hp indigo lep technology - tappi.org · –papers that naturally work with hp indigo presses. •...
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HP Indigo LEP Technology
Laura Field, HP Indigo
Media Manager for the Americas
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Basic Printing Process
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Process comparison with other technologies
Liquid Electrophotographic (LEP)Electroink 4.0 forms a film
Offset Ink
absorption
Toner – dry xerographyFuser melts toner onto paper
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Pre‐press
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“RIPing” a file into CMYKC = cyanM = MagentaY = YellowK = Black
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June 15, 2009 6
Image transfer components
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Electrostatic forces
moves the ink
Image transfer process
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1.PIP is negatively charged but VERY negative - up to1000 volts!
2.When laser strikes the PIP it discharges almost all of its charge
3.Ink is negatively charged but is positive in comparison and is attracted to the less positive areas of the PIP.
4.PIP transfers ink to blanket through temperature differences AND pressure
HP Indigo 5500HP Indigo 3500HP Indigo 5000
…
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New Commercial Press Transfer Process
HP Indigo 7000
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Indigo generations: one shot and four shot
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• Image transfer process four-shotCommercial presses: −7000−5500−3500−5000−3050−1050
• Image transfer process one-shot−All web presses: w3250, w7200−All Industrial presses: ws4500, s2000, ws6000
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LEP – Liquid Electrophotographic inkLike other digital printing technologies, HP ElectroInk enables digital printing by electrically controlling the location of the print particles.
HP ElectroInk is supplied as a concentrated paste that is loaded into the press in tubular cartridges in a ‘clean hands’ operation. Inside the press it is fed into ink supply tanks and diluted with oil, to form a fluid mixture of carrier liquid and colorant particles ready for printing.
The small particle size in the liquid carrier enables high resolution, uniform gloss, sharp image edges, and very thin image layers which closely follow the surface topography of the paper resulting in a highly uniform finish complementing that of the paper.
• Ink is dilute, particles are far apart, as the image is created the particles get closer together, less gel like, more like a solid
•Micro thick polymeric film –Think “Fruit Roll-up”
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Particle Size of LEP vs. Toner
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Media: What works and testing
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Three types of certified papers• Plain papers
–Papers that naturally work with HP Indigo presses.• Optimized papers
–Papers that have chemicals added during the production of the paper enabling the paper to perform well on our presses.
• Treated papers–Papers that are off line surface treated for ink adhesion (sapphire, digiprime, or other chemical solutions)
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Evaluation of Media• North America’s testing facility is Rochester Institute of Technology (RIT)
• Equipment for testing: 7000, 5000 and 4050 • Ws 6000 testing performed within HP Indigo• Purpose of certification: to provide our customers with media recommendations for a large variety of applications. The media must prove to be reliable, of sufficient quality and perform well on press and with our consumables.
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Testing Method
• The substrate certification procedure is built from 3 main
categories:
–Runnability – check the ability of the machine to run the
tested substrate.
–Optimization – check the fixing parameters (peeling, flaking)
of the substrate at several points, additional data is received
for the optimize working point (SPP).
–Blanket compatibility – check the 2nd transfer in terms of
transferability, cleaning ability of the tested substrate,
memories, small dots.
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Substrate Grading System
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LEP and paper usage
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Digital = Growth: HP Indigo LEPDrupa 1995 → ‘08 Drupa ‘08 → ‘12 Drupa ’12 → ‘16
HP Indigo customer page volume
Benny Landa, Indigo Founder
Source: HP Indigo
“Everything that can become digital will
become digital. Printing is no exception”
1B10B
100B
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The future is Digital
• What’s driving the growth?
–Break‐even point–Creating new digital pages–Deconstruction/Reconstruction of the value chain
–Environmental considerations
Source: HP internal estimates
Overall growth
Marketing Collateral11%
2%
Books47%
4%
Direct Mail 4%
11%
Signage14%
4%
Digital growth
Packaging59%
4%
Labels45%
4%
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Innovative customers
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Thank You