What Is Anchor Effect (for Adhesives)?


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Syed Asim answered
The anchor effect is when the adhesive performs the function of an anchor, a nail, or a wedge after is it spread into small dents on the surface of adhered and solidifies there. In some cases the adhesive behaves like a fastener, where concave and convex portions are stuck together elastically.

This kind of adhesion is seen in porous material such as paper, clothe and wood. However, the anchor and the fastener effects do not produce strong adhesive on because the bonding strength depends on the material strength of the adhesive and adhered, and the strengths (cohesion) of paper, clothe and wood are small.

In this adhesion mechanism, the adhesive must be spread into gaps and thus is must flow and wet the surface well. To improve the surface wettability different techniques of surface modification are used which improve the surface energy and hence the wettability of the adhesive over the material. To improve the adhesion strength, the strengths (cohesion) of adhesive and adhered materials must be improved. Different chemical ways are used to increase the strength of adhesives, like chemical cross linking, dipole forces development, and chemical bonding techniques etc. On the other hand the strength of paper and other substrates could also be improved through the proper selection of the fiber.

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