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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

Any Questions?

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