The rotogravure system CAVIMELT is the most commonly applied method for lamination. It is a printing system with an engraved roller, in which little cavities are engraved for transfer of the adhesive to the web substrate. Different patterns are available (round dots, pyramidal, nets, lines, etc.) depending on the laminated product.
Using the hot melt process this machine applies adhesive as dots or in predefined patterns using an engraved roller on film, web and textile substrates. Both reactive and thermoplastic adhesives can be used. The coating is generally used to laminate additional materials, or to alter the material surface.
A doctor blade seals the trough towards the engraved roll and cleans the surface of the latter. The web, lead between gravure roll and counter roll, is thus taking over the adhesive according to the engraving pattern.
The CAVIMELT process is similar to the rotogravure printing process. The molten adhesive is put in a heated trough which is longitudinally in contact with the rotating gravure roll. In this manner, the cavities of the gravure roll are filled with adhesive.