Adhesive Penetration of Wood and Its Effect on Bond Strength

摘要

The unusual porosity of wood makes it quite different from other substrates in that both the formulation of the adhesive and the bonding processes need to be particularly tailored for wood. In some cases the porosity is beneficial, but in other cases, it is not. Flow into the wood allows for more mechanical interlock and bonding area than is available with most substrates. However, this may allow adhesive to flow away from the glueline, leading to either a starved glueline or excess consumption of adhesives. Often the time that an adhesive sits on the surface is important either as open assembly time to allow water to evaporate and adhesive to penetrate into the wood, or closed assembly time for substrate-to-substrate transfer of adhesive and to allow the adhesive to penetrate the wood.