Highly refined cellulose coating layers for oxygen barrier and recyclable paperboard packaging
A cellulose-based coating technology for paperboard that delivers excellent oxygen barrier performance while enabling clean fiber recovery during recycling. The coating acts as a sacrificial layer that separates polyethylene laminates from paperboard fibers, improving recyclability of food and consumer packaging.
Overview
This technology applies highly refined cellulose (HRC) layers onto paperboard to provide excellent oxygen barrier performance while simultaneously improving the recyclability of polyethylene (PE)-laminated packaging. The HRC layer functions as a sacrificial interface that enables clean separation of PE films from paperboard fibers during recycling, resulting in higher fiber recovery rates and reduced contamination.
The solution addresses two critical challenges in sustainable packaging: extending shelf life through oxygen barrier protection and enabling circular-economy-compatible end-of-life processing. It is well suited for food packaging, consumer goods cartons, and other applications where paperboard is combined with polymer laminates for barrier functionality.
Technical specifications
- Oxygen barrier: HRC layers (comprising nano- and microfibrillated cellulose films) demonstrate strong oxygen barrier properties when applied to paperboard substrates.
- Sacrificial separation layer: The cellulose coating enables clean detachment of PE films from paperboard fibers during pulping and recycling operations.
- Improved fiber recovery: Laboratory tests confirm that paperboard laminated with PE shows significantly higher fiber recovery when an HRC interlayer is present.
- Coating method: A laboratory-developed application process is used to deposit HRC onto paperboard, with PE film subsequently laminated on top.
- Characterized properties: Oxygen and moisture barrier performance, along with fiber recovery during recycling, are the key validated metrics.
- Scalability path: Pilot-scale coating of HRC and pilot-scale extrusion coating of PE (for example, in collaboration with polymer manufacturers) represent the next scale-up steps.
Technology readiness level
The technology has been validated at the laboratory scale through published studies demonstrating both oxygen barrier performance and improved fiber recovery in recycling trials. Current and planned work includes coating paperboard with HRC in the laboratory, laminating PE film, and characterizing barrier and recycling properties. A pilot-scale validation pathway is available for sponsors seeking accelerated development, including potential collaboration with industrial partners for pilot extrusion coating of PE onto HRC-treated paperboard.
About University of Maine
The University of Maine is a comprehensive public research university and the state’s flagship, coupling broad academic depth with an applied, industry‑oriented culture. On campus, companies access large‑scale prototyping facilities, pilot‑scale lines, and specialized test tanks that move concepts toward deployable systems. A statewide Cooperative Extension and field sites connect R&D teams to real‑world conditions across Maine’s coastal, forested, and cold‑weather settings, while industry liaisons streamline sponsored research. Funding comes from competitive federal sources such as the National Science Foundation, Department of Energy, U.S. Department of Agriculture, and the National Oceanic and Atmospheric Administration, while a centralized tech transfer office supports IP, licensing, SBIR/STTR, and startup formation.
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