square edges (board edges)

Board edges cut at right-angles to the inner and outer surfaces can be described as square, and this is typical of all paper boards (external bevelled edges of paper boards are largely a nineteenth-century phenomenon). Spine edges may have internal bevels to match the shape of the joints of the bookblock.

Rettskårne permkanter er typiske for pappermer, den innvendige ryggkanten kan være skredd for å tilpasses bokblokkens falser. Avfasing av pappen på permenes ytterkanter er et 1900-talls fenomen.