Differentiation of the drying time of paints by dynamic speckle interferometry

FACCIA P. A., PARDINI O. R., AMALVY J. I., CAP N.,GRUMEL E. E., ARIZAGA R., TRIVI M.

PROGRESS IN ORGANIC COATINGS

ELSEVIER SCIENCE SA

Año: 2009 vol. 64 p. 350 - 355

0300-9440

This work is part of studies of drying of paints using dynamic speckle interferometry (DSI), a technique based on the use of laser light. DSI is a non-invasive method that does not disturb the drying process. The sample is illuminated by a laser light from a source and the images corresponding to a phenomenon of interference called speckle are registered. If the surface shows activity, the interference pattern changes in time. Following this evolution, we can analyze the drying process by means of an image-processing algorithms. Therefore, it is possible to determine the temporal evolution of surfaces with different drying times. In thiswork the application of DSI to followthe drying process of paints with different drying times and drying velocities is presented. Different types of paints applied in different thicknesses of wet film and aerosol spray were analyzed. Quantitative measurements were obtained by analysis of the inertia moment of the co-occurrence matrix. Also, qualitative measurementswere obtained by sample activity. A new approach for monitoring simultaneously zones with different drying times is discussed and applied. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques. simultaneously zones with different drying times is discussed and applied. As in previouswork, resultswere compared with those from conventional techniques such as gravimetric analysis providing a good correlation between both techniques.