Fold construction of corrugated fiberboard

A corrugated fiberboard sheet having a longitudinal dimension, a transverse dimension and a thickness, comprising:

• an intermediate layer with flutes extending along the longitudinal dimension of the corrugated fiberboard;
• first V-shaped fold lines in one surface of the transverse dimension of the fiberboard sheet and across the flutes at an angle;
• a series of separate linear slits in each of said first fold lines penetrating the corrugted fiberboard sheet, in each of said first fold lines said slits alternating and aligned with, in a straight line, uncut portions of said first fold lines, said uncut portions serving as hinges for bending the corrugted fiberboard sheet at said first fold lines;
• and
• linear auxiliary cuts joined at an angle to each of opposing ends of each of said slits, each of said auxiliary cuts forming, in cooperation with a joined slit, an one-sided arrow directed toward an adjacent hinge, each of said ends of said slits having only a single auxiliary cut which extends only in a single direction in the longitudinal dimension and in an opposite direction, along the transverse dimension, from the auxiliary cut on the other end of said slit