Fixing Those Annoying Heat Gaps in KHS Blowing Machines
Ever pull a batch of PET bottles off the line and see those weird pearlescent streaks or, worse, actual burn marks? It’s frustrating. Usually, it just means your KHS machine isn’t heating things evenly, leaving you with walls that are too thick in some spots and dangerously thin in others. We’ve spent a lot of time figuring this out. That’s why we built a line of quartz heating lamps that you can just slide right into your KHS system. No fuss, no modifications—just a better thermal profile for your preforms.
The trick to a perfect blow
It all comes down to heat density. You need a very specific amount of power hitting every centimeter of that plastic. Our lamps are built to match the exact voltage and wattage your KHS oven expects. We use high-purity quartz glass because it lets the infrared radiation punch straight through to the PET without wasting energy on the air around it. Now, a lot of people try to fix a “cold spot” by just throwing in a higher-wattage tube.**Don’t do that.**You’ll likely just burn the preform. The goal is a smooth, flat heat curve. We get that by carefully controlling how the filament is wound, so the heat is spread out rather than bunching up in the center.
The nitty-gritty: Glass and Plugs
We use halogen-filled tubes here. It lets the filament run hotter without wearing out nearly as fast, which means you aren’t swapping lamps every five minutes. As for the connectors, we stick with the R7s and Sk15 standards. But here is the thing: we tightened the tolerances. A loose plug is a nightmare—it creates resistance, causes arcing, and kills the lamp prematurely. Ours fit snug.
A quick heads-up on airflow
High-output lamps are great for keeping your cycle times fast, but they do put more pressure on your cooling blowers. If your vents are dusty or clogged, the oven temp will start to creep up. If it gets too hot, you risk warping your reflectors. It’s a simple fix, though: just keep your airflow clear, and your lamps will actually last as long as they’re supposed to.