Polyethylene Coating: A skinny layer of polyethylene on either side gives sturdiness. The outer layer safeguards the design and printing, though the inner layer functions being a sealant, making the carton absolutely leakproof. The main patents for meals paperboard containers day back again to the start of the last century. https://gabletoppak.blogspot.com/2024/10/the-future-of-eco-friendly-packaging.html