630mm 800W Halogen Heating Lamp for Stretch Blow Molding Machines
We build this 630mm, 800W halogen heating lamp specifically for the heat zones of stretch blow molding machines. Its job is to bring PET preforms to the exact temperature window needed for uniform stretching and wall distribution. In practice, that means stable output, fast recovery after door openings, and a footprint that matches the machine’s existing lamp cavity.
Power, Dimensions, and Electrical Specs
The 800W rating is not arbitrary. It is sized to deliver the heat flux required to raise preform surface temperature quickly, without oversizing the heater and wasting energy. The 630mm overall length gives you coverage across the full heating section, while keeping the lamp compact enough to fit standard reflector assemblies and service openings. This lamp is typically specified for high-voltage operation, commonly 400V, because stepping the voltage up allows the same power to be delivered with lower current. Lower current means smaller wiring, simpler insulation requirements, and less heat buildup at the terminals. It also reduces voltage drop over distance, which helps maintain consistent temperature across the heating zone. The trade-off is real: higher voltage demands stricter insulation integrity and proper safety clearances during installation and maintenance. You must wire it up to the rated voltage and polarity, and keep terminal connections clean and tight.
Quartz Tube, Halogen Fill, and R7s Termination
The heating element is housed in a quartz tube. Quartz handles high operating temperatures and resists thermal shock when the lamp cycles on and off. The halogen fill is key to long life. It enables a regenerative chemical cycle that redeposits evaporated tungsten back onto the filament, reducing blackening of the tube and keeping light output stable over time. The R7s double-ended connector is standard in industrial heating lamps for a practical reason. It provides strong mechanical support at both ends of the tube, aligns the lamp inside the reflector, and transfers heat away from the terminals. It also makes replacement a drop-in job—slide the lamp in, align the pins, and lock it down. We apply a coating on the quartz in many versions to cut infrared radiation and shape the spectral output. The benefit is more heat delivered to the preform and less wasted as radiant energy that heats the machine frame, wiring, and sensors.
Application in Stretch Blow Molding: Control, Reliability, and Serviceability
In stretch blow molding, the heating profile is everything. Preforms must reach a uniform temperature before stretching; uneven heating causes thin spots, stress marks, or weak seams. This lamp is engineered for fast response and stable output, so you can hold setpoint despite door openings, part changes, and cycle interruptions. The 630mm length and 800W power density are matched to the typical heating tunnel geometry. You get even coverage across the preform body, with enough reserve capacity to recover quickly after a short stop. The R7s termination simplifies field replacement and reduces downtime—no special tools, no complex terminations. The harsh environment of a blow molding cell is no secret. Vibration, airflow, and thermal cycling take a beating on any component. This lamp is built to survive it, but you still need to manage airflow and cooling. If the machine’s cooling system is undersized, ambient temperature climbs, shortening lamp life and drifting temperature control. For engineers, the payoff is straightforward: a lamp that specs out cleanly, installs as a direct replacement, and holds temperature consistently. That is how you keep cycle time stable and scrap low.