Surface energy and how it affects adhesion

Surface energy and how it affects adhesion
January 24, 2018 tamtechbechspf418

Tamper evident tapes and labels are only as effective as the surface they are applied to. The surface condition must be considered: roughness, smoothness, porosity, coated, uncoated, cleanliness, flexibility, temperature conditions, wet or dry, and finally, surface energy of the surface

Tamper Technologies appreciate this and manufacture a range of security label and tape solutions using different adhesives, inks and films to ensure the best possible solution for customers.

All surfaces have energy associated with them, because work is needed to form them. These are the forces that are required to hold the molecules together to form the surface, whether it is a desk top or a cardboard box.

Surfaces can be referred to as having a low energy or a high energy. Low energy surfaces are for example; acrylic, plastics, rubber and composites. These surfaces are harder for labels and tapes to stick too. High energy surfaces are for example; glass and car paint are easier for labels and tapes to adhere to.

To understand the energy of a surface is easy, all you need to do is perform a simple experiment using a drop of water. Surfaces can be hydrophobic (hate water) or hydrophilic (love water). If the surface has a low surface energy the droplets will be raised with a high contact angle, as it is hydrophobic. A surface with a high surface energy is hydrophilic and has a low contact angle and the droplet is therefore flatter to the eye.