2012 10 15-sirris_µprinting_day

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

le centre collectif de l’industrie technologique belge

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

© sirris 2007 | www.sirris.be | info@sirris.be | 15/10/2012 2


A paradigm is a generally accepted perspective of a mental
model defined as an interpretive framework of the world or the
specific field.

Since the world is changing you have
to change your paradigm to stay in relation with it

Paradigm Dissonance: A Significant Factor in Design and Business Problems (by Jason Withrow and Mark Geljon)



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...)
© Sirris

© Sirris

3D parts substrate are
suitable µPrinting and PE
© OPTOMEC ©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

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.

© Sirris © Sirris

Example of a discontinuous printed Example of a continuous printed
cross. (un-wetting surface) cross. (wetting surface)



About wettability

© Sirris
The same quantity
of ink have been
Angle to reach for optimum printing deposited before
condition is less than 30°. and after treatment PET Substrate Without plasma
treatment
When substrate is not compatible you on the PET film.
can modify the surface tension by The wettability has
using Corona treatment, plasma been considerably
increased plasma
oxygen, heating or coating inter-layer. © Sirris
treatment .
PET Substrate With plasma
treatment



Ink
Ag (Silver) Substrate
Carbone nano tube (CNT) PET
PEDOT PMMA
Copper Textile
Gold PEEK
... A lot of ... PC
METAL
ABS
PE
Paper
Glass ....∞....



© Sirris © Sirris
© Sirris
© Sirris
Substrate : Textile Substrate : Paper Substrate : Glass Substrate : Dielectric
Ink : Silver Ink : CNT Ink : CNT Ink : Silver

© Sirris © Sirris
© Sirris © Sirris
Substrate : PET Substrate : Paper Substrate : COC Substrate : PMMA
Ink : Silver Ink : Copper Ink : PEDOT Ink : Silver


Porous material paradigm

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.
PZT porous
The idea is to reduce the material
liquid as soon as the ink is
in contact with porous
material. The idea is to
work with HOT substrate
(ideally at curing
temperature)
© Sirris


Porous material paradigm

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).
Main issue:
roughness and porosity of PZT
Ra,PZT between 0.5 µm and 1.5µm

-1st layer ~ « planarization »
- Subsequent ones fully functional

© Sirris
20 µm width, 2.5 µm thick tracks


Flexible substrate

By the past :
Withstanding  Thick substrata inflexible

Presently :
Flexibility has to be done on thin film.

y
ε = crack % ε for the
ρ
same curvature 
thin is better for
flexibility but worst
for manipulation
and robustness
© Sirris


Textile paradigm and conductive track

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
@eTextile DIY shown here after



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



Here is an example of the track printed on textile :
New shape of track has been
© Sirris 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


Textile paradigm and sensors

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

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

The fictionalization of 3D part
are usually done by Classical
method of 3D-MID. One of the
most popular is shown here
attached.

http://www.3d-mid.de/


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 © Sirris

© Sirris

(3) The deposited material is then
very locally sintered by laser
© Sirris


Electroluminescent lighting

Electro luminescence is large © Sirris

surface lighting to the fine
structure illumination by
µPrinting of the rear electrode
by AJP.
© Sirris

© Sirris
© Sirris


Printing Paradigm versus sintering methodology

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

Heat oven sintering Laser Sintering Flash or photonic Sintering

Complete Substrate have The sintering temperature is done at room
to withstand to sintering temperature. Only the very localised surface under
temperature 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

© Sirris
© Sirris
© Sirris

“With selective deposition you have
© Sirris
to think as ”never done before””
Electo luminescence

© Sirris

© Sirris


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


Liege Science Park
Rue du Bois Saint-Jean, 12
4102 – SERAING
+32 (0)4 361 87 00
small@sirris.be

www.small-lab.be
www.sirris.be/AJP

Thanks for your attention.
Thank to the team.

2012 10 15-sirris_µprinting_day

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