The size and frequency of surface structure on a substrate can have an intended or unintended effect on the quality of a coating’s gloss. Orange peel, named after its appearance, can develop from many factors, including substrate, but most commonly is a result of technique. Different texture problems are commonly described by the waviness, wavelength and the visual effects they have on the coating’s gloss. The smallest textures result in gloss reduction, while larger textures can result in visible ripples on the coated surface – such as orange peel. Understanding the development of these textures and their relation to substrates and techniques is critical to quality control.
Unlike traditional 2D instruments used to measure texture, 3D non-contact measurement provides a quick 3D image to better visually understand the surface characteristics, and offers the ability to quickly investigate areas of interest. Without speed and 3D review, a quality control environment relies solely on 2D information that gives little overall predictability of the entire surface. Understanding texture in 3D allows for the best selection of processing and control measures. Assuring the quality control of such parameters will rely heavily upon quantifiable, reproducible and reliable inspection. Nanovea 3D non-contact profilometers utilize chromatic confocal technology with the unique capability to measure the steep angles found during faster measurement. The profilometers are designed with leading-edge optical pens using superior white light axial chromatism. Other techniques fail to provide reliable data, due to probe contact, surface variation, angle or reflectivity.