A novel way to watch paint dry

摘要

It's often the first thing we notice about a vehicle, and it reveals a lot: how new (or not) the vehicle is, how it's been cared for, where it's been driven. "Consumers are extremely picky regarding the quality of the paint job on any car they purchase, new or old, and the 10- to 20-year appearance of a car depends on 10 to 20 critical minutes of application and drying," says James Gilchrist, a professor of chemical and biomolecular engineering at Lehigh University's RC. Rossin College of Engineering and Applied Science. Paint, however, is more complicated than you might think. If its formulation isn't right, instabilities can form unsightly pockmarks. It's also highly energy intensive to apply, accounting for 60 percent of the energy consumed by a single automotive plant, says Gilchrist. Manufacturers use robots to spray the paint, and that spraying takes place in rooms designed to contain and safely emit volatile organic compounds. When an application isn't done correctly, the vehicle must be recoated and touched up - a process that can cost a single plant more than $10 million per year.