Fixing the “Cold Spot” Problem in Glass Tunnel Kilns
Most infrared lamps stop at about a meter. If you’re running a long glass tunnel kiln, that’s a problem. Why? Because every time one lamp ends and another begins, you get a “cold spot.” In the glass world, those little temperature dips are a nightmare. They cause stress fractures in large sheets, and suddenly your yield drops. We fixed this by building gold-coated emitters that actually stretch past 2 meters. Getting the heat right The tricky part about a 2-meter tube is making sure it heats evenly. If the voltage isn’t dialed in perfectly, you’ll end up with a scorching hot center and weak heat at the ends. We design these to sit end-to-end, creating a solid wall of heat. No gaps. No dips. Just a smooth, consistent temperature that keeps your glass happy. Why the gold? It’s not just for looks. Standard quartz tubes let a lot of heat bleed out the back, which is basically just wasting money by heating up your kiln’s frame. The gold coating acts like a mirror. It bounces all that energy forward, right onto the glass. You get more punch where you actually need it and a much lower electricity bill. A few things to watch out for Here’s the honest truth: these long tubes are fragile. We build them to drop right into your existing racks, but you’ve got to check your support brackets. If the tube sags even a little, the quartz can snap or the gold coating can stress under the heat. Also, keep an eye on your cooling. The more heat you pump out, the harder your cooling system has to work. If your airflow is sluggish, you’ll fry your lamp sockets. And trust me, nobody wants to deal with a burnt-out socket in the middle of a production run. We can tweak the wiring to fit your specific voltage so the current stays manageable. Just let us know what you’re working with.