Paper-plastic composites are both decorative and durable, and are very practical post-press processing techniques. Laminating is to apply plastic adhesive to the plastic film and print it with paper as the substrate, and then press the rubber roller and the heating roller to form a product of paper and plastic. The printed product laminated by the laminating machine has a thin and transparent plastic film on the surface, which makes the surface smoother and brighter, which not only improves the gloss and fastness of the printed product, but also prolongs the service life of the printed product. To waterproof, anti-fouling, abrasion resistance, folding resistance, chemical corrosion and other protection.

        The laminating process is widely used in various packaging, ranging from medicine boxes, handicraft boxes, to outer packaging boxes and various product packaging. The current lamination process includes pre-coating, dry lamination, and wet lamination. Among them, the pre-coated film has been seldom used because of the high cost. The wet method uses a water-soluble adhesive cold-bonding process. The dry-type compound traditional laminating process is to apply a solvent-based adhesive directly to the BOPP film and dry it in a drying tunnel. In the case of heating and pressurization, it is pressed against the printed matter. Due to the use of flammable and toxic solvents, it will cause greater harm to workers and the environment, and it is very likely to cause fire.