Spraying method and a spray system for coating liquids
AssigneeITW Oberflachentechnik GmbH & Co. KG
InventorRonald Steiger
Life of this patent
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Abstract
A spray system and a spraying method for coating liquids. An accessory liquid (10) wets the front, external surface's terminal zone (8) of the spray system (2) discharging the spray jet (6) of coating liquid, for instance the front terminal zone of the external periphery of a rotating atomizing bell (4), in order to prevent drying and layering of coating liquid (10) precipitated on the external surface.
Claims21
A method of spraying a coating liquid onto an object to be coated, said method comprising the steps of:
- providing a spray discharging system having an atomizer for atomizing said coating liquid, said atomizer having a rear end and a front end, said atomizer longitudinally extending from the rear end to the front end and towards the object, the front end of said atomizer having an external surface, an internal surface that defines an inner passage for the coating liquid, and an atomizing edge at the boundary of the internal and external surfaces:
- atomizing and spraying the coating liquid from the atomizing edge onto the object;
- and
- wetting the external surface of the front end of said atomizer in the vicinity of said atomizing edge by depositing an accessory liquid, either drop-wise or in the form of an aerosol, on said external surface in order to prevent or delay precipitation of the coating liquid on said external surface.
A spray system for coating an object with a coating liquid, said system comprising:
- a liquid atomizer for atomizing and spraying the coating liquid onto the object, said atomizer having longitudinally spaced rear and front end portions, the front end portion of said atomizer having an external surface, an internal surface that defines an inner passage for the coating liquid, and an atomizing edge at the boundary of the internal and external surfaces from which edge the coating liquid is to be dispensed as a spray;
- a wetting unit having at least one discharge aperture located outside said inner passage and adjacent to the external surface and the atomizing edge of the front end portion for depositing an accessory liquid on said external surface in the vicinity of the atomizing edge in order to prevent or delay precipitation of the coating liquid on said external surface;
- and
- a cooling unit having a coolant line fitted with at least one cooling medium outlet pointing at the rear end portion of said atomizer in order to deposit a cooling medium onto said atomizer, wherein the discharge aperture of said wetting unit and the cooling medium outlet of said cooling unit are longitudinally spaced from each other.
A spray system for coating an object with a coating liquid, said system comprising:
- spraying means for spraying the coating liquid onto the object, said means comprising a hollow front terminal from which the coating liquid is to be sprayed, said front terminal having an external surface, an internal surface that defines an inner passage for the coating liquid prior to being sprayed, and an edge at the boundary of the internal and external surfaces;
- and
- wetting means for spraying or dripping an accessory liquid on said external surface in the vicinity of said edge of the front terminal during the spraying operation of said spraying means in order to prevent or delay precipitation of the coating liquid on said external surface during the spraying operation.
A method of spraying a coating liquid onto an object to be coated, said method comprising the steps of:
- providing a spray discharging system having a front terminal facing the object;
- delivering the coating liquid to said spray discharging system;
- spraying the coating liquid from the front terminal onto the object;
- and
- wetting an external surface of the front terminal by depositing, in a metered manner, an accessory liquid on said external surface in order to prevent or delay precipitation of the coating liquid on said external surface;
- wherein said wetting is performed during said spraying.
Dependencies are inferred from the claim text.