Blow-Moulder Oven Temperature Drifts During Production

Compare preform exit temperature by heating zone and time, then check lamp output, reflectors, cooling air, voltage, ventilation, spindle rotation, preform spacing and sensor measurement.

Isolate high-pressure air, electrical power, heating circuits and motion energy before entering the guarded area. Treat hot oven components and pressurized blowing circuits as stored-energy hazards.

Locate the fault

• Bottle quality changes after the machine warms up
• Oven-zone output reaches limits
• One side of the preform is hotter
• Temperature drifts with ambient conditions or line speed

Inspection sequence

1. Trend zone output, measured preform temperature and bottle result through warm-up
2. Inspect lamp current and compare matched zones
3. Clean and inspect reflectors and ventilation filters under isolation
4. Verify spindle rotation and preform pitch
5. Check cooling-air flow and neck protection
6. Validate the temperature measurement against a controlled reference method

Corrective work

• Replace failed lamps in the approved balanced manner and restore clean reflectors
• Repair cooling fans, filters and airflow
• Service slipping spindles and transfer components
• Correct power connections or recalibrate the measurement channel

Operating records and follow-up

• Use a defined warm-up qualification
• Trend zone power at stable output
• Clean reflectors and filters
• Inspect spindle rotation
• Control oven recipes and record lamp replacements

Equipment details: Automatic Rotary Blow Molding Machine.