On the line, a weak heating bulb makes its presence known immediately. Preforms come out uneven—one side cooler than the other. Crystallinity drifts. Then the scrap rate starts climbing. We built the Krones Contiform 4 heating bulb to keep the heating tunnel stable, shift after shift, so your stretch blow molding line isn’t constantly chasing temperature. What matters, technically This is a short-wave infrared emitter, designed specifically for the Contiform 4, and engineered to match the OEM’s power density, spectral output, and thermal response. It runs at the specified voltage and uses the correct R7s connector interface, so it drops straight into the existing lamp holders—no rewiring needed. The quartz envelope is chosen for high thermal shock resistance in high-speed heating zones, and the filament geometry is tuned to deliver repeatable heat distribution across the preform wall. Why it holds up in practice Compatibility is the whole point. The bulb is built to fit Krones Matrix, Contiform, and HyPET series blow molders, which gives you one consistent spare across multiple platforms. That translates into less time on the lamp cart, fewer parameter retuning jobs, and fewer line stops. On the floor, you get tighter control over preform heating, which cuts rejects from uneven stretch and helps keep bottle weight and clarity consistent. Energy use stays predictable because the output curve holds steady over the life of the bulb. A few shop-floor reminders Installation is straightforward, but the heating tunnel is a harsh environment. Make sure the reflectors are clean and aligned, and check that the lamp holder contacts aren’t oxidized—those issues cause voltage drop and uneven performance, even with a good bulb. Also, match the emitter to the zone. Preform heating demands precise control, so don’t mix emitter types across heating sections. Schedule replacements around planned maintenance windows to keep your heating profile stable.