Client Background
Our client is a rising brand in the global carbonated beverage industry, specializing in craft sodas and sparkling water. Targeting the European and North American markets, they were seeking a reliable glass bottle supplier that could deliver packaging capable of withstanding the internal pressure of carbonated drinks—critical for maintaining product quality and brand reputation during storage and transportation.
Core Pain Point
The client was facing a persistent and troublesome issue: severe cap leakage during storage and overseas shipping. The original caps were poorly matched with the bottle mouth, resulting in poor sealing. Coconut oil seeped out from the gap between the cap and bottle, causing product loss, packaging contamination, customer complaints and return requests, which directly affected their brand image and export business stability.
Our Custom Solution
The client encountered two urgent issues with their initial glass bottle packaging:
1. Frequent Bottle Mouth Cracking: The original bottles featured thin neck and mouth structures, which failed to withstand the 3.0–4.0 bar internal pressure of carbonated beverages. This led to cracking at the bottle mouth during filling, storage, and even shelf display, resulting in product leakage and safety hazards.
2. Inability to Adapt to Custom Pressure Requirements: Different craft soda formulas had varying carbonation levels, but the previous supplier provided a one-size-fits-all bottle design. This mismatch caused inconsistent performance, with some batches experiencing a 15% cracking rate during transportation.
Accurately measured the size, thread and sealing surface of the original glass bottle mouth
Optimized the cap structure and internal sealing gasket, adjusted the cap size and radian to perfectly fit the bottle mouth
Conducted repeated trial assembly and leakage testing to verify the matching degree between the improved cap and bottle
Final Result & Data Feedback
- Dramatic Reduction in Damage Rate: The optimized bottles reduced the transportation and storage cracking rate from 15% to 0.3% across 100,000+ units shipped, eliminating product waste and safety risks.
- Perfect Adaptation to Carbonated Drinks: All bottles passed the 4.5 bar pressure test without any mouth cracking or deformation, fully meeting the packaging requirements for the client’s full range of carbonated beverages.
- Client Cost Savings: The low damage rate cut the client’s annual replacement and loss costs by $68,000, while the custom pressure design enabled them to launch 3 new sparkling beverage SKUs smoothly.
Our Custom Solution
To address the client’s pressure-resistant packaging needs, we developed a targeted, data-driven solution:
1. Structural Optimization for Pressure Resistance: We thickened the bottle mouth and neck area by 1.2mm, reinforced the transition zone between the bottle shoulder and neck, and adjusted the internal curvature of the mouth to distribute pressure evenly and eliminate stress concentration points.
2. Custom Pressure Testing & Calibration: We conducted pressure tests tailored to the client’s specific beverage formulas, measuring the exact carbonation pressure (ranging from 2.5 bar to 4.5 bar). We then adjusted the glass formula and annealing process to ensure each bottle type could withstand 1.5 times the actual product pressure (a safety margin exceeding industry standards).
3. Batch Validation Testing: Before mass production, we performed 72-hour pressure holding tests and drop tests on sample bottles. Only batches with zero cracking or leakage were approved for full-scale manufacturing.
