Table of Contents
Journal of Industrial Engineering
Volume 2014, Article ID 623510, 6 pages
http://dx.doi.org/10.1155/2014/623510
Research Article

Validation of Methods for the Optical Characterisation of the Wettability of Polymeric Films for Food Packaging

Dipartimento di Ingegneria Industriale e dell’Informazione e di Economia (DIIIE), University of L’Aquila, Via G. Gronchi 18, Loc. Campo di Pile, 67100 L’Aquila, Italy

Received 9 May 2014; Revised 10 October 2014; Accepted 13 October 2014; Published 23 October 2014

Academic Editor: Gabor Szederkenyi

Copyright © 2014 Giulio D’Emilia and Emanuela Natale. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A methodology is described for the theoretical-experimental evaluation of the measurement uncertainty of the polar and dispersive components of the surface free energy (SFE) in polypropylene films; these parameters are related to the film wettability of adhesives and inks. The proposed method is based on the measurement by means of a vision system of the contact angles of liquid drops deposited on the film itself, which allows for obtaining, through mathematical models drawn from the literature, the physical quantities of interest. The effect of the principal influence parameters has been experimentally evaluated, and testing has allowed the defining of the technical procedures readily transferable in the industry. The uncertainty assessment is interesting not only to correctly evaluate experimental data but also to characterise the reproducibility of the effects of techniques for improving the wettability of films, such as surface treatments.