A Short Introduction to Hot Melt Adhesive
Hot melt adhesive is a form of thermoplastic adhesive which is commonly supplied in solid cylindrical sticks of various diameters, designed to be melted in an electric hot glue gun. The gun uses a continuous-duty heating element to melt the plastic glue, which the user pushes through the gun either with a mechanical trigger mechanism on the gun, or with direct finger pressure.
In industrial use, hot melt adhesives provide several advantages over solvent-based adhesives. Volatile organic compounds are reduced or eliminated, and the drying or curing step is eliminated. Hot melt adhesives have long shelf life and usually can be disposed of without special precautions. Some of the disadvantages involve thermal load of the substrate, limiting use to substrates not sensitive to higher temperatures, and loss of bond strength at higher temperatures, up to complete melting of the adhesive. This can be reduced by using a reactive adhesive that after solidifying undergoes further curing e.g., by moisture, or is cured by ultraviolet radiation.
Hot melt adhesive, also known as hot glue, is a form of thermoplastic adhesive that is commonly supplied in solid cylindrical sticks of various diameters, designed to be melted in an electric hot glue gun. The gun uses a continuous-duty heating element to melt the plastic glue, which the user pushes through the gun either with a mechanical trigger mechanism on the gun, or with direct finger pressure. The glue squeezed out of the heated nozzle is initially hot enough to burn and even blister skin. The glue is tacky when hot, and solidifies in a few seconds to one minute. Hot melt adhesives can also be applied by dipping or spraying.
There are several special properties attributed to hot-melt adhesive sticks that help consumers and industrial workers know if the adhesive is right for their project. Pot life refers to how stable the adhesive is when melted and whether the glue can char before being dispensed. Melt flow describes how easily the adhesive can flow when molten, with higher levels having weaker bonds. The set time tells users how long it will take the adhesive to set and form a bond. If you want to know more about hot melt adhesives, cleck www.hotmelt-zp.com
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