Patent ID: 8864044

Claim:
A coating device, comprising: a paint supply line comprising a first tank which stores paint, a paint high-pressure pump which pressurizes a paint supplied from the tank to a prescribed pressure, and a paint primary pressure regulation valve which regulates a discharge pressure of the paint high-pressure pump and returns a paint surplus to the first tank; a carbon dioxide supply line comprising a second tank which stores liquid carbon dioxide, a cooler which cools the liquid carbon dioxide to a prescribed temperature, a liquid carbon dioxide high-pressure pump which pressurizes the liquid carbon dioxide supplied from the cooler to a prescribed pressure, and a liquid carbon dioxide primary pressure regulation valve which regulates a discharge pressure of the liquid carbon dioxide high-pressure pump and returns a carbon dioxide surplus to a suction of the liquid carbon dioxide high-pressure pump; and a paint/carbon dioxide mixture line comprising a mixer which mixes a pressurized paint supplied from the paint supply line and pressurized carbon dioxide supplied from the carbon dioxide supply line, and a spray gun which sprays a mixed paint/carbon dioxide pressurized mixture supplied from the mixer onto an object at atmospheric pressure, wherein the coating device employs carbon dioxide as a substitute for all or a portion of a diluent solvent (thinner) in an organic solvent-based spray coating.