Getting Glass Thermal Stress Cutting Right with Long-Length IR Heaters
If you’re dealing with thermal stress cutting in glass production, you know the struggle. You need a temperature gradient that is exactly right—no guessing, no “close enough.” When you’re working with ultra-long tunnel kilns, that becomes a real headache. Standard lamps just aren’t built for this. To make it work, we build custom infrared units that stretch past 2 meters. The goal is simple:**no cold spots.**If one part of that glass sheet isn’t hitting the right temp, the whole batch is at risk.
How we handle the scale
You can’t just stretch a single filament and hope for the best. That’s a recipe for disaster. Instead, we pack in a continuous line of high-output quartz lamps. We map these out carefully so the heat density stays the same from the first inch to the last. Because if the wattage dips at the ends?**Your glass cracks.**It’s that simple. We basically create a “wall of heat” that treats every square inch of the glass the same way.
The annoying stuff (and how we fix it)
Here’s the thing about running long arrays: the electrical load is huge. You start worrying about voltage drop. If you aren’t careful, the lamps at the end of the tunnel will run cooler than the ones at the start. We tweak the wiring configurations specifically to stop that from happening. Then there’s the quartz itself. It’s fragile. When you’ve got a setup over 2 meters, vibration and thermal expansion can snap those tubes like twigs. To stop that, we use reinforced mounting brackets. But you’ve also got to make sure your conveyor is perfectly level. If the frame sags, it puts mechanical stress on the lamps, and you’ll be replacing burnt-out tubes way sooner than you should.
Making life easier on the floor
Nobody wants to tear down an entire tunnel just because one lamp died. It’s a nightmare. That’s why we build these as modular units. We use quick-connect terminals, so you can just swap a tube and get back to work without spending hours rewiring a whole section. One last tip: check your cooling fans. Make sure they can handle the total wattage of the array. If they can’t, you’ll end up cooking your own control electronics, and then you’ve got a much bigger problem on your hands.