Patent ID: 7516505
Filing Date: 2009-04-14
Classification: D06F

Abstract:
1. A dry cleaning method, which includes the steps of supplying a solvent for dry cleaning without a surface-active agent into a process tank for cleaning objects, collecting the solvent from the process tank as a collected solvent, and recycling substantially whole volume of the collected solvent as the solvent to be supplied to the process tank after removing dirt component in the collected solvent by distillation-and-condensation process, the dry cleaning method further comprises the steps of: storing the solvent to be supplied to the process tank in a supply tank; collecting the solvent continuously from the process tank; supplying the collected solvent to the distillation-and-condensation process; replenishing the solvent in the process tank by supplying continuously the solvent from the supply tank to the process tank; monitoring contamination level of the solvent being supplied continuously from the supply tank to the process tank and that of the collected solvent being collected continuously from the process tank and supplied to the distillation-and-condensation process; and ceasing process of dry cleaning operation for the cleaning objects in the process tank when the contamination level of the collected solvent being collected from the process tank and supplied to the distillation-and-condensation process is decreased until a difference of the monitored contamination levels reaches to a predetermined value after starting dry cleaning operation for the cleaning objects.