The variety of modern flexible packaging products that are available today would not be possible without modern adhesive systems. The evolution of the packaging industry has closely matched the development of new adhesive materials and production processes. These trends have led to high quality and technically demanding packaging structures required by the consumer. For many applications in flexible packaging, the use of a single material may not satisfy all of the properties demanded of the product. In these cases, a composite consisting of two or more layers of material may provide the desired performance.