Getting Infrared Annealing Right for Silk-Screened Glass
Here is the struggle when you’re running silk-screened glass: you’re fighting a constant battle with heat. You need enough of it to cure the ink and get rid of that internal stress, but if you push it too far? You’ve just ruined your pattern or cracked the glass. It’s a tightrope walk. We handle this by using IR annealing systems that hit specific wavelengths to keep those two things in balance.
Keeping Your Lines Sharp
Nobody wants “bleeding” lines or blurry patterns. It looks sloppy. The problem is that if the surface temp spikes too quickly, the ink gets too thin and just spreads out. To stop that, we use shortwave IR lamps. Instead of just searing the top layer of ink, the energy actually sinks into the glass. By tweaking the wattage per centimeter, you can stay in that perfect temperature window. The result? Your ink stays crisp, but the glass still hits the annealing point it needs.
Strength and the “Cold Spot” Problem
Glass strength is all about how it cools down. If the middle of the pane is scorching while the edges are chilly, you’re just baking stress right into the material. We space our IR arrays specifically to kill off those cold spots. We also use reflective housings—basically mirrors—to bounce any stray heat back onto the glass. It makes sure the heat is even across the whole piece.
The Real-World Trade-offs
Now, you might think “just crank up the lamps for faster cycles.” Sure, you can. But high-density arrays put a massive strain on your power grid and your cooling fans. If you go for maximum speed, your cooling system has to be beefy enough to handle the heat building up in the tunnel. If the housing overheats, your lamps are going to burn out way faster than they should. It’s all about the balance. You have to tune your conveyor speed against the lamp output until you hit that sweet spot where the glass is tempered, but the ink looks perfect.