System for automatic electrostatic spray coating

US4771729A · kind A · utility

Assignee

• Ransburg Corporation · US

Inventors

• Albert Planert · Heusenstamm, DE
• Winfried Ott · Rodgau, DE
• Gunther Fleig · Hanau, DE

Key dates

• Filing date: Nov 1, 1985
• Grant date: Sep 20, 1988
• Expiry date: Nov 1, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05B12/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method and system are provided for dispensing only that amount of coating material which is required for coating a series of one or more articles to be coated by the coating material. The method and system include the step of, and apparatus for, feeding that amount of coating material to an intermediate container. The intermediate container receives the coating material from a color changer. The connection between color changer and intermediate container is so designed that no electrical current flow exists between these two components, even when using electrically conducting coating material. The coating material is electrostatically charged at an atomizer downstream from the intermediate container during a spray operation. When a coating material change is required, the amount of coating material dispensed into the intermediate container has essentially been exhausted, making it possible to clean the system components affected by the coating material change with very little waste and within a short time, so that the new coating material will not be contaminated by residue of the previously used coating material.