Roughness Factor and its Implications, with Respect to Some Pressure Sensitive Adhesives, A Case Study of 3 Different Adhesives on 5 Mild Steel Plates with Varying Degrees of Roughness at the Surfaces

The presents the effect of some physical properties like droplet height, droplet diameter, contact angle and surface tension on pressure sensitive adhesives (PSA) acting on a rough surface, a case study of 3 different adhesives on 5 mild steel plates with varying degrees of roughness at the surfaces. A camera of high speed and resolution was used to capture the droplets of the adhesives as it makes contact with the mild steel plate and the results were analyzed in a computer to determine the contact angle, the height of fall etc. the values of the results were tabulated and plotted against the varying degrees of roughness. It was discovered that the higher the diameter of droplet, the more the roughness factor as seen by first degree roughness and 2nd degree roughness in evolstic PSA, it was equally discovered that araldite has more bonding force than top gum and evolstic, while top gum is the least bonding when height droplet is applied. And this shows that evolstic at 157.217o contact angle and 4th degree of roughness has more bonding force than other substance with araldite at 53o and 5th degree roughness having the least bonding strength. It could be deduced that Evostick at a value of 19.549?N/m has the highest surface tension at zero degree of roughness and top gum has the least at the same condition.