Coating processes – Spraying
Patent
1997-08-29
1999-11-02
Beck, Shrive
Coating processes
Spraying
239526, 239532, B05D 102
Patent
active
059766310
ABSTRACT:
A method for applying to a surface a viscous liquid having a low shear rate viscosity in the range from about 0.1 Pascal.seconds to about ten (10) Pascal.seconds at a shear rate of ten (10) per second, a shear-thinning power law index in the range from about 0.2 to about 0.6, a high shear rate viscosity in the range from about 0.05 Pascal.seconds to about 0.5 Pascal.seconds at a shear rate of twenty thousand (20,000) per second, and a surface tension in the range from about fifteen (15) dynes/cm. to about sixty (60) dynes/cm. is characterized by pressurizing the liquid to a static pressure in the range from about five hundred (500) pounds per square inch to about fourteen hundred (1400) pounds per square inch, and thereafter spraying the viscous liquid at a dynamic pressure in the range from about one hundred (100) pounds per square inch to about one thousand (1000) pounds per square inch, whereby the liquid emanates as a spray with substantially no mist through a spray tip of an applicator wand. The tip has an orifice size in the range from about 0.025 to about 0.065 inch.
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Barr Michael
Beck Shrive
E. I. Du Pont de Nemours and Company
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