Final Report on the Development of a Standardized Test Protocol for Determiningthe Relative Transfer Efficiency of Spray Guns

摘要

This report describes the development of a Transfer Efficiency Test Protocolwhich can be used to evaluate the efficiency of a manual or automatic spray gun relative to a spray gun selected as a standard or baseline. This study focused on the six parameters considered to have the most effect on transfer efficiency: panel size, coating rheology (solvent-borne coatings), spray gun type, distance between the spray gun tip and the target (flat panels), spray gun design, and water-borne coating. The research demonstrated that the protocol will yield repeatable results, and can be sufficiently sensitive to differentiate between spray guns of different types and designs. Except with guns for which the efficiency differences are not significant, the work showed that the relative ranking of spray guns, when compared against each other, is perserved even when panel size and coating formulation are changed.