Building Infrared Heating Lamps That Actually Handle the Heat in Glass Tempering Tunnels
If you run a glass tempering line, you know the preheating stage sets the pace for everything. The whole line waits on that one step. So we built infrared heating lamps specifically for the long haul—the kind of ultra-long glass tunnel kilns that make standard 1.5-meter tubes feel like the wrong tool for the job. When your glass runs longer than 2 meters, you need a heat profile that stays steady and continuous from end to end. That means designing the heating element differently from the ground up.
Power, Voltage, and Size—Tailored for the Real World
The whole point is uniform heat across the full length, so we start with lamps that stretch past 2 meters. Then we match the electrical setup to what the lamp actually has to do. We use a high-voltage approach—usually 400V—because it keeps the current lower for the same wattage. That matters when you’re running a long element. It means less loss in the feeder cables and less voltage drop over the distance. We also size the wattage to hit the target preheat temperature quickly. But higher power density brings a real trade-off: your control system and cooling have to be ready to handle the extra heat in the tunnel. No surprises, just a setup that’s properly balanced.
What the Lamp Is Made Of—Quartz, Coating, and Connections That Stay Put
We go with quartz tubes because they handle fast heating and cooling cycles without blinking, and they transmit shortwave infrared energy cleanly. The tube surface gets a reflective coating that pushes the energy downward onto the glass, so you’re not wasting heat to the sides. For the electrical side, we use R7s or Sk15 connectors. These are industrial-grade terminals built for high current, and they lock in place. They’re made to survive the vibration and thermal expansion inside a tunnel kiln. So when a lamp burns out, you swap it in and get back to work—no rewiring the whole bank.
Why This Works in a Continuous Preheat Tunnel
In a continuous tunnel, the glass keeps moving. That means the preheat zone has to deliver heat that’s steady and repeatable, minute after minute. With long lamps arranged continuously, you don’t get cold spots between elements. You get one even temperature band across the entire glass surface, and that’s what keeps tempering quality consistent. Maintenance is simpler, too. One lamp per section means you can isolate a problem, swap it out, and get back online fast. The result is uptime you can count on, thermal control that stays stable, and a layout that fits your tunnel exactly the way it needs to.