Giovanni Obando | Voltera: How do you print highly conductive silver traces on porous cotton without snagging fibers or cracking under flex?
08:47 - 11:02
Other snippets from this talk
Summary of the clip:
How do you print highly conductive silver traces on porous cotton without snagging fibers or cracking under flex?
Printing functional electronics directly onto untreated, porous textiles introduces severe challenges in fiber interference and trace discontinuity. Voltera resolved these issues by implementing a pre-print heat press step to flatten loose cotton fibers, allowing the nozzle to run at a highly uniform fly-height of just 40 microns without snagging.
To achieve reliable electrical contact, the print parameters were optimized for low-speed and high-pressure extrusion. Lowering the print speed to 300 millimeters per minute allows the silver heater resistor ink to thoroughly saturate the cotton fibers and bleed through the textile matrix. This deep fiber penetration is critical to maintaining a uniform cross-sectional trace geometry.
Furthermore, the team employed double-sided printing to mitigate micro-cracking during dynamic fabric bending. By depositing ink on both sides of the textile, they created a robust, interconnected conductive network that maintains a stable resistance of 30 ohms even under repeated physical flexing.
In this short video, you can learn:
* The mechanical pre-conditioning technique of heat-pressing fabric to enable a safe 40-micron nozzle fly-height.
* Why lowering printing speeds to 300 mm/min is essential for complete fiber saturation and trace continuity.
* How double-sided ink deposition prevents micro-cracking and stabilizes trace resistance during dynamic fabric flexing.
š **Clip Abstract** This clip outlines the exact mechanical and fluidic parameters required to print conductive silver traces directly onto porous, untreated cotton. It details how heat-pressing, low-speed extrusion, and double-sided printing work together to prevent trace cracking under dynamic flexing.
š Link in comments š
#DirectToTextilePrinting, #DoubleSidedDeposition, #ConductiveSilverInks, #MicroExtrusion, #ETextiles, #FlexibleElectronics
This is a highlight of the presentation:
Wearable Electronics: Printing Silver Conductive Ink on Cotton Fabric
Future of Electronics RESHAPED USA 2026
10-11 June 2026
Computer History Museum, Mountain View, California, USA
Organised By:
TechBlick
More Highlights from the same talk.
04:02 - 06:13
Can you direct-write high-viscosity MXene and gallium inks without clogging nozzle geometry?
Can you direct-write high-viscosity MXene and gallium inks without clogging nozzle geometry?
Direct-write printed electronics R&D demands precise extrusion control over highly viscous functional inks. The NOVA platform utilizes mechanical positive displacement to force thick-film pastes through a single micro-nozzle. This positive displacement architecture bypasses the limitations of traditional pneumatic dispensing, allowing researchers to process highly non-Newtonian fluids.
The system's rheological sweet spot ranges from 1,000 to 1,000,000 centipoise, accommodating challenging third-party formulations like silver, copper, gold, gallium, and MXene inks. To enable complex multi-layer sensor stack-ups, the platform integrates a 70-micron resolution onboard camera. This allows for real-time augmented reality alignment, ensuring perfect layer registration when depositing conductive and insulating layers sequentially.
By utilizing a vacuum table to secure thin-film substrates like PET and Kapton, the system minimizes mechanical distortion during printing. This mechanical stability, combined with positive displacement extrusion, provides researchers with a highly repeatable tool for rapid prototyping of advanced sensors and flexible circuits.
In this short video, you can learn:
* How mechanical positive displacement overcomes pneumatic extrusion limitations for non-Newtonian inks.
* The rheological operating window of 1,000 to 1,000,000 centipoise for novel materials like gallium and MXene.
* Utilizing a 70-micron resolution camera with AR overlay for precise multi-layer sensor registration.
š **Clip Abstract** Discover how the NOVA platform utilizes direct-write positive displacement to dispense extremely high-viscosity materials up to 1,000,000 cPs. Learn how real-time AR camera alignment enables highly accurate multi-layer stack-ups for advanced sensor R&D.
š Link in comments š
#PositiveDisplacementExtrusion, #DirectWritePrinting, #MXeneInks, #HighViscosityPrinting, #PrintedElectronics, #FlexibleSensors
16:00 - 18:05
Why is precise dispenser-body temperature control critical for keeping conductive ink viscosity stable during R&D?
Why is precise dispenser-body temperature control critical for keeping conductive ink viscosity stable during R&D?
In high-precision printed electronics, even minor fluctuations in ambient lab temperature can drastically alter the viscosity of functional inks. Voltera addresses this rheological challenge by integrating active heating directly into the dispenser body rather than relying on a heated nozzle tip. By maintaining the cartridge body at a constant 30 to 35 degrees Celsius, the system effectively decouples ink rheology from ambient room variations.
While heated nozzles can assist in specialized low-melting-point applications, stabilizing the entire fluid reservoir ensures consistent shear rates and extrusion volumes throughout extended print runs. This thermal stability is crucial when prototype designers work with highly sensitive, customized third-party formulations that exhibit temperature-dependent shear-thinning behaviors.
This robust material handling has driven adoption among major athletic OEMs like Nike and Under Armour for prototyping flexible pressure sensors and smart garments. By bridging the gap between raw ink formulation and repeatable dispensing, the system provides a reliable platform for transitioning textile electronics from academic concepts to commercial prototypes.
In this short video, you can learn:
* How active dispenser-body heating at 30 to 35Ā°C mitigates ambient lab temperature fluctuations to stabilize ink viscosity.
* The technical trade-offs between localized nozzle tip heating and bulk reservoir thermal stabilization.
* Real-world R&D applications of the technology by tier-one athletic apparel brands developing printed biometric sensors.
š **Clip Abstract** Learn how the NOVA platform controls ink rheology by stabilizing the dispenser body temperature between 30 and 35Ā°C during high-precision printing. It also discusses commercial applications where major athletic brands utilize this technology to prototype advanced wearable sensors.
š Link in comments š
#InkRheology, #ActiveThermalStabilization, #ConductiveInks, #ViscosityControl, #PrintedElectronics, #SmartTextiles