That absorption erodes the films' structure. They lose strength, and their gas-barrier performance drops sharply — which in practice means shorter shelf life and weaker product protection.

Consider a potato chip bag. If a CNF-based bag sat in high humidity, moisture could pass through the film and reach the chips, leaving them stale and soft. For some foods, moisture also encourages bacterial growth, raising the risk of foodborne illness.

What is wrong with today's packaging?

Many familiar products — chip bags, candy wrappers, squeeze pouches — combine multiple layers of petroleum-based plastics with materials like aluminum foil or paper. The layers are hard to separate, so standard recycling facilities often cannot process them. Much of this packaging ends up in landfills, where it can break down into microplastics that contaminate soil and water.

CNF films offer a renewable alternative, but their poor moisture performance has kept them out of widespread industrial use. This is the gap the plasma work targets: the treatment modifies the film surface to block water while preserving the cellulose's original mechanical strength and structural integrity.

Is the technology ready for factories?

Lavoine sees two practical advantages over traditional chemical coating processes, which consume large amounts of water, generate high heat and produce toxic waste. Plasma treatment avoids those burdens, making it more sustainable. And because the packaging industry already uses DBD plasma, the treatment could slot into existing manufacturing lines without a major retooling.

The study, led by Mirela A. Artner and colleagues and appearing in Applied Surface Science, applied organosilicon coatings through the DBD plasma process — depositing silicon-based layers directly onto the film surface.

What still needs fixing?

Real-world deployment is not immediate. Lavoine and her collaborators must first refine the process so it does not let water vapor leak through — the very failure seen with one of the tested coatings.

That permeability is not useless. For medical products such as breathable wound dressings, a film that lets vapor through is exactly what designers want. But packaging applications that demand moisture resistance would need the effect minimized.

The team also says further testing and optimization are required to assess:

• coating speeds on production lines,
• energy consumption,
• physical durability during real-world handling,
• economic viability and environmental safety.

Until those questions are answered, the under-1% absorption result remains a laboratory milestone rather than a shelf-ready product. Still, it shows that a dry, scalable, industry-familiar process can give plant fibers a property they lack naturally — and bring biodegradable packaging closer to the supermarket aisle.