Troubleshooting Incomplete Base Formation in PET Bottles: The Servo Solution
Are you seeing "white spots" or incomplete petaloid base formation in your PET water bottles? This common defect often forces plant managers to increase blowing pressure unnecessarily, wasting energy and risking bottle bursts.
The Root Causes:
Thermal Gradient Issues: The preform base is too cold compared to the sidewalls.
Pressure Timing: High-pressure blowing occurs too late after stretching.
BANGE’s Expert Solution:
8-Zone PID Heating: Our ovens allow for granular temperature control. By increasing the intensity of the bottom heating zone by 3-5%, we ensure the material at the base is pliable enough for complex mold details.
Millisecond Synchronization: Using Schneider High-Speed PLC modules, BANGE machines synchronize the stretch rod's descent with the high-pressure valve opening at a millisecond level. This ensures the PET material is forced into the mold corners before it has a chance to cool.
Venting Optimization: We recommend a "Cross-Venting" mold design to prevent air-trapping in the base petals.
Need a technical audit of your production line? Join our LinkedIn Group https://www.linkedin.com/groups/21100003(ID: 21100003) and share your bottle photos for a free diagnosis from BANGE engineers.
