digital low migration printing: technology status and benefits · agfa graphics 2 outline...
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Digital low migration printing
Technology status and benefits Roel De Mondt, PhD – Agfa Gevaert N.V. – Belgium
Packaging and Can Coatings - June 2013 - Dusseldorf
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Outline
• Organisation
• Short background on inkjet printing
• Benefits in digital printing for food packaging
• Background on UV curable and Low Migration inkjet inks
• Innovations in Low Migration inks
• Summary and conclusions
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Organisation
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AGFA-GEVAERT OVERVIEW 2012
Sales by Division
Graphics 53%
Healthcare 39%
Specialty Products 8%
FY 2012
EUR 3
billion
Headquartered in Antwerp, Belgium
Founded in 1867, IPO in 1999 (Brussels)
Sales of EUR 3 billion in 2012
11,512 employees (FTE) worldwide
Wholly owned sales organizations in more than
40 countries
21 R&D and production sites around the globe
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Short background on inkjet printing
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Drivers to go to Digital UV IJ printing for Packaging
• Cost and time savings • Converters become ‘print service providers’ • Flexibility and speed: faster turnarounds: no more time-consuming and
costly plate- or roll-making and processing. UV inks with long open time and fast curing
• The ability to print on a wide range of substrates gives digital presses important versatility over other printing methods, especially in UV.
• Digital printing’s ability to do variable data printing (VDP), enabling the production of unique products
• Safety, track and trace, and brand protection. • Reducing the environmental footprint by reducing substrate waste and
working without VOC and without pre-coats using UV inks. • Regulation (EU) 1169/2011
• provide info: energy and nutrients • language easily understood by consumers • easily visible, clearly legible and indelible • defined minimum font sizes drive to more variable printing shorter runs digital printing
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Sustainable digital printing for food packaging?
Communication
Accessible health
information
QR
Food safe print
VOC
Substrate scrap
Transportation
Warehousing
See Environment
Short run
Lead times
Sustainable
Digital printing
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What is a UV-curable (inkjet) ink made of
and what should it (not) do?
UV curable
monomer
Photoinitiator(s) and synergists
Colorant: pigment with
dispersant Surfacta
nt Stabilizer/Inhibitor
Any UV inkjet ink has to fulfill:
• Shelf life: at least 12 months, transporting all over the
world, all climates and seasons
• Jetting performance and reliability: ink behaviour inside
the printhead and during printing process
• Image quality and ink spreading
• Curing: solidification of the ink at the right speed
• Optical properties: gloss, colour, sharpness, …
• Physical properties: adhesion, flexibility, scratch
resistance, …
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Low Migration digital printing inks
• Myth : You can buy Low Migration inks for UV Inkjet
• LM inks can fulfill the requirements set out in legislations and
requirements, if proper care is taken in designing and maintaining the
whole print system (substrate-ink-printhead-curing)
• What can go wrong?
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How to create LM inks ?
•The ink carrier in UV inkjet
•Preferred for LM: Highly reactive, bulky, multifunctional monomers
•In contrast with viscosity and high cure speed…
•The photoinitiators
Tackled by our team by using: •low viscous, highly reactive monomers, in-house invented, produced under
license externally.
•specific combinations of polymeric, reactive (acrylate functionalised: focus on
Norrish Type II and amine synergists), multifunctional and proven low toxicity
photoinitiators.
Norrish Type
I
Norrish Type II
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What to look out for?
• Purity
• Analytical efforts (supplier or ink producer)
• Specific note on pigments
manageable
• Nature of compounds: e.g. photoinitiators
• Assessed and found of low toxicity
• Polymeric
• Polymerisable
• Reaction products
• Non intentionally added compounds of another level than impurities
• Tricky compounds because unknown when formulating
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What have we been doing?
• Complete crosslinking technology:
Focus on monomers and photoinitiators
• Monomer:
• Photoinitiators
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Reaction product pitfall
wt% Ink 1 Ink 2 Ink 3 Ink 4
VEEA 45 45 32 45
DPHA 20 20 20 20
Type I PI-1 9 9 9 9
POLYMABL AMINE SYN 1 5 5 5 5
Cl-TX 1 20
Cl-TX 2 20
F-TX 1 33
F-TX 2 20
DBP 1 1 1 1
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DPHA is dipentaerythritol hexaacrylate:
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Summary and conclusions
• Sustainable packaging and digital printing
• Digital printing can be an answer to the need for sustainable packaging
• e.g., digital printing lowers waste (substrates and inks, printing too much of the same), renders lower cost,
brings quality information to the public in a safe way
• Printing inks and food packaging
• Food packaging (primary) needs the use of Low Migration inks
• UV inkjet allows to print on many different types of packaging at high printing speed
• LM UV inks need careful design, especially in the case of IJ inks, because of the low viscosity
• Printing process and food packaging
• UV-curable printing process requires control of all parameters (e.g. curing, ink load, …)
• The legal boundaries can be used as a source of information: e.g. the Swiss Ordinance
• UV-curable inkjet inks
• It is possible to formulate LM inks based on commercial compounds, but standard LM ink compounds
(high MW, multifunctional) easily result in a viscosity too high for inkjet printing
• Proprietary UV-curable Low Migration inkjet ink technology
• the right choice of monomers: low viscous and highly reactive
• innovations on the photoinitiator and co-initiator side: dendritic or polymerisable photoinitiators yield
highly reactive low viscosity ink formulations with low extractables
• this also results into formulation flexibility for adding compounds to tune the ink’s functionality: adhesion,
flexibility, withstand post-treatments such as sterilisation
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For your kind attention
• Roel De Mondt
• Project Manager Inkjet Inks
• Email: roel.demondt@agfa.com
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