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Virtual Printingl


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  • 1. Virtual printing to enhance print quality Christophe Mercier
  • 2. Outline
    • Context / Importance of print quality
    • A virtual printing software
    • Conclusion
  • 3. Context
    • Ink-jet printing applications / expectations
        • Graphics
            • Desktop printer
            • Semi-industrial art reproduction
            • Industrial printer(wallpaper, newspaper, tiles, textiles, packaging)
        • Material deposition
            • Pillars of lead zirconium titanate
    • Not just speed, reliability, easy to operate, but also high quality
    • Customisation/short series: no time for settings
    • Luxury supply chain: perceived quality is important
    • Replacement/complement of technology like offset lithography(result matching)
  • 4. Print quality in IJ printing Difficult subject: Lot of physical interactions + human assessment Optimisation is a time consuming process Important features of the product related to purchases process Customer image quality rating Physical image parameters Technology variables Customer perceptions attibutes System model Visual model m model Image quality model Errors & trials improvements SUBSTRATE INK PRINTER System model
  • 5. Who is concerned by print quality ? Customers type Specific needs Ink-jet integrator Components selection Ink/fluids suppliers Rheological properties: satellites Colour properties Print heads suppliers Jet directionality, drop speed uniformity, drop volume uniformity Ink system supplier Motion system suppliers Motion Accuracy, linearity Substrate suppliers Ink Absorption diffusion Software suppliers (dithering, multi-pass,…
  • 6. What are the available tools:
    • What can I do to improve my print quality, or to control a level of print quality
        • Standards on print quality: ISO 12647 standard
        • Measurement devices
          • direct Software ImageExpert, Colour/density measurement
          • Indirect: JetExpert /
        • Abundant literature on image quality
  • 7. Outline
    • Context / Importance of print quality
    • A virtual printing software
    • Conclusion
  • 8. The product:
    • The proposition
      • To improve the print quality Inks spectrum (Drop-substrate interaction, Drop placement accuracy, Drops volume optimization, printer design)
    SUBSTRATE INK PRINTER(print head, motion system, ink system,RIP) VIRTUAL PRINTER Jettability Spreading Diffusion Substrate, feeding/registration /time to cure/
  • 9. Main features(1):
    • Standalone software application
        • Installation on every computer
    • RIP: gamut mapping, colour separation, dithering, swaths separations,
        • Print swaths ready to be printed
    • Image optimization
        • Contrast enhancement,
    • Substrate (simulation, visualisation)
        • Fabrics: description
  • 10. Main features(2):
    • Inks (Reflectance spectrum, jettability description)
        • Best primaries, interaction with substrate
    • Model of ink/substrates interactions and colour model
        • Relevant parameters
    • Characterisation tools: dots area, lines, dots placement, gamut
        • Comparison with results from microscope, X-RITE
    • Export file
        • Further analysis in Matlab, Excel,…
  • 11.  
  • 12. Parameters for the simulation
    • Long range variations
    Simulation starts at Overall printed area
  • 13. Dots imposition
  • 14. Dots placement accuracy
  • 15. Substrate: fabric
  • 16. Substrate + prints
  • 17. Colour gamut modelling
  • 18. Conclusion
    • Assessing print quality is complex
    • Assessing print quality is even more complex when you control only one aspect
    • To improve our competitiveness: Product standardization ,Reduce Time to market