The bonding of hot melt adhesives has certain requirements on the surface area of the mutual adhesive contact surface. Only by ensuring an effective contact surface can the bonding strength be guaranteed. This is the viewpoint of the adsorption theory and the intermolecular force theory. In order to increase the surface area of the hot melt adhesive, the following conditions must be met:
2. The surface tension is lower than that of the adherend.
3. The chemical structure is similar to that of the adherend, and the polarity is similar.
4.the bonding temperature is relatively high.
5. the adhesive should be as much as possible