Gloss is a physical property of the paint surface. When the paint surface is exposed to light, the light reflection ability in a certain direction is different due to the difference in the smoothness of the paint surface. The performance of light reflected in a certain direction is simply referred to as gloss. The general paint gloss can be divided into three types: shiny, semi-gloss and matt gloss. Light paint specifically means gloss above 40GU. The gloss of semi-gloss paints is generally between 20GU-40GU. A gloss of less than 10 GU is called a matt paint. This is divided according to the different requirements of the paint in the practical application of the gloss.
1.How does the automotive paint gloss meter work:
The automotive paint gloss meter consists of a light source and a receiver. The light emitted by the light source passes through the lens to become parallel light or the concentrated light beam is directed at the paint surface at an angle (the angle of the gloss meter, generally using a 60 degree angle gloss meter). The light emitted from the paint surface is reflected to the lens at the same angle for convergence. The photocell is absorbed by the photocell and the photocurrent is generated. Then, the energy reading of the galvanometer can be used to obtain the gloss reading. The amount of light flux received by the photocell depends on the reflectivity of the paint surface. At present, the standard angle of automotive paint gloss meter on the market mainly measures the specular gloss of paint at three angles of 20 degrees, 60 degrees and 85 degrees.
2.Classification of automotive paint gloss meters:
The automotive paint gloss meter is mainly divided into desktop and portable. The bench gloss meter is mainly composed of a probe and a host. It is mostly used in laboratories. Portable paint gloss meters can be used in the laboratory as well as in applications other than laboratories. Portable paint gloss meters can be divided into single angle and multiple angles.
3.Standard board for automotive paint gloss meter:
The standard board of the automotive paint gloss meter usually consists of two types: high gloss and low gloss. The high gloss standard board usually uses a highly polished black glass plate or a transparent glass plate with a back and edge frosted and black lacquer, mainly for calibration. . Low-gloss standard boards generally use ceramic plates mainly for checking whether the instrument works well and cannot be used for calibration. If the instrument reading of the low gloss panel exceeds the specified value by more than 1 GU, the instrument needs to be calibrated.