Fluid sprinkling – spraying – and diffusing – With heating or cooling means for the system or system fluid – Heating means
Patent
1994-04-20
1995-12-26
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
With heating or cooling means for the system or system fluid
Heating means
2392885, 2393975, 239DIG14, 239290, B05B 124, B05B 1200
Patent
active
054780144
ABSTRACT:
A spray gun uses hot, high volume, low pressure (HVLP) air to atomize a coating material at a spray head of the gun. The coating material may be water-based adhesive or paint which may include a relatively small amount of solvent. The coating material may also be a high viscosity, solvent-based paint such as a polyester or urethane. The spray gun includes a plunger mechanism and a trigger which generate an air pressure control signal which opens a valve to allow the hot HVLP air to come to the front of the spray gun. Thermally insulated hot air hoses couple the spray gun to a source of hot air such as a heater conversion unit. Teflon tubes thermally insulate the coating material from the hot air as the coating material is received by the spray gun. A plastic shroud thermally insulates and concentrates a hot air coating material mixture during atomization of the coating material at a spray head of the spray gun. The hot air has a temperature in the range of 250.degree. F. to 350.degree. F. at the spray head so that a substantial portion of the base of the coating material is evaporated from the atomized coating material before coating an article. When the coating material is a water-based adhesive, the water-based adhesive dries in about the same amount of time that it takes for a solvent-based adhesive to dry in a conventional spray coating system.
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