Laminating consists basically of combining a web or sheet of aluminum foil with one or more other materials, such as paper and plastic films, using an adhesive, pressure, and usually heat for controlling adhesive viscosity, drying and/or thermo-setting the bonding agent. The resulting product is a sandwich of three or more layers, e.g., foil/solidified adhesive/and another material. For the most part, aluminum foil is laminated on web-fed, rotary equipment (Fig. 1) which also frequently includes a coating unit for coloring or otherwise pre-coating the aluminum foil

The laminating process requires that the rolls of foil and other material be unwound and that a controlled application of adhesive be applied to one or the other, or occasionally to both of these webs. This combination of foil, adhesive, and other material is then brought together when it passes through the nip of the combining rolls; (Usually one steel and one rubber roll). These apply just enough pressure to marry the materials into a single web.