Laminating adhesives are used for large-area bonding of individual foils and films to form lagskipt eins og PET/PE eða PET/AL/PP. Eiginleikar einstakra þynna og filma eru sameinuð á þann hátt að lagskiptið hentar til notkunar síðar sem umbúðaefni fyrir umbúðir vöru, svo sem td matvæli, heilsugæslu, lækninga- eða lyfjavörur eða hluti sem þarfnast verndar gegn skemmdum fyrir fyrstu notkun.
Lagskipt lím most often consist as a rule of isocyanate group-containing polyurethane binders. Most of the available laminating adhesive give, after cross-linking, are transparent appearance.
Vegna lagafyrirmæla er mjög takmarkaður fjöldi hráefna leyfður eða hentugur til notkunar ísveigjanleg umbúðalím. Besides their damage to the environment because of the high content of volatile organic solvents, the necessity of high energy consuming drying tunnels to flash-off those solvents to achieve the demanding prooperties, even the necessary adhesive lay down needed for the production of the laminates is about two times higher than the lay down regarding solvent-free adhesives. The laminating adhesive must also be resistant to an effect called "tunneling". which is the localized separating or delamination of the substrates caused by two films of different extensibility that stretch or relax at different rates. Other general considerations in selecting an adhesive for lamination include adhesion, mechanical bond strength, formulating flexibility, and heat and chemical resistance. One must also determine the ability of the adhesive to flow uniformly over the film's surface and form a smooth continuous coting.
