Painting And Coating Systems ENVIRONNEMENT et TECHONOLOGIE DE TRAITEMENT DE SURFACES

Metallisation by evaporation

The Process

In general, the term « metallization » by evaporation means sublimation and condensation {deposit} on a sub-layer of a thin film of metal in low pressure condition of approximately 10-4 Torr. The low pressure (empty) allows the molecules of metal to move of the evaporation source until the surfaces to métalliser without the obstacle of the air or other gaseous particles.

The industrial version of metallisation most known is that which occurs by sublimation or evaporation which allows a deposit of aluminum on a manufactured product.

On the molded plastics to effect « Polished Mirror », the deposit occurs directly after the pre-treatment plasma in the House of metallization.

On all other materials or on plastics including the quality of the surface obtained is not « Polished Mirror » ,In general it must prepare an insulating layer and levelling the more often from varnishes U.V.,which enables to obtain a surface without fault and to increase the adhesion of the layer of metal ,and then apply a varnish finish, allowing to improve the qualifications of mechanical resistance, to shocks or scratches for example .

The layer has three fundamental functions different for a better success of the process:

Insulating

aesthetic functional

interface allowing the adhesion of the following layers.

The aluminum and other metals deposited have a role aesthetic and functional.

It is estimated that 60% of the applications of the metallization are fundamentally aesthetic, and used in decoration, but the application of functional type are increasing rapidly thanks to the gradual transformation of the galvanic processes, very expensive and very dangerous for the environment.

■ It was prepared of the cycles multiétages intended to cycles of metallisation for lights for vehicles and parables for the reflectors in general with the following range for example:

-plasma treatment

-Metallisation by evaporation with aluminum

-polymerization of plasma (in a single process) intended to the electronic sector and the electromagnetic isolation

  • Intended for the electronic sector and of the electromagnetic isolation

  • reserved for aesthetic cycles of metallisation , the transparent finish is today carried out in large part with u.v. varnish Colorless, which allows you to give a bright aspect and glassy which amplifies the effect of brilliance and the image definition refléchie by the layer of metal deposited, with decorative results in the framework of the aesthetics and functionality. The layer of finishing, which can also be of color; also plays a very important role for the protection of the metal deposited, both at the level of the resistance to oxidation and the mechanical resistance to chemical attack (perfumes, essences, sweating) and complete a cycle of COATING Composed of a Multilayer package strongly cohesive.
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