Laminating adhesives are used for large-area bonding of individual foils and films to form laminiadau fel PET/PE, neu PET/AL/PP. Mae priodweddau'r ffoil a'r ffilmiau unigol yn cael eu cyfuno yn y fath fodd fel bod y laminiad yn addas i'w ddefnyddio wedyn fel deunydd pacio ar gyfer pecynnu nwyddau, megis, er enghraifft, bwydydd, gofal iechyd, erthyglau meddygol neu fferyllol neu eitemau sy'n angen amddiffyniad rhag difrod cyn ei ddefnyddio gyntaf.
Gludyddion lamineiddio 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.
Oherwydd rheoliadau cyfreithiol, nifer cyfyngedig iawn o ddeunyddiau crai a ganiateir neu sy'n addas i'w defnyddio ynddyntgludyddion pecynnu hyblyg. 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.
