High yield spray application

Details High yield spray application High yield spray application

2006-01-19

2010-11-30

Cleveland, Michael (Department: 1712)

Coating processes

Applying superposed diverse coating or coating a coated base

Settable inorganic coating

C427S402000, C427S421100, C427S427000, C427S373000, C239S001000, C239S071000, C239S075000, C239S419000

Reexamination Certificate

active

07842348

ABSTRACT:
Method and device for ensuring high yields during spraying of a settable slurry composition. The slurry is conveyed through a length of hose to a nozzle spray-orifice, and a set accelerator is introduced into the slurry at a distance “D” from the nozzle spray-orifice. The level of accelerator is monitored using a sensor located in the slurry path at a point after the set accelerator is injected. A preferred sensor comprises two pairs of conductivity sensors each having an annular body with a bore corresponding to the diameter of the hose or nozzle bore. Voltage of the slurry can be correlated to yields obtained when a salt-based accelerator fluid is injected into the slurry, such that levels of accelerator can be finely adjusted, and consistently high yields of spray coatings can be achieved.

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