Method of manufacturing two-layer roll and method of manufacturing cylindrical member

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 to form the two-layer roll having the formed elastic layer and the elastic layer, the formed elastic layer and the elastic layer having a length of 200 mm to 400 mm.