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US 2003/0192472 A1Published application
Booth for coating objects with powder
AssigneeEisenmann Maschinenbau KG
InventorsErwin Hihn, Wolfgang Bezner
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AssigneeEisenmann Maschinenbau KG
InventorsErwin Hihn, Wolfgang Bezner
Estimating the term…
A booth for coating objects with powder, in particular for powder painting, comprises in a manner known per se a housing, in which there is situated at least one application device, with which powder can be applied to the objects. Situated in the upper region of the housing is an air plenum, which is fed with supply air via an inlet opening. The air plenum is closed off downwardly by a filter ceiling. In contrast to known filter ceilings, the one according to the invention is air-permeable in its marginal region only, while in its central region it consists of air-impermeable material. The supply air is thus introduced into the interior of the booth as a kind of “air curtain” which flows mainly along the side walls of the housing of the booth, entrains in the process stray excess powder which has not adhered to the objects to be coated, and supplies it to at least one extraction opening situated in the bottom of the booth. This extraction opening leads to a filter unit which, for its part, is connected to an extraction fan and in which the powder present in the air/powder mixture can be separated off and passed on for reuse. The effects achieved by the special design of the filter ceiling are that less turbulence forms in the coating region, no particles falling off from the filter ceiling can lead to coating defects and, on changing the filters contained in the filter ceiling, there is less fouling of the booth.
Booth for coating objects with powder, in particular for powder painting, having
Dependencies are inferred from the claim text.
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For use in spray booths: by filtering the air charged with excess material
Spray booths: ventilation arrangements specially adapted therefor
Climate change mitigation technologies in the production process for final industrial or consumer products: greenhouse gas [GHG] capture, material…
Spraying apparatus
Term end not estimated
The invention relates to a booth for coating objects with powder, in particular for powder painting, having
a) a housing, in the upper region of which there is formed an air plenum which can be charged with supply air via an inlet and is bounded downwardly by a filter ceiling;
b) at least one application device in the housing, with which device powder can be applied to the objects; and
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing:
FIG. 1 Schematically shows a powder painting booth.
The powder painting booth is provided, as a whole, with the reference numeral 4 in the drawing. It comprises a substantially cuboid-shaped housing 3 with closable doors (not illustrated in the drawing) which are provided in the end faces 6 and via which the objects 7 to be coated are brought into the interior of the housing 3 and moved out of the housing 3 again with the aid of a conveying system (not illustrated). In the opposite side walls 9, 10 of the housing 3 which run parallel to the conveying direction, there are provided openings through which application devices 13, 14 project into the interior of the housing 3. The application devices 13, 14 deliver the coating powder to the objects 7 to be coated while the latter are moving or during stationary periods.
To remove the excess powder which is not deposited on the objects 7, an air flow, indicated by arrows, is maintained in the interior of the housing 3 of the powder painting booth 4. This air flow starts at the top in an air plenum 17, which is fed with supply air via an inlet opening 15 in the upper side 16 of the housing 3. The air plenum 17 is bounded downwardly by a filter ceiling 18. The filter ceiling 18 has a marginal region 18a which extends along the walls 6, 9, 10 of the housing 3 and in which there is arranged in a known manner filter material, via which the supply air can leave the air plenum 17. In contrast, the central region 18b of the filter ceiling 18 consists of non-conductive plastic and is air-impermeable.
The effect achieved by the described design of the filter ceiling 18 is that the supply air leaves the air plenum 17 in the direction of the interior of the housing 3 located therebelow not as an air stream covering the whole area but merely in the form of a kind of “air curtain” extending substantially along the walls 6, 9, 10 of the powder booth 4. The central, air-impermeable region 18b, in contrast, substantially covers the objects 7. The latter are therefore not subjected to a frontal flow against their upper side. Since the central region 18b of the filter ceiling 18 consists of non-conductive material, the powder particles, which are electrically charged in the application devices 13, 14 for coating purposes, do not tend to be deposited in this central region 18b of the filter ceiling 18. There is thus also no risk of particles falling off from this central region 18b onto the possibly freshly coated objects 7 situated directly therebelow.