Brandon Gorakhnauth | Hamamatsu Photonics Deutschland GmbH: Can localized laser sintering actually achieve higher electrical conductivity than hours of thermal oven baking?
00:12:57 - 00:14:38
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Can localized laser sintering actually achieve higher electrical conductivity than hours of thermal oven baking?
Transitioning conductive ink processing from traditional batch ovens to in-line laser systems represents a massive leap in manufacturing kinetics. While typical roll-to-roll oven setups require 20 to 30 minutes of continuous dwell time at low temperatures, laser sintering completes the same transformation in mere seconds of direct beam exposure.
The performance advantage extends directly to the electrical properties of the sintered circuit. Because thermal ovens are limited by the low glass transition temperatures of flexible substrates like PET or paper, they cannot reach the high temperatures needed for optimal nanoparticle necking. Lasers bypass this bottleneck by delivering intense, localized thermal energy directly to the ink before the heat can propagate and damage the substrate.
This localized energy delivery often results in parity or even superior electrical conductivity compared to oven-baked samples. By utilizing organic binders within the ink to facilitate rapid optical absorption, manufacturers can achieve exceptionally low resistivity values at unprecedented production line speeds.
In this short video, you can learn:
* The dramatic speed comparison between 30-minute oven dwell times and sub-second laser sintering.
* Why localized laser heating achieves lower electrical resistivity without causing substrate degradation.
* The role of organic ink binders in facilitating efficient light absorption and rapid thermal densification.
📋 **Clip Abstract** This clip compares the processing speed and electrical performance of laser-sintered conductive inks against traditional oven-cured equivalents. It explains how localized laser energy achieves superior conductivity in seconds while protecting delicate, flexible substrates.
#LaserSintering, #ConductiveInks, #NanoparticleNecking, #FlexibleSubstrates, #PrintedElectronics, #AdditiveElectronics
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12:57 - 15:18
Why are modern printed electronics manufacturers still bottlenecking their roll-to-roll lines with 30-minute thermal ovens?
Why are modern printed electronics manufacturers still bottlenecking their roll-to-roll lines with 30-minute thermal ovens?
Industrial roll-to-roll processing of conductive inks has historically relied on thermal ovens, subjecting printed substrates to slow, low-and-slow heating profiles lasting 20 to 30 minutes. This massive thermal budget drastically limits manufacturing throughput and threatens the structural integrity of delicate substrates. Transitioning to targeted laser centering compresses this process window down to a few seconds by scanning high-power near-infrared beams directly across the printed tracks.
By concentrating power selectively within the ink layer, laser sintering delivers equivalent or superior electrical conductivity compared to oven-baked samples. The localized energy input achieves extremely low sheet resistance, even reaching single-ohm levels for challenging formulations like silver, silver chloride, and copper. This performance jump is enabled by using up to 400 watts of targeted power, which drives rapid metal particle densification without exceeding the thermal threshold of the underlying substrate.
Furthermore, the absorption efficiency of these inks during laser processing depends heavily on the formulation's chemical engineering. Organic binders and vehicles within the ink matrix act as critical coupling agents, facilitating localized light absorption and rapid thermal conversion. This organic-mediated energy transfer allows broad material compatibility across flexible substrates like PET, paper, and TPU without needing to constantly change the laser emission wavelength.
In this short video, you can learn:
* How laser centering slashes processing times from 30 minutes to mere seconds in roll-to-roll configurations.
* The mechanism behind achieving equivalent or superior electrical conductivity using localized 400W laser power.
* Why organic ink vehicles act as essential absorption mediators for laser-driven sintering.
📋 **Clip Abstract** This clip compares conventional thermal oven baking with high-speed laser sintering for conductive copper and silver inks. It explains how localized laser energy achieves superior electrical performance in seconds while preventing damage to temperature-sensitive substrates.
#LaserSintering, #RollToRollProcessing, #ConductiveInks, #OrganicBinders, #PrintedElectronics, #FlexibleElectronics
05:04 - 06:58
How can you shape and split a kilowatt-class laser beam for metal 3D printing with zero moving parts?
How do we maximize photonic sintering efficiency for temperature-sensitive printed electronics without inducing catastrophic substrate degradation?
In printed electronics, photonic sintering efficiency is governed by the spectral distribution of the energy source rather than raw output power. Conventional broad-spectrum blackbody sources, like industrial ovens, distribute energy across an excessively wide wavelength range. This highly inefficient process emits a significant portion of radiation outside the optimal absorption band of the conductive nanoink, rendering the bulk of the energy useless for sintering.
Conversely, targeted, narrow-band light sources like lasers or specialized ultraviolet systems concentrate optical power precisely within the desired spectral window. This wavelength-specific approach ensures energy is absorbed almost exclusively by the functional nanoink. By avoiding broad-band emission, process engineers achieve rapid, highly localized sintering at a fraction of the total output power, optimizing throughput without energy waste.
Furthermore, broad-spectrum thermal processing threatens flexible substrates like polyethylene films due to unwanted parasitic absorption. Polyethylene exhibits sharp, sensitive absorption peaks in the infrared spectrum—specifically at 3.8 microns, 6.8 microns, and approximately 14 microns—and vulnerability to ultraviolet degradation. Deploying narrow-band light sources operating within the substrate's transmission windows prevents this destructive stray heat absorption, allowing faster production without risking thermal deformation.
In this short video, you can learn:
* Why spectral concentration and narrow bandwidths deliver superior sintering efficiency compared to high-power, broad-spectrum blackbody sources.
* How specific infrared absorption peaks in polyethylene substrates can lead to thermal damage during conventional oven processing.
* The strategic advantage of using lasers and targeted UV wavelengths to achieve substrate-transparent photonic sintering for high-throughput manufacturing.
📋 **Clip Abstract** This video clip analyzes the critical role of spectral width in photonic sintering, demonstrating why narrow-band light sources outperform broad-spectrum blackbody ovens. The speaker explains how targeted wavelengths prevent substrate damage in materials like polyethylene by avoiding specific infrared absorption peaks and eliminating destructive stray heat.
🎤 Speaker: Brandon Gorakhnauth
🏢 Company: Hamamatsu Photonics Deutschland GmbH
📅 Event: Additive, Sustainable or 3D Electronics Innovations Day 2025
📍 Location: TechBlick Online Platform
🌐 Learn more at the next TechBlick event: https://www.techblick.com
#LCOSSLM, #DynamicBeamShaping, #PowderBedFusion, #PhaseModulation, #AdditiveManufacturing, #LaserMaterialProcessing