Lamination machines for flexible packaging industry are used to join together different webs creating a single web composed of a multi layer structure. Laminators coat a glue on a primary material and laminates secondary material onto it. A duplex laminator will joins 2 layer of web, a triplex lamination machine will join 3 layers together in 1 pass. Coating machines are used to apply a layer of coated material onto a web (support). Depending on their construction and the construction of their coating units, laminators can apply different types of glue. Typical application for flexible packaging are solventless laminators which employ a 2 component glue. Dry and wet bond laminators use solvent base or water based glues. In flexible packaging industry are also common , so called, combi machines. These employ an interchangeable trolley system which allows different types of coatings or laminations depending on available trolleys. Coatings used in packaging industry are various. Cold and hot seal coating are common. Also, cold and hot seal coatings are commonly used, as well as hot melt and wax coatings. Silicon, Pvdc coating, ant mist and many others are employed. Materials which can be coated with a certain machine depends highly on the type of coating unit(s) available, on machine's construction and equipment.