Relot, Emmanuelle (2008) Physical and numerical modelling of dip-coating. PhD thesis Mécanique Numérique, CEMEF - Centre de Mise en Forme des Matériaux, ENSMP p.208.

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Abstract

Dip-coating is a process allowing the extraction of a thin layer of matter around a mould by dipping it in a bath of liquid. This is a common process extensively used in industries concerned, for example, with the application of protective or decorative coatings and also used to manufacture parts having a thin thickness such as gloves, mammal prostheses, medical capsules and condoms. The advantage of this process is its simplicity and its low cost; but it is difficult to control the thickness and its repartition around the object. The goal of this thesis is to numerically predict the thickness of the layer extracted on the mould. The mechanical and thermal balance equations are solved in the bath using a Lagrangian Finite Element approach with remeshing technique. The liquid/air interfacial tension is taken into account in order to avoid surface instabilities; the method used to implement interfacial tension in the modelling is based on the reformulation of the curvature with Laplace-Beltrami operator. Experimental researchs are also realized in order to characterize physically the liquids used in the bath.

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