Apparatus and related method for rapid cure of sol-gel coatings

F - Mech Eng,Light,Heat,Weapons – 26 – B

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F26B 3/28 (2006.01)

Patent

CA 2432102

This invention resides in an apparatus (10) and related method for rapidly curing thin film sol-gel coatings, particularly such coatings adhered to low melting temperature plastic substrates (16), whether rigid or flexible, without deforming the substrate. The curing is achieved using IR heating lamps (18) and dry or humid hot gas flow. This curing densifies the sol-gel coating and provides desired optical and mechanical properties. The use of IR lamps (18) and hot-gas nozzles (20), either singularly or in combination, produces a rapid cure by effectively heating the thin film coating layer. In this manner, a sufficiently high temperature can be attained in the film layer, to densify the sol-gel coating, but for a sufficiently short time duration to avoid melting or otherwise deforming the substrate. The sol-gel coatings can be cured two to three orders of magnitude faster than with conventional oven curing, leading to significant cost reductions and manufacturing efficiency.

L'invention concerne un appareil (10) et son procédé associé permettant de durcir rapidement des revêtements sol-gel à films minces, en particulier les revêtements adhérant à des substrats plastiques (16), rigides ou flexibles, possédant une température de fusion basse, sans déformer ces derniers. Le durcissement se fait au moyen de lampes de chauffage infrarouges (18) et d'écoulement gazeux chaud ou humide. Le durcissement densifie le revêtement sol-gel et confère les propriétés optiques et mécaniques recherchées. L'utilisation de lampes infrarouges (18) et de buses de gaz chaud (20), de manière individuelle ou associée, entraîne le durcissement rapide de la couche de revêtement à film mince, sous l'effet du chauffage efficace. Ainsi, la température du film peut atteindre des températures suffisamment élevées pour densifier le revêtement sol-gel, mais pendant un laps de temps assez court pour éviter la fusion ou la déformation du substrat. On peut durcir les revêtements sol-gel avec deux ou trois ordres de grandeur plus élevés qu'avec le durcissement classique dans un four, ce qui permet de réaliser d'importantes économies sur les coûts et d'augmenter l'efficacité de fabrication.

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