Method of making a reinforced composite panel of the cellular-core sandwich type, and a panel obtained by performing such a method

1. Field of the Invention The invention relates to a method of making a reinforced composite panel of the sandwich type having a cellular core. In the method: a stack is formed that is made up of: at least one first skin () made of a reinforced thermoplastics material; a first reinforcing ply () made of a reinforced thermoplastics material; a cellular core () made of a thermoplastics material; a second reinforcing ply () made of a reinforced thermoplastics material; and a second skin () made of a reinforced thermoplastics material; each of the first and second reinforcing plies () having a surface area that is smaller than the surface area of each of the first and second skins (), and said first and second reinforcing plies being positioned symmetrically about the plane formed by the cellular core at determined places against said skins; the stack is pre-assembled; the pre-assembled stack is heated in an oven; and said panel is formed by subjecting the heated stack to cold-pressing in a mold, under a pressure lying in the range 1×10Pa to 3×10Pa.