There are a variety of ways to achieve bumped and indented metal surfaces. Embossing is performed while the thin metal is still in coil or sheet form. Embossing imparts a texture by passing smooth, thin-gauge metal through engraving rolls, which press a pattern into the metal surface. Embossing stiffens the metal surface, reducing the "oil canning" tendencies of the thin sheet. The embossing rolls flatten the metal for further roll forming into corrugated panel shapes or for forming flat sheets into sheet metal configurations.
Hiding Surface Imperfections with Embossed Metal
Another reason why embossed metal is selected is to hide surface imperfections. When metal comes off of a mill, it will often have surface imperfections or light scratching. A densely embossed metal surface will hide surface scratches due to its metal texture.
Metal embossing solves several problems at once: you can save money by reducing the material thickness, add rigidity to your surface, and develop a unique aesthetic, all on a metal panel which fits into standard attachment systems.