Method for producing a connecting part, connecting part produced in accordance with the method, tool for producing such a connecting part and fastening system having such a connecting part

A method for producing a connecting part (3) using an injection molding process, wherein, in a first step, a fastening part (11) having adhesive and/or hooking elements (21, 23), said fastening part forming a component of a contact fastener, is produced, at least in part, from at least one synthetic material, and is introduced as an insertion part into an injection mold (27, 29), in which, in a second step, at least one additional synthetic material is introduced into the injection mold (27, 29) by means of a back injection process at a predefinable pressure and at a predefinable temperature to form a base body (9), said synthetic material being introduced in such a way that the respective additional synthetic material, at least in part, forms a common molten mass with the at least one synthetic material of the fastening part (11), after the cooling of which, the fastening part (11), together with the base body (9) firmly bonded thereto, form the connecting part (3) as an integrated composite component.