Glass tube sealing lamp

Sun, 19 Jul 2026 11:56:02 +0800

Getting Continuous IR Heat Right in Long Glass Tunnel Kilns

Most IR lamps are pretty short. But if you’re running a glass tube sealing line, you’ve probably realized that you often need heat coverage for 2 meters or more. The problem with just sticking a few lamps together is the “cold spots.” You get these gaps in the heat that mess up your seal. We fix that by building continuous heating units. No gaps, no guesswork. The battle with power and length When you push a lamp past the 2-meter mark, things get tricky. You start dealing with voltage drops and quartz that wants to expand. If you aren’t careful, you’ll get “striping” on your glass tubes—where one spot is scorching and the next is barely warm. To stop that, we make sure the wattage stays exactly the same every single centimeter. Now, there’s a trade-off here. Using one long unit means fewer wires and plugs to worry about. But, it also means if one lamp pops, a bigger chunk of your kiln goes dark. It’s a balance you have to strike based on your power supply. Building it to last We use high-purity quartz because it’s the only thing that can handle the stress. The trick is in the layout. We line the lamps up in a tight sequence to create a solid wall of heat. This ensures the glass tube hits that sealing temperature and stays there. One pro tip: don’t over-tighten the mounting brackets. Quartz expands when it gets hot. If you bolt it down too hard, the lamps will literally snap the first time you power them up. Give them room to breathe. The heat hangover Here’s the thing: these long units put a massive amount of heat on the kiln’s frame. The temperature profile is great, but the inside of that tunnel gets incredibly hot. If your cooling fans are weak, you’re asking for trouble. Without enough airflow, the heat soaks back into the sockets and melts your wiring. It’s a simple fix—just make sure your ventilation can keep up with the load—but it’s the one thing that usually trips people up.

Sealing on Warm IR Heater Core Tech

Glass tube sealing lamp

Getting Continuous IR Heat Right in Long Glass Tunnel Kilns