HP Designjet L28500 HP Designjet L28500 Printer Series - User's guide - Page 148

The substrate has bow deformation, Photorealistic, Paper-Solvent, Paper-Aqueous: less than 0.4

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● 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 This deformation may be particularly noticeable in the following applications. ● Printing images that will later be cut automatically or manually. When there is bow deformation, cutters that are aligned on the sides may lose alignment in the center. ● Poster printing, if the poster is framed or mounted on a straight surface. The example below shows an original image, the substrate suffering from bow deformation, and the resulting print, also suffering from bow deformation. 142 Chapter 14 Troubleshoot substrate issues ENWW

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●
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
This deformation may be particularly noticeable in the following applications.
●
Printing images that will later be cut automatically or manually. When there is bow deformation,
cutters that are aligned on the sides may lose alignment in the center.
●
Poster printing, if the poster is framed or mounted on a straight surface.
The example below shows an original image, the substrate suffering from bow deformation, and the
resulting print, also suffering from bow deformation.
142
Chapter 14
Troubleshoot substrate issues
ENWW