Getting Glass Tube Cutting Right with Fast IR Heating
When you’re cutting glass tubes, you need a very specific kind of heat. It has to be intense, but it has to stay exactly where you want it. If the heat spreads too far, you end up ruining the rest of the piece. That’s why we stick with shortwave infrared (IR) lamps. Out of everything available for industrial heating, these have the fastest response time. Period. Why speed matters Most heaters work by warming up a block of ceramic or a metal housing first. That takes time. Shortwave IR is different—it uses radiation. The energy hits the glass instantly. This is a lifesaver for online annealing. You can hit your target temperature in milliseconds. Because it’s so fast, you don’t get that annoying “heat soak” where the warmth bleeds into the cold parts of the tube. No bleeding means no warping and no deformed glass while your line is moving. Dealing with the heat To get a moving line up to cutting temperature, we use lamps with high wattage packed into a short length. It creates a tight, concentrated zone of heat. But here’s the catch: that much power puts a real strain on your gear. If you’re running high-wattage tubes, double-check your wiring and contactors. Make sure they can handle the peak current, or you’re looking at a burnout. Keeping the line moving In a production environment, downtime is the enemy. We’ve made these lamps “drop-in” replacements. We use standard connectors so if a lamp blows, you can swap it out in a few minutes. No need to rewire the whole bank. One thing to keep in mind: shortwave IR is aggressive. If your conveyor speed hiccups or slows down, the glass can overheat in a heartbeat. You’ll want a tight feedback loop between your line speed and the power controller to keep everything steady.