Composite residual biomass packaging with fiber and biopolymer coatings for oxygen and moisture barrier

Overview

This proposal presents a sustainable packaging concept that combines fiber residual biomass with biopolymer coatings derived from starch, protein, and gums to create composite materials with reduced oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). The approach seeks to replace conventional cast-film packaging with bio-based composites, leveraging abundant agricultural residues such as plantain fiber, which have already shown promise in molded utensils and plates. By combining structural fiber components with barrier coatings, the concept aims to deliver packaging that is both functional and environmentally responsible.

The core challenge addressed is achieving homogeneous composite structures that avoid porous defects or channels that would compromise the gas and vapor barrier performance. Additives such as emulsifiers may be incorporated to improve rheological, mechanical, and physical properties, as well as to enhance stability across varying temperature and humidity conditions.

Technical specifications

Key features:

• Fiber residual biomass provides structural integrity, reducing reliance on cast-film materials
• Starch-based coatings offer low oxygen permeability, drawing on well-established film-forming properties of amylaceous residues
• Protein and gum coatings contribute low water vapor transmission, complementing the starch barrier layer
• Emulsifiers and adjuvants improve homogeneity, stability, and mechanical performance under varying temperature and humidity conditions
• Composite processing requires careful control to eliminate porous defects and channels that degrade barrier performance
• Multi-material layering may require two complementary technologies: one for preparing the coating formulation and one for applying it to the fiber substrate

Technology readiness level

This concept is at an early, pre-experimental stage. The hypothesis has not yet been validated, and the proposing team currently lacks the specialized equipment needed to conduct OTR and WVTR laboratory assays. The proposed validation pathway begins with laboratory testing of individual fiber and coating materials, followed by identification of optimal combinations and processing conditions, then composite fabrication and evaluation of mechanical, physical, and barrier properties. The proposers are seeking institutional partners with testing capabilities to advance this concept from idea to validated prototype.