Getting Your IR Heating Right for Silk-Screened Glass
When you’re trying to temper glass right after silk-screening, you’re basically walking a tightrope. You need enough heat to lock in the ink and get rid of those internal stresses, but if you push it too far? Your crisp patterns start to bleed and blur. It’s a mess. That’s where shortwave infrared (IR) lamps come in. They’re the secret to hitting that sweet spot.
Keeping Your Patterns Sharp
The beauty of shortwave IR is how fast it hits the glass. It doesn’t just sit on the surface; it penetrates, heating the ink and the glass at the same time. But you have to be careful. If you crank the wattage too high or put the lamps too close, the ink thins out way too fast. That’s when your lines start to drift. We focus on getting a perfectly even spread of heat across the whole sheet. No “hot spots.” No ruined prints. Just clean, sharp lines.
The Nitty-Gritty Hardware
Not all lamps are created equal. The kind of quartz tubing and filament you use changes everything. If you want fast cycle times, you need the heavy hitters—high-wattage lamps that can really punch through. Just make sure your voltage matches your grid, or you’ll be replacing burnt-out bulbs way more often than you’d like. We also use reinforced end caps. Why? Because conveyor systems vibrate, and the last thing you need is a cracked lamp mid-shift.
The Trade-Off
Here’s the thing: high-intensity heat is great for speed. It gets the glass through the annealing zone faster, which means more product out the door. But there’s a catch. All that heat has to go somewhere. If you’re running at peak capacity, your cooling fans and vents have to be up to the task. If the machine housing starts to bake, your tempering temperatures will start to drift. And once that happens, the strength of your glass is on the line. Get your wiring right. Dial in your dwell time. Do that, and you’ll get glass that’s rock solid with prints that stay sharp.