What are the types of spherical lens manufacturing methods？

There are two types of spherical lens manufacturing methods: first, the glass powder is heated to a molten state by high temperature gas, and the surface tension is used to form circular microbeads, powder method and calcination method; Or melt the glass mixture and blow it directly with high-speed air flow, and the glass droplets form round beads due to surface tension. Glass microbeads have the characteristics of good surface finish, good light reflection, directional reflection, high impact strength, chemical stability, light volume weight and so on.