The process is to laminate different materials of various properties into a multi-material product.

For example, if you need a multi-material product that has a good barrier function as well as a high tensile strength, you can produce a material by laminating an aluminum foil of a superior barrier property along with a polymer film of a good tensile strength.

It may sound simple but it is rather a complicated process involving the multiple applications of various mechanical, chemical, electric,
electronic technologies.