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US 2011/0265716 A1Published application
Powder coating systems
AssigneeNordson Corporation
InventorsJames Ainsworth, Louis Van Den Bergh, Luigi Perillo
Life of this patent
Estimating the term…
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AssigneeNordson Corporation
InventorsJames Ainsworth, Louis Van Den Bergh, Luigi Perillo
Estimating the term…
A powder spray booth (2) with a powder recovery system having an overspray intake (18) communicating with the interior of the booth. A vertically extending duct (20) leads from the overspray intake to a powder recovery system such as, for example, a cyclone. The vertically extending duct may have doors (32) opening to the interior of the booth to provide access to the vertical duct for cleaning. The doors may have holes (120) to aspirate air from the booth interior to optimize air flow patterns within the booth. A diverter plate (26) within the booth (2) defines with the booth floor (10) a floor duct leading to the overspray intake (18). The diverter plate has apertures for allowing oversprayed powder to be collected through the plate. The diverter plate may be provided as two or more diverter plates held at different elevation levels within the booth to define a floor duct which is larger in parts of the floor duct which are closer to the overspray intake than parts of the floor duct which are farther from the overspray intake. The coating system may include an air assist which provides jets of air across a portion of the interior surface of the booth. The surface may be one or more sloped portions (22) of the floor and/or one or more portions of the diverter plate. The air supply may be pulsed to produce periodic bursts of air across the interior surface.
1-37. (canceled)
A powder spray system comprising a powder spray booth having side walls and end walls and a floor, one or more powder spray devices positioned with respect to the side walls to spray articles passed through the booth via openings in the end walls, and a powder recovery system having an overspray intake communicating with the interior of the booth, the powder recovery system including suction means for drawing overspray powder from the booth interior into the overspray intake, an air assist device comprising a source of air, and at least one plenum with at least two air outlets that are arranged to discharge air such as to move oversprayed powder which has collected on the floor towards inlet ducts, the inlet ducts collecting oversprayed powder which has been blown into the ducts by the air assist device, with powder collected in the inlet ducts being drawn through the overspray intake into the powder recovery system, and control means for controlling the source of air, wherein the control means control the source of air to provide pulses of air through the at least two air outlets of the at least one plenum.
Dependencies are inferred from the claim text.