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Achieving <1% Oxygen Residual in Coffee Capsule Filling & Sealing | Vicanpacking
release time:
2026-09-19
Extend coffee freshness up to 18 months by controlling residual oxygen levels with precision nitrogen flushing in rotary capsule filling machines.
Freshly ground coffee releases aroma compounds that quickly degrade when exposed to oxygen. For single-serve coffee capsules, maintaining an ultra-low residual oxygen level (under 1%) inside the sealed capsule is mandatory to preserve crema, flavor, and shelf life.
The Mechanics of Sealed Chamber Nitrogen Flushing
Standard nitrogen injection nozzles often allow ambient air to re-enter before lid placement. Advanced capsule filling systems use an enclosed nitrogen purge chamber that floods the entire dosing and sealing zone with inert gas, displacing atmospheric oxygen prior to heat sealing.
Temperature and Pressure Balance for Foil Sealing
The lid sealing process requires precise synchronization of three variables:
1. Sealing Temperature: Controlled within ±1°C using PID controllers to prevent foil melting or incomplete seal adhesion.
2. Sealing Pressure: Pneumatic cylinders apply uniform pressure around the capsule rim, ensuring leak-free performance under pressure brewing.
3. Rim Dusting: Integrated vacuum heads remove coffee grounds from the rim, preventing micro-gaps in the heat seal.
Explore Our Solution: Check out our Rotary Coffee Capsule Filling Machine for live nitrogen flushing demo videos.
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