Direct in-line injection of particulate compositions in spraying systems

U.S. Patent Number: 5383611

Abstract: A method and apparatus for direct in-line injection of solid particulate compositions into conventional spraying systems, the apparatus including a screw designed to meter and reduce the particle size of the composition as it is transported from an inlet to an exit in the apparatus, the screw characterized by a constant depth portion adjacent to the inlet, air-tight seals at both the inlet and outlet end of the screw, and means for adjusting the longitudinal position of the screw.

Inventors: Falini; Jeffery P. (Bear, DE), Gaultney; Lawrence D. (Elkton, MD)

Assignee: E. I. du Pont de Nemours and Company (Wilmington, DE)

Application Number: 08/134,238

Issued: 1995-01-24

Expired: 2007-01-24

Classes: 241/30 ; 241/260.1

Field of search: 241/3,30,260.1,259

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