Getting Infrared Heating Right for Long Glass Tunnel Kilns
If you’re heating quartz glass in a tunnel kiln, you already know that batch processing rules don’t apply here. Once you’re dealing with a span longer than two meters, those standard, off-the-shelf lamps just aren’t going to do the job. You need something built for the long haul. That’s where we come in. We build custom-length infrared units meant to sit side-by-side without any gaps in the heat. The struggle with length and heat Here’s the thing: when you stretch a heating element past two meters, physics starts to fight you. The lamps can sag, and you end up with “cold spots” that ruin your glass. We fix this by obsessing over the wattage-per-centimeter. We also tweak the way the filament is wound. If you don’t get the winding density just right, the center of the tube gets way too hot, and the whole thing burns out way sooner than it should. No one wants to be replacing lamps in the middle of a production run. The nitty-gritty on the hardware We use high-purity quartz envelopes because they can handle the constant heating and cooling without cracking. We also beef up the electrodes and the seals. It’s all about keeping that vacuum tight so the unit actually lasts. Plus, we can tune these to your factory’s specific voltage. It’s a small detail, but it means you can ditch those clunky, oversized transformers that just take up floor space. And about the layout? We set these up in continuous arrays. The radiation patterns overlap, so you don’t get those annoying temperature drops between heating blocks. It’s just one smooth, steady wave of heat. A few things to watch out for Now, there are some trade-offs. Longer lamps pack a massive punch of heat, which means they’re hungry for power. You’ve got to make sure your electrical panels and wiring can handle the amperage. If you don’t, you’ll see a voltage drop by the time the power reaches the far end of the kiln. Also, keep in mind that the longer the tube, the more delicate it is during the install. It’s not indestructible. We always suggest using rigid mounting brackets. It stops the vibrations that lead to those frustrating, tiny fractures.