Buyer questions · Purchase decisions
To prevent leaks during sea shipping, what specific pump head and bottle neck sealing parameters should I pay attention to when selecting vacuum bottles?
Leakage in vacuum bottles during sea shipping often stems from pump head and bottle neck seal failures. Critical parameters include pump head air-return structure, thread torque, inner cap material, and aluminum foil sealing methods. Conduct airtightness tests on the filling line to ensure flat seals and compliant torque, minimizing leakage risks. Specific solutions depend on viscosity and logistics conditions.
1Pump Air-Return & Dispensing Balance
Pump heads must feature smooth air-return structures to prevent negative pressure and interruption. Dispensing precision must meet standards to minimize residue. Air-return hole design must match viscosity; high-viscosity materials require optimized internal flow channels.
2Bottle Neck Threads & Sealing Process
Bottle material must match the sealing method. Electromagnetic induction sealing requires flat PP/PE necks; PET/PETG needs pressure-sensitive pads or composite gaskets. Thread torque must be controlled within 8–18 kgf·cm, with spot checks on the filling line to prevent leakage from vibration.
3Real-Material Verification & Low-Pressure Testing
Water-only testing is prohibited. Conduct rebound and residue tests with actual materials, simulating cargo hold low pressure. For volatile content, perform 45°C inversion and low-pressure tests. Re-validate airtightness after supplier or mold changes; do not reuse old reports.
Follow-up questions
- Q:How to resolve vacuum bottle residue complaints?
- A:Optimize piston structure, add scraper design, and test residue rates after static resting post-filling.
- Q:Is air freight permitted?
- A:Alcohol-containing or aerosol products cannot be cleared for air freight without low-pressure and temperature cycle verification.
Updated 2026-09-18
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