US Patent 7189443 Self-levelling under-packing for printing presses

A self-levelling under-packing for printing presses, in particular offset presses, includes at least one polyester-based layer and at least one polyurethane elastomer layer joined inseparably together. The polyester-based layer may be between 50 μm and 350 μm and the polyurethane elastomer layer may be between 20 μm and 1000 μm. The polyester-based layer may be adhesive-coated on one side, in which case the thickness, including the adhesive, may be between 40 and 100 μm, with the adhesive thickness not exceeding about 5 μm.