The Main patents for foods paperboard containers day again to the start of the last century. They were made mostly to provide a less expensive, lighter, far more functional option to glass for milk packaging. This utilizes recycled newsprint and that is molded into a shape which guards the eggs. https://wateringablepackaging.blogspot.com/2025/04/reshaping-packaging-with-eco-friendly.html
Gable top cartons - An Overview
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