HP Designjet L28500 HP Designjet L28500 Printer Series - User's guide - Page 74
Faster printing, Color calibration, Substrate, Substrate handling options, Cutter
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Faster printing The obvious way to increase speed is to reduce the number of print passes and/or increase the carriage speed to 1.5 m/s (60 in/s), although these will tend to reduce print quality. Bear in mind the following considerations. ● With fewer than 10 passes, you may see an increase in grain. ● With fewer than 8 passes, the printer is more sensitive to substrate advance problems. ● With fewer than 8 passes, you may need to reduce the ink quantity to improve print quality. ● With carriage speed at 1.5 m/s (60 in/s), you may need longer inter-pass drying times or a lower ink quantity for proper drying. ● If you want to use the high ink level option, you must use at least 10 passes. ● As you reduce the number of passes, the best curing temperature may be more difficult to find, and may be more sensitive to the ambient temperature and humidity. Here are some other suggestions for increasing the speed of printing. ● Concatenating prints saves time, because one can be sent while another is being printed. ● Disable the cutter: press , then , then Substrate > Substrate handling options > Cutter > Off. With most substrates, this saves some time at the end of the printing process. ● Increase the cool-down curing temperatures. This also saves some time at the end of the printing process, but may cause slight substrate deformation, depending on the substrate. NOTE: Printing continuously for more than 2 hours can reduce the life of the printheads. An occasional brief pause allows the printer to service the printheads. See also The printer seems slow on page 151. Color calibration The purpose of color calibration is to produce consistent colors with the specific printheads, inks and substrate that you are using, and in your particular environmental conditions. After color calibration, you can expect to get identical prints from your printer on different occasions. Color calibration can be launched from your RIP software; see your RIP documentation for details. In outline, the process consists of the following steps. 1. A calibration test chart is printed. 2. The HP Embedded Spectrophotometer (or, if you prefer, a different spectrophotometer) scans and measures the test chart. 3. The RIP uses the measurements to calculate the necessary correction factors for consistent color printing on that substrate. 68 Chapter 5 Substrate settings ENWW