Colors are changed periodically in an assembly facility. Between the application of different colors, solvents are used to clean the equipment and purge the paint system of the former color to prevent color cross-contamination. VOCs Finishing Pollution Prevention Options Process changes and product reformulations can help reduce the emission of volatile, sometimes toxic, chemicals. Simply stated, the term refers to painting many vehicles of the same color before changing colors. Block painting, by minimizing color changes, reduces the wastes generated during purging and cleaning the application equipment to accommodate color changes.
Transfer efficiency is a parameter that measures the performance of painting and coating operations.
By increasing the transfer efficiency of the application process, the consumption of paint is decreased. Methods that have been successfully employed to increase transfer efficiency include the use of electrostatic spray guns and the reconfiguration of vehicle body parts and spray guns. Electrostatic spray guns impart a charge to the paint particles. The electrically charged particles are attracted to the vehicle part, thus improving the transfer efficiency of the system. The reconfiguration of vehicle body parts and spray guns can also enhance transfer efficiency by increasing the amount of paint directed at the parts.