Cleaning system utilizing an organic cleaning solvent and a...

D - Textiles – Paper – 06 – L

Patent

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Details

D06L 1/02 (2006.01) B08B 3/12 (2006.01) B08B 7/00 (2006.01) C11D 7/50 (2006.01) C11D 11/00 (2006.01) D06F 43/00 (2006.01) D06L 1/08 (2006.01) C11D 7/26 (2006.01)

Patent

CA 2388500

A cleaning system that utilizes an organic cleaning solvent and pressurized fluid solvent is disclosed. The system has no conventional evaporative hot air drying cycle. Instead, the system utilizes the solubility of the organic solvent in pressurized fluid solvent as well as the physical properties of pressurized fluid solvent. After an organic solvent cleaning cycle, the solvent is extracted from the textiles at high speed in a rotating drum in the same way conventional solvents are extracted from textiles in conventional evaporative hot air dry cleaning machines. Instead of proceeding to a conventional drying cycle, the extracted textiles are then immersed in pressurized fluid solvent to extract the residual organic solvent from the textiles. This is possible because the organic solvent is soluble in pressurized fluid solvent. After the textiles are immersed in pressurized fluid solvent, pressurized fluid solvent is pumped from the drum. Finally, the drum is de-pressurized to atmospheric pressure to evaporate any remaining pressurized fluid solvent, yielding clean, solvent free textiles. The organic solvent is preferably dipropylene glycol n-butyl ether, tripropylene glycol n-butyl ether or tripropylene glycol methyl ether, a mixture thereof, or a similar solvent and the pressurized fluid solvent is preferably densified carbon dioxide.

L'invention concerne un système de nettoyage utilisant un solvant de nettoyage organique et un solvant liquide sous pression. Ledit système ne présente aucun cycle de séchage à air chaud par évaporation classique. Il utilise en revanche la solubilité du solvant organique dans un solvant liquide sous pression ainsi que les propriétés physiques du solvant liquide sous pression. Après un cycle de nettoyage au solvant organique, on extrait à grande vitesse le solvant des textiles dans un tambour tournant comme on en extrait les solvants classiques dans des séchoirs de nettoyage à air chaud par évaporation classiques. Au lieu d'exécuter un cycle de séchage classique, on trempe ensuite les textiles extraits dans un solvant liquide sous pression afin d'en extraire le solvant organique résiduel, puisque le solvant organique est soluble dans le solvant liquide sous pression. Une fois les textiles trempés dans le solvant liquide sous pression, celui-ci est pompé à partir du tambour. Enfin, le tambour est mis en dépression à la pression atmosphérique afin que le solvant liquide sous pression résiduel puisse s'évaporer, rendant des textiles propres exempts de solvant. De préférence, le solvant organique est l'éther n-butyl de dipropylène glycol, l'éther n-butyl tripropylène glycol ou l'éther de tripropylène glycol de méthyle, un mélange de ceux-ci, ou un solvant semblable, le solvant liquide sous pression étant de préférence du dioxyde de carbone densifié.

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