Corrugating roller

A corrugating roller configured to, in operation, corrugate paper materials, the corrugating roller comprising:

• a first end and a second end opposite to the first end;
• an outer surface extends from the first end to the second end, around a circumference, and in a direction parallel to a central rotational axis of the roller;
• a first group of flutes at the outer surface and configured to, in operation, corrugate paper materials, the first group of flutes extends inward from the first end towards the second end along and parallel to the central rotational axis, the first group of flutes terminate before reaching the second end, the first group of flutes having third ends;
• a second group of flutes at the outer surface and configured to, in operation, corrugate paper materials, the second group of flutes offset relative to the first group of flutes, the second group of flutes extends inward from the second end towards the first end along and parallel to the central rotational axis, the second group of flutes terminates before reaching the first group of flutes, the second group of flutes having fourth ends;
• and
• a third group of flutes extends from the third ends to the fourth ends and configured to, in operation, corrugate paper materials, the third group of flutes is transverse to the first group of flutes and is transverse to the second group of flutes, and the third group of flutes separate and space apart the first group of flutes from the second group of flutes, and
• wherein the first group of flutes and the second group of flutes form two groups of offset flutes along the central rotational axis,
• wherein the first group of flutes includes a plurality of first peaks and a plurality of first valleys, the second group of flutes includes a plurality of second peaks and a plurality of second valleys, the third group of flutes includes a plurality of third peaks and a plurality of third valleys, each respective first peak of the plurality of first peaks is horizontally aligned with a corresponding second valley of the plurality of second valleys in the direction parallel to the central rotational axis, each respective second peak of the plurality of second peaks is horizontally aligned with a corresponding first valley of the plurality of first valleys in the direction parallel to the central rotational axis, and each respective third peak of the plurality of third peaks is aligned with and extended from a first peak of the plurality of first peaks and is aligned with and extended from a corresponding second peak of the plurality of second peaks, and
• wherein the first group of flutes are parallel with the second group of flutes.