Blanket reductant generating compression fatigue caused permanent deformation Unlike offset printing rubber blanket, which bears the ink on the plate on a paper delivered to the role. In order to print ink evenly, outlets clear, rich layers, offset printing blanket must possess moderate hardness, compression deformation is small, ink transfer properties and elongation of small features, both on the chemical properties of the ink absorption and adsorption to have the fountain solution The role also has no oil and syrup with a chemical reaction and the oil, syrup erosion performance. But also because it is offset printing, so the blanket flatness demanding. Hardness: other substances is pressed into the rubber resistant to the ability of its surface. From the printing requirements, the hardness is too high too low will not work, to take into account three aspects: the printing quality, printed version of the life, the press and the accuracy of the blanket itself. Flexibility: refers to the blanket external force is removed immediately after the deformation ability of restitution. The printing process, when the blanket cylinder and the impression cylinder contact, subject to certain blanket deformed by the pressure, the surface turned away from the impression cylinder when the blanket cylinder surface, the blanket requires restitution quickly access again to accept the printing plate point portion of the ink, so the blanket must have a high flexibility. Compression: refers to the rubber blanket after repeated compression deformation strength. When the printing blanket, subject to thousands of times per hour, compression, compression recovery process numerous times, compression fatigue blanket will produce permanent deformation brought about this time, the thickness of the blanket will be thinned, the elastic will reduced, resulting in the blanket can not be used. Thus, the smaller the better compression set blanket.