Polyethylene Coating: A Thin layer of polyethylene on each side delivers longevity. The outer layer safeguards the look and printing, though the interior layer acts like a sealant, building the carton fully leakproof. The very first patents for food paperboard containers date back to the beginning of the final century. https://dairycartonsustainability.fashion.blog/2025/09/24/carton-bottle-shaping-the-future-of-responsible-packaging/