Tantec's corona Treater is for surface treatment of plastics and metal. The simplest definition of corona treating is that it is a way to increase the surface tension of a material. Increased surface tension means that other materials—such as a laminating film or printing ink—will adhere better to the treated material.
Corona treatment, in effect, chemically roughens the surface (raising the surface tension), allowing it to grab onto the ink, coating, or adhesive being applied. In reality, the resulting chemical bond that occurs is better than a simple mechanical bond with the surface.