English to Spanish Tech/Engineering Patents fabricación de cajas de cartón

The ridges M1, M2, M3 and M4 are formed to be sandwiched between respective long sides of the top panel 3, the bottom panel 7 and the long side panels 5 and 9.

The ridges may be desirably formed in both sides of the top panel 3 or the both sides of the bottom panel 7. This is from the reason that if the ridge is formed exclusively in one side of the panel, there will be a possible imbalance in the absorption of deformation from the load.

Then, as the bending stress increases, the bending action propagates along the width toward the top panel 3 side within the rule. During that, since the thickness varies in steps within the K4, a resultant ridge M32 will appear to be bent and collapsed in such a cross section like a polygonal shape.