Powder coating booth
AssigneesThe Fishing Group, The Andersons, Inc.
InventorJerome D. Orr
Life of this patent
Estimating the term…
Abstract
A powder coating booth and a recirculating air system is provided for electrostatic coating of articles. The booth includes an operator compartment and a spray chamber. A recirculating fan supplies air to the operator compartment which passes through a window into the spray chamber. The fan also provides air flow through orifice plates at the top of the spray chamber to surround the articles in a controlled manner. The fan additionally supplies air against the back wall of the spray chamber. All of the air in the spray chamber is passed through a reclamation filter and back to the fan. The entire system can be provided on a mobile base.
Claims16
A powder coating booth in which electrically charged coating particles are sprayed onto articles being conveyed through the booth, comprising in combination:
- a longitudinally extending spray chamber having front, back, top and bottom walls and ends through which the articles to be sprayed with coating particles are passed along a work path between said front and back walls;
- a recirculating air blower passing air downwardly through orifices in said top wall on both sides of said work path, and passing air downwardly through a longitudinally extending slot nozzle in said top wall to sweep against said back wall;
- an operator compartment having a common front wall with said spray chamber and also having back, top, bottom and end walls, said front wall having a window opening through which an operator sprays coating particles onto the articles passing along said work path;
- means for providing a lower air flow through a central zone encompassing the work path than both the air flow through a front zone between said central zone and said front wall and through a rear zone between said central zone and said back wall by sizing and spacing said orifices in said top wall, wherein the air flow through the central zone, front zone and rear zone produces a quiescent air envelope around the articles to be sprayed along said work path, thus maximizing transfer of coating particles to the articles being sprayed and, prevents any back spray from the spray chamber toward the operator compartment;
- said recirculating air blower passing air into said operator compartment through louvers in the top wall of said operator compartment adjacent the back wall of said operator compartment so that said air sweeps downwardly into said spray chamber through said window opening;
- an extraction hopper in the bottom wall of said spray chamber for collecting air passing through the top wall of said spray chamber and through said window opening along with coating particles not adhering to said articles;
- a filter receiving the air from said extraction hopper and removing the coating particles to produce clean air;
- and
- means passing the clean air from said cartridge filter to said recirculating air blower.
Dependencies are inferred from the claim text.