HP Latex 3000 Users Guide - Page 396
Wide bands 2 cm apart, Wide bands at least 4 cm apart, 9
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Wide bands 2 cm apart If the bands are about 2 cm (0.8 in) apart, it means that the substrate is well controlled in the print zone and is in contact with all the ribs in the platen as intended. However, if the suction is too high, a difference in grain can be seen, and bands appear 2 cm apart. Here are some tips for solving this problem: ● Align the printheads. ● Check the scan-beam height in the Internal Print Server. If it is higher than normal, try lowering it. ● Decrease the curing temperature to reduce deformation. ● Change from 4 to 6 colors to reduce grain. ● Decrease vacuum and tension settings according to the table below, step by step (a to c), until you find settings that work. Wide bands at least 4 cm apart A small amount of vertical banding (like waves) can be seen, with a frequency from about 4 cm (1.6 in) to 10 cm (3.9 in), when printing large area fills of the same color. The substrate is not in contact with all the ribs in the platen, which means that it is not fully controlled, so wide wrinkles appear on the print zone. As the height of the printhead above the substrate varies, there are local differences in grain that can be seen as lighter or darker wide bands (see picture). To solve this, it is important to improve substrate control in this zone and reduce the wrinkles. 390 Chapter 11 Troubleshoot print-quality issues ENWW