Direct Paper Metallization New Applications with Added Overt and

Covert Security Coding

Professor Nadir A.G. Ahmed

Idvac Ltd.Greenheys, Manchester Science Park

Pencroft Way, Manchester M15 6JJ, EnglandTel: +44(0)161 868 0088Email: idvac@aol.com

www.idvac.co.uk

Company overview

Established in 2004Established in 2004 Private owned- independentPrivate owned- independent StrongStrong links with UK top links with UK top

universities.universities. Advanced Holographic ProductAdvanced Holographic Product

Development.Development. Process Retrofits.Process Retrofits. Feasibility Study.Feasibility Study. ConsultingConsulting Vacuum Training courses, PatentVacuum Training courses, Patent

search, etc.search, etc.

Advanced Materials

Development University LinksAdvanced Vacuum

Coating Processes

New Holographic Product

Advanced Laser

Etching Technology

Idvac Innovation

Advantages of Using Paper

Low Cost for Mass Production. Organic Substrate; Environmentally- Friendly;

Biodegradable, Recyclable. Flexible. Paper is porous, hydrophilic cellulose fibres; suitable

for many products including chemical sensors. Can be manufactured with different grades. Can be formed easily into different shapes. Fast inkjet printing for special products. Paper can be Hydrophobic by special treatment. Dielectric constant close to air; suitable for embedded

RFID.

Metallized Paper Market

Labelling Cigarette Wrap Product Decoration and Identification Smart Paper RFID Holographic

Types of Paper Metallization

Direct Metallization Paper is coated with primer then directly metallized

inside vacuum web metallizer.

Transfer Metallization Polymer film with a release layer is metallized then

metallization is transferred onto paper coated withadhesive.

Advantages & DisadvantagesDirect Metallization

Paper is metallized directly. More economical. Paper can be embossed before or after metallizing. Security coding can be added before or after metallizing. Can provide barrier properties to paper. Good for paper thickness up to 90gsm. Can be metallized with different materials. Can be laser etched for micro-coding

Paper

Base CoatEmbossingAluminium

Advantages & DisadvantagesTransfer Metallization

Good for thick paper board (>90gsm). More expensive; requires another carrier film. Requires extra de-lamination and adhesive Equipment. Release coat left on surface may affect laser etching.

Paper

PET

PrimerAdhesiveAluminiumRelease Coat

Delamination

Factors Affecting Direct Metallizing

Paper Quality Surface Roughness. Moisture Content. Thickness.

Metallizer Winding System Special design for paper thickness>90gsm. Possible web breaks.

Heat of Metallization Coating Thickness. Web Speed.

Vacuum Pressure High Vacuum . Fast Pumping Speed.

Security Elements in Holograms

Covert Overt Covert

UV Visible IR

UV pigments

UV fibres

Holograms

Colour Shift

Nanotext, Microtext

Demetallizing

Printed Security Codes

IR Ink

IR pigments

Examples of Embedded Coding

Paper

Base CoatEmbossingAluminium

Top Coat

Paper

Base CoatEmbossingOptical CoatingTop Coat

Covert Coding

Covert Coding

1

2

Requirements for Special Holographic Labels

Durable against Moisture. Durable against Special Chemicals. Durable Lustre. Embedded Security Coding.Example:Packaging of Detergent, Bottles, Chemicals, etc.Metallizing Materials:Chrome AlloyTransparent Oxide on top of Metallized Film

Chrome Alloy For Special Packaging

Colour Shift Using Vacuum Coatings

0

10

20

30

40

50

60

70

80

90

450 500 550 600 650 700 750 800

Wavelength, nm

Refl

ecta

nce %

(arb

it. valu

es)

Laser DeMet of Paper

Metallized Paper can be Laser DeMet

Can be used to etch Al, Cu, Ni and other materials

Low power Lasers focussed inside optical fibres are usedfor industrial applications.

Logos, characters and bar codes; size <0.1mm

Direct demetallizing with no mask requirement

Very fast demet speed.

Laser pulse within 10 µs with marking time<20ms

Can be installed on a web converting machine

Examples of Paper Laser Demet

1mm

Possible Metallization on Paper

Aluminium, Copper, Chrome Alloy, Nichrome, TinMetal Coatings

Oxides

Silicon Oxide, Metal Oxide

Sulphides

Zinc Sulphide

Examples of Smart Paper

Bioactive paper→ Biosensors. RFID Paper Tags→ UHF (860MHz-

955MHz). Photonic Paper→ Rewritable Paper

Display. Electrochemical Paper→ Thin Paper

Battery. Electronic Devices → Paper Transistor

The Next

20 Years

The Next 20 Years

Environmental concern will increase demandfor paper as organic, biodegradable substrates.

More Integration of Holograms with smartdevices using paper as a substrate.

Advanced technologies of embedding covertcoding within paper fibres. This will includenano and laser technologies.

Developments of Smart Interactive PaperHolograms .

Conclusions

Paper is rediscovered as a unique material forlow cost security, diagnostic andenvironmental sensors.

Embossed paper can be directly metallizedwith different overt materials.

Covert coding can be embedded within paperholographic structure.

Smart holographic devices can be made onpaper substrate.

Thank you for yourattention

Any Question?