Stop the Chipping: Why We Use Infrared Preheating
Glass is a pain to work with. It’s brittle, stubborn, and the moment a cutting wheel hits it, those annoying “corner breakouts” or jagged chips start popping up. It usually comes down to internal tension—the glass just wants to snap in the wrong place. The secret to fixing this is infrared (IR) preheating. Basically, we warm up the surface before the blade ever touches it. It relaxes the material and lets the break happen cleanly. No more jagged edges. The trick is in the temperature. We use IR lamps because they shoot short-wave radiation right into the glass. Now, we aren’t trying to melt anything here. We’re just looking for that “sweet spot” where the molecular bonds soften up a bit. But you have to be careful. If you crank the heat too high, you’ll warp the glass or cause a thermal shock. Too low? You’re right back to square one with a pile of chipped edges. You really need your sensors and lamps talking to each other in real-time to keep things steady. Finding the right balance Most of the time, we go with short-wave quartz lamps. They heat up fast, which is great for keeping the line moving. But here’s the thing: high-wattage tubes can put a serious strain on your electrical panel. You have to play a balancing game between how much heat you’re pumping out and how thick your glass is. Thicker sheets just need more time to soak up that warmth. The reality of the shop floor Look, IR preheating isn’t some magic wand. It takes up more space on your floor and your power bill will definitely notice. Then there’s the maintenance. Dust and tiny glass shards love to settle on those quartz tubes. If you let that happen, you get hot spots, and then—pop—your filament burns out. My advice? Get a strict cleaning schedule. And for heaven’s sake, make sure your cooling fans are actually strong enough to handle the heat around the housings. If you don’t, your wiring is going to bake and degrade over time.