Tackiness describes the interaction between 2 layers of identical (autohesion) or different (cohesion) materials in terms of surface stickiness.
The higher the stickiness between 2 layers which are in physical contact to each other, the higher the tack or the peel force required to separate the 2 layers from each other. The tack activity between the 2 surfaces which are in contact will be influenced by temperature, humidity and time and can be measured easily by determination of the peel force.
This effect is caused by the altered intermolecular structure of the rubber compound. Reducing the tackiness is an undesirable effect, especially for manufacturing tires.
The extension for the DMA GABO Eplexor®® is useful for testing the tack or peel force. This is the force which is being used for separating two test samples glued together. The figure on the right shows the tack force over time. The figure on the left depicts the tack or peel force and the calculated tack energy (integral).