Getting Medium Wave IR Right for Wide-Format Low-E Lines
If you’re preheating wide-format Low-E glass, you know the struggle. You need the heat to be perfectly even across the whole sheet. But once you cross that 3-meter mark, the usual off-the-shelf infrared lamps just don’t make the cut. You end up with these annoying “cold spots” right where the short lamps meet. It’s a headache. That’s why we build continuous, ultra-long medium wave units. One long stretch of heat, no gaps.
The struggle with length and power
Building a lamp longer than 3 meters isn’t as simple as just making it longer. You run into issues with voltage drop and thermal expansion. If the power isn’t balanced perfectly from one end to the other, your coating won’t stick properly. And that’s a disaster you don’t want on your line. We use heavy-duty quartz tubing for the filament. We stick with medium wave because it actually sinks into the glass. It gives you that deep, steady heat needed for Low-E without just scorching the surface.
Keeping things from breaking
Let’s be honest: long glass tubes are fragile. If you just “drop in” a 3-meter lamp, it’ll bow or snap under its own weight. To stop that, we tuck the lamps into reinforced aluminum housings. It gives them the backbone they need. We also use industrial-grade connectors that can take a beating from the constant vibration of the conveyor line. It’s built to last, not just to work.
The one catch: Warm-up time
Here is the trade-off. These wide units pack a massive amount of heat, but they have a lot of thermal mass. Because they’re so big, they take longer to get up to temperature than a bunch of small lamps would. You can’t just flip a switch and go. You’ve got to build that warm-up time into your morning routine, otherwise, you’ll end up running cold glass through the oven. Plan for it, and you’re golden.