Installation for powder-coating work pieces
AssigneeJ. Wagner GmbH
InventorWilly Huber
Life of this patent
Estimating the term…
Abstract
A powder spray chamber balances the downward forces of gravity on the coating particles with upward exhaust forces to suspend the coating materials adjacent the work piece for a longer period of time than would otherwise be possible.
Claims8
An improved installation for powder-coating a work piece, including an enclosed spray chamber adapted to temporarily receive the work piece to be coated, at least one spray device for delivering powdery coating material to the work piece and an exhaust line connected between an exhaust system including an exhaust means and the spray chamber, said improvement comprising at least one evacuation opening provided in an upper area of the spray chamber in a region above the work piece to be coated, at least one evacuation channel means formed in the chamber above the work piece, said evacuation channel means connected to the exhaust line through the opening, replaceable filter means positioned between the spray chamber and said evacuation openings, deflection means in the form of an intermediate ceiling positioned in the spray chamber above the work piece to be coated and below said replaceable filter means and adapted to keep excess coating powder from falling from the top of the spray chamber or said filter means onto the work piece, said deflection means together with the side walls of the spray chamber form said exhaust channels through which powder and gas to be exhausted flow in response to forces generated by said exhaust means, said deflection means being planar and sloping towards the sidewalls of the spray chamber, and further vertical planar members affixed to end regions of said planar deflection means adjacent to and spaced apart from the sidewalls of the spray chamber.
In a method for coating a work piece suspended in a chamber which is in turn connected to an exhaust system having the step of
- spraying a cloud of coating material toward the work piece,
- improvement steps comprising:
- generating upwardly oriented forces by using the exhaust system to partly evacuate an upper end of the chamber;
- balancing the downwardly oriented force of gravity exerted on each particle of coating material by means of the upwardly oriented forces such that each particle of coating material in the cloud is suspended for a selected period of time in the vicinity of the work piece;
- depositing a coating of material from the cloud onto the work piece;
- removing a portion of the residual non-deposited coating material from the top of the chamber through the exhaust system;
- removing any remaining suspended and non-deposited non-coating material through the floor of the chamber so that it may be recirculated and used again;
- filtering the portion of residual non-deposited coating material being removed from the chamber through the exhaust system as that portion is leaving the chamber;
- and
- deflecting residual non-deposited coating material being removed from the chamber by said exhaust system from falling onto the work piece.
In a spray chamber for applying a coating of material to a work piece, the spray chamber essentially encloses a region wherein the work piece is suspended and has a ceiling and a floor, an exhaust system is connectable to the chamber, an improvement comprising:
- at least a first chamber formed in the ceiling and connectable to the exhaust system;
- replaceable means for filtering positioned in said first chamber formed in the ceiling;
- means for deflection positioned between said means for filtering and the work piece;
- and wherein said floor slopes downwardly to form a centralized material removal opening;
- said means for deflection comprises at least one planar member positioned between the
- work piece and said replaceable flat filter, said planar member is adapted to deflect any particles of material that fall from said filter toward the work piece;
- and
- an essentially vertical planar member affixed to an end of said planar deflection member adjacent a sidewall of the spray chamber.
Dependencies are inferred from the claim text.