working for you.

InPrint - Munich

10-12th November 2015

Hybrid UV - Aquacure™

What, Why, Where and When

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

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

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.

8

Why dry before cure?

Media Media

IR Drying

Media

UV Cure

UV Reactive Molecules separated by large distances due to dilution with water

UV light exposure cause cross linking of molecules to occur

Removal of water causes UV reactive molecules to “coalesce” together

UV Reactive Molecules =

Cross-links formed by UV

reaction =

Media Media

UV Reactive Molecules =

Cross-links formed by UV

reaction =

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

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 Low High

Non-renewable Resource Consumption

Low High High

Aquacure™ inks offer key environmental advantages

12

Aquacure™ offers a sustainable solution?

Aquacure™ inks offer key low VOC inks with high durability

Function Aq UV Solvent

13

Aquacure™ offers a sustainable solution?

SolventUV-Curing Functional Aq

100%

20-

30 %

100%

Aquacure™ inks offer a sustainable solution and key environmental advantages

Non-Renewable Resource consumption

14

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?

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

Head Scanning

Preheater for media, heated platen under heads and post print heaters (40-

50C)

Dry printed area entering UV exposure zone

CMYK Printheads

NIR Heaters

Take-up roller

Cured print to take-up roller

Ideally air movement drying (air knife) to accelerate drying

Hot Air Knife

Full Width UV Exposure

17

What could a system look like? Single pass

CMYK Printheads

Interstation IR Drying for spot control?

Print Direction

Drier(Air/IR)

UV Finishing

Water vapour to extraction

UV dose <200mJ/cm2

Print must be dry prior to UV exposure

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

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

Cure-All™ Linear 100 ArraySunJet Test Arrangements

ebeam lamp

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

Any Questions?

working for you.

InPrint - Munich

10-12th November 2015

Hybrid UV - Aquacure™

What, Why, Where and When