The Principles And Structural Composition Of Food-Grade Coated Paper

The production of food-grade coated paper relies on a coating process, which involves uniformly coating plastic particles onto the paper surface through high-temperature melting, forming a thin film layer with a thickness between 0.01mm and 0.1mm. Taking coated paper with white kraft paper as the base material as an example, its basic structure consists of three layers: the bottom layer is high-stiffness, high-burst-resistance white kraft paper, providing support for the packaging; the middle layer is an adhesive resin, ensuring a tight bond between the paper and the plastic film; and the top layer is a PET or PE coating, giving the material oil- and water-resistant properties. This structure retains the environmentally friendly properties of paper while enhancing functional performance through the plastic film.