Why glass cracks in annealing

Fri, 24 Jul 2026 10:29:15 +0800

Stop Fighting Your Furnace: A Better Way to Handle Glass Annealing

If you’ve ever had a piece of glass crack during annealing, you know that sinking feeling. Usually, it comes down to one thing: uneven heat. Here’s the problem. Most bending furnaces are cramped. When you try to squeeze standard, off-the-shelf heating lamps into a tight space, they just don’t fit the curve of the glass. You end up with these annoying “cold spots” where the heat doesn’t reach. That’s where the internal stress builds up, and that’s where your glass breaks. Making the lamp fit the glass (not the other way around) We decided to stop trying to make standard lamps work in non-standard spaces. Instead, we build IR lamps to your exact measurements. Whether you’re dealing with a narrow conveyor or a weird, non-standard glass profile, we can bend the lamp to match. The goal is simple: keep the heat source the same distance from the glass at every single point. When the lamp actually follows the contour of your workpiece, the heat hits the surface evenly. No gaps. No surprises. The “Nerdy” Stuff You Need to Know Now, changing the shape and length of a lamp isn’t just about bending metal; it changes how the electricity flows through the filament. To keep your lamps from burning out too quickly, we tweak the wattage and voltage. Just do us a favor and double-check your power supply specs before we wire everything up. Also, keep in mind that when you pack a lot of heating power into a tiny area, things get hot—fast. Make sure your furnace housing has decent venting, or you might find your reflectors starting to warp. Getting More Out of Less Space The best part? When your lamps actually fit the curve of the glass, you can shrink the rest of your furnace. You get way more heating power in a smaller footprint without worrying about those dangerous hot spots. For the engineers who are tired of wrestling with cramped, awkward machinery, this is a huge relief. You’ll see your cycle times drop and, more importantly, you’ll stop throwing away so much scrap glass. It just works.

Cracks on Warm IR Heater Factory Direct

Why glass cracks in annealing

Stop Fighting Your Furnace: A Better Way to Handle Glass Annealing