Why do glass bottles have no cracks in the first batch but crack in the second batch?
How did we Solve the 700ml Rum Bottle Bottom Crack Problem ?
2026-03-10
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Why 700ml Rum Glass Bottles Develop Bottom Cracks in Second Production?
As a professional glass bottle manufacturer and rum bottle supplier,
we provide high-quality glass packaging for global spirits brands.
During production of 700ml rum glass bottles for export,
we faced a typical quality challenge:
- First production batch: perfect quality, no bottom cracks
- Second production batch: many bottles showed bottom cracks after annealing
This article shares the real cause and effective solution used in professional glass manufacturing.
Why Do Bottles Crack Only in the Second Batch?
The key reason is environmental temperature change.
- First batch: produced at around 20°C, warm and stable
- Second batch: sudden cold weather with large day-night temperature differences
When hot glass bottles leave the forming mold,
the thick bottle bottom directly touches a cold conveyor belt.
This rapid cooling creates strong internal stress,
which leads to obvious bottom cracks after annealing.
How Top Glass Packaging Manufacturers Prevent Bottle Cracks
Reliable glass bottle manufacturer and rum bottle supplier apply these controls:
- Stabilize ambient temperature, mold temperature and cooling conditions
- Avoid sudden cooling, especially on thick bottle bottoms
- Use batch tracing and full inspection for quality control
- Preheat conveyors to prevent cold surface contact in low temperatures
How We Solved the 700ml Rum Bottle Bottom Crack Problem
We immediately activated batch tracing and re-inspected all finished bottles.
The most effective solution was:
- Using a torch to heat and insulate the conveyor belt
- Maintaining stable surface temperature to avoid sudden cooling
After this adjustment, the bottom crack issue was completely resolved.
Our 700ml rum glass bottles returned to stable quality for formal export delivery.
Conclusion
For any professional glass packaging producer,
temperature consistency is the key to avoiding bottle bottom cracks.
Sudden cold and direct contact between hot glass and cold surfaces often cause hidden stress and cracks.
Preheating conveyors and stabilizing cooling conditions are simple, practical and highly effective solutions.
As a reliable rum bottle supplier and glass bottle manufacturer,
we always control every detail to ensure stable, export-grade quality.
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