Compounding systems for hot melt or fusible adhesives

Today it is assumed that the first glue used by man was a hot melt adhesive. Birch bark resin pitch was used at least 45,000 years ago to glue stone and wood together for making weapons and tools. The various product classes range from pressure sensitive hot melt (PSHM) to hot applied hot melt (HAHM), to UV or heat activated reactive hot melt adhesives.

Hot melt adhesives have advantages over conventional adhesives in various ways. They are quickly processed, and rapidly become effective after cooling. Unlike solvent-based or 2-component adhesives, no hardening or reaction time is needed. Not only do they join widely different materials and surface types, but the joint also has a certain degree of flexibility. These special properties require nowadays special hot melt compounding systems.