Abstract: A dispenser for viscous fluids includes a housing having a hanger assembly for suspending a collapsible bag with a dispenser outlet extending from an opening at the bottom of the housing, and a pair of rollers riding in parallel pairs of slots vertically extending in opposite sides of the housing. The rollers form a nip for receiving the collapsible bag whereby the rollers jointly doctor or extrude fluid in the bag toward the dispenser outlet at a substantially constant delivery rate in response to operation of the dispenser.

Abstract: A dry cleaning system particularly suited for employing supercritical CO.sub.2 as the cleaning fluid consisting of a sealable cleaning vessel containing a rotatable drum adapted for holding soiled substrate, a cleaning fluid storage vessel, and a gas vaporizer vessel for recycling used cleaning fluid is provided. The drum is magnetically coupled to a motor so that it an be rotated during the cleaning process. The system is adapted for automation which permits increased energy efficiency as the heating and cooling effect associated with CO.sub.2 gas condensation and expansion can be channeled to heat and cool various parts of the system.