Nina Nielsen | Danish Technological Institute: Is silver the best choice for your wearable electrode? This company slashed costs and enabled mass production by switching to screen-printed carbon.
07:31 - 09:21
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Summary of the clip:
Is silver the best choice for your wearable electrode? This company slashed costs and enabled mass production by switching to screen-printed carbon.
A significant challenge in scaling wearable electronics is the reliance on expensive and difficult-to-process materials. This case study with health tech company Previa highlights their initial EMG sensor, which was based on a silver-coated textile. This approach proved to be extremely labor-intensive and costly, creating a major barrier to mass production and commercial scalability. The need for a more efficient and cost-effective manufacturing solution was critical for their product's success.
The Danish Technological Institute (DTI) developed a transformative solution by replacing the silver-coated textile with a screen-printed, carbon-based ink system. This strategic material substitution not only dramatically lowered the bill of materials but also enabled a shift to a high-throughput screen-printing process, which is compatible with roll-to-roll manufacturing. This process innovation was the key to unlocking mass production capabilities and making the product commercially viable.
The resulting carbon-based EMG sensor demonstrates exceptional performance and durability, crucial for a reusable medical or wellness device. The printed sleeve has been validated to withstand over 50 wash cycles at 40Ā°C with no degradation in conductivity, ensuring a long product lifetime. The final design features a washable sleeve with a detachable electronics hub, providing a practical and user-friendly solution for monitoring muscle activity and preventing repetitive strain injuries in workplace environments.
In this short video, you can learn:
* How to replace costly silver-coated textiles with screen-printed carbon for EMG sensors.
* The key benefits of this material switch: lower cost, mass producibility, and improved sustainability.
* The impressive durability of the final product, withstanding 50+ washes at 40Ā°C.
š **Clip Abstract** A health tech company transitioned their EMG sensor from a costly, silver-coated textile to a mass-producible, screen-printed carbon solution. This change significantly reduced costs while achieving excellent durability and washability for long-term use.
š Link in comments š
#ScreenPrintedCarbon, #EMGSensors, #RollToRollManufacturing, #WearableElectrodes, #PrintedElectronics, #FlexibleElectronics
This is a highlight of the presentation:
DTI Printed Electronics: On body eTextile sensors for physiological and neurological monitoring
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11:10 - 12:13
How do you reliably print a multi-layer electronic circuit onto a stretchy, flexible fabric?
How do you reliably print a multi-layer electronic circuit onto a stretchy, flexible fabric?
This clip details the foundational process for creating robust e-textiles: heat transfer printing. The process begins by screen printing a complete, multi-layer circuit stack in reverse order onto a temporary PET carrier foil. This method allows for high-precision printing on a stable, flat substrate before the circuit is ever introduced to the challenging, uneven, and porous surface of a textile material.
The specific layer stack is a critical aspect of the technology, engineered for both electronic function and mechanical resilience. It typically includes a transfer coating, a flexible barrier or dielectric layer, the conductive traces (e.g., silver or carbon), another encapsulating barrier layer for protection, and finally a thermoplastic adhesive layer. Each layer is precisely printed and cured before the next is applied, ensuring the integrity and reliability of the final circuit.
The final step is the thermal transfer, which integrates the electronics with the garment. The printed PET foil is placed onto the target fabric with the adhesive side down and subjected to controlled heat and pressure in a heat press. This activates the adhesive, permanently bonding the entire electronics stack to the textile fibers, after which the PET carrier foil is peeled away, leaving a fully integrated, stretchable, and durable electronic circuit on the fabric.
In this short video, you can learn:
* The step-by-step heat transfer process for applying printed electronics to textiles.
* A typical multi-layer stack-up, including barrier, dielectric, conductive, and adhesive layers.
* The critical role of the temporary PET carrier in achieving high-resolution prints on flexible fabrics.
š **Clip Abstract** This clip provides a technical deep-dive into the heat transfer method for manufacturing e-textiles. It breaks down the multi-layer printing process onto a PET carrier and the final thermal transfer step onto the fabric.
š Link in comments š
#HeatTransferPrinting, #ETextiles, #PETCarrier, #MultiLayerPrintedCircuits, #PrintedElectronics, #WearableElectronics
12:13 - 13:27
Your smart garment works perfectly out of the lab, but will it survive a single wash cycle, a workout, or daily wear and tear?
Your smart garment works perfectly out of the lab, but will it survive a single wash cycle, a workout, or daily wear and tear?
The commercial viability of e-textiles hinges on their ability to withstand real-world conditions far beyond a controlled lab environment. This requires a focus on four key performance pillars: washability, stretchability, moisture resistance, and sustainability. Unlike single-use medical electrodes, consumer and remote-health wearables must be reusable, demanding robust material and process choices that can endure repeated use, laundering, and exposure to the elements.
The materials and integration process are specifically engineered to handle significant mechanical stress and strain. The printed electronic traces and layers must be inherently stretchable to move with the fabric and the user's body without cracking, delaminating, or failing electrically. This clip demonstrates the physical stretching of the fabric, showing how the integrated circuit conforms without damage, a critical requirement for any garment that must be donned and doffed daily.
Furthermore, e-textiles must maintain performance when exposed to moisture, primarily from sweat during use and full immersion during washing. The clip highlights validation testing where the device is submerged in water to simulate these extreme conditions. This rigorous testing is crucial to ensure the electronics remain functional and safe over the product's entire lifecycle, supporting the healthcare industry's push towards more sustainable, multi-use devices that reduce waste.
In this short video, you can learn:
* The four critical performance requirements for commercial e-textiles: washability, stretchability, moisture resistance, and sustainability.
* How material selection and integration methods enable electronics to withstand mechanical stress and stretching.
* The importance of validating performance against moisture and sweat to ensure long-term reliability.
š **Clip Abstract** This clip outlines the critical testing and validation required to create commercially viable e-textiles. It emphasizes the need for devices to be washable, stretchable, and resistant to sweat to ensure reliability for long-term monitoring.
š Link in comments š
#ETextiles, #StretchableElectronics, #WashableElectronics, #PrintedElectronicsReliability, #FlexibleElectronics, #WearableElectronics