Compostable Beverage Capsule Barrier Coating

The patent applies composite materials by combining compostable base layers with a barrier coating layer. The cartridge walls consist of multiple layers including compostable materials (such as paper or biodegradable plastics) combined with a barrier coating that provides oxygen and water vapor impermeability. This composite structure maintains environmental sustainability while preventing product degradation through the barrier properties of the coating layer.

The patent merges the protective barrier function with the cartridge wall structure itself by integrating a barrier coating layer directly onto the compostable wall layers. This eliminates the need for a separate secondary wrapper, as the barrier coating provides the necessary impermeability within the primary cartridge structure, thereby reducing total packaging material quantity while maintaining product conservation.

The patent applies local quality by providing barrier coating layers specifically at critical locations where oxygen and water vapor permeability would most affect product conservation, such as the bottom wall and closing wall that directly contact the foodstuff product. Rather than uniformly complexifying the entire structure, the barrier coating is strategically applied to provide necessary protection while minimizing overall structural complexity.