CAVIMELT rotogravure system

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.

There are different patterns available, depending on the laminated product.
The patterns can be regular or random round dots, pyramidal, nets, lines, etc.

Thermoset hotmelt adhesives are applied hot, in plasticized state, same as the thermoplastic adhesives, but they are not cross-linked at the time of application. The adhesives crosslink with humidity over a time period of some hours to 2 days, depending on the polymers. Contrary to thermoplastics, these adhesives are not plasticized again when they are reheated. The process is not reversible.

The adhesive is fed in plasticized form (molten) to a coating head. From the coating head, the adhesive is taken over by the engraved roller, the blank parts cleaned off with a special doctor blade. The adhesive is then transferred onto the substrate passing by on the pressure counter roller.

CAVISCREEN screen system

In the CAVISCREEN system, the hotmelt adhesives are transferred onto the substrates through a rotary screen, similar to the common textile printing method. The hotmelts are fed from the tank melter or drum melter through a heated and insulated hose to the inside of the rotary screen, just behind the doctor blade. The adhesive is distributed over the width of the fabric. The adhesive is by the doctor blade pressed through the screen onto the substrate (membrane, fabric, foam,