Getting Your PET Heating Right: The Secret to Faster Blow Molding
If you’re running a SIG Blomax 10 or a SACMI setup, you know the drill. You’re dealing with milliseconds. That’s your window. If your lamps lag—even by a fraction of a second—you’re going to see it in the bottle. You get those annoying cold spots or walls that are way too thin in some places and thick in others. It’s a headache. That’s why we focused on killing the “thermal inertia” in our replacement lamps. The heat hits fast. We use high-wattage shortwave infrared (SWIR) tech and spec these tubes for high voltage. Why? Because we want that power density pushed right to the edge of the quartz envelope. The result is a filament that hits its peak temperature almost the instant you flip the switch. The heat sinks into the PET preform quickly, meaning the preform spends less time in the oven and more time becoming a finished product. No warping, no stuttering. We went with heavy-wall fused quartz. It’s tough. It doesn’t warp when the heat spikes during a rapid start. Plus, we calibrated the filaments to match your machine’s power supply exactly. You know that “voltage dip” you get with cheap, generic replacements? We fixed that. When you wire these in, the response is smooth and linear. No stuttering, no guessing—just consistent softening every single time. Getting them in the machine. These are simple drop-in replacements. They fit the existing footprints for SACMI and SIG, so you don’t have to mess around with your reflectors or mounts. Just swap them and go. But here is a heads-up: since these lamps pack so much heat into a small space to get that fast response, they put a bit more stress on the lamp ends. If your cooling fans are clogged with dust or just aren’t pulling their weight, that heat will soak back into the connectors. That’s a shortcut to a burnout. Keep your airflow clear, and these things will last.