2012 10 15-sirris_µprinting_day
DESCRIPTION
The Sirris Microfabrication AppLication Lab (SMALL) at Sirris is active in the field of micro deposition and printed electronics by Aerosol Jet Printing technology (AJP). This new technology is very interesting in terms of material deposition on many types of substrates. In order to gather ideas supported by industrial companies and to help industry innovate, Sirris and its SMALL laboratory equipped with AJP technology, invited people from industry to this workshop at the Sirris’ 'µPrinting Day'. During this event, experts in Aerosol Jet printing technologies from OPTOMEC, a recognized leader in the field of additive manufacturing, were present.TRANSCRIPT
le centre collectif de l’industrie technologique belge
µPrinting Day @ Sirris (15th October 2012)
µPrinting : change your paradigm - some cases @ Sirris
SMALL LAB team @ Sirris : carl Emerecht, Denis Vandormael, Eric Beeckman, Guy Lagaeyes, Laurent Seronveaux, Olivier Gramacia, Stephane Louis
Presented by Laurent Seronveaux Research and Project Engineer
Paradigm to break to innovate !
• Paradigm
• Substrate and ink Material
• Porous material
• Flexible substrate
• Textile and conductive tracks
• Textile and sensors
• 3D part functionalizing paradigm
• Electroluminescent lighting
• Sintering methodology
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Paradigm to break to innovate !
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A paradigm is a generally accepted perspective of a mental model defined as an interpretive framework of the world or the specific field.
Paradigm Dissonance: A Significant Factor in Design and Business Problems (by Jason Withrow and Mark Geljon)
Since the world is changing you have to change your paradigm to stay in relation with it
Paradigm to break to innovate !
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Large range of suitable substrate material have to be consider for printed electronic. (ABS, PC, KAPTON,PET, PAPER .... Even for low T° )
The Flexibility is a new concept in the µPrinting and PE (Membrane, Bus, connection on thin film...)
3D parts substrate are suitable µPrinting and PE
© OPTOMEC
© Sirris
© Sirris
©SIRRIS © SIRRIS
Manufacturing Electronic circuitry could be done at Low temperature
Functionalizing material is not limited to Silver but could be : PEDOT, CNT, BIO, Silver, Gold, Pd, etc ...
Substrate and ink Material paradigm
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By the past silver was the panacea. Now, things to consider is the compatibility between substrate and ink. The things to respect is the wettability.
Example of a discontinuous printed cross. (un-wetting surface)
Example of a continuous printed cross. (wetting surface)
© Sirris © Sirris
Substrate and ink Material paradigm
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Angle to reach for optimum printing condition is less than 30°.
When substrate is not compatible you can modify the surface tension by using Corona treatment, plasma
oxygen, heating or coating inter-layer.
About wettability
PET Substrate With plasma treatment
PET Substrate Without plasma treatment
The same quantity of ink have been deposited before and after treatment on the PET film. The wettability has been considerably increased plasma treatment . © Sirris
© Sirris
Substrate and ink Material paradigm
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Ink
Ag (Silver) Carbone nano tube (CNT) PEDOT Copper Gold ... A lot of ...
Substrate
PET PMMA Textile PEEK PC METAL ABS PE Paper Glass ....∞....
Substrate and ink Material paradigm
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Substrate : Textile Ink : Silver
Substrate : Paper Ink : CNT
Substrate : Glass Ink : CNT
Substrate : Dielectric Ink : Silver
Substrate : PET Ink : Silver
Substrate : Paper Ink : Copper
Substrate : COC Ink : PEDOT
Substrate : PMMA Ink : Silver
© Sirris © Sirris © Sirris
© Sirris
© Sirris © Sirris © Sirris © Sirris
Porous material paradigm
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Due to the absorption effect, in the current paradigm, porous material are skipped when sensor have to be printed on. Since Sirris apply a specific method to avoid the absorption effect, then new paradigm to consider is that “Sensor could be printed on porous material”.
Absorption effect is lasting when the ink stays liquid. The idea is to reduce the liquid as soon as the ink is in contact with porous material. The idea is to work with HOT substrate (ideally at curing temperature)
PZT porous material
© Sirris
Porous material paradigm
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Even with porous material and hot platen, the precision of printing could reach a very fine precision of printing by track with about 20µm Here is a example of inter-digitated sensor used for Ultra Sonic detection and (NDT field).
-1st layer ~ « planarization » - Subsequent ones fully functional
20 µm width, 2.5 µm thick tracks
Main issue: roughness and porosity of PZT Ra,PZT between 0.5 µm and 1.5µm
© Sirris
Flexible substrate
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By the past : Withstanding Thick substrata inflexible Presently : Flexibility has to be done on thin film.
ρε y= crack % ε for the
same curvature thin is better for flexibility but worst for manipulation and robustness
© Sirris
Textile paradigm and conductive track
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@eTextile DIY
The conductivity textile are commonly reached by adding a conductive fibber inside the textile. This “additional” part isn’t necessary by using selective deposition as shown here after
Textile paradigm and conductive track
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The new paradigm is to adapt the shape of the line in relation with substrate. Textile is flexible and globally rough. Then the shape of the line is to adapt to provide withstanding to the flexibility of the conductive track with the flexibility of textile.
© Sirris
© Sirris
Textile paradigm and conductive track
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Here is an example of the track printed on textile : New shape of track has been directly printed on textile and stays conductive
The new shape of the line is the new paradigm to consider to be compatible with selective deposition on textile
© Sirris
© Sirris
Textile paradigm and sensors
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Once again, in the past, sensors have been considered as an additional part to integrated in the textile. The new paradigm is to consider that, as done for the conductive track, the sensor cold also be directly printed on textile as shown in the following example
CNT deposition on textile © Sirris
Textile paradigm and sensors
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Results of the printed sensor shows the sensibility of the deposition to tensile load induced in the textile. We use a CNT ink which allow us to measure the load induced in the textile.
Tensile test induced through the roller
Tensile LOAD
© Sirris © Sirris
3D part functionalizing paradigm
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http://www.3d-mid.de/
The fictionalization of 3D part are usually done by Classical method of 3D-MID. One of the most popular is shown here attached.
3D part functionalizing paradigm
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Functionalizing 3D parts are possible by direct & selective deposition as for example by AJP
(1) A 3D substrate is created (2) The material is deposited according to a specific tool path
(3) The deposited material is then very locally sintered by laser
© Sirris
© Sirris
© Sirris
3D part functionalizing paradigm
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Video watch
© Sirris
© Sirris
© Sirris
Electroluminescent lighting
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Electro luminescence is large surface lighting to the fine structure illumination by µPrinting of the rear electrode by AJP.
© Sirris © Sirris
© Sirris
© Sirris
Printing Paradigm versus sintering methodology
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Understanding sintering temperature need to understand what is the ink material compounded. Commercial inks could be nano particle composed. In case of nano particle, we have to consider that the sintering temperature is reduced due to the nano effect. Example : Silver ink could be sintered at 120-150°C (nano particle size about 1 30 nm). Compared to the bulk material sintering temperature at T° > 700°C, the reduction of the sintering temperature is considerably reduced !
Printing Paradigm versus sintering methodology
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Heat oven sintering Laser Sintering Flash or photonic Sintering
Complete Substrate have to withstand to sintering temperature
The sintering temperature is done at room temperature. Only the very localised surface under the deposited ink track will be submitted to high temperature for a very short time. Then, this technology is suitable for low temperature substrate
Conclusion
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“With selective deposition you have to think as ”never done before””
Electo luminescence
© Sirris
© Sirris
© Sirris
© Sirris
© Sirris
© Sirris
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Thinking of the day !
Industrial companies are related to the world World is constantly changing and innovating
Then Company have to innovated
Then, new paradigm consideration, is pushing to Success
Thanks for your attention. Thank to the team.
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www.small-lab.be www.sirris.be/AJP
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