to 400 mm and is to be foamed into the foamed elastic layer, on the core by means of side extrusion; setting the formed elastic layer and the core having the solid primary layer formed thereon in a second cylindrical member of a foaming mold, the second cylindrical member having an inside-diameter error and an axial straightness deviation substantially equal to those of the first cylindrical member; and foaming the solid primary layer into the foamed elastic layer within the foaming mold including the elastic layer and the core to form the two-layer roll having the foamed elastic layer and the elastic layer, the foamed elastic layer and the elastic layer having a length of 200 mm to 400 mm.