Thomas Kolbusch | Coatema Coating Machinery GmbH: How does heat and mass transfer fundamentally limit the speed of drying processes?

How do you get from 10,000 to 100,000 fuel cell stacks per year without your cycle time killing your business?

The primary challenge in scaling up PEM fuel cell production is the immense leap in volume, from a few thousand stacks to hundreds of thousands, which translates to manufacturing millions of individual Membrane Electrode Assemblies (MEAs). To achieve this industrial scale, a fundamental shift in manufacturing philosophy is required, moving away from slow, lab-based techniques to high-throughput industrial processes.

Traditional discrete manufacturing methods, such as pick-and-place or sheet-based coating, are simply too slow and inefficient to meet these production targets. The cycle times associated with these processes create a bottleneck that makes cost-effective mass production impossible. The only viable path forward is to adopt continuous roll-to-roll (R2R) processing for as many steps as possible.

Roll-to-roll manufacturing, a proven technology in the battery and flexible solar industries, offers the necessary high throughput and economic viability. By continuously coating, drying, and processing long rolls of substrate, R2R systems dramatically reduce cycle times and enable the large-scale production required to bring down the cost of fuel cells and electrolyzers. This approach is the cornerstone of building giga-scale manufacturing capacity.

In this short video, you can learn:
* The massive leap in production volume required for fuel cell industrialization.
* Why continuous roll-to-roll processing is the only viable path to achieve giga-scale production.
* The key economic and throughput advantages of R2R manufacturing for functional films.
📋 **Clip Abstract** To meet the demands of the hydrogen economy, fuel cell manufacturing must transition from slow, discrete processes to high-speed, continuous roll-to-roll production. This shift is essential for achieving the necessary throughput and economic viability for producing millions of MEAs annually.
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What if your functional ink has particles too large and viscosity too high for inkjet, but you still need the design freedom of digital printing?

While analog methods like slot-die coating are excellent for uniform area coating, they lack the ability to create complex patterns or vary layer thickness on demand. Traditional digital printing methods like inkjet, however, struggle with the catalyst inks used in fuel cells, which often contain large particles and have high viscosities that would clog conventional printheads. This creates a technology gap for manufacturers seeking the benefits of digital fabrication.

A novel, non-contact digital printing technology called Laser Induced Forward Transfer (LIFT) provides a powerful solution. The process works by first applying the high-viscosity ink as a uniform layer onto a transparent, endless belt. A high-speed, digitally controlled laser is then fired through the belt, creating a localized pressure pulse that propels a small amount of the ink from the belt onto the substrate below with high precision.

The key technical innovation of this LIFT system is that it transfers continuous "strings" of material rather than discrete droplets. This unique mechanism is not constrained by the rheological limitations of inkjetting. It makes the process exceptionally well-suited for depositing high-viscosity slurries and suspensions with large particles, enabling digital patterning of previously "un-printable" functional materials and opening new design possibilities for fuel cell and electrolyzer components.

In this short video, you can learn:
* The challenges of using inkjet printing for high-viscosity, large-particle catalyst inks.
* The working principle of Laser Induced Forward Transfer (LIFT) as a non-contact, digital deposition method.
* Why transferring "strings" instead of "droplets" allows LIFT to handle inks that are impossible to jet.
📋 **Clip Abstract** Laser Induced Forward Transfer (LIFT) is an innovative digital printing technology that overcomes the limitations of inkjet for challenging fuel cell inks. By using a laser to transfer "strings" of high-viscosity, large-particle material, it provides the design flexibility of digital printing for previously un-printable functional slurries.
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Your catalyst ink is expensive and your coating must be perfect. How do you guarantee a stable, high-precision process window for your slot-die coater?

Slot-die coating is the workhorse technology for depositing precise functional layers in batteries, solar cells, and fuel cells. The core principle involves extruding a fluid through a precision-machined die to form a stable meniscus that continuously coats a moving substrate. Because the process is pre-metered and enclosed, it offers exceptional uniformity and control, which is critical when depositing expensive materials like platinum and iridium catalysts.

Achieving a robust and repeatable process relies heavily on sophisticated engineering and simulation. By using computational fluid dynamics (CFD) tools like COMSOL to model the fluid behavior within the slot-die manifold, manufacturers can optimize the internal geometry for a specific ink's rheology and viscosity. This ensures uniform pressure distribution across the die width, which is the foundation for a defect-free coating.

The result of this optimization is a stable "coating window"—a defined set of operating parameters (coating speed, flow rate, gap to substrate) where the meniscus remains stable and the coating is perfect. Operating within this scientifically determined window is essential for high-yield, large-scale production. It prevents common defects like air entrainment, streaking, or edge instabilities, ensuring the consistent performance and quality of the final fuel cell components.

In this short video, you can learn:
* The fundamental principle of slot-die coating and its application in fuel cell manufacturing.
* How computational fluid dynamics (CFD) simulations are used to design and optimize slot-die heads.
* The importance of defining and maintaining a stable "coating window" for high-speed, defect-free production.
📋 **Clip Abstract** Slot-die coating is a key enabling technology for the mass production of fuel cell components, offering high precision for expensive catalyst layers. Achieving a stable production process relies on sophisticated design, simulation of the ink's rheology, and operating within a well-defined process window.
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