Method and apparatus for uniformly dispersing articles in a...

B - Operations – Transporting – 05 – D

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B05D 1/18 (2006.01) B05C 3/04 (2006.01) B05C 3/08 (2006.01) B05C 3/109 (2006.01) G02C 7/04 (2006.01) B05C 3/09 (2006.01)

Patent

CA 2204129

An apparatus and method for uniformly contacting an article with a treatment solution. Preferred embodiments are methods of uniformly tinting of contact lenses or uniformly surface modifying contact lenses. The method involves suspending the lens in the treatment solution by application of fluid flow, preferably sinusoidal or pulsed, in a direction opposite the stagnant force (i.e., sum of buoyancy and gravity forces) on the article. The fluid flow prevents the lens from contacting the container structure for periods sufficient to cause non-uniform treatment conditions, while continuously mixing the treatment solution to maintain uniform concentrations throughout.

On décrit un dispositif ainsi qu'un procédé destinés à mettre en contact, de façon uniforme, un article et une solution de traitement. Des modes de réalisation préférés comprennent des procédés destinés à teinter uniformément des lentilles de contact ou à modifier de manière uniforme la surface de celles-ci. Ce procédé consiste à tenir les lentilles en suspension dans la solution de traitement, par application d'un flux de fluide, de préférence sinusoïdal ou pulsé, dans une direction opposée à la force stagnante (à savoir la somme de la force ascensionnelle et des forces de gravité) s'exerçant sur l'article. Ce flux de fluide empêche les lentilles de rester en contact avec la structure du contenant pendant des périodes suffisantes pour provoquer des conditions de traitement non uniformes, tandis qu'il mélange continuellement la solution de traitement afin de maintenir des concentrations uniformes dans celle-ci.

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