Electrostatic powder spray coating system for car bodies
AssigneeGema Volstatic AG
InventorsDaniel Seiler, Heinz Hofler
Life of this patent
Estimating the term…
Abstract
An electrostatic powder spray coating system for car bodies is disclosed. Above the car bodies (14) are moved through the cabin and from which the spray organs (94) are supplied with powder. The powder container (92) is supplied with fresh powder and recycled powder from a supply container (36). Short paths between the powder container and spray organs allow precise metering and therefore a good coating quality. The spray coating is applied within an arrangement of inner and outer cabins which allows pressurizing of space between the cabins to prevent ingress of atmospheric air into and egress of powder out of the system.
Claims20
An electrostatic powder spray coating system for electrostatically spray coating articles, comprising:
- a spray coating cabin;
- means for transporting articles-to-be-spray-coated through said cabin in a longitudinal direction of said cabin;
- an outer cabin spaced from said spray coating cabin along longitudinal sides of said spray coating cabin and along a roof portion of said spray coating cabin;
- electrostatic powder spray coating means, disposed within spaces defined between said outer cabin and said spray coating cabin and extending through said longitudinal sides and said roof portion of said spray coating cabin, for electrostatically charging said powder to an electrical potential which is different than the electrical potential of said articles-to-be-spray-coated and for electrostatically spray-coating said articles-to-be-spray-coated with said electrostatically charged powder;
- a source of said powder fluidically connected to said electrostatic powder spray coating means for supplying said powder to said electrostatic powder spray coating means;
- and
- means for recovering excess powder from said spray coating cabin and for conveying said recovered excess powder to said source of said powder for reuse within said electrostatic powder spray coating means.
An electrostatic powder spray coating system for electrostatically spray coating articles, comprising:
- a spray coating cabin;
- means for transporting articles-to-be-spray-coated through said cabin in a longitudinal direction of said cabin;
- an outer cabin spaced from said spray coating cabin along longitudinal sides of said spray coating cabin and along a roof portion of said spray coating cabin;
- electrostatic powder spray coating means, disposed within spaces defined between said outer cabin and said spray coating cabin and extending through said longitudinal sides and said roof portion of said spray coating cabin, for electrostatically charging said powder to an electrical potential which is different from the electrical potential of said article-to-be-spray-coated and for electrostatically spray-coating said articles-to-be-spray-coated with said electrostatically charged powder;
- a source of said powder fluidically connected to said electrostatic powder spray coating means for supplying said powder to said electrostatic powder spray coating means;
- at least one endless filter belt, permeable to air but substantially impermeable to said powder, disposed within a bottom portion of said spray coating cabin for collecting excess powder disposed within said spray coating cabin;
- and
- means operatively associated with said at least one endless filter belt for recovering said excess powder accumulated upon said at least one endless filter belt and for conveying said recovered excess powder to said source of said powder for reuse within said electrostatic powder spray coating means.
Dependencies are inferred from the claim text.