Moving filter system for air-powder separation in an electrostat

Details Moving filter system for air-powder separation in an electrostat Moving filter system for air-powder separation in an electrostat

1977-04-07

1979-05-08

Mackey, Robert

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Electrostatic and/or electromagnetic attraction or...

55290, 55351, 98115SB, B05B 502, B01D 4622

Patent

active

041530080

ABSTRACT:
An electrostatic powder coating installation is disclosed, incorporating a spray booth in which there are arranged electrostatically charged powder spraying means whereby the powder spray means may apply a coating of said powder to an article. One portion of the internal walls of the spray booth is provided with a filter which is movable through the booth to a cleaning position outside the booth. The movable filter is arranged within the booth so that one face thereof is exposed to the interior of the booth and the opposite face thereof confronts the intake side of a suction device which is effective through the filter to maintain a slightly negative pressure within the booth. The overspray of powder directed at the article will therefore be attracted to and deposited on the exposed face of the movable filter. In accordance with the invention, the filter comprises a first or filter layer facing the booth interior to form the exposed face of the movable filter and a second or support layer underlying and co-extensive with the first layer to provide a firm filter construction. At the cleaning position, a cleaning device is operatively associated with said filter layer to remove the overspray deposited thereon. Additional means are also provided at the cleaning station to separate the support layer from the filter layer whereby friction between the filter layer and the cleaning device is greatly reduced to extend the useable life of said movable filter.

REFERENCES:
patent: 1222751 (1917-04-01), Frohrieb
patent: 2034784 (1936-03-01), Wallny
patent: 3918641 (1975-11-01), Lehmann et al.

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