Forming assembly for a dunnage conversion machine, dunnage conversion machine and pre-prepared sheet stock material

A forming assembly for a cushioning conversion machine, comprising:

• an internal forming device having
• a height dimension, a width dimension perpendicular to the height dimension, and a length dimension perpendicular to both the height dimension and the width dimension,
• a bottom surface, and a pair of laterally-spaced lengthwise-extending protrusions that protrude from a common side of the bottom surface,
• where the width dimension decreases from an upstream end to a downstream end spaced from the upstream end along the length dimension, and the height dimension of the protrusions increases from the upstream end to the downstream end such that the protrusions include wedge-shape volumes,
• where the wedge-shape volumes of the protrusions extend along converging axes, and the protrusions include a pair of laterally-spaced lengthwise-extending parallel ridges that are coextensive with and protrude above the wedge-shape volumes and are spaced inwardly from laterally-outer edges of the wedge-shape volumes.