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A number of experimental investigations in the past have dealt with the influence of various parameters such as melt temperature, air gap distance and coating thickness on the bonding strength between a primed film and the coating. This paper presents a general procedure for obtaining a quantitative relationship,in order to predict the influence of individual parameters on the bond strength on the basis of dimensional analysis. The applicability of this method was demonstrated by evaluating the experimental results published in the literature which led to a practical formula for predicting adhesion as a function of the parameters mentioned. It was found that for a given temperature the shear history and the residence time of the melt in the air gap are of utmost importance to the adhesion between the film and the coating. The application of the formulas given, is explained by a number of numerical examples.
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Analyzing Air Gap Dynamics in Extrusion Coating by means of Dimensional Analysis, 2003 PLACE Confere