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Dr Alan Hudd, Managing Director of Xennia, gave this talk at the 20th IMI Annual Inkjet Conference in Las Vegas, USA in Feb 2011. The talk discusses the challenges and opportunities for inkjet decoration in a number of applications, including ceramics, textiles and functional material printing for applications such as solar energy generation.
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Dr Alan Hudd, Managing Director of Xennia, gave this talk at the 20th IMI Annual Inkjet Conference in Las Vegas, USA in Feb 2011. The talk discusses the challenges and opportunities for inkjet decoration in a number of applications, including ceramics, textiles and functional material printing for applications such as solar energy generation.
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Xennia's Dr. Tim Phillips gave a talk at the Textile Coating & Laminating Conference in Cannes, France in Nov 2010, titled "Revolutionising textile decoration and finishing with digital inkjet technology". The talk discussed the great benefits of inkjet technology for textile decoration and finishing, with placement of precise quantities of fluid accurately on the substrate leading to increased productivity, reduced waste and environmental impact, combined with the possibility of adding advanced functionality.
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Session Overview
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1. BUILDING MANUFACTURING PROCESSES
& PRODUCTS DROP BY DROP
Dr Alan Hudd
Xennia Technology Ltd
Presented at the 1st Digital Manufacturing Conference
Florida, USA, June 2011
3. Background to Xennia
Xennia is the world’s leading industrial inkjet solutions provider
15 year history, over 300 customer development programmes
World class reputation underpinned by a strong IP portfolio
Unique expertise in inkjet chemistry with strong engineering capability
Headquartered in UK, sales offices in US and China
Awarded Queen’s Award for Enterprise in 2010
Offering reliable inkjet process solutions:
Inkjet modules and inks for OEM partners with market access
Printing systems and inks for end users through our distributors
4. Xennia helps customers lower
operating costs, increase productivity
and simplify mass customised production
by revolutionising manufacturing processes
5. FROM INKJET IDEAS ...
TO PRODUCTION REALITY
Feasibility studies Process development System design Production solutions
6. Technology push to market pull
Inkjet technology & market evolution curve: The next wave has started
Technology Market Technology Market Technology Market
Innovation Development Innovation Development Innovation Development
Market
size Ceramics
Packaging Electronics
Food Biomedical
Photo Textiles
Labels
Screen print
Cut vinyl
SOHO
Graphics
CAD E-stat
Date Coding Pen plotters
Direct Mail
1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020
7. Manufacturing processes
Key examples of inkjet in manufacturing processes & products
Textiles
Decoration and digital finishing
Industrial decoration
Ceramics, furniture laminates
Printed electronics
Solar energy, displays
Biomedical
Sensor manufacture
8. Inkjet for manufacture
Use inkjet to:
Coat
Create manufacturing processes
Manufacture products
Inkjet printing difficult materials
Pigments (including inorganic), phosphors, metals
Polymers
Functional materials
Key inkjet ink technologies
Pigment and polymer dispersion
Solvent based and UV cure chemistries
10. Digital finishing
Major benefits of inkjet digital finishing
Multi functionality
Single sided application possible
Two sides can have different functions
Patterning – place function where you want it
Functionality applied efficiently to textile surface only
Highly consistent coat weight
Environmental and energy savings
Not influenced by underlying substrate variations
Not influenced by bath concentration or dosing variations
11. Inkjet textile finishing
Inkjet digital textile finishing process
System can be
Standalone; or
Integrated in existing finishing lines
Dust cleaning unit
Textile Finisher
UV IR Conventional Dryer Conventional Dryer
Printing blanket
12. Functional materials
Hydrophobic
Comfort of cotton material on skin side
Water and dirt repellent function on outside
Dirt repellant/self-cleaning
More efficient coating when applied with inkjet
Single-sided application important
Antimicrobial/anti-fungal/anti-insect
Selective deposition, efficient usage
Slow release technology
Materials used cannot be in skin contact
Single-sided application vital
13. Functional materials II
Flame retardant
Highly coherent coating very important
Single side coating allows lighter weight
UV blocking (anti-sunburn)
Coating needs to be away from skin
IR blocking
Insulating fabrics – tents, clothing
Electrically conductive
Antennae incorporated into clothing, tents
Communication with electronic devices
Solar energy harvesting
Tents, awnings, etc
Low cost manufacturing essential
16. Textile value chain
Current textile production technology is labour intensive
Process automation will reduce labour content in costs
Variable costs currently high for inkjet
Inkjet machines will consume tons of ink
Economy of scale dictates lower ink prices
No fundamental reason for prices being higher
Low cost location becomes less important
Logistics will be the key component to control
17. Outlook
from
Inkjet will
revolutionise an
outdated industry to
deliver production
reliability &
productivity at
lower costs
to
19. Renewable energy
Concerns about
Sustainability
Global warming
Pollution
Lead to increasing trend for clean, renewable energy
Solar photovoltaic
Solar thermal
Wind
Tidal
Geothermal
Solar photovoltaic and wind have greatest potential
Renewable energy proportion still very low (0.8% in 2002)
20. Solar energy generation
Huge potential for energy generation
840 W/m2 reaches Earth’s surface during daylight
e.g. 1600 TW strikes continental USA
All electricity needs met with 10% efficient devices covering 2% of area
(Interstate highways currently cover 1.5% of area)
Solar energy harvesting
Thermal – heat from sun heats water
Used for hot water and swimming pools
Photovoltaic – energy from sun used to generate electricity
Can be used for any purpose
21. Solar photovoltaics
Types of photovoltaic (PV) (solar cells) available
Conventional (inorganic)
1st generation – crystalline Si
2nd gen – poly-Si, a-Si, CdTe or CIGS
Input energy creates electron-hole pairs
Separated by internal field
Generates photocurrent
Organic (small molecule or polymer)
Heterojunction design incorporates:
Electron transport layer (ETL) and hole transport layer (HTL)
Input energy creates excitons
ETL/HTL interface drives dissociation into electrons and holes
‘Standard’ materials P3HT and C60 derivatives
22. OPV schematic
P3HT bandgap 1.9 eV
PCBM LUMO-P3HT HOMO separation ~ 1eV
Carrier mobilities 10-4 cm2/Vs
Device efficiencies >4%
Christoph Brabec and James Durrant, Solution-
Processed Organic Solar Cells, MRS Bulletin, 33, 670
(2008)
23. Solar photovoltaics
Key figures of merit for PV
Efficiency
Percentage of incident energy converted into electrical energy
Includes collection efficiency as well as conversion efficiency
Cost
Measured in $ (or €)/Wp
Current typical cost 2-8$/Wp
Need to reduce significantly
Lifetime
Minimum 3-5 years
Desirable 20-25 years
24. Key cost drivers
Key to reducing cost of PV
Lower cost materials
Lower cost manufacturing
Continuous
Additive (no waste)
Flexible
26. Traditional techniques
Thermal/electron beam evaporation
Material is heated and evaporates
Deposits onto substrate and layer grows
CVD/MOCVD
Material made into volatile compound
Compound decomposes to deposit material
Spin coating
Material in solution spun on flat surface
Uniform coating with evaporation of solvent
Spray coating
Solution sprayed on surface
Solvent evaporates
27. Technology comparison
Technology Applicability Scalability Productivity Materials Film Process Multiple
Wastage quality type layers?
Thermal Inorganic/ Low Low (batch) Moderate High Subtractive Yes but
evaporation small slow
(vacuum) molecule
CVD (low Inorganic/ Low Low (batch) Moderate High Subtractive Yes but
pressure) small slow
molecule
Spin-coating Polymer/small Low Low (batch) Poor Medium Subtractive Yes but
molecule slow
Spray-coating Polymer/small High High Poor Low Subtractive Yes
or doctor molecule
blade
Screen or Inorganic/ Medium Very high Moderate Medium Additive Yes but
gravure polymer/small damage?
printing molecule
Inkjet printing Inorganic/ High High Good Medium Additive Yes
polymer/small
molecule
Gas phase versus solution phase deposition
28. Inkjet versus other techniques
Strengths Weaknesses
Non-vacuum Film quality not as good as TE/EB/CVD
Highly scalable
Compatible with continuous/reel-to-reel
process on flexible substrates
Compatible with multi-layer printing
Additive process
Opportunities Threats
Creation of a low-cost organic PV solution
29. Inkjet deposition of coatings
Production inkjet coating deposition requires
High throughput
High reliability high productivity
Excellent ink chemistry
Functional performance
Reliable printing
Costs must make sense for application
30. Low cost manufacturing
Inkjet has the potential to allow low cost manufacturing of PV
Can create a new market dynamic for solar energy production
Need to deposit
PV materials
Contacts
31. Applications for low cost PV
Low cost, flexible PV allows
Lower cost of ‘conventional’ power generation PV
Easier installation
Return on investment reasonable for mass market
Enable new applications not currently possible/significant
Power generation for mobile devices
Power generation for signage
Power generation in clothing
32. Applications example
Sestar Technologies LLC
SolarTurf™
PV incorporated into synthetic grass
Light absorbing layer can be coloured
Absorbing grass is green!
Make compatible with existing consumer products
Allows power generation from existing areas
Lower cost of lighting public and private areas
33. Applications example II
Sestar Technologies LLC
SolarFabrics™
PV incorporated into clothing
Military and civilian
Absorbing materials in all colours
Allows power generation from clothing
Powering phones, radios, iPods, GPS
Powering active camouflage
34. Applications example III
Sestar Technologies LLC
SolarFabrics™
PV incorporated into tents, awnings, etc
Multiple colours
Allows power generation to campsites, homes and buildings
Powering portable devices
Lower cost of lighting public and private areas
35. Market size
Photovoltaic market growing significantly
20-25% per annum
$30Bn industry generating 32GW
Faster introduction impeded by costs
Impact from
Subsidies
Regulations (e.g. specified renewables percentage)
Emissions taxes
Low cost solutions have massive potential
36. Future
Potential
Solar power generation everywhere!
Based on low cost production
Challenges
Increase efficiency
OPV ~1/3 efficiency of conventional
Increase stability
OPV relatively unstable
37. Outlook
Inkjet deposition ready to replace conventional techniques
2008: First organic solar cell fabricated with inkjet
Commercialised inkjet PV production in 2009
Report 1.5m wide, 40m/min
Inkjet printed electronics expected to grow
€62M in 2008
€3,079 in 2013
Source: Plus Plastic Electronics, Pira International
38. Conclusions
Inkjet technology has the potential to transform industrial manufacture
Higher productivity/lower cost
Higher flexibility
Economical shorter runs
(Mass) customisation
Faster product design introductions
Higher quality
New functionality
Environmental benefits
Digital finishing enables process automation
Will strengthen competitive power of Western textile industry
Inkjet promises low cost solar panel manufacture
Solar power generation everywhere