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Spray nozzle for two-component air-assisted, low pressure spray systems

Imported: 24 Feb '17 | Published: 09 Sep '03

Jack H. Hunter

USPTO - Utility Patents

Abstract

The present invention relates to a spray nozzle for a two-component, air-assisted, low pressure spray system including

a) a static mixer having an inlet port on its upstream end for receiving a first liquid component and a second liquid component that is reactive with the first liquid component and having on its downstream end an optionally removable spray tip for introducing the mixed liquid components into an atomizing zone,

b) a static mixer shroud, which encases the static mixer, is dimensioned on its upstream end for connecting the shroud to a dispensing unit for the first and second liquid components and has on its downstream end an optionally removable spray section having inlet ports for receiving pressurized air and outlet ports for introducing air into the atomizing zone, wherein the spray tip passes through an orifice in the spray section such that the mixed liquid components are introduced into the atomizing zone.

The present invention also relates to a process for spraying a two-component composition using the spray nozzle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 represents an exploded view of a preferred embodiment of the spray nozzle according to the invention.

FIG. 2 represents another embodiment of the shroud according to the invention.

FIG. 3 represents an embodiment of the spray nozzle connected to the component storage and dispensing unit.

FIG. 4 represents an enlarged view of the spray section of the spray nozzle.

Claims

1. A spray nozzle for a two-component, air-assisted, low pressure spray system comprising

2. The spray nozzle of claim 1 wherein said spray tip is removable.

3. The spray nozzle of claim 1 wherein said static mixer is a plastic static mixer.

4. The spray nozzle of claim 2 wherein said static mixer is a plastic static mixer.

5. The spray nozzle of claim 1 wherein said spray section is removable.

6. The spray nozzle of claim 2 wherein said spray section is removable.

7. The spray nozzle of claim 3 wherein said spray section is removable.

8. The spray nozzle of claim 4 wherein said spray section is removable.

9. The spray nozzle of claim 1 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

10. The spray nozzle of claim 2 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

11. The spray nozzle of claim 3 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

12. The spray nozzle of claim 4 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

13. The spray nozzle of claim 5 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

14. The spray nozzle of claim 6 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

15. The spray nozzle of claim 7 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

16. The spray nozzle of claim 8 wherein said shroud is dimensioned to be threadably connected its upstream end and its downstream end.

17. The spray nozzle of claim 1 wherein said static mixer tapers to form a spray tip.

18. A process for spraying a two-component composition which comprises

19. The process of claim 1 wherein said first component is a polyisocyanate and said second liquid component is a polyaspartate.