Cylindrical sleeve structure, particularly cover for an offset cylinder in a rotary offset printing machine

Abstract From the Canadian patent

A cover layer, for example applied to a carrier sleeve (3), is volume compressible by being formed as a unitary seamless cover layer (3) of foamed or expanded or blown material resulting in micropores or microcells of less than 0.01 mm, with a ratio of closed or individual cells to open cells being greater than 50%. This cover layer will have a bounce-back or rebound elasticity of greater than 95% and preferably has a thickness of between about 1 to 5 mm. It may be covered with a polyurethane or rubber based outer cover layer of, for example about less, than 0.5 mm thickness. The cover layer is applied by providin a base substance which is made thixotropic stirring it and, applying it in …