Variable low-pressure fluid color change cycle

Details Variable low-pressure fluid color change cycle Variable low-pressure fluid color change cycle

B - Operations, Transporting

05

B

32/4, 117/57

B05B 12/00 (2006.01) B05B 5/16 (2006.01) B05B 12/14 (2006.01)

Patent

CA 1165191

ABSTRACT A technique for changing cleanly and swiftly coating material colors being delivered to a paint spraying device is disclosed. The technique involves an improvement over the conventional "soft" air technique used in the automotive finishing industry in which air just above atmospheric pressure is used to push the last of a quantity of a given color from the delivery tube to the spray head. According to the invention the pressure of this "soft" air is varied according to the viscosity of the particular color being dispensed so that a constant delivery rate and coating thickness is maintained right up to the end of delivery of that particular color. A similar "soft" solvent technique is also disclosed.

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