Method for manufacturing a composite product

1. A method for manufacturing a composite product comprising:

folding a first layer in order to create 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,

folding a second layer in order to create 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,

laying the first folded layer over a support surface with the first superposed portion in contact with the support surface,

laying the second folded layer over the first folded layer with the third superposed portion in contact with the second superposed portion of the first 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,

laying a plurality of fiber layers over the second folded layer and laying a cover surface over the plurality of fiber layers,

after laying the plurality of fiber layers, applying a vacuum in a volume between the cover surface and the second folded layer,

after applying the vacuum, moving an assembly comprising the first and second folded layers, the plurality of fiber layers, and the cover surface over a second support surface with the first superposed portion in contact with the second support surface, and

after moving the assembly, pulling the second free end of the first folded layer and the third free end of the second folded layer in order to extract the first and second folded layers from between the plurality of fiber layers and the second support surface in order to let the plurality of fiber layers and the second support surface contact each other.

2. The method according to claim 1 , wherein folding the first layer and second layer includes inserting a first plurality of rollers and a second plurality of rollers respectively between the first and the second superposed portions and between the third and the fourth superposed portions, the first plurality of rollers and the second plurality of rollers respectively comprising a first roller at the first bend and a second roller at the second bend.

3. The method according to claim 2 , wherein the rollers of the first plurality of rollers and of the second plurality of rollers are uniformly distributed along the first and second folded layers, respectively.

4. The method according to claim 1 , wherein folding the first layer and second layer includes inserting 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.

5. The method according to claim 1 , wherein the cover surface is a surface of a gastight membrane.

6. The method according to claim 1 , wherein one or the other of the first and second support surface is a surface of a mold.

7. The method according to claim 1 , wherein in the assembly comprising the first folded layer and the second folded layer, the second free end and the third free end protrudes with respect to first free end and the fourth free end.

8. The method according to claim 1 , further comprising fixing the first free end of the first folded layer and the fourth free end of the second folded layer, before pulling the second free end of the first folded layer and the third free end of the second folded layer.

9. A method for manufacturing a composite product comprising:

folding a first layer in order to create 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,

folding a second layer in order to create 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,

laying the first folded layer over a support surface with the first superposed portion in contact with the first support surface,

laying the second folded layer over the first folded layer with the third superposed portion in contact with the second superposed portion of the first 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,

laying a plurality of fiber layers over the second folded layer and laying a cover surface over the plurality of fiber layers, wherein the cover surface is a rigid surface of a structure or of a mold,

after laying the plurality of fiber layers, compressing the plurality of fiber layers via gravity,

after compressing, moving an assembly comprising the first and second folded layers, the plurality of fiber layers, and the cover surface over a second support surface with the first superposed portion in contact with the second support surface, and

after moving the assembly, pulling the second free end of the first folded layer and the third free end of the second folded layer in order to extract the first and second folded layers from between the plurality of fiber layers and the second support surface in order to let the plurality of fiber layers and the second support surface contact each other.