What is R angle on vacuum forming design?

The R angle in Vacuum Forming design refers to the radius of the corners or edges of a part or mold. It is the curved portion where the flat surface transitions into a rounded shape. The R angle is important in vacuum forming as it helps prevent stress concentration and material thinning in the corners during the forming process. It also aids in the release of the formed part from the mold. The specific value of the R angle depends on the material being formed, the thickness of the sheet, and the desired aesthetics and functionality of the final product.