Title: Gun for tribo charging powder

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Abstract: A gun for tribo charging powder has a barrel body with a bore having an opening at one end. A venturi forming tube is contained in the barrel bore and a supply of powder enters the barrel through a bore of the venturi forming tube, which is in alignment with the bore of the barrel, creating an obstruction free passageway for the powder. A supply of pressurized propellant gas enters the barrel bore through an area between the outer venturi forming tube wall and the inner barrel wall and is the power source for charging the powder. Modifications for increasing the charge imparted to the powder include an insert in the venturi forming tube bore for forcing the powder to travel closer to the barrel wall upon exiting the venturi forming tube bore, and a system of holes through the venturi forming tube wall for imparting swirling motion to the powder in the venturi forming tube bore. A modification for allowing a softer spray of powder from the gun includes a nonconductive barrel end having an outwardly flared bore.


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