Adhesive Lamination is a process by which two or more web substrates are bonded together using polyurethane adhesive system. Heat and pressure are supplied by nip rollers to improve the rate of reaction. During the process, web is corona treated to improve wettability and surface energy.
The different packaging structures manufactured by the flexible packaging industry would not be possible without the polyurethane adhesive system.
These systems, are critical in ensuring that certain mechanical properties are achieved within the film, especially when a single layer of a film cannot achieve the required performance, that’s when a composite multilayer of films is achieved by applying PU adhesive for two or more polymers.
Lamination of multilayer substrates has proven to be the key in achieving properties such as high bond strength, high tensile strength, high gas permeability, which results in a very complex lamination. Different lamination technologies are available for various applications, such as solvent-based dry lamination, solvent-free lamination, and water-borne lamination. Adhesive lamination involves application of adhesive systems to achieve multilayer structures with good mechanical properties on the laminate.
