1. Hybrid UV - Aquacure™ What, Why, Where and When InPrint - Munich
10-12th November 2015

2. Who are SunJet?
SunJet is the business unit responsible for digital within Sun Chemical globally
SunJet has stated aim to be the major supplier of ink to packaging, graphics, publication and industrial markets
SunJet has pioneered technology in UV inkjet since 1990’s
SunJet has been an OEM ink partner in wide format since 2000 / 2001
OEM channel is key to strategy
Technology and supply partnerships are the foundation
Integrity is key to partnership

3. What is our core technology?
UK based technical team specialising on the development of,
Aqueous – Textiles, Publication, Packaging
UV – Graphics, Packaging (flexible & direct to container) and Industrial
Hybrid – Graphics, Packaging and Industrial
Solvent – Graphics, Industrial and Edible
Oil based – Coding and marking
Hotmelt – Industrial and Edible
Ceramic and glass inks – décor and Industrial
Strong links to core R&D teams across Sun and DIC – e.g. Polymer Chemistry, Packaging, Publications, Pigments

4. What is Hybrid UV? Aquacure™
Aquacure™ is a functional aqueous technology, combining waterbased and UV curing technology.
The water component addresses,
The feel, film weight and odour
Health and safety and environmental profile
The UV component addresses,
Durability
Jetting reliability
Media versatility 4

5. What is the background to Aquacure™?
Aquacure™ technology builds upon Sun Chemical’s leadership in aqueous energy curable inks – WetFlex
WetFlex was developed for flexo printing of packaging and incorporated aqueous energy curable dispersion technology
10 years plus of technology development
Fundamental patented technology for liquid inks and inkjet inks well established
Additional patenting of long wavelength sensitisation PI’s for aqueous inks now also established for inkjet to accommodate LED curing
Aquacure™ inks contain:
60-90% water
Low level of co-solvent humectant
UV curable resins/monomers
Photoinitiators, sensitizers
Pigment/dispersant
Additives 5

6. What does this mean practically?
It’s a truly functional aqueous technology
It requires a dual cure system – both heat and UV / EB cure
Offers good head sustainability
Excellent re-solubility
Significant reduction in product hazard labelling
Low film weights
Very low print odour

7. So how do we cure it?
The new functional aqueous technology must be cured with the following mechanism to produce robust films:
If the functional aqueous ink is exposed to UV curing before it is fully dry then a robust ink film will not be produced. 7

8. Media Media Media Media Media Why dry before cure?
UV Reactive Molecules separated by large distances due to dilution with water
Removal of water causes UV reactive molecules to “coalesce” together
UV light exposure cause cross linking of molecules to occur
UV Reactive Molecules =
UV Reactive Molecules =
Cross-links formed by UV reaction =
Cross-links formed by UV reaction =
Media
Media
Media
Media
Media
IR Drying
UV Cure 8

9. So what does this all mean?
To produce quality images the hybrid ink must be thermally pinned. This prevents the ink droplets from combining and reticulating.
It is recommended that infrared lamps are installed on the moving carriage or shortly after the printheads in single pass in order to fix the drops as they land and prevent reticulation
Not thermally pinned
Thermally pinned 9

10. So why Aquacure™ - how does it compare to UV?
Low build - it looks and feels like an analogue flexo or gravure print
Lower film weight on final print (10-30% of the thickness of a standard 100% solids UV-curing ink). Prints can thus be around 1-2 microns.
Very low odour
Improve the health and safety profile and product labelling, since materials of higher molecular weight can be used due to the diluting power of the water component
Extended colour gamut due to thinner films
Low migration capability
Better environmental profile than solvent or 100% solids UV due to low VOC and less consumption of material per square meter of print.

11. Aquacure™ offers a sustainable solution?
Ink Type
Functional Aq
UV-curing
Solvent
VOC Content
Low
High
Non-renewable Resource Consumption
Aquacure™ inks offer key environmental advantages

12. Aquacure™ offers a sustainable solution?
Function Aq UV
Solvent
Aquacure™ inks offer key low VOC inks with high durability

13. Aquacure™ offers a sustainable solution?
Non-Renewable Resource consumption
100%
100%
20-30%
UV-Curing
Solvent
Functional Aq
Aquacure™ inks offer a sustainable solution
and key environmental advantages

14. Where will Aquacure™ be used?
Graphics
Roll to Roll
Hybrid
Rigid
Printers and technology exists today
Drive toward more friendly ink solutions due to continuing complexity of chemical legislation
Primary packaging
Flexible packaging
Surface Print
Reverse Print / Lamination
Food & Personal Care
Packaging sector is keen for digital
Printheads, curing systems and single pass printers now meet packaging sectors needs
A must is the feel and odour of conventional solutions

15. Where will Aquacure™ be used?
Carton and corrugated board
Ideally suited in some respects due to absorption reducing required evaporation
Existing Flatbed machines can serve this market
Ink build and general properties allow for improvement over existing UV chemistry with respect to,
Odour
Feel
Resistance
Folding.
Aquacure™ the enabling functional aqueous inkjet

16. What could a system look like? Multi-pass
CMYK Printheads
Head Scanning
NIR Heaters
Preheater for media, heated platen under heads and post print heaters (40-50C)
Hot Air Knife
Ideally air movement drying (air knife) to accelerate drying
Full Width UV Exposure
Dry printed area entering UV exposure zone
Cured print to take-up roller
Take-up roller 16

17. What could a system look like? Single pass
Water vapour to extraction
Print must be dry prior to UV exposure
CMYK Printheads
UV dose <200mJ/cm2
Drier
(Air/IR) UV
Finishing
Print Direction
Interstation IR Drying for spot control? 17

18. What are the likely drying arrangements? Thermal
Heated platens at 40-55C (variable for media type)
Pre-heater, under head platen and post print heating
Pre-heating “opens” the media for better receptivity: wetting and adhesion
Aids spot control by reducing spreading
Starts drying of inks
NIR & IR lamps
Pinning of spots and additional drying
Suppliers include Adphos, IST, Heraeus and Honle
Adphos NIR Sources 18

19. What are the likely curing arrangements? UV / EB
UV-cure by full-width array
On roll-to-roll machines relatively long exposure times will help cure
LED array? e.g. 395nm stacked array
Instant on/off
Long life/low maintenance
Little heat generation
EB unit where the additional benefits and security are required
Multiple UV-lamps mercury or metal halide?
Fragile lamps with routine replacement required
Warm-up time
ebeam lamp
SunJet Test Arrangements
Cure-All™ Linear 100 Array 19

20. When will Aquacure™ be available?
Aquacure™ chemistry is available
Aqueous compatible printheads are available
Drying techniques are on the open market
Inkjet printer architecture available in graphics and narrow web
Inks are optimised for both scanning and single pass printer architecture
The target markets are ready for digital this technology, consumers like the idea of print being produced with waterbased inks.
Aquacure™ available for application and OEM equipment development now

21. Any Questions?

22. Hybrid UV - Aquacure™ What, Why, Where and When InPrint - Munich
10-12th November 2015