Method and apparatus for cryogenic blast cleaning

摘要

A hand-held device (2) is utilised for the cryogenic removal and vaccum collection of substances stuck to a surface (18), such as chewing gum (16) stuck to a pavement, walkway or road. A control box (8) is actuated to deliver a blast of dry-ice pellets/air mixture from a central pipe (4) onto the substance to be removed. The substance consequently freezes and becomes hard and brittle, breaking up into smaller fragments. The control box (8) is also actuated to induce suction in pipe(s) (6) simultaneously with the blasting of the substance, so that the fragmented substance is sucked up into the device (2). The device (2) is attached to an engineered skid package (32) mounted in a motor vehicle (24).