The process for manufacturing ceiling tiles depends on what kind of tile it is. Some common types that Decorative Ceiling Tiles sells are made from a huge range of materials and styles. The different materials aren't all made in the same way.
Tin ceilings are a historic style, but the process of making them has changed a lot over the centuries. These days, 3D printers create a molded stamp with the ceiling tile design. A hydraulic press applies thousands of pounds of pressure into the tin to stamp the design into its surface. Many tiles have a similar look to tin ceilings, but they're made from different materials. They're still pressed with molded stamps, and sometimes the tin is embellished with something like a copper glaze or aluminum plating. Wood tiles are usually machine-tooled and carved, while PVC and other plastic materials are made by melting down the material and running it through a machine that presses it flat.