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Analogous to our example variant 6, the above figure shows an unusual arrangement of nozzle rows for the operation of a scanning machine. A head block contains 2 rows of nozzles each, which are equipped with one color and are arranged offset from each other by half a nozzle spacing.
A special feature of this high quality printing setup is that the 2 head blocks in this example are only moved in the print direction over slightly more than half the print width to be imaged. The outputs of the adjacent head blocks are softly woven into each other in an overlapping area.
The concept is suitable for applications that regularly utilize an intended print width and foreseeably have to produce more print output. The number of head blocks used can be successively increased without major conversions. Small-format proven conditions can be maintained while output is increased by increasing the printing width. The use of this unusual process can be an interesting alternative to single-pass operation.
In order to achieve the same order of application in both directions of movement, the individual nozzle rows have been mirrored, starting from the center of the head blocks, and loaded with ink.
The print resolution can be freely specified in the head running direction and can be an integer multiple of the resolution resulting from the basic grid of cooperating nozzles in the material running direction. The quality can be determined by a relatively free selection of the multipassing process.
Since the droplet masses of the head blocks arranged next to each other must be kept fairly equal, the use of an actively controlled vacuum system in the ink supply is recommended. Since the print heads are arranged above the print bed during operation, this variant places increased demands on the design of a capping and cleaning unit.