Process and device for manufacturing composite sections and similar products

In an extrusion device for manufacturing composite sections including at least a metal and two flat metal strips and comprising an entry plate, a mandrel plate and a die plate having a die opening defined therein with short and long axes, the improvement comprising:

• two substantially symmetrical feeding channels for feeding in said metal strips defined by at least some of said plates, said feeding channels extending through said mandrel plate and uniting unobstructedly thereby defining a passageway extending substantially parallel to said short axis at said die opening and opening into said die plate, whereby said metal and said metal strips are separate in said entry plate and said mandrel plate and contact each other in said die opening, wherein there is provided at least one region of curvature in said feeding channels to promote low friction.