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Hot melt adhesive equipment ITW Dynatec

Hot melt EVA and PO

Hot melt adhesives are generally an adhesive with 100% solids based on thermoplastic polymers. They are solid at room temperature and are activated when heated above their softening point, at which stage they are liquid and can then be processed in a liquid state. After application, the hot melt can "benatten" the material and solidify when the materials are brought together. Upon solidification, the hot melt returns to the physical state that has structural integrity and then acts as a binder. The adhesive is applied by extruding (coating), rolling or spraying and still in the hot state to bond the materials.

Different polymers

The variety of polymers for hot-melt adhesives is very wide and includes both natural and synthetic polymers. The relatively high viscosity of the "molten plastic" makes this adhesive very suitable for porous and open substrates. These materials are difficult to bond with standard adhesives such as water-based adhesives and solvent adhesives. The most important property of hotmelts is usually that they build up their internal strength very quickly upon cooling, allowing for rapid assembly and further processing. Hotmelts based on thermoplastic polymers can be repeatedly heated to melt and then also cooled.

Heat resistance

 Thermoplastic hot melt has limited temperature resistance in addition, it has a tendency to creep, this is particularly pronounced when hot melt is exposed to continuous stress or elevated temperatures. On the contrary, hot melts are also used as a heat seal for reactivating surfaces.

Applications

Hotmelts are used in for many different applications in industry. The packaging industry in particular (production of packaging made of paper, cardboard and corrugated board) likes to take advantage of the fast binding time, or "drying time" of hot melt adhesives. Hot melts are also used in the printing industry for back gluing of books, in the textile industry, in the white goods industry for assembling appliances in the shoe industry for gluing shoe soles, for example. The wood processing industry uses hot melts for edging and lamination applications. The automotive industry uses hot melts for numerous applications, including bonding insulating and cushioning materials, joining and sealing headlights in metal frames and for hubcaps. The electronics industry also uses hot melts, when moulding electronics or securing wires to housing.

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