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Wednesday, 01 April 2020
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Raw materials & technologies, Production and testing

Predicting the coating thickness

Wednesday, 18 April 2012

New research enables designing a flexible blade configuration to deliver the desired coating thickness onto a substrate.

Research helps engineers predict the coating thickness. Source: Barbara Eckholdt/Pixelio

Research helps engineers predict the coating thickness. Source: Barbara Eckholdt/Pixelio

Flexible blades are often employed to spread liquid coating thinly onto a flat smooth substrate. In a new study researchers from the University of Wisconsin-Madison (USA) derive a fifth-order nonlinear ordinary differential equation for the thickness of a Newtonian coating and for the corresponding blade deflection. After solving this equation numerically, a graph is produced to help engineers predict the coating thickness. According to researchers, blade deflection and coating thickness are governed by the blade angle and by a new dimensionless group called the "blade flexibility”. For values of blade flexibility less than one, the coating thickness matches that of a rigid blade. The results of this analysis provide an engineer with the ability to design a flexible blade configuration to deliver the desired coating thickness onto a substrate. Read the complete study in the "Journal of Coatings Technology and Research”, vol. 9, number3, pp. 269-277.

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