In bonding technology, substrate or adherend means the material to which the adhesive is to be applied.
The surface of the substrate to be bonded is wetted with hot melt adhesive and then glued to another substrate.
Here, the surface to be wetted is of great importance for the quality of the bond. The surface of the substrate should always be clean and free from contamination. For this purpose, a certain roughness of the substrate is advantageous. The roughness creates a mechanical anchoring, which ensures that the adherends adhere optimally.
Release agents, cleaning agents or solvents can have negative effects on the bond. The use of primers is beneficial for good adhesion. A specific surface treatment treatment of the substrate is therefore essential.