Laminated paper is a composite material in which plastic particles are coated on the surface of the paper through a casting machine. The main feature is that the composite material is oil-proof, waterproof (relative), and heat-sealable. Different uses have different characteristics: When used for packaging burgers, take advantage of their oil-proof properties. McDonald's is edible vegetable oil at 80 degrees for 10 minutes without oil leakage. When used in coated paper packaging, take advantage of its waterproof properties. When used in automatic packaging machines, take its heat-sealable properties.