HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 65

The printed plot is shorter than expected, How to achieve better consistency between jobs of

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Substrate issues The printed plot is shorter than expected Some substrates naturally contract when they are printed on and cured, this can mean the total length of the job is shorter than expected. If this is the case you can expand the length of the plot from the RIP, which will compensate for the contraction of the substrate. How to achieve better consistency between jobs of the same length How to reduce as much as possible the length variability between jobs of the same length. 1. Select a substrate which is less susceptible to expansion when being printed on. Most paper-based substrates, such as the HP photorealistic or offset substrates, have a tendency to expand. ● In case you still have to print on substrate susceptible to expansion: ◦ Ensure that the density of ink is similar between each tile (if not, the tile with less ink might be shorter). ◦ If possible increase the heating temperature. ◦ Reduce as much as possible the ink restrictions. ● Make sure that the roll is left within the room where the printer is located for at least 24h, this is to ensure the complete roll is has the same temperature as the printer. 2. DO NOT TOUCH the Print Adjustments (no change of substrate advance compensation). 3. Print all the tiles at once. ● Do not split the jobs at different times (1 tile one day, and the 2nd tile the 2nd day) ● Do NOT change the printmode or the substrate width between tiles. To print the tiles all at once, we recommend the following: a. Create the tiles from the HP Internal Printer Server (IPS). b. If you are creating the tiles from the RIP, ensure that you send all the tiles within the same jobs sent to the printer/HP Internal Printer Server. The objective is to make sure that there is no pause between the tiles. When using the Queue mode in the HP Internal Printer Server, there is still a small time between the jobs, which could add more variability between the lengths of the tiles. 4. In order to make sure that even the first tile has the less difference of length versus the other ones, add a top margin of 50 cm. In case you have to reprint one tile, in order to ensure the length will be as close as the previous jobs: ● Make sure that the substrate and also the ambient temperature of the printer are the same as when the previous job was printed ● Add a top margin of 50 cm ENWW The printed plot is shorter than expected 59

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The printed plot is shorter than expected
Some substrates naturally contract when they are printed on and cured, this can mean the total length
of the job is shorter than expected. If this is the case you can expand the length of the plot from the RIP,
which will compensate for the contraction of the substrate.
How to achieve better consistency between jobs of
the same length
How to reduce as much as possible the length variability between jobs of the same length.
1.
Select a substrate which is less susceptible to expansion when being printed on. Most paper-based
substrates, such as the HP photorealistic or offset substrates, have a tendency to expand.
●
In case you still have to print on substrate susceptible to expansion:
◦
Ensure that the density of ink is similar between each tile (if not, the tile with less ink
might be shorter).
◦
If possible increase the heating temperature.
◦
Reduce as much as possible the ink restrictions.
●
Make sure that the roll is left within the room where the printer is located for at least 24h, this
is to ensure the complete roll is has the same temperature as the printer.
2.
DO NOT TOUCH the Print Adjustments (no change of substrate advance compensation).
3.
Print all the tiles at once.
●
Do not split the jobs at different times (1 tile one day, and the 2nd tile the 2nd day)
●
Do NOT change the printmode or the substrate width between tiles.
To print the tiles all at once, we recommend the following:
a.
Create the tiles from the HP Internal Printer Server (IPS).
b.
If you are creating the tiles from the RIP, ensure that you send all the tiles within the same jobs
sent to the printer/HP Internal Printer Server.
The objective is to make sure that there is no pause between the tiles. When using the Queue
mode in the HP Internal Printer Server, there is still a small time between the jobs, which could add
more variability between the lengths of the tiles.
4.
In order to make sure that even the first tile has the less difference of length versus the other ones,
add a top margin of 50 cm.
In case you have to reprint one tile, in order to ensure the length will be as close as the previous
jobs:
●
Make sure that the substrate and also the ambient temperature of the printer are the same as
when the previous job was printed
●
Add a top margin of 50 cm
ENWW
The printed plot is shorter than expected
59
Substrate issues