All kinds of raw materials based on silicate glass are sintered to form glass sand. After remelting at a high temperature of more than 1200 degrees, the glass sand is cooled instantaneously. Under the action of surface tension, the glass slurry condenses into microspheres with high refractive index. The glass microspheres are distributed horizontally and uniformly in the carrier. After several times of precise coating, composite and vapor deposition, various glass powders can complete the micro bead type retroreflective material Gorgeous turn.
The refractive index of glass beads is usually more than 1.9. The refractive index of glass beads used for road markings is relatively low, only about 1.5, which is equivalent to ordinary glass. This is also the reason why the markings are not bright enough ｏｒ not bright under the condition of flooding. For different product structures, different refractive index microspheres will be selected. Its particle size is usually 28-110um, and the middle diameter is about 1 / 2 of that of human hair.
Retroreflective materials can be basically divided into these four categories according to their uses: advertising consumables, liquid crystal display, traffic safety protection and personal safety protection. In the field of liquid crystal display, the optical properties and security fields pursued by them are different.