Stopping Glass from Shattering During Tempering
In the glass business, you’re always walking a tightrope. One minute you’ve got a perfect temper, and the next, your workpiece is a pile of shards on the floor. To stop that from happening, we use quartz infrared (IR) lamps. They’re great because they dump energy into the glass almost instantly. The trick is to get that surface hot fast without leaving the core in the cold. If the gap between the two gets too wide, you get internal stress. And that’s when things crack. Controlling the Heat To avoid thermal shock, your system has to be fast. Like, millisecond fast. We build our quartz lamps to handle high-frequency switching. When you hook them up to an SCR or a PWM controller, they react immediately. You can slam the power on for that first big hit, then pull it back the second the glass hits the critical temperature. It keeps the surface from overshooting and saves you from a lot of wasted material. Why Quartz? We use high-purity quartz envelopes so the short-wave IR radiation can actually get into the glass. Here’s the thing: unlike those old long-wave heaters, these don’t waste time heating up the air around the glass. They hit the substrate directly. It’s the only way to get “instant” tempering. But a word of warning. These lamps are powerful, but they’re fragile. Just one fingerprint or a smudge of oil on the tube creates a hot spot. During a high-power cycle, that spot will burn right through the envelope.**Keep your hands clean.**Seriously. The Trade-offs Running high-wattage quartz lamps puts a real strain on your electrical setup. If you’re running a bank of 2kW tubes, you can’t skimp on cooling. You need fans that can actually pull the heat away from the connectors and the lamp ends. If those ends get too hot, the electrodes start to degrade and your lamps won’t last nearly as long. Good ventilation isn’t just a “nice to have.” It’s what keeps your tubes from popping.