ebeam Technologies - University of Manchester
Transcript of ebeam Technologies - University of Manchester
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29/05/18Daresbury ebeam Seminar : Curing 1
ebeam Technologies
Curing with ElectronBeam2-Week Training School for the CI programme onAccelerators for Security, Health and Environment(ASHE)
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List of Contents
§ EB Curing – some history and applications
§ Drying methods and where EB stands in the landscape
§ Curing Chemistry and Basics
§ EB Curing Printing and Coating Methods
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Disclaimer
All Illustrations, Pictures, Products and Companies mentioned arefor the sole purpose of supporting the content and crediting theillustrations used
It is not intended to promote any specific company, brand, productor service
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Some(personal)Definition
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Curing is the polymerization of a (EB)reactive coating to a solid polymer film
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EB CuringSome history and applications
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How ebeam works
The 3 effectsGet radicalBreak a bondand then …
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ebeam creates radicals
in any organic material
Cut
Link
Paste
… leave it broken
Example: Sterilization
… let it bond to itself
Example: cross-linking ofpackaging material andcables
… let it bond tosomething else
Example: Reactivecompounding, grafting ofbiocompatible materialson membranes
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Industrialhistory ofElectronBeam
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(Raychem - 1950ies)
Raychem Corp.now Tyco (cable and wire)
Ethiconnow J&J (Sterilization)
WL Grace / CryovacNow Sealed Air (Heat shrink)
3M (Solventless PSA)
Sekisui (PE Foams)
Firestone (Tires)
Others (XL- PVC)
Tetra Pak (Printing)
Ford (Dashboard Coatings)
Microporous (Battery Separator)
1957 70ies 80ies 90ies 2000 2010
Tetra Pak(Sterilization)Manhattan
Project
40ies
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History
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First Investigation : 60ies
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ebeam Applications
Hall of Fame Hydrogels
Structure andPattern Surfaces Furniture Foil
(Past)Magnetic Media
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Inks Curing
Lamination
Varnishing
Adhesives
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ebeam Printing
PrintingApplications
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Juice/milk Detergent In mold Pouches
Shrink sleeve Wrappers Pet food Other
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Inks Lamination Adhesives Varnishes and Coatings
MainApplicationsof Curing
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More than inks/coatings
The differentmodes ofebeam inConverting
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Film Crosslinking Direct Coating/Printing
Adhesives Lamination
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More than inks/coatings
The differentmodes ofebeam inConverting
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Transfer Coating Backside Embossing / Pattern Transfer
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Linear Cathode «Curtain Type» Beam(<300kV)
Scanning Beam(mainly <500kV)
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• Widths from 0.25m to 3m• Voltage from 80-300kV
(Printing / Curing typical 80-125kV)• Current from 20mA to 2000mA (typical ~800mA)• Uniformity +-8% typical
• Widths from 0.25m to 2 m• Voltage from 80-300kV
(Scanners not used in Printing)• Current from 20mA to 200mA• Uniformity better than 5% (better possible)
Mainly used in high throughputMainly used in wood panels andhigh uniformity requirements(Adhesives)
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Drying Methods and where EB stands in thatlandscape
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Introduction
What is electronbeamtechnology?
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Thermal UV / UV-LED Electron Beam
Water Based 100% Solid 100% Solid
«Drying»Methods
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Solvent Based Hybrid Hybrid
Energy CuringTraditional Drying Methods
Steam / Oxid. (Textiles)
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Thermal UV / UV-LED EB
DryingMethods (2)
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solvent evaporation
heat
Liqu
idSol
id
VOC
wet weight < dry weight
monomers and oligomers
polymerized coating
no solvent, no PI
wet weight = dry weight
monomers/oligomers/photoinitiator
no solvent
polymerized coating
wet weight = dry weight
Photons Particles
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UV / UV-LED EB
DryingMethods (3)
UV vs. EBnumbers
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• Energy in the form of photons
• Wavelength determinesenergy; typically 250 to 450nm
• Energy unit conversion; 350nm photon = 3.5 eV
• Total applied energy typically0.1 to 0.5 J/cm2
• Energy in the form of acceleratedelectrons
• Accelerating voltage determinesenergy; typically 80 to 180 kV
• Typical electron energy atsubstrate; >70 keV
• Total applied energy typically 20 to40 kGy
• 1 kGy = 1 J/gram
• For 50 gram/meter2 layer =
0.1 to 0.2 J/cm2
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UV / UV-LED EB
DryingMethods (3)
UV vs. EBPenetration
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• Penetration depends on theoptical density of the material
• Penetration is controlled bythe peak irradiance (powerand focus) of the UV source
• Good penetration into clearmaterials
• Limited penetration intopigmented, filled, and opaquematerials
• Effective curing of thin inkfilms
• Effective curing of thickcoatings with low pigmentloading
• Lamination of clear materials
• Penetration depends on the massdensity of the material
• Penetration is controlled byacceleration potential (voltage) ofthe beam
• Easily penetrates into clear,pigmented, filled, and opaquematerials
• Can cure thick and/or heavilypigmented or filled inks andcoatings
• Enables lamination of opaquematerials
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Thermal UV / UV-LED EB
DryingMethods (2)
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Floo
r S
pac
eEn
erg
y R
eq
.
20-100 5-10 1
Sp
ecia
l Req
.
SolventEX-Proof & InsuranceVOC & Incinerator
Water-basedVery long dryers and veryhigh power requirements
InertingLimitiations in Shape of producthigh throughput preferrableEnd-of-line drying
Photoinitiator neededSpecial PI for UV-LEDLimitations for high pigmentationEnd-of-line and Interstation drying
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Printing / Coating methods and what drying method can beapplied (excl. Textile)
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EB CuringCuring Chemistry and Process
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energy cureablechemistriesUV vs. EB basic formulation buildingblocks
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Photoinitiator
Additives(functionalproperties)
Monomers(reactive dilution)
Oligomers(base polymer
properties)
Additives
Monomers
Oligomers
UV EB
UV
• Mostly free-radical curing chemistry• Some cationic chemistry• Curing in air or nitrogen atmosphere• PI concentration ~5% (air), <1%(Nitrogen)• PI is a mayor cost component• PI are low molecular weight, PI migration is a
concern in Food Packaging• PI can cause yellowing over time
EB
• (Almost) exclusively free-radical curingchemistry
• Exclusively in inerted atmosphere• No PI needed, direct initiation of
polymerization• High conversion rates typical, high gloss, high
hardness, high chemical resistance
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ReacticeOligomer Types
Acrylated Type Characteristics
Epoxies fast curing, hard, solvent resistant, low cost
Aliphatic Urethanes flexibility, tough, non-yellowing, resist to weather
Aromatic Urethanes flexible, tough, lower cost than aliphatic
Polyesters low viscosity, good wetting properties
Acrylics good weathering properties, low Tg
Speciality Resins adhesion, special applications
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Tri-functional and higher
Di-functional
Monofunctional
ReactiveMonomerselectrion
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Cure Speed Low Viscosity Flexibility Adhesion Residualuncured
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Non-ReacticeAdditives
• Pigments
• Fillers
• Deformers
• Flatting Agents
• Wetting Agents
• Foaming inhibitors
• Slip Aids
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This energy transfer causesbonds to break in thesemolecules (acrylatefunctionality)
Electrons transfer theirenergy to the monomers/oligomers/ polymers
electrons are acceleratedtowards the print/coating
The result: a liquid to solidfilm within milliseconds
Polymerization occurbetween different molecules
Reactive free radicals aregenerated
How does it work?
How doeselectronbeamtechnologycure inks andcoatings?
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- --
--
-- --
--
-
-
✁E
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Acrylate chemistry is
proven to work
However themechanism/propagation/film
morphology is less well studiedthan in UV
??????
How does it work?
What is thechemistrybehind this?
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H-C=C-C-O-R
H│
H│
O││
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Dose
Dose Rate
Speed
Dose 20-60kGy (25-45kGy typical)
Dose Rate up to 12’000kGy m/min
Speed 25-400m/min (100-300m/min typical)
InertingResidual oxygen < 200ppm typical
<50ppm for special applications (Siliconization)
TypicalConditionsfor Curingwith EB
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Why choose ebeam?
Benefits ofebeam inprintingand foodpackaging
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Consistent Depthof Cure
+High Performance
Colour Blind+
Better Adhesion
Heat-SensitiveSubstrates
Energy Efficiency+
No Heat
Thorough Curing+
Consistent Curing
High Performance+
Constant in Time
No PI Migration+
No Taint/Yellowing
No Photoinitiators+
No PI Odour
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EB CuringPrinting Methods
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The known slides from many presentations
ebeam for printing applications
5/29/2018Packaging Printing – Industry Overview 33
Printing Technologies
Analog
Offset Flexo Electrophotography Inkjet
Digital
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ebeam Printing
Drying processesused in printing
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EB UV Oxyd./IR H2O Heat SolventHeat
Sheet-Offset
Web-Offset
CI-Offset
In-Line Flexo
CI-Flexo
Gravure
Inkjet
EB is always End-of-line drying, hence not well suited ifInterstation drying is needed. Printing is wet-on-wet
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More than inks/coatings
4 in 1 usingebeamtechnologyenablesfurtherbrand-building andcustomdesigns
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Roll Roll
RollRoll
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Printing technologies
Offsetprinting withebeam
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Innovation:
• EB curing – ebeam Core• easy-to-change rolls• substrates as thin as 12 µm
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Printing technologies
Flexoprinting withebeam
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4-in-1 concept:
• EB curing – ebeam Core• EB lamination in-line• slitting• automatic unloading system
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Printing technologies
Digitalprinting withebeam
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ebeam Compact:
the world’s most compact ebeam
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Printing technologies
Digitaltechnologyfor customprinting:GAIA
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• 25m/min (XAAR 1003)
• Aluminium, paper, plastic films
• Food-packaging grade EB CMYK
inks
• Xaar 1003 / Samba printheads
• Variable data
• 350 mm cure width
2.7kW
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HP Indigo
• Electrophotographic printing
• Used in a variety of applicationsincluding food packaging
HP Indigo ElectroInk
• Polyethylene-based
• Dried ink is soft and susceptible toabrasion
• Heat sensitiveà melts when heat-sealing even when laminated
HP Indigo Finishing Effects
HP Indigo
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Solventless/WB/SB Lamination
• Takes time for adhesive to dryà heat-sealing and slitting delayed
• Reduced depth of image
EB OPV & Lamination
• Instantaneous dryingà immediate heat-sealing & slitting
EB OPV
• Maintained depth of image• Effects: gloss, matte, soft touch• Scratch resistance• Demonstrated food compliance
HP Indigo Finishing Effects
HP Indigowith EB OPVand EBLamination
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HP Indigo Finishing Effects
HP Indigowith EB SpotEmbellish-ment
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Printed varnish on spot areas
• Wet-look and other effects
• Luxury branding
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CORE 100Build for Indigo Finishing
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Solvent LaminationSolvent-less lamination
EB Lamination
EBLaminationThe natural fit for digitalprinting
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• From hours to days betweenlamination and shipment
• Large warehouses needed forprinted product
• Pouching and/or slitting need ahigh level of cure before theprocess
• EB Laminating adhesives cureinstantly
• Slitting can be performed ON THEPRESS right after printing
• Pouching can be performedimmediately after lamination
• No warehousing of goods – shipsdirectly off the press
• Laminating adhesives are stable. Nounnecessary cleaning of coaters
Not ideal for digitalworkflow
Ideal for digitalworkflow
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Walking onElectrons:Pattern transferand highresistanceflooring
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Cleveland Steel Case
Example:EB/UVHybrid CoilCoating vsSolventbased CoilCoating
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18-25 Sec.
8-12 Sec.
3-6 Sec.
Hot Air Convection
Induction Curing or Medium Wave InfraRed
Short Wave or Near InfraRed Oven
UV-Curing2 s.
EB-Curing< 1 s
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Cleveland Steel Case
Example:EB/UVHybrid CoilCoating vsSolventbased CoilCoating
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ELECTRONBEAM
CLEANING
BACKERAPPLICATION
REWINDUNWIND
PRIMERAPPLICATION
TOP COATUV GLOSSCONTROL
TOP COATAPPLICATIONPRIMER
UV CURE
BACKERUV CURE
Before
After
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Cleveland Steel Case
Example:EB/UVHybrid CoilCoating vsSolventbased CoilCoating
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Energy Consumption
Power [MW] Rel.Consumption
Energy Cost[$/year]
Convection (Gas) 15.6 100% 2.5M
IR 9.2 59% 2.5M
EB + UV 0.59 < 4% < 0.2M
EB 0.15UV 0.44
..but functional chemistry has higher baseline cost
Business case is a mix from Energy, Raw Materials, floor space,Insurance cost, Environmental cost
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Patent WO2016164220A1
The next stepin ebeamdigitalprinting:
Water-basedEB-curableinkjet ink
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b) Soluble dyes and/ordispersed pigments
a) Acrylate functional- monomer- oligomer- or polymer
An electron beamcurable waterbased inkjet inkcomprising:
e) 20-90% waterd) optional non-reactivewater-soluble ordispersible polymers
c) optional additivesPatent WO2016164220A1
Theformulation
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< 1cP at 25oC
More scope for formulating to a
jettable viscosity
Patent WO2016164220A1
What is theadvantage ofusing water-based EB-curableinkjet inks?
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< 1cP at 25oC
Reduce potential migration:
- Higher molecular weight monomers
- Oligomers
- Polymers
Patent WO2016164220A1
What is theadvantage ofusing water-based EB-curableinkjet inks?
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Run yourtests at ourtrial sites
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EB provides many benefits:- high performance inks/coatings- environmental
advantages
Proven curing option for safe foodpackaging
Digital printing + EB curingenables brand-building andcustomization:- printing/curing- 4 in 1 technology
Water-based EB-curable inkjetinks:- dry/cure without heat- reduce migration- potential
Conclusions
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Get in touch
ContactsMikala [email protected]
Comet AGebeam TechnologiesHerrengasse 103175 Flamatt Switzerland
www.ebeamtechnologies.com