Rubber cylinder sleeve for offset presses
View Patent ↗A rubber cylinder sleeve has a rubber covering with a layer construction which includes, at a distance from the outer surface, compressible layer elements and layer elements which influence the stiffness (S), such as filaments/yarns or fabric structures. The layer elements which influence the stiffness (S), are incorporated uniformly in the circumferential direction but are prestrained to various degrees in a defined manner in the direction of the sleeve axis, so that a stiffness profile is produced across the sleeve width, which profile is symmetrical with respect to the center of the sleeve width.
1. A rubber cylinder sleeve for an offset printing press, the rubber cylinder sleeve having a circumferential direction, an axial direction, and a width in the axial direction, the width having an axial center, the sleeve comprising:
an inner carrier sleeve which can be expanded outwardly using air; and
a rubber covering on the inner carrier sleeve, the rubber covering comprising a first layer bonded to said carrier sleeve and having compressible layer elements and a second layer having elastic layer elements, the elastic layer elements being uniform in the circumferential direction and prestrained to varying degrees as a function of axial position so that the sleeve has a tangential stiffness profile which varies in the axial direction and is symmetric with respect to the axial center of the sleeve.
2. A rubber cylinder sleeve as in claim 1 wherein the tangential stiffness profile affects the speed profile of a conveyed paper web in a range of −0.5% to +0.5% across the width of the web.
3. A rubber cylinder sleeve as in claim 1 wherein said rubber covering further comprises a third layer over said first and second layers, said third layer consisting of rubber.
4. A rubber cylinder sleeve as in claim 1 wherein said tangential stiffness profile is convex.
5. A rubber cylinder sleeve as in claim 1 wherein said tangential stiffness profile is concave.
6. A rubber cylinder sleeve as in claim 1 wherein said tangential stiffness profile is double convex.
7. A rubber cylinder sleeve as in claim 1 wherein said elastic elements are filaments.