Paper-based packaging manufacturer Smurfit Kappa has developed a barrier coating for food packaging that is both water- and grease-resistant. It is made from a non-hazardous opaque water-based liquid, which when dried forms an inert translucent film. The firm said the technology will enable packaging containing frozen foods or hot and cold greasy snacks to be made from corrugated cardboard, inside of metal or plastic. The coating will then prevent moisture from penetrating the cardboard surround. Smurfit Kappa said the coating is now being trialled by a major supermarket for use with its hot baked goods.

"Millions of tonnes of metal and plastic packaging is being used for convenience, snack and frozen foods, with major environmental implications," said general manager David Spencer. "This barrier coating will mean these formats can be phased out and replaced with recyclable cardboard."