How do I troubleshoot white haze at the PET bottle base and uneven wall thickness on a water filling line?

White haze at the PET bottle base and uneven wall thickness are typically caused by uneven preform heating, improper stretch-blow timing, or inadequate mold cooling. To resolve the issue, first confirm whether the defect is consistent across all cavities or isolated to specific positions. If localized, check infrared lamp output, preform rotation speed, and stretch rod alignment. If system-wide, verify preform batch consistency, compressed air quality, and cooling water flow. Adjust heating zones and blow pressure incrementally, inspecting sample bottles after each change. Ensure your blowing unit’s parameters match the rated capacity and bottle format specified for your line. If adjustments do not resolve the defect, provide your equipment supplier with preform specifications, current heating and cooling data, and defective bottle samples. Chuxin Mingwei supports clients with site-specific diagnostics and parameter optimization for integrated water treatment and filling systems. We recommend documenting baseline settings, testing one variable at a time, and scheduling a line audit if bottle quality impacts filling accuracy or cleanroom compliance.

When configuring your line, ensure the blowing unit, rinsing-filling-capping monoblock, and downstream equipment are matched to your specific PET bottle format, capacity range, and target output. Verify that compressed air quality, cooling water supply, and mold cavity count align with the preform specifications and bottle design. For integrated systems, confirm that the equipment is rated for still water applications and that all process parameters, including valve type and hygiene controls, are optimized for your production requirements.