Device for manufacturing a composite product

A device for manufacturing a composite product comprising:

• a first folded layer comprising a first and a second superposed portion extending from a respective first and second free end to a first bend connecting the first and the second superposed portions, and
• a second folded layer comprising a third and a fourth superposed portion extending from a respective third and fourth free end to a second bend connecting the third and the fourth superposed portions,
• wherein the first and second folded layers are laid adjacent to each other in order that the second portion of the first folded layer is in contact with the third portion of the second folded layer, the first and second folded layers being oriented with respect to each other in order to extend from a first side including the first, second, third and fourth free ends to a second side including the first and second bend, and
• wherein the first folded layer and second folded layer include a first roller and a second roller respectively between the first and the second superposed portions and between the third and the fourth superposed portions, respectively at the first and second bend.