Hydrocolloid-based coatings applied on biobased/biodegradable food flexible packaging, A review. Part 1 - Biopolymer to coat and available technologies
Résumé
The shift towards sustainable food packaging has intensified research into hydrocolloid-based coatings applied to biobased and biodegradable flexible films. Indeed, most of the biobased and/or biodegradable film available for the food market exhibits too low properties, but that could be compensated by coating applications.This review explores the potential of hydrocolloids as coating materials to improve the functional properties of sustainable flexible packaging such as polylactides, polyhydroxyalkanoates, thermoplastic starch, polycaprolactone. Hydrocolloid-based coatings, including proteins, polysaccharides, and their composites, are particularly promising due to their ability to improve barrier, surface and mechanical performance while maintaining biodegradability and food safety.The choice of technique for coating application depends on the desired coating thickness, adhesion strength, and functional enhancements. Various coating technologies are discussed, ranging from solvent-free (dry) processes, such as extrusion-lamination and hot press techniques, to wet-based (solvent) methods, including solution casting, spray coating, electrospinning, etc. Surface treatments, such as plasma activation, are often required before coating application to enhance adhesion, wettability, and mechanical resistance. This review provides an in-depth analysis of available biodegradable polymer films suitable for coating and food applications and the coating technologies, setting the foundation for the development of next-generation eco-friendly packaging films.
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