Polyethylene Coating: A thin layer of polyethylene on both sides delivers sturdiness. The outer layer safeguards the design and printing, whilst the internal layer acts like a sealant, making the carton fully leakproof. The main patents for food paperboard containers date back again to the start of the last century. https://waterinpaperbottles.blogspot.com/2024/12/sustainable-solutions-for-soaps-and.html