HP Designjet L26500 HP Designjet L26500 printer series - Maintenance and troub - Page 74

The substrate has shrunk or expanded, The substrate has bow deformation

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Troubleshoot substrate ● Increase the vacuum level in steps of 10 mmH2O. Do not exceed the following limits: 20 mmH2O for banners, 35 mmH2O for vinyl, and 50 mmH2O for other substrate families. ● Decrease the warm-up drying temperature in steps of 5°C. ● Decrease the warm-up curing temperature in steps of 5°C. ● Increase the number of passes. ● Make sure that the substrate is stored in the same room in which the printer is located. The substrate has shrunk or expanded During the printing process, some substrates may shrink, while others may expand. If this happens, the dimensions of the print will not be correct. As a general rule, you can expect the following percentages of shrinkage: ● Photorealistic: less than 0.4% ● Paper-solvent, Paper-aqueous: less than 0.5% ● Self-adhesive: less than 1.2% ● Banner: less than 3% shrinkage (if you disable the substrate-advance sensor, less than 7%) The framing problem may be solved by printing a sample and adjusting the size of the image in the RIP. You may reuse this value for all your future prints with the same substrate, although special care must be taken when using banners, as the shrinkage may vary up to 1% depending on the amount of ink used in the print. You can expect the following variations from one print to another: ● Photorealistic, Paper-solvent, Paper-aqueous: less than 0.4% ● Self-adhesive: less than 0.7% ● Banner: less than 1% To solve the tiling problem and improve the repeatability of the printed size, you are recommended to ensure that the substrate-advance sensor is enabled in the RIP's substrate preset, as this will improve the stability of the prints over time. You are also recommended to tile together areas with similar amounts of ink. If this is not possible, print the areas with different amounts of ink as different jobs and modify the length of the job with less ink in the RIP to match its size with the job with high ink content. Some RIPs may provide a scaling option that allows you to compensate easily for substrate shrinkage or expansion; see your RIP documentation. The substrate has bow deformation The following substrates may suffer from bow deformation during printing, as a result of which the print will appear curved. ● Self-adhesive vinyl substrates (some specific calendared vinyls only) ● Cellulose-based poster papers with no backing nor coating, including HP Photorealistic 68 Chapter 7 Troubleshoot substrate issues ENWW

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●
Increase the vacuum level in steps of 10 mmH
2
O. Do not exceed the following limits: 20 mmH
2
O
for banners, 35 mmH
2
O for vinyl, and 50 mmH
2
O for other substrate families.
●
Decrease the warm-up drying temperature in steps of 5°C.
●
Decrease the warm-up curing temperature in steps of 5°C.
●
Increase the number of passes.
●
Make sure that the substrate is stored in the same room in which the printer is located.
The substrate has shrunk or expanded
During the printing process, some substrates may shrink, while others may expand. If this happens, the
dimensions of the print will not be correct.
As a general rule, you can expect the following percentages of shrinkage:
●
Photorealistic: less than 0.4%
●
Paper-solvent, Paper-aqueous: less than 0.5%
●
Self-adhesive: less than 1.2%
●
Banner: less than 3% shrinkage (if you disable the substrate-advance sensor, less than 7%)
The framing problem may be solved by printing a sample and adjusting the size of the image in the
RIP. You may reuse this value for all your future prints with the same substrate, although special care
must be taken when using banners, as the shrinkage may vary up to 1% depending on the amount of
ink used in the print.
You can expect the following variations from one print to another:
●
Photorealistic, Paper-solvent, Paper-aqueous: less than 0.4%
●
Self-adhesive: less than 0.7%
●
Banner: less than 1%
To solve the tiling problem and improve the repeatability of the printed size, you are recommended to
ensure that the substrate-advance sensor is enabled in the RIP's substrate preset, as this will improve the
stability of the prints over time. You are also recommended to tile together areas with similar amounts
of ink. If this is not possible, print the areas with different amounts of ink as different jobs and modify
the length of the job with less ink in the RIP to match its size with the job with high ink content.
Some RIPs may provide a scaling option that allows you to compensate easily for substrate shrinkage or
expansion; see your RIP documentation.
The substrate has bow deformation
The following substrates may suffer from bow deformation during printing, as a result of which the print
will appear curved.
●
Self-adhesive vinyl substrates (some specific calendared vinyls only)
●
Cellulose-based poster papers with no backing nor coating, including HP Photorealistic
68
Chapter 7
Troubleshoot substrate issues
ENWW
Troubleshoot substrate