Chitosan-based biodegradable coatings for flexible paper barrier packaging

Overview

This solution offers a sustainable alternative to conventional fossil-fuel-based packaging materials by leveraging chitosan, a natural polymer derived from food waste. Chitosan coatings and pulp blends provide significant mechanical improvements and barrier properties to paper and cardboard packaging. The approach addresses key industry challenges including fossil fuel depletion, bioenergy competition for food crops, and the need for biodegradable packaging. Chitosan is water soluble and can be recovered during paper recycling using mild acidic solutions, supporting circular economy goals.

Technical specifications

• Chitosan/pulp blends formulated with up to 50% chitosan content
• Mechanical strength increases of up to six-fold compared to pulp controls
• Elongation improvements from 1.5% to 7.2%
• Chitosan solutions with viscosities up to 20,000 cps
• Coated cardboard applications using less than 5% total weight per cm squared
• Mechanical strength increases of approximately 10% for chitosan-coated cardboard
• Water absorption reduced to 17% compared to 70% for uncoated cardboard
• Demonstrated biodegradability in marine water and soil
• Compatibility with existing roll and blade coating equipment
• Non-toxic additives available to further enhance water resistance and elongation

Technology readiness level

The technology has progressed beyond laboratory validation with optimized formulations demonstrating measurable improvements in mechanical and barrier properties. Basic chitosan/pulp blends and coated cardboard prototypes have been tested with documented performance gains. Future validation requires access to commercial products for further testing of mechanical and barrier properties. Additional accredited laboratory testing is planned to obtain more accurate water and oil barrier measurements. The technology is positioned for pilot-scale evaluation and collaborative refinement with packaging industry partners.