Method for producing a composite part made from aqueous resin and composite part coming from such a method

A method for manufacturing a structural composite part, said method comprising the following steps:

• a stacking step for stacking, in a heated mold, a first mat, a spacer and a second mat, the spacer being positioned between the first and the second mat;
• at least one of the first and second mats including a continuous web of fibers impregnated with a composition including a thermosetting resin, said web comprising a plurality of parallel fibers bound together by the composition;
• and
• a compression and heating step for compressing and heating the stack with the heated mold, the heating being performed at a temperature and for a duration allowing polymerization or cross-linking of the thermosetting resin;
• wherein:
• the stacking step includes the positioning, in the heated mold, of a first and a second filtering layers, the first and the second filtering layers being respectively positioned in contact with the first and the second mats, on the side opposite to the spacer;
• the first and the second filtering layers being porous to steam and relatively less porous to the thermosetting resin;
• and
• the heated mold includes means for removing steam formed during the compression and heating step.