Tackiness Tester (Rolling Ball Tack Tester) This is an instrument to test the tackiness of pressure sensitive adhesive coated on BOPP film, tape or Label stock. Principle : This equipment is designed as per specifications of Pressure Sensitive Tape Council (PSTC). A steel ball is allowed to be rolled down from a specific starting point on the grooved path inclined at a specific angle to the base of the test platform. The pressure sensitive tape is affixed (tacky side up) just beneath the end of the inclined grooved path of the platform. The rolling ball attains maximum velocity at touch down and roll above the tacky surface which retards its motion by virtue of resistance offered by the adhesive till it stops the ball. The shorter the distance traveled the better the adhesive quality. Significance : The tackiness of the adhesive coating should be monitored regularly. A low tack means that the Tape / Label will not stick to the intended surface. A high tack means that the Tape / Label will stick on to the surface but will slip very easily if shear action is applied to it. A medium tack is the most idea for Packing Tapes as it will give an optimum Shear Resistance with economic Adhesive coating. A high tack is idea for Labels / Medical Plasters as they are not subjected to shearing action. This equipment is relevant to : Adhesive manufacturers. BOPP Tape manufacturers. Label manufacturers Heavy End-Users of packing tapes / labels. Research Institutions. Packaging Development centers.