Electrostatic powder coating apparatus using a swirling flow...

Details Electrostatic powder coating apparatus using a swirling flow... Electrostatic powder coating apparatus using a swirling flow...

2005-07-05

2005-07-05

Scherbel, David A. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Electrostatic type

C239S690100, C427S459000, C427S475000

Reexamination Certificate

active

06913213

ABSTRACT:
An electrostatic powder coating apparatus including a housing with an interior coating area for receiving a workpiece. The interior coating area includes a vortex inducing surface and a pressurized air input device directs air against the surface to form a swirling pattern of air around the workpiece. A powder introducer directs charged powder into the swirling pattern of air and the powder is then electrostatically attracted to the workpiece. The powder introducer may be a powder fluidizing bed disposed in the housing or other suppliers, such as electrostatic powder spray guns. In alternative embodiments, vortex generators in the form of tubular structures connected proximate the housing inlet and outlet have tangential ports for introducing positive pressure air or inducing vacuum in the tubular structures. These also form a swirling pattern of air which may be used to produce or augment the swirling pattern in the coating area or used to collect excess powder while augmenting the coating at the inlet and outlet.

REFERENCES:
patent: 3598626 (1971-08-01), Probst et al.
patent: 3913523 (1975-10-01), Probst et al.
patent: 4606928 (1986-08-01), Dunford et al.
patent: 4808432 (1989-02-01), Hajek
patent: 5415113 (1995-05-01), Wheeler et al.
patent: 5773097 (1998-06-01), Rogari
patent: 6458427 (2002-10-01), Bertellotti et al.

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