More about Hot Melt Adhesives

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Also known as thermoplastic adhesives, hot melt adhesives are adhesives that are melted from a solid form and applied to the surface being bonded, and then dry rapidly. Solvent-free, they generally melt at temperatures above 180 degrees Fahrenheit and are used in a variety of packaging, labeling and assembly applications. Glue sticks applied by a glue gun are also popular adhesives for a variety of crafts and hobbies, as they can adhere to numerous surfaces.

Due to their heat sensitive nature, hot melt adhesives are generally not suitable for use in high-temperature environments or with heat-sensitive substrates. However, they are typically easy to apply and often low cost, and are therefore used extensively in certain high-volume operations. In addition, they generate minimal waste and have relatively small environmental impact. Other uses for hot melt adhesives include bookbinding, laminating and cobbling.

Among the common polymers used in the production of hot melt adhesives are polyurethane reactive, styrene-isoprene-styrene and styrene-butadiene-styrene, although these polymers typically serve as the base for the adhesive, not as the adhesive itself. Normally, waxes, plasticisers and other materials are added to the mix to enhance certain attributes, such as flexibility and strength.

A variety of hot melts are available, including polyamide, block copolymer, APAO and EVA melts, each of which has certain advantages. APOA melts, for example, are inexpensive, relatively flexible adhesives that offer good resistance to acid; polyamide hot melts are designed for strength and resistance to heat. The precise qualities of these adhesives depend on the exact composition of materials used in their manufacture.

Hot melt adhesives generally require a dispensing tool or applicator, such as a glue gun or drum unloader. These devices range from simple, handheld units to industrial bulk production systems. When selecting a dispenser, it is important to consider the adhesive to be applied, control options, production requirements and the capacity and size of the unit.