Getting Your IR Heating Walls Right (No Matter the Car)
When you’re building a custom heating wall for a paint booth, you’re basically chasing one thing: a perfectly even cure across the whole chassis. But here’s the problem. You can’t just throw a grid of infrared lamps on a wall and call it a day. If you do, you’re asking for trouble. Think about the cars coming through your shop. You’ve got low-slung coupes one hour and high-roof SUVs the next. The way those IR waves hit the surface changes completely depending on the height of the vehicle. The struggle with vertical spacing It all comes down to where you put the lamps. If they’re too far apart, you end up with “cold spots” where the paint just won’t set. But if you pack them in too tight? You’ll probably scorch the paint on a smaller car. We usually handle this by using a staggered or zoned layout. It’s a lifesaver. It means when a smaller car rolls in, you can just kill the power to specific banks of lamps so you don’t bake the lower panels. Tuning the heat The physics are pretty straightforward—the further away the surface is, the less heat it gets. To fix that, we play around with the wattage or shift the distance of the lamps from the wall. We also like to mix it up. We use shortwave IR to hit the surface fast, then blend in medium-wave for that deeper cure. By stacking them like this, the roof and the side skirts finish at the same time. No guessing games. The trade-offs you need to know Now, you might think, “Why not just add more lamps to speed things up?” Well, there’s a catch. More lamps mean a massive electrical draw and a lot of heat bouncing back into the booth. If you don’t spec out your ventilation and cooling to handle that extra heat, you’re going to warp your wall frames. That’s a nightmare you don’t want. Our trick? Use independent PID controllers for every vertical zone. It lets you tweak the heat map on the fly. You don’t have to spend an afternoon rewriting PLC logic just to change the temperature. You just dial it in and get back to work.