William G Rector

US Patent:

62733451, Aug 14, 2001

Filed:

Feb 11, 2000

Appl. No.:

9/505455

Inventors:

Raymond A. Kaligian - Geneva IL
James E. Messer - Westlake OH
Salvatore C. Immordino - Trevor WI
Michael J. Porter - Hanover Park IL
William G. Rector - McHenry IL
Timothy Ross - Kannapolis NC

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B05B 706

US Classification:

2394193

Abstract:

A slurry spray machine for spraying a settable slurry includes a main passageway configured for receiving a supply of pressurized slurry and having a supply end and an outlet end opposite the supply end. A first compressed gas inlet is disposed intermediate the supply and outlet ends and in fluid communication with the passageway for introducing a first supply of pressurized gas into the slurry, and a second pressurized gas inlet is disposed closer to the outlet end than the first inlet and in fluid communication with the passageway for introducing a second supply of pressurized gas into the slurry. A pressurized supply of adjuvant is provided in fluid communication with the second pressurized gas inlet for providing a blended gas to the second gas inlet. At least one valve is provided for controlling the flow of slurry through the passageway and the flow of the first and second gases into the passageway. Prior to the pressurized ejection of the slurry from the outlet end, the first gas is injected into the slurry, and the blended gas is mixed with the slurry and the first pressurized gas between the first gas inlet and the outlet end.