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Captronic séminaire electronique imprimée - présentation VFP Ink Technology
- 1. Screen Printing of Functional Materials on Plastic Films 1 Captronic – 19/01/2016 Technical inks, characteristics, application areas
- 2. 2 Overview IR-Blocking inks Conductive inks - Transparent card detection - Characterization - Our IR-Blocking ink: BR3001 - Electrical conductivity in a printed pattern - The thermal curing, a necessary step - Advantages of printed electronics - Our conductive inks: Silver Electron and Copper Silver Electron - Target markets Conclusions, outlook and future developments Captronic – 20/09/2017
- 3. IR-blocking Inks Captronic – 20/09/2017 3
- 4. 4 Transparent credit card detection IR-blocking ink allows the fabrication of transparent but detectable credit cards Transparent in visible light Payment devices need light absorption to detect credit card insertion Strong absorption in specific wavelengths located in the near infrared range Compatible with lamination between 2 transparent PVC sheets Captronic – 20/09/2017
- 5. 5 Characterization The two critical wavelengths used for card detection are 860 nm and 950 nm These optical properties are obtained using a mixture of organic dyes Typical absorption spectrum of our IR-blocking ink Specters obtained from a spectrophotometer: Thermo Scientific Evolution 220 UV-Visible 860 nm 950 nm The absorption wavelengths can be tailored by modifying grades and relative quantities of the dyes introduced in the ink. Captronic – 20/09/2017
- 6. 6 Characterization Production control need an easier and quicker method Q-card apparatus Detects absorption only for 860 nm and 950 nm wavelengths of samples and compares it to a standard This analysis method conforms to ISO/IEC 10373-1:1998, ISO/IEC 10373-1:2006 The light intensity estimation given by the sensor for a sample have to be lower than a standard ICard at 860 nm IRef at 860 nm < 1 ICard at 950 nm IRef at 950 nm < 1 Captronic – 19/01/2016
- 7. 7 Our IR-Blocking ink: BR3001 Drying step Lamination Temperature: between 40°C and 60°C. Screen: 79 threads/cm Squeegee: PO 65 Shore Hot air tunnel at a temperature between 40°C and 60°C Printing conditions Correspond to a classical lamination protocol for PVC: Step 1 : Temperature 60°C, Pressure 20 PSI, Time 55 sec. Step 2 : Temperature 65°C, Pressure 20 PSI, Time 55 sec. Step 3 : Temperature 100°C, Pressure 20 PSI, Time 60 sec. Step 4 : Temperature 140°C, Pressure 100 PSI, Time 60 sec. Step 5 : Temperature 110°C, Pressure 150 PSI, Time 40 sec. Substrate: transparent PVC Time: between 40 sec and 60 sec.
- 8. Conductive Inks 8 Captronic – 20/09/2017
- 9. Our conductive inks belong to the PTF (Polymer Thick Film) class. The film obtained after drying is a composite material made of an insulating matrix containing a high mass fraction of conductive particles. Printed film before drying Printed film after drying The good transmission of electrons from one particle to the other is the critical point will determine the conductivity of the printed layers. Electrical current runs in the printed pattern through the interparticles contacts. Platelet shaped particles make possible to increase the contact surface. Electrical conductivity in a printed pattern Microstructure of a printed layer Solvent evaporation 9 [inspired from: IDTechEX Conductive Ink Markets 2015-2025, Silver & Copper Inks & Pastes and Beyond]. Captronic – 20/09/2017
- 10. The drying is generally accompanied by a curing step at 150° C for 10 min. The thermal curing, a necessary step Drying and curing can be combined in a single high temperature drying step. Formation of chemical bounds between metal particles and the binder polymer. This treatment reduces empty spaces between particles and polymer matrix. Benefits of the curing step As a result, conduction, adhesion and the maintenance of electrical properties after bending are enhanced. 10 H.S Katz and J.V Mileski Handbook of Fillers for Plastics Captronic – 20/09/2017
- 11. Advantages of printed electronics Additive manufacturing method Suited to flexible electronics Obtained patterns Cost effective production Quick implementation Possibility to functionalize large surfaces Low environmental impact Makes possible the fabrication of multilayered printed electronic devices Allows printed electronics to develop in new sectors (e-textiles, internet of things) Good repeatability High resolution printing 11 [www.besi.com] Captronic – 20/09/2017
- 12. 12 Target markets: flexible circuits Touch panels Membrane switches keyboards [IDTechEX Conductive Ink Markets 2015-2025, Silver & Copper Inks & Pastes and Beyond]. Captronic – 20/09/2017
- 13. 13 [IDTechEX Conductive Ink Markets 2015-2025, Silver & Copper Inks & Pastes and Beyond]. Seat heater Dashboard Illumination Target markets: flexible circuits Captronic – 19/01/2016
- 14. 14 Surface capable of detecting the position and the contact surface of an object which is placed above it. This kind of devices can be obtained using a waveguide The electrical signal of a sinusoidal alternating current which is applied to the circuit is disturbed. The width of the shape and periodicity can be adapted to what is to be detected. The angles are rounded to avoid reflections on the corners The presence of an object placed causes a local change in the impedance The impedance change can be detected and located. Smart carpets Target markets: flexible circuits Captronic – 20/09/2017
- 15. 15 Target markets: RFID antenna [IDTechEX Conductive Ink Markets 2015-2025, Silver & Copper Inks & Pastes and Beyond]. RFID tags Conductive inks enable the fabrication of Flexible antenna Captronic – 20/09/2017
- 16. 16 Detection of sleep apnea healthcare Allows the continuous monitoring of the vital function Sport Enhancement of sport performance [µ sys, Université de liège] [Med Gizmo] Target markets: e-textiles Captronic – 20/09/2017
- 17. 17 Updatable price tags Light emitting business cards with images that light up sequentially Solar bag for recharging low-energy electronic equipment Target markets: smart packaging Captronic – 20/09/2017
- 18. 18 Our conductive inks: Silver Electron A competitive pricing Reduce the silver mass fraction by playing on dispersion state and particles shape. The ink does not contain any hazardous solvent Not toxic Not harmful Not CMR (Carcinogenic, Mutagenic or toxic to Reproduction) The two inks that we propose are compatible with 2 types of post-printing treatments Thermal curing (Substrate: PET, Polyimide). Lamination (Substrate: PVC). Captronic – 20/09/2017
- 19. 19 Thermal curing Lamination Sheet resistance: 25 mΩ/ Substrates: Polyethylene terephthalate (PET), Polyimide, polycarbonate or glass Screen: Polyester 110 treads/cm Squeegee: PO 65 Shore Oven at 150°C for 10 min or 130°C for 30 min Printing conditions Sheet resistance : 20 mΩ/ Substrate : Polyvinyl chloride (PVC) Silver Electron ink Correspond to a classical lamination protocol for PVC : Step 1 : Temperature 60°C, Pressure 20 PSI, Time 55 sec. Step 2 : Temperature 65°C, Pressure 20 PSI, Time 55 sec. Step 3 : Temperature 100°C, Pressure 20 PSI, Time 60 sec. Step 4 : Temperature 140°C, Pressure 100 PSI, Time 60 sec. Step 5 : Temperature 110°C, Pressure 150 PSI, Time 40 sec. Captronic – 20/09/2017
- 20. 20 Silver Electron ink The pronounced platelet shape of silver particles influences the rheological properties of the ink High viscosity at low shear rate with a marked shear-thinning behavior This product exhibit a flow threshold The Silver Electron ink is well suited for printing thick patterns with a high resolution The printed patterns do not flow under the effect of their own weight before drying 0 1 2 3 4 5 6 7 8 9 0 50 100 150 200 250 300 350 400 450 500 Dynamicviscosity(Pa.s) Shear rate (1/s) Dynamic viscosity vs. Shear rate Our ink is suited for 3D printing of conductive patterns 0 1 2 3 4 5 6 7 8 9 0 50 100 150 200 250 300 350 400 450 500 Dynamicviscosity(Pa.s) Shear rate (1/s) Dynamic viscosity vs. Shear rate Captronic – 20/09/2017
- 21. 21 Conclusions Outlook and future developments Development of an halogen-free version of the Silver Electron ink. Development of alternative formulations of Silver Electron for precise specifications of 3D printing. Our ink is free of nanoparticles and exhibit electrical conductivities compatible with the most of printed electronics applications. Our production costs allows us to propose a competitive pricing. Rheological properties of the Silver Electron ink are interesting for the development that need thick patterns with a high resolution. Captronic – 20/09/2017 This ink is suited for 3D printing technology.