Biopolymer-laminated paper packaging with reduced water and oxygen transmission rates
Sustainable paper-based flexible packaging using biopolymer lamination with optional aluminum oxide coating to achieve industry-required water vapor and oxygen transmission rates while maintaining repulpability for recycling.
Overview
This research develops paper-based flexible packaging laminated with biopolymers designed to significantly reduce water vapor transmission rate (WVTR) and oxygen transmission rate (OTR). The solution addresses the packaging industry's need for sustainable alternatives to traditional multi-layer plastic packaging while meeting the barrier performance required for food and product protection. The approach uses single or multilayer biopolymer lamination structures, with optional aluminum oxide (AlOx) coating for enhanced barrier properties. A key advantage is the prioritization of water-soluble biopolymers that preserve the repulpability of paper, enabling the packaging to be recycled through standard paper recycling streams.
Technical specifications
Core technology components:
- Multilayer biopolymer lamination applied to paper substrates in either single-layer or multilayer configurations
- Aluminum Oxide (AlOx) coating as an optional barrier layer to further reduce WVTR and OTR
- Water-soluble biopolymers prioritized to maintain paper repulpability for recycling compatibility
- Customized paper formulation including fiber source selection, binders, fillers, sizing agents, and retention agents
- Surface treatment technologies to improve adhesion between paper substrate and biopolymer lamination
Validated performance benchmarks from prior research:
- Starch-based nanocomposite films with antimicrobial agents achieved OTR of 10 cc/m²/day and WVTR of 100 g/m²/day at 23°C and 55% relative humidity
- Multilayer biopolymer films previously developed met required OTR and WVTR specifications
Testing protocols planned:
- Bond strength between paper and lamination layers
- WVTR and OTR measurements
- Gelbo Flex test for durability
- Heat seal strength evaluation
- Coefficient of friction (COF) testing
- Caliper and basis weight measurements
- Tearing resistance and tensile breaking strength tests
- Repulpability testing at the Wisconsin Institute for Sustainable Technology
Technology readiness level
The technology is currently at an advanced research and development stage. The principal investigator's laboratory has already developed multilayer biopolymer films that meet required OTR and WVTR specifications, and starch-based nanocomposite films have demonstrated promising barrier properties. The research team brings complementary expertise, with the lead investigator contributing biopolymer film development and a co-PI contributing paper science knowledge including formulation of sizing, fillers, and retention agents. The next phase will focus on optimizing paper formulations and surface treatments for adhesion, developing multiple biopolymer lamination configurations, conducting comprehensive performance testing, and validating repulpability through an independent institute. The project is positioned to deliver a sustainable packaging solution that balances barrier performance with end-of-life recyclability.
About University of Wisconsin, Stout
University of Wisconsin–Stout is Wisconsin’s polytechnic university, a comprehensive public institution focused on applied learning and career-integrated education. Industry collaboration is embedded through a well-established co-op and internship program and company-sponsored capstones, giving partners access to talent and problem-solving teams. On-campus applied research and prototyping facilities, including digital fabrication spaces and test labs, are available to external collaborators with professional staff support. Located about an hour from Minneapolis–Saint Paul and in the Upper Midwest manufacturing corridor, Stout offers convenient access to regional suppliers and OEMs. Faculty secure competitive federal and state support—often from NSF and USDA—augmented by industry-sponsored projects, while technology commercialization is coordinated through a dedicated office in partnership with a system-affiliated foundation.
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