Reducing the "Burst Rate": Root Cause Analysis and Pressure Curve Optimization
Problem: High burst rates (above 0.5%) are a silent profit killer. Whether it’s during the blowing stage or later during carbonation filling, a burst bottle indicates a failure in the Thermal-Pressure Balance.
Expert Diagnosis by BANGE Machine: Through our technical audits in plants across Mexico and Ecuador, we’ve identified two primary culprits:
The "Pearlescence" Trap: Over-stretching the PET material beyond its natural limit creates microscopic stress fractures.
Solution: We optimize the Pre-Blowing Pressure (P1). By adjusting P1 between 6-12 bar via our precision Seitz valves,
we cushion the material before the 40 bar high-pressure blow.
Infrared Over-Penetration: If the preform surface is too hot, the molecular chains "slip" instead of stretching, creating thin spots that burst under pressure.
Solution: BANGE’s Integrated Air-Cooling Array ensures the preform surface remains under 100°C while the core stays pliable, maintaining the material's intrinsic viscosity (IV).
Pro Tip: Always check your High-Pressure Timing.
If the blow starts 10ms too early, you risk base bursts. BANGE’s PLC allows for 0.001s timing adjustments to find that "Sweet Spot."
Facing high scrap rates? Share your production logs in our LinkedIn Grouphttps://www.linkedin.com/groups/21100003/ (ID: 21100003) for a data-driven review by our specialists.
