Georg Boedler | INKATRONIC: Is continuously circulating your high-value functional inks actually destroying their rheological performance?
00:18:10 - 00:20:14
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Is continuously circulating your high-value functional inks actually destroying their rheological performance?
Many engineers assume that continuous, high-rate ink circulation is the ideal way to prevent particulate sedimentation in conductive or quantum dot inks. However, continuous pumping applies sustained shear rates and mechanical stress on the fluid as it passes through the micro-channels of the printhead and ink supply lines.
Over time, this mechanical overstressing alters the chemical and physical properties of the ink, leading to shear thinning, viscosity drift, and severe jetting degradation. In industrial settings, leaving a system in active circulation over a weekend can completely ruin the ink batch, resulting in poor Monday morning start-up performance.
The solution lies in implementing intelligent fluid management systems that dynamically switch between active pressure loops and gravity-fed standby modes. By limiting active circulation to intermittent bursts (such as five minutes every half hour), the ink remains homogeneous without suffering from mechanical shear degradation.
In this short video, you can learn:
* The damaging effects of continuous micro-fluidic shear stress on the rheological stability of functional inks.
* Why continuous weekend circulation loops cause Monday-morning jetting failures and viscosity drift.
* How to design a smart hybrid gravity/active-circulation standby sequence to preserve ink chemistry.
đź“‹ **Clip Abstract** This clip addresses the delicate balance of maintaining dispersion stability in functional inks without causing shear-induced polymer or particle degradation. It outlines how continuous circulation loops alter ink properties and introduces an intermittent standby strategy to preserve fluid integrity.
#RheologicalStability, #MicrofluidicShear, #ViscosityDrift, #FunctionalInks, #PrintedElectronics, #AdditiveElectronics
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00:05:42 - 00:08:12
Why are smaller picoliter droplets actually ruining your high-precision display and conductive printing yields?
Why are smaller picoliter droplets actually ruining your high-precision display and conductive printing yields?
In high-precision additive manufacturing such as printing conductive lines or functional materials for micro-displays, choosing the correct printhead specifications dictates structural yield. Industrial designers often pursue smaller drop sizes under the assumption that smaller equals higher resolution, but this design philosophy is fundamentally flawed if not paired with high drop energy and jetting straightness.
Without high drop energy, small droplets fail to traverse the print gap in a straight trajectory, leading to significant aerodynamic drift. Furthermore, micro-nozzle deviations degrade dot placement accuracy, which is far more critical to line-width fidelity than nominal drop volume.
To achieve stable industrial scaling, high-density functional chemistries—such as quantum dot or conductive metal inks—require robust, circulating printheads. This prevents sedimentation while maintaining stable jetting velocity, proving that mechanical and fluidic control, rather than sub-picoliter droplet targets, drives real-world printing precision.
In this short video, you can learn:
* The mechanical trade-offs of using smaller drop volumes vs. maintaining high droplet kinetic energy.
* Why dot placement accuracy and jetting straightness dictate final print quality over nominal droplet size.
* The critical role of circulating printhead designs when handling high-density, functional micro-display materials.
đź“‹ **Clip Abstract** This clip breaks down the common misconception that smaller drop sizes inherently improve print resolution in functional electronics manufacturing. It explains how drop kinetic energy, jetting straightness, and ink circulation systems dictate true dot-placement accuracy on substrates.
#DotPlacementAccuracy, #CirculatingPrintheads, #DropletKineticEnergy, #QuantumDotJetting, #PrintedElectronics, #AdditiveElectronics
00:08:33 - 00:11:18
Can your micro-printing setup survive the brutal math of a single degree of nozzle angle deviation?
Can your micro-printing setup survive the brutal math of a single degree of nozzle angle deviation?
Scaling from laboratory-scale drop-on-demand printing to industrial high-speed production introduces severe physical challenges. In a laboratory environment, printing very slowly at sub-millimeter distances yields near-perfect results, but real-world production speeds (e.g., 500 mm/s) at a realistic 2 mm stand-off distance amplify microscopic errors exponentially.
Using a concrete thermodynamic and kinetic calculation, a standard printhead exhibits a nozzle-to-nozzle jetting velocity variation of about 1 m/s (ranging from 6 to 7 m/s). This velocity dispersion combined with a mere 1-degree nozzle angular deviation causes droplets to land significantly out of sequence and off-target.
When attempting to print a 15-micron conductive line using 2 picoliter drops, these combined deviations cause a lateral dot spread of up to 100 microns on the substrate. This mathematical reality highlights why nominal lab-scale resolution rarely translates directly to high-yield industrial manufacturing of micro-electronics or display arrays.
In this short video, you can learn:
* The mathematical compounding effect of jetting velocity dispersion and printhead stand-off distance.
* How a minor 1-degree angular nozzle deviation expands a targeted 15-micron print line to a 100-micron error zone.
* Structural variations in accuracy when jetting parallel to the nozzle array versus printing along the motion axis.
đź“‹ **Clip Abstract** This clip provides a rigorous mathematical breakdown of droplet trajectory errors when transitioning from lab-scale printing to industrial production. It demonstrates how velocity dispersion and nozzle alignment errors compound over a 2 mm gap to destroy micro-fine line tolerances.
#DropOnDemand, #JettingTrajectory, #VelocityDispersion, #NozzleAlignment, #PrintedElectronics, #AdditiveElectronics