Hot Melt Adhesives is a thermoplastic adhesive that comes in the form of solid cylindrical sticks and is usually applied with a hot glue gun

 

Hot Melt Adhesives

Due to its adhesion capabilities, Hot Melt Adhesives is widely used in the packaging, automotive, nonwovens, product assembly, tapes and labels, woodworking, paper bonding, and electronics industries. It's a thermoplastic polymer made up of several polymers as well as additives including colours, resins, and stabilisers.

The gun melts the plastic glue using a continuous-duty heating source, which the operator pushes through the gun with a mechanical trigger mechanism or direct finger pressure. The glue squirted from the heated nozzle is hot enough to burn and blister flesh at first. When heated, the glue is sticky and hardens in a few seconds to a minute. Hot Melt Adhesives, which may be applied by dipping or spraying, are popular among hobbyists and crafts for affixing and as a cost-effective alternative to resin casting.

Hot Melt Adhesives have significant benefits over solvent-based adhesives in industrial applications. The use of volatile organic chemicals is minimised or eliminated, as is the need for drying or curing. Hot-melt adhesives have a lengthy shelf life and may normally be thrown away without extra care. Thermal burden on the substrate, limiting application to substrates not sensitive to higher temperatures, and loss of bond strength at higher temperatures, up to full melting of the adhesive, are only a few of the drawbacks. Use a reactive adhesive that cures further after hardening, whether by moisture (e.g., reactive urethanes and silicones) or UV radiation (e.g., reactive urethanes and silicones).

Properties of Hot Melt Adhesives-

·        Viscosity of melted wax

One of the most prominent features. Influences the wetting of the surfaces and the distribution of the applied adhesive. Temperature affects viscosity; a greater temperature reduces viscosity.

·        Indicator of melted flow

The molecular weight of the basic polymer is generally inversely proportional to this value. Because of the shorter polymer chains, high melt flow index adhesives are easier to apply but have poor mechanical qualities. Adhesives with a low melt flow index provide better characteristics, but they are more difficult to apply.

·        Stability of pot life

The degree of molten state stability, as well as the tendency to breakdown and char. Important in industrial applications where the glue is molten for a long time before being deposited.

·        Temperature of bond formation

Minimum temperature below which substrates do not get sufficiently wet.

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