Fixing Those Annoying Heat Spots in KHS Blow Molding Lines
Ever pull a bottle off the line and notice the walls are uneven? Or maybe the bottle looks a bit warped? It’s a headache we see all the time with KHS machines. Usually, it happens because the lamps are getting old and developing “cold spots,” or someone swapped in a replacement that doesn’t actually match the heat pattern the machine needs. Here’s the thing: just matching the wattage isn’t enough. If the infrared spectrum is off, your heat won’t be even, and your bottles will show it. The nitty-gritty on heat We build our IR lamps to keep the heat steady and linear. When you’re picking a replacement for your KHS setup, you’ve got to make sure the voltage and wattage play nice with your power supply. If they don’t, you’re just asking for a premature burnout. Now, high-wattage quartz tubes are great because they push energy into a tight beam. That means more heat density and faster cycle times. But there’s a catch. You have to dial in your cooling blow-off to handle that extra heat, or you’ll end up scorching your preforms. Built to take a beating We use high-purity quartz glass because these things go through a lot of thermal stress—heating up and cooling down, over and over. They’re designed as drop-in replacements. We use standard industrial connectors, so you can just wire them up and get back to work without having to mess around with the housing. Inside, there’s a halogen cycle at work. It stops the tungsten filament from evaporating onto the glass. That keeps the glass clear and the heat steady for thousands of hours. It just works. Real-world results When we swap out those OEM lamps for our precision tubes, that annoying “striping” on PET bottles usually disappears. The heat profile across the preform finally feels balanced. Just a heads-up: if you crank up the power to squeeze out more throughput, your lamps won’t last quite as long. It’s a trade-off. And one last tip? Keep your reflectors clean. If they’re pitted or covered in grime, even the fanciest lamp in the world won’t give you a uniform heat field. A little cleaning goes a long way.