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This invention describes a method for inkjet printing on porous materials where some ink passes through to the opposite side. To prevent contamination, a surface is positioned beneath the material to catch the excess ink, but the material is kept out of contact with this surface. The claims specifically narrow this to using UV-curable ink, where the ink that passes through is then exposed to UV energy to at least partially cure it on the collection surface.
Why it matters: Filed before widespread adoption of efficient UV LED curing. The claims' focus on UV-curable ink and curing the through-jetted ink benefits significantly from the miniaturization, energy efficiency, and instant-on capabilities of modern UV LED systems, which were not mature in 2003.
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