Cleaning and liquid contact with solids – Processes – Including use of vacuum – suction – or inert atmosphere
Patent
1995-05-17
1997-02-18
Warden, Jill
Cleaning and liquid contact with solids
Processes
Including use of vacuum, suction, or inert atmosphere
134 23, 134 32, 134122R, 134153, 15302, 15345, B08B 302, B08B 504, A47L 514
Patent
active
056037759
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to apparatus for cleaning the surfaces of objects in movement, comprising at least one nozzle head including a housing forming an elongate suction nozzle that terminates in an orifice edge surrounding an opening, which suction nozzle contains a chamber including said opening, the suction nozzle being arranged spaced from said surface to form a circumferential gap between the surface and the orifice edge of the suction nozzle, the nozzle head also including at least one jet nozzle arranged in said chamber spaced from said opening in order to emit a jet of a treating liquid to produce a predetermined treatment area on said surface; pipe means including an evacuation pipe connected to the chamber of the suction nozzle, a supply pipe connected to the jet nozzle to supply treating liquid under pressure, and a vacuum source arranged to maintain a subpressure in the chamber so as, with the aid of air flowing in through said gap, to evacuate liquid and material released from the surface; and an actuator to move the nozzle head substantially perpendicularly to the direction of movement of the object, said nozzle head being arranged to be guided along the moving surface at a constant distance therefrom in order to maintain said gap.
The function of a roll rotating in contact with a material web is gradually deteriorated by material collecting on the shell surface of the roll. The degree of deterioration of the roll function varies from one area to another as well as the type of material and quantity thereof that collects. An example of such rolls is cliche rolls where printing ink adheres to the shell surface and collects so that the quality of the pattern to be transferred to the material web passing it is deteriorated. Also contributing to this deterioration is the fact that dirt and fibres collect in the ink layer and that this ink layer may be uneven both peripherally and in axial direction, the deterioration therefore appearing unevenly. One alternative for restoring the function of the roll has been to stop production in order to clean the shell surface by various means. Since falls in the production are not desirable, another alternative has been to use stationary aids such as brushes and scrapers to try to clean the shell surface during operation. Both alternatives are time consuming and troublesome to perform because the space around the roll is usually rather cramped. The latter alternative also means that brushes and scrapers become worn and their cleaning effect is in time reduced and they must be replaced at regular intervals. Material is collected in the brushes and they must also be cleaned. If scrapers are used they will wipe over some of the material when larger quantities have built up on the shell surface, and this material then remains. Cleaning in accordance with the first alternative must then be performed and continuous operation is impossible.
JP-63-004949 describes apparatus of the type defined in the preamble to the claims, but the moving surface is treated with an air jet and thus does not deal with the problems associated with the use of liquid as treating agent. Furthermore, air as treating agent is quite insufficient to achieve efficient and complete cleaning of the object. The air jet is not strong enough to break up hard layers of impurities on a moving surface and there is a risk of dust and other impurities being pressed out through the air gaps in the suction nozzle. The nozzle for the air jet is also mounted in the wall of the suction nozzle and the latter is asymmetrical in shape to extend obliquely into the chamber, so that the flow of air and impurities becomes uneven and difficult to control, particularly axially and radially inside the air gap. U.S. Pat. No. 3,737,940 describes a device based on mechanical cleaning with the aid of a rotating brush or soft roller journalled in a housing that extends longitudinally in the axial direction of the roll. The surface of the roll is sprayed with liquid, i.e. under negligible pressure, both before and aft
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Chaudhry Saeed
Warden Jill
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