How we handle the heat for thick glass tunnel kilns
Cutting thick glass is a nerve-wracking process. If the heat isn’t perfectly even across the surface, you’re looking at chips or cracks. It’s a nightmare. And when you’re dealing with ultra-long sheets, standard heating lamps just don’t cut it. That’s why we build custom infrared (IR) units that stretch past 2 meters. The goal is simple: keep the temperature steady and smooth all the way through the tunnel.
The trick to scaling up
Most IR lamps you’ll find on a shelf stop at a meter. You might think, “Why not just stretch the filament?” Trust me, don’t do that. You’ll end up with massive voltage drops and weird cold spots. Instead, we use a continuous array of high-wattage quartz elements. We wire them in a specific series-parallel setup so the heat stays dense and consistent from the moment the glass enters to the moment it leaves. It’s the only way to stop thermal shock from ruining your work.
Getting the layout right
These units are built to run 24/7. We overlap the lamps tightly so there are zero “cold spots” between the tubes. We also use heavy-duty quartz because when you’re pushing this much power over a long distance, the materials really start to expand. A quick heads-up on the electrics: you’ll want a precise PID control system. These units pull a lot of current. Make sure your electrical panels can handle the total load, or you’ll be tripping breakers every time you start up.
The real-world headaches
Massive heat is great, but it comes with a catch: thermal expansion. If you mount these lamps too rigidly, the quartz will just snap. It’s that simple. We build in a bit of “wiggle room” (mechanical tolerances) so the lamps can shift slightly as they heat up. One last thing—keep an eye on your exhaust. You need to move the ambient heat away from the ends of the lamps. If that heat lingers, your sockets will burn out, and then you’re back to square one.