Drying Your Can Seals: IR vs. Induction
If you’ve got water hanging around the sealing zone of a can, you’ve got a problem. It’s a recipe for rust and bacteria, and neither of those belong in your product. To fix it, you basically have two options: induction heating or infrared (IR) lamps. Here is the real-world difference. Induction is great at heating up the metal itself. It gets the can wall hot, and it does it fast. But there’s a catch. It’s a bulk heating process. It doesn’t really “see” the water droplets sitting on the surface; it just cares about the metal. That’s where shortwave IR lamps come in. Think of IR as a targeted strike. The radiation hits those water droplets directly, turning them into vapor almost instantly. By the time the seam is actually crimped, the area is bone-dry. It just works. Plus, there’s the hygiene side of things. In a food plant, the last thing you want is oil or weird conductive fluids leaking onto your line. IR lamps are completely non-contact. We tuck them away in quartz sleeves or stainless steel housings, so nothing ever actually touches the can. No touch, no cross-contamination. Simple. Induction is a bit more finicky. You have to get the coil positioning exactly right. If a coil shifts even a little, you end up with hotspots. IR is much more forgiving—it gives you a wider, more even heat footprint. Now, I’ll be honest: IR isn’t a magic fix for everything. Those high-wattage lamps put out a lot of heat. If you don’t set up your ventilation or cooling fans correctly, you’re going to end up cooking your own electronics. You have to plan for that. So, if you just need the metal to be hot, induction is fine. But if your goal is to kill the moisture and keep things sterile? Go with IR. It’s the only way to be sure that sealing zone is totally dry before the lid drops.