Getting the Heat Right in Long Glass Tunnel Kilns
Most infrared lamps stop at about 1.5 meters. But if you’re running a glass tunnel kiln that needs a steady stretch of heat across 2 or 3 meters, those standard tubes just aren’t going to work. You end up with gaps, and in this business, gaps are a nightmare. That’s why we build ultra-long quartz heating units. We design them specifically so they can sit side-by-side without any breaks in the heat. The struggle with length and voltage Here is the tricky part: when you push a quartz lamp past the 2-meter mark, you run into voltage drop. If the tungsten filament isn’t dialed in perfectly, you get these annoying “cold spots” at the ends while the middle is screaming hot. Nobody wants that. We spend our time balancing the wattage-per-centimeter. It keeps the heat flux steady across the whole piece of glass. Just a heads-up—make sure your power supply can actually handle the amperage of these longer runs, or you’ll be tripping breakers all day. Materials and the “Zebra Effect” We use high-purity quartz because it can take the punch of rapid heating and cooling without cracking. But the real magic is in the layout. We make the housings and connectors fit flush. Why? Because it kills the “zebra effect.” You know what I mean—those ugly stripes on the glass where it didn’t get enough heat because of a gap between the lamps. With a continuous setup, those stripes just disappear. Making it work in your shop Wiring these beasts requires a solid footprint. And since they pump out a massive amount of heat over a huge area, your exhaust system needs to be up to the task. If you can’t pull that ambient heat out of the tunnel, you’re going to burn out the ends of your lamps or warp your reflectors. We can send these over as simple drop-in replacements or build something totally custom from scratch. Just tell us how big your tunnel is and what temperature you’re aiming for. We’ll handle the wattage and length math to make sure it matches your belt speed perfectly.