3.Machining and processing HPL
Hot melt adhesives are used in many areas due to their high processing productivity and their environmentally friendly properties (no solvents). These adhesives can be found in almost all areas of modern production (surface laminating, edge laminating, production of abrasive materials, furniture manufacturing, car manufacturing, etc.). Hot melt adhesives differ in their chemical composition, which also determines the use of the product. There are ethylene vinyl acetate (EVA), polyamide, polyester, polyolefin and polyurethane hot melt adhesives. Reactive polyurethane hot melt adhesives are very frequently used for laminating different substrates with HPL.
Hot melt adhesives are available in different containers, depending on their
chemical composition. EVA, polyamide and polyolefin adhesives are often supplied as granulate in bags. Not every hot melt adhesive is suitable for pulverising and the production of adhesive films.
Polyurethane hot melt adhesives are always supplied in a vapour diffusion tight packaging, preventing humidity from entering during the stated storage time. Protective gas can be applied to the adhesive sticks or barrels in their packaging or they can be protected with vacuum packaging. They are applied using hot glue devices with heated hoses and application heads.
Table 9: Adhesives table
