| 摘要 |
To separate a flexographic ink fountain into axial zones (10a, 10b...) to permit use of inks of different characteristics, for example different colors along axial zones of an anilox roller (10), a separator element (2) has an insert strip element (3) extending over a portion of the circumference of the anilox roller, and resiliently engaged thereagainst, for example by compressed silicone rubber (5). Adjacent the end of the strip element (5) are two felt pads (21, 31) which are supplied from a source of separating fluids, such as water, alcohol-water solution or the like, to apply a ring-shaped film of the separating liquid on the anilox roller which film will continue beneath the separating strip (3), the separating strip being engaged against the roller with sufficient pressure to permit the strip to ride on the liquid film, similar to planing of automobile tires on a wet road surface. Two doctor blades are located on a trough structure, selectively moveable away from engagement with the surface of the anilox roller in dependence on rotation of the anilox roller. Additionally, the doctor blades (23, 33) can both be spaced from the surface of the anilox roller by a distance just sufficient to clear the anilox roller (10) thus permitting continued operation of the anilox roller when not in use under idling speed conditions, and preventing drying of ink on the anilox roller. When the doctor blades are removed from the anilox roller, the compressible material, and expansion of the felt pad retains the separating film of liquid on the anilox roller, thus saving "wash up" between extended periods when the machine is not printing while conserving the surface of the anilox roller and the edges of the doctor blades. |
