Revisiting Dynamic Lap Shear Method for Evaluating Tapes
Intercept Time, Force at Intercept, Distance at Intercept, Peak Force, Distance at Peak Force, Distance to Initiate Shear, Complete Area of Work
For many decades the Static Holding Power test has been the accepted method of evaluating the shear resistance of a pressure sensitive adhesive. This classic method tends not only to give variable results, but they are then reported in mixed units, either as time to fall, or the amount of movement in a given time, making comparisons difficult. What is proposed in the conversion of this test to a dynamic one, by determining the force required to disentangle the molecular structure at a very slow rate. The proposed method is fully explained and examples given. The lap shear test is performed on the TA.XTPlus with constant data collection to generate many more attributes than available with the traditional method. Characteristics of individual adhesives were easily differentiated.